diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 2532 |
1 files changed, 2532 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c new file mode 100644 index 000000000000..d0c65610ebb5 --- /dev/null +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c @@ -0,0 +1,2532 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Cadence MHDP8546 DP bridge driver. + * + * Copyright (C) 2020 Cadence Design Systems, Inc. + * + * Authors: Quentin Schulz <quentin.schulz@free-electrons.com> + * Swapnil Jakhade <sjakhade@cadence.com> + * Yuti Amonkar <yamonkar@cadence.com> + * Tomi Valkeinen <tomi.valkeinen@ti.com> + * Jyri Sarha <jsarha@ti.com> + * + * TODO: + * - Implement optimized mailbox communication using mailbox interrupts + * - Add support for power management + * - Add support for features like audio, MST and fast link training + * - Implement request_fw_cancel to handle HW_STATE + * - Fix asynchronous loading of firmware implementation + * - Add DRM helper function for cdns_mhdp_lower_link_rate + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/firmware.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/phy/phy.h> +#include <linux/phy/phy-dp.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/wait.h> + +#include <drm/drm_atomic.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_atomic_state_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_connector.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_dp_helper.h> +#include <drm/drm_modeset_helper_vtables.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> + +#include <asm/unaligned.h> + +#include "cdns-mhdp8546-core.h" + +#include "cdns-mhdp8546-j721e.h" + +static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp) +{ + int ret, empty; + + WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex)); + + ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_EMPTY, + empty, !empty, MAILBOX_RETRY_US, + MAILBOX_TIMEOUT_US); + if (ret < 0) + return ret; + + return readl(mhdp->regs + CDNS_MAILBOX_RX_DATA) & 0xff; +} + +static int cdns_mhdp_mailbox_write(struct cdns_mhdp_device *mhdp, u8 val) +{ + int ret, full; + + WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex)); + + ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_FULL, + full, !full, MAILBOX_RETRY_US, + MAILBOX_TIMEOUT_US); + if (ret < 0) + return ret; + + writel(val, mhdp->regs + CDNS_MAILBOX_TX_DATA); + + return 0; +} + +static int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_device *mhdp, + u8 module_id, u8 opcode, + u16 req_size) +{ + u32 mbox_size, i; + u8 header[4]; + int ret; + + /* read the header of the message */ + for (i = 0; i < sizeof(header); i++) { + ret = cdns_mhdp_mailbox_read(mhdp); + if (ret < 0) + return ret; + + header[i] = ret; + } + + mbox_size = get_unaligned_be16(header + 2); + + if (opcode != header[0] || module_id != header[1] || + req_size != mbox_size) { + /* + * If the message in mailbox is not what we want, we need to + * clear the mailbox by reading its contents. + */ + for (i = 0; i < mbox_size; i++) + if (cdns_mhdp_mailbox_read(mhdp) < 0) + break; + + return -EINVAL; + } + + return 0; +} + +static int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_device *mhdp, + u8 *buff, u16 buff_size) +{ + u32 i; + int ret; + + for (i = 0; i < buff_size; i++) { + ret = cdns_mhdp_mailbox_read(mhdp); + if (ret < 0) + return ret; + + buff[i] = ret; + } + + return 0; +} + +static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id, + u8 opcode, u16 size, u8 *message) +{ + u8 header[4]; + int ret, i; + + header[0] = opcode; + header[1] = module_id; + put_unaligned_be16(size, header + 2); + + for (i = 0; i < sizeof(header); i++) { + ret = cdns_mhdp_mailbox_write(mhdp, header[i]); + if (ret) + return ret; + } + + for (i = 0; i < size; i++) { + ret = cdns_mhdp_mailbox_write(mhdp, message[i]); + if (ret) + return ret; + } + + return 0; +} + +static +int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value) +{ + u8 msg[4], resp[8]; + int ret; + + put_unaligned_be32(addr, msg); + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL, + GENERAL_REGISTER_READ, + sizeof(msg), msg); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_GENERAL, + GENERAL_REGISTER_READ, + sizeof(resp)); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, resp, sizeof(resp)); + if (ret) + goto out; + + /* Returned address value should be the same as requested */ + if (memcmp(msg, resp, sizeof(msg))) { + ret = -EINVAL; + goto out; + } + + *value = get_unaligned_be32(resp + 4); + +out: + mutex_unlock(&mhdp->mbox_mutex); + if (ret) { + dev_err(mhdp->dev, "Failed to read register\n"); + *value = 0; + } + + return ret; +} + +static +int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val) +{ + u8 msg[6]; + int ret; + + put_unaligned_be16(addr, msg); + put_unaligned_be32(val, msg + 2); + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_WRITE_REGISTER, sizeof(msg), msg); + + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static +int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr, + u8 start_bit, u8 bits_no, u32 val) +{ + u8 field[8]; + int ret; + + put_unaligned_be16(addr, field); + field[2] = start_bit; + field[3] = bits_no; + put_unaligned_be32(val, field + 4); + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_WRITE_FIELD, sizeof(field), field); + + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static +int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp, + u32 addr, u8 *data, u16 len) +{ + u8 msg[5], reg[5]; + int ret; + + put_unaligned_be16(len, msg); + put_unaligned_be24(addr, msg + 2); + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_READ_DPCD, sizeof(msg), msg); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, + DPTX_READ_DPCD, + sizeof(reg) + len); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg)); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, data, len); + +out: + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static +int cdns_mhdp_dpcd_write(struct cdns_mhdp_device *mhdp, u32 addr, u8 value) +{ + u8 msg[6], reg[5]; + int ret; + + put_unaligned_be16(1, msg); + put_unaligned_be24(addr, msg + 2); + msg[5] = value; + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_WRITE_DPCD, sizeof(msg), msg); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, + DPTX_WRITE_DPCD, sizeof(reg)); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg)); + if (ret) + goto out; + + if (addr != get_unaligned_be24(reg + 2)) + ret = -EINVAL; + +out: + mutex_unlock(&mhdp->mbox_mutex); + + if (ret) + dev_err(mhdp->dev, "dpcd write failed: %d\n", ret); + return ret; +} + +static +int cdns_mhdp_set_firmware_active(struct cdns_mhdp_device *mhdp, bool enable) +{ + u8 msg[5]; + int ret, i; + + msg[0] = GENERAL_MAIN_CONTROL; + msg[1] = MB_MODULE_ID_GENERAL; + msg[2] = 0; + msg[3] = 1; + msg[4] = enable ? FW_ACTIVE : FW_STANDBY; + + mutex_lock(&mhdp->mbox_mutex); + + for (i = 0; i < sizeof(msg); i++) { + ret = cdns_mhdp_mailbox_write(mhdp, msg[i]); + if (ret) + goto out; + } + + /* read the firmware state */ + ret = cdns_mhdp_mailbox_recv_data(mhdp, msg, sizeof(msg)); + if (ret) + goto out; + + ret = 0; + +out: + mutex_unlock(&mhdp->mbox_mutex); + + if (ret < 0) + dev_err(mhdp->dev, "set firmware active failed\n"); + return ret; +} + +static +int cdns_mhdp_get_hpd_status(struct cdns_mhdp_device *mhdp) +{ + u8 status; + int ret; + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_HPD_STATE, 0, NULL); + if (ret) + goto err_get_hpd; + + ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, + DPTX_HPD_STATE, + sizeof(status)); + if (ret) + goto err_get_hpd; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, &status, sizeof(status)); + if (ret) + goto err_get_hpd; + + mutex_unlock(&mhdp->mbox_mutex); + + dev_dbg(mhdp->dev, "%s: HPD %splugged\n", __func__, + status ? "" : "un"); + + return status; + +err_get_hpd: + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static +int cdns_mhdp_get_edid_block(void *data, u8 *edid, + unsigned int block, size_t length) +{ + struct cdns_mhdp_device *mhdp = data; + u8 msg[2], reg[2], i; + int ret; + + mutex_lock(&mhdp->mbox_mutex); + + for (i = 0; i < 4; i++) { + msg[0] = block / 2; + msg[1] = block % 2; + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_GET_EDID, sizeof(msg), msg); + if (ret) + continue; + + ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, + DPTX_GET_EDID, + sizeof(reg) + length); + if (ret) + continue; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg)); + if (ret) + continue; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, edid, length); + if (ret) + continue; + + if (reg[0] == length && reg[1] == block / 2) + break; + } + + mutex_unlock(&mhdp->mbox_mutex); + + if (ret) + dev_err(mhdp->dev, "get block[%d] edid failed: %d\n", + block, ret); + + return ret; +} + +static +int cdns_mhdp_read_hpd_event(struct cdns_mhdp_device *mhdp) +{ + u8 event = 0; + int ret; + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_READ_EVENT, 0, NULL); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, + DPTX_READ_EVENT, sizeof(event)); + if (ret < 0) + goto out; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, &event, sizeof(event)); +out: + mutex_unlock(&mhdp->mbox_mutex); + + if (ret < 0) + return ret; + + dev_dbg(mhdp->dev, "%s: %s%s%s%s\n", __func__, + (event & DPTX_READ_EVENT_HPD_TO_HIGH) ? "TO_HIGH " : "", + (event & DPTX_READ_EVENT_HPD_TO_LOW) ? "TO_LOW " : "", + (event & DPTX_READ_EVENT_HPD_PULSE) ? "PULSE " : "", + (event & DPTX_READ_EVENT_HPD_STATE) ? "HPD_STATE " : ""); + + return event; +} + +static +int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, unsigned int nlanes, + unsigned int udelay, const u8 *lanes_data, + u8 link_status[DP_LINK_STATUS_SIZE]) +{ + u8 payload[7]; + u8 hdr[5]; /* For DPCD read response header */ + u32 addr; + int ret; + + if (nlanes != 4 && nlanes != 2 && nlanes != 1) { + dev_err(mhdp->dev, "invalid number of lanes: %u\n", nlanes); + ret = -EINVAL; + goto out; + } + + payload[0] = nlanes; + put_unaligned_be16(udelay, payload + 1); + memcpy(payload + 3, lanes_data, nlanes); + + mutex_lock(&mhdp->mbox_mutex); + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_ADJUST_LT, + sizeof(payload), payload); + if (ret) + goto out; + + /* Yes, read the DPCD read command response */ + ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, + DPTX_READ_DPCD, + sizeof(hdr) + DP_LINK_STATUS_SIZE); + if (ret) + goto out; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, hdr, sizeof(hdr)); + if (ret) + goto out; + + addr = get_unaligned_be24(hdr + 2); + if (addr != DP_LANE0_1_STATUS) + goto out; + + ret = cdns_mhdp_mailbox_recv_data(mhdp, link_status, + DP_LINK_STATUS_SIZE); + +out: + mutex_unlock(&mhdp->mbox_mutex); + + if (ret) + dev_err(mhdp->dev, "Failed to adjust Link Training.\n"); + + return ret; +} + +/** + * cdns_mhdp_link_power_up() - power up a DisplayPort link + * @aux: DisplayPort AUX channel + * @link: pointer to a structure containing the link configuration + * + * Returns 0 on success or a negative error code on failure. + */ +static +int cdns_mhdp_link_power_up(struct drm_dp_aux *aux, struct cdns_mhdp_link *link) +{ + u8 value; + int err; + + /* DP_SET_POWER register is only available on DPCD v1.1 and later */ + if (link->revision < 0x11) + return 0; + + err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); + if (err < 0) + return err; + + value &= ~DP_SET_POWER_MASK; + value |= DP_SET_POWER_D0; + + err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); + if (err < 0) + return err; + + /* + * According to the DP 1.1 specification, a "Sink Device must exit the + * power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink + * Control Field" (register 0x600). + */ + usleep_range(1000, 2000); + + return 0; +} + +/** + * cdns_mhdp_link_power_down() - power down a DisplayPort link + * @aux: DisplayPort AUX channel + * @link: pointer to a structure containing the link configuration + * + * Returns 0 on success or a negative error code on failure. + */ +static +int cdns_mhdp_link_power_down(struct drm_dp_aux *aux, + struct cdns_mhdp_link *link) +{ + u8 value; + int err; + + /* DP_SET_POWER register is only available on DPCD v1.1 and later */ + if (link->revision < 0x11) + return 0; + + err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); + if (err < 0) + return err; + + value &= ~DP_SET_POWER_MASK; + value |= DP_SET_POWER_D3; + + err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); + if (err < 0) + return err; + + return 0; +} + +/** + * cdns_mhdp_link_configure() - configure a DisplayPort link + * @aux: DisplayPort AUX channel + * @link: pointer to a structure containing the link configuration + * + * Returns 0 on success or a negative error code on failure. + */ +static +int cdns_mhdp_link_configure(struct drm_dp_aux *aux, + struct cdns_mhdp_link *link) +{ + u8 values[2]; + int err; + + values[0] = drm_dp_link_rate_to_bw_code(link->rate); + values[1] = link->num_lanes; + + if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING) + values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; + + err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values)); + if (err < 0) + return err; + + return 0; +} + +static unsigned int cdns_mhdp_max_link_rate(struct cdns_mhdp_device *mhdp) +{ + return min(mhdp->host.link_rate, mhdp->sink.link_rate); +} + +static u8 cdns_mhdp_max_num_lanes(struct cdns_mhdp_device *mhdp) +{ + return min(mhdp->sink.lanes_cnt, mhdp->host.lanes_cnt); +} + +static u8 cdns_mhdp_eq_training_pattern_supported(struct cdns_mhdp_device *mhdp) +{ + return fls(mhdp->host.pattern_supp & mhdp->sink.pattern_supp); +} + +static bool cdns_mhdp_get_ssc_supported(struct cdns_mhdp_device *mhdp) +{ + /* Check if SSC is supported by both sides */ + return mhdp->host.ssc && mhdp->sink.ssc; +} + +static enum drm_connector_status cdns_mhdp_detect(struct cdns_mhdp_device *mhdp) +{ + dev_dbg(mhdp->dev, "%s: %d\n", __func__, mhdp->plugged); + + if (mhdp->plugged) + return connector_status_connected; + else + return connector_status_disconnected; +} + +static int cdns_mhdp_check_fw_version(struct cdns_mhdp_device *mhdp) +{ + u32 major_num, minor_num, revision; + u32 fw_ver, lib_ver; + + fw_ver = (readl(mhdp->regs + CDNS_VER_H) << 8) + | readl(mhdp->regs + CDNS_VER_L); + + lib_ver = (readl(mhdp->regs + CDNS_LIB_H_ADDR) << 8) + | readl(mhdp->regs + CDNS_LIB_L_ADDR); + + if (lib_ver < 33984) { + /* + * Older FW versions with major number 1, used to store FW + * version information by storing repository revision number + * in registers. This is for identifying these FW versions. + */ + major_num = 1; + minor_num = 2; + if (fw_ver == 26098) { + revision = 15; + } else if (lib_ver == 0 && fw_ver == 0) { + revision = 17; + } else { + dev_err(mhdp->dev, "Unsupported FW version: fw_ver = %u, lib_ver = %u\n", + fw_ver, lib_ver); + return -ENODEV; + } + } else { + /* To identify newer FW versions with major number 2 onwards. */ + major_num = fw_ver / 10000; + minor_num = (fw_ver / 100) % 100; + revision = (fw_ver % 10000) % 100; + } + + dev_dbg(mhdp->dev, "FW version: v%u.%u.%u\n", major_num, minor_num, + revision); + return 0; +} + +static int cdns_mhdp_fw_activate(const struct firmware *fw, + struct cdns_mhdp_device *mhdp) +{ + unsigned int reg; + int ret; + + /* Release uCPU reset and stall it. */ + writel(CDNS_CPU_STALL, mhdp->regs + CDNS_APB_CTRL); + + memcpy_toio(mhdp->regs + CDNS_MHDP_IMEM, fw->data, fw->size); + + /* Leave debug mode, release stall */ + writel(0, mhdp->regs + CDNS_APB_CTRL); + + /* + * Wait for the KEEP_ALIVE "message" on the first 8 bits. + * Updated each sched "tick" (~2ms) + */ + ret = readl_poll_timeout(mhdp->regs + CDNS_KEEP_ALIVE, reg, + reg & CDNS_KEEP_ALIVE_MASK, 500, + CDNS_KEEP_ALIVE_TIMEOUT); + if (ret) { + dev_err(mhdp->dev, + "device didn't give any life sign: reg %d\n", reg); + return ret; + } + + ret = cdns_mhdp_check_fw_version(mhdp); + if (ret) + return ret; + + /* Init events to 0 as it's not cleared by FW at boot but on read */ + readl(mhdp->regs + CDNS_SW_EVENT0); + readl(mhdp->regs + CDNS_SW_EVENT1); + readl(mhdp->regs + CDNS_SW_EVENT2); + readl(mhdp->regs + CDNS_SW_EVENT3); + + /* Activate uCPU */ + ret = cdns_mhdp_set_firmware_active(mhdp, true); + if (ret) + return ret; + + spin_lock(&mhdp->start_lock); + + mhdp->hw_state = MHDP_HW_READY; + + /* + * Here we must keep the lock while enabling the interrupts + * since it would otherwise be possible that interrupt enable + * code is executed after the bridge is detached. The similar + * situation is not possible in attach()/detach() callbacks + * since the hw_state changes from MHDP_HW_READY to + * MHDP_HW_STOPPED happens only due to driver removal when + * bridge should already be detached. + */ + if (mhdp->bridge_attached) + writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT, + mhdp->regs + CDNS_APB_INT_MASK); + + spin_unlock(&mhdp->start_lock); + + wake_up(&mhdp->fw_load_wq); + dev_dbg(mhdp->dev, "DP FW activated\n"); + + return 0; +} + +static void cdns_mhdp_fw_cb(const struct firmware *fw, void *context) +{ + struct cdns_mhdp_device *mhdp = context; + bool bridge_attached; + int ret; + + dev_dbg(mhdp->dev, "firmware callback\n"); + + if (!fw || !fw->data) { + dev_err(mhdp->dev, "%s: No firmware.\n", __func__); + return; + } + + ret = cdns_mhdp_fw_activate(fw, mhdp); + + release_firmware(fw); + + if (ret) + return; + + /* + * XXX how to make sure the bridge is still attached when + * calling drm_kms_helper_hotplug_event() after releasing + * the lock? We should not hold the spin lock when + * calling drm_kms_helper_hotplug_event() since it may + * cause a dead lock. FB-dev console calls detect from the + * same thread just down the call stack started here. + */ + spin_lock(&mhdp->start_lock); + bridge_attached = mhdp->bridge_attached; + spin_unlock(&mhdp->start_lock); + if (bridge_attached) { + if (mhdp->connector.dev) + drm_kms_helper_hotplug_event(mhdp->bridge.dev); + else + drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp)); + } +} + +static int cdns_mhdp_load_firmware(struct cdns_mhdp_device *mhdp) +{ + int ret; + + ret = request_firmware_nowait(THIS_MODULE, true, FW_NAME, mhdp->dev, + GFP_KERNEL, mhdp, cdns_mhdp_fw_cb); + if (ret) { + dev_err(mhdp->dev, "failed to load firmware (%s), ret: %d\n", + FW_NAME, ret); + return ret; + } + + return 0; +} + +static ssize_t cdns_mhdp_transfer(struct drm_dp_aux *aux, + struct drm_dp_aux_msg *msg) +{ + struct cdns_mhdp_device *mhdp = dev_get_drvdata(aux->dev); + int ret; + + if (msg->request != DP_AUX_NATIVE_WRITE && + msg->request != DP_AUX_NATIVE_READ) + return -EOPNOTSUPP; + + if (msg->request == DP_AUX_NATIVE_WRITE) { + const u8 *buf = msg->buffer; + unsigned int i; + + for (i = 0; i < msg->size; ++i) { + ret = cdns_mhdp_dpcd_write(mhdp, + msg->address + i, buf[i]); + if (!ret) + continue; + + dev_err(mhdp->dev, + "Failed to write DPCD addr %u\n", + msg->address + i); + + return ret; + } + } else { + ret = cdns_mhdp_dpcd_read(mhdp, msg->address, + msg->buffer, msg->size); + if (ret) { + dev_err(mhdp->dev, + "Failed to read DPCD addr %u\n", + msg->address); + + return ret; + } + } + + return msg->size; +} + +static int cdns_mhdp_link_training_init(struct cdns_mhdp_device *mhdp) +{ + union phy_configure_opts phy_cfg; + u32 reg32; + int ret; + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + /* Reset PHY configuration */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); + if (!mhdp->host.scrambler) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_ENHNCD, + mhdp->sink.enhanced & mhdp->host.enhanced); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_LANE_EN, + CDNS_DP_LANE_EN_LANES(mhdp->link.num_lanes)); + + cdns_mhdp_link_configure(&mhdp->aux, &mhdp->link); + phy_cfg.dp.link_rate = mhdp->link.rate / 100; + phy_cfg.dp.lanes = mhdp->link.num_lanes; + + memset(phy_cfg.dp.voltage, 0, sizeof(phy_cfg.dp.voltage)); + memset(phy_cfg.dp.pre, 0, sizeof(phy_cfg.dp.pre)); + + phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp); + phy_cfg.dp.set_lanes = true; + phy_cfg.dp.set_rate = true; + phy_cfg.dp.set_voltages = true; + ret = phy_configure(mhdp->phy, &phy_cfg); + if (ret) { + dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n", + __func__, ret); + return ret; + } + + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, + CDNS_PHY_COMMON_CONFIG | + CDNS_PHY_TRAINING_EN | + CDNS_PHY_TRAINING_TYPE(1) | + CDNS_PHY_SCRAMBLER_BYPASS); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE); + + return 0; +} + +static void cdns_mhdp_get_adjust_train(struct cdns_mhdp_device *mhdp, + u8 link_status[DP_LINK_STATUS_SIZE], + u8 lanes_data[CDNS_DP_MAX_NUM_LANES], + union phy_configure_opts *phy_cfg) +{ + u8 adjust, max_pre_emph, max_volt_swing; + u8 set_volt, set_pre; + unsigned int i; + + max_pre_emph = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis) + << DP_TRAIN_PRE_EMPHASIS_SHIFT; + max_volt_swing = CDNS_VOLT_SWING(mhdp->host.volt_swing); + + for (i = 0; i < mhdp->link.num_lanes; i++) { + /* Check if Voltage swing and pre-emphasis are within limits */ + adjust = drm_dp_get_adjust_request_voltage(link_status, i); + set_volt = min(adjust, max_volt_swing); + + adjust = drm_dp_get_adjust_request_pre_emphasis(link_status, i); + set_pre = min(adjust, max_pre_emph) + >> DP_TRAIN_PRE_EMPHASIS_SHIFT; + + /* + * Voltage swing level and pre-emphasis level combination is + * not allowed: leaving pre-emphasis as-is, and adjusting + * voltage swing. + */ + if (set_volt + set_pre > 3) + set_volt = 3 - set_pre; + + phy_cfg->dp.voltage[i] = set_volt; + lanes_data[i] = set_volt; + + if (set_volt == max_volt_swing) + lanes_data[i] |= DP_TRAIN_MAX_SWING_REACHED; + + phy_cfg->dp.pre[i] = set_pre; + lanes_data[i] |= (set_pre << DP_TRAIN_PRE_EMPHASIS_SHIFT); + + if (set_pre == (max_pre_emph >> DP_TRAIN_PRE_EMPHASIS_SHIFT)) + lanes_data[i] |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; + } +} + +static +void cdns_mhdp_set_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE], + unsigned int lane, u8 volt) +{ + unsigned int s = ((lane & 1) ? + DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : + DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); + unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1); + + link_status[idx] &= ~(DP_ADJUST_VOLTAGE_SWING_LANE0_MASK << s); + link_status[idx] |= volt << s; +} + +static +void cdns_mhdp_set_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE], + unsigned int lane, u8 pre_emphasis) +{ + unsigned int s = ((lane & 1) ? + DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : + DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); + unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1); + + link_status[idx] &= ~(DP_ADJUST_PRE_EMPHASIS_LANE0_MASK << s); + link_status[idx] |= pre_emphasis << s; +} + +static void cdns_mhdp_adjust_requested_eq(struct cdns_mhdp_device *mhdp, + u8 link_status[DP_LINK_STATUS_SIZE]) +{ + u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); + u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing); + unsigned int i; + u8 volt, pre; + + for (i = 0; i < mhdp->link.num_lanes; i++) { + volt = drm_dp_get_adjust_request_voltage(link_status, i); + pre = drm_dp_get_adjust_request_pre_emphasis(link_status, i); + if (volt + pre > 3) + cdns_mhdp_set_adjust_request_voltage(link_status, i, + 3 - pre); + if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING) + cdns_mhdp_set_adjust_request_voltage(link_status, i, + max_volt); + if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS) + cdns_mhdp_set_adjust_request_pre_emphasis(link_status, + i, max_pre); + } +} + +static void cdns_mhdp_print_lt_status(const char *prefix, + struct cdns_mhdp_device *mhdp, + union phy_configure_opts *phy_cfg) +{ + char vs[8] = "0/0/0/0"; + char pe[8] = "0/0/0/0"; + unsigned int i; + + for (i = 0; i < mhdp->link.num_lanes; i++) { + vs[i * 2] = '0' + phy_cfg->dp.voltage[i]; + pe[i * 2] = '0' + phy_cfg->dp.pre[i]; + } + + vs[i * 2 - 1] = '\0'; + pe[i * 2 - 1] = '\0'; + + dev_dbg(mhdp->dev, "%s, %u lanes, %u Mbps, vs %s, pe %s\n", + prefix, + mhdp->link.num_lanes, mhdp->link.rate / 100, + vs, pe); +} + +static bool cdns_mhdp_link_training_channel_eq(struct cdns_mhdp_device *mhdp, + u8 eq_tps, + unsigned int training_interval) +{ + u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0; + u8 link_status[DP_LINK_STATUS_SIZE]; + union phy_configure_opts phy_cfg; + u32 reg32; + int ret; + bool r; + + dev_dbg(mhdp->dev, "Starting EQ phase\n"); + + /* Enable link training TPS[eq_tps] in PHY */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_EN | + CDNS_PHY_TRAINING_TYPE(eq_tps); + if (eq_tps != 4) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + (eq_tps != 4) ? eq_tps | DP_LINK_SCRAMBLING_DISABLE : + CDNS_DP_TRAINING_PATTERN_4); + + drm_dp_dpcd_read_link_status(&mhdp->aux, link_status); + + do { + cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data, + &phy_cfg); + phy_cfg.dp.lanes = mhdp->link.num_lanes; + phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp); + phy_cfg.dp.set_lanes = false; + phy_cfg.dp.set_rate = false; + phy_cfg.dp.set_voltages = true; + ret = phy_configure(mhdp->phy, &phy_cfg); + if (ret) { + dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n", + __func__, ret); + goto err; + } + + cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, + training_interval, lanes_data, link_status); + + r = drm_dp_clock_recovery_ok(link_status, mhdp->link.num_lanes); + if (!r) + goto err; + + if (drm_dp_channel_eq_ok(link_status, mhdp->link.num_lanes)) { + cdns_mhdp_print_lt_status("EQ phase ok", mhdp, + &phy_cfg); + return true; + } + + fail_counter_short++; + + cdns_mhdp_adjust_requested_eq(mhdp, link_status); + } while (fail_counter_short < 5); + +err: + cdns_mhdp_print_lt_status("EQ phase failed", mhdp, &phy_cfg); + + return false; +} + +static void cdns_mhdp_adjust_requested_cr(struct cdns_mhdp_device *mhdp, + u8 link_status[DP_LINK_STATUS_SIZE], + u8 *req_volt, u8 *req_pre) +{ + const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing); + const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); + unsigned int i; + + for (i = 0; i < mhdp->link.num_lanes; i++) { + u8 val; + + val = mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING ? + max_volt : req_volt[i]; + cdns_mhdp_set_adjust_request_voltage(link_status, i, val); + + val = mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS ? + max_pre : req_pre[i]; + cdns_mhdp_set_adjust_request_pre_emphasis(link_status, i, val); + } +} + +static +void cdns_mhdp_validate_cr(struct cdns_mhdp_device *mhdp, bool *cr_done, + bool *same_before_adjust, bool *max_swing_reached, + u8 before_cr[CDNS_DP_MAX_NUM_LANES], + u8 after_cr[DP_LINK_STATUS_SIZE], u8 *req_volt, + u8 *req_pre) +{ + const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing); + const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); + bool same_pre, same_volt; + unsigned int i; + u8 adjust; + + *same_before_adjust = false; + *max_swing_reached = false; + *cr_done = drm_dp_clock_recovery_ok(after_cr, mhdp->link.num_lanes); + + for (i = 0; i < mhdp->link.num_lanes; i++) { + adjust = drm_dp_get_adjust_request_voltage(after_cr, i); + req_volt[i] = min(adjust, max_volt); + + adjust = drm_dp_get_adjust_request_pre_emphasis(after_cr, i) >> + DP_TRAIN_PRE_EMPHASIS_SHIFT; + req_pre[i] = min(adjust, max_pre); + + same_pre = (before_cr[i] & DP_TRAIN_PRE_EMPHASIS_MASK) == + req_pre[i] << DP_TRAIN_PRE_EMPHASIS_SHIFT; + same_volt = (before_cr[i] & DP_TRAIN_VOLTAGE_SWING_MASK) == + req_volt[i]; + if (same_pre && same_volt) + *same_before_adjust = true; + + /* 3.1.5.2 in DP Standard v1.4. Table 3-1 */ + if (!*cr_done && req_volt[i] + req_pre[i] >= 3) { + *max_swing_reached = true; + return; + } + } +} + +static bool cdns_mhdp_link_training_cr(struct cdns_mhdp_device *mhdp) +{ + u8 lanes_data[CDNS_DP_MAX_NUM_LANES], + fail_counter_short = 0, fail_counter_cr_long = 0; + u8 link_status[DP_LINK_STATUS_SIZE]; + bool cr_done; + union phy_configure_opts phy_cfg; + int ret; + + dev_dbg(mhdp->dev, "Starting CR phase\n"); + + ret = cdns_mhdp_link_training_init(mhdp); + if (ret) + goto err; + + drm_dp_dpcd_read_link_status(&mhdp->aux, link_status); + + do { + u8 requested_adjust_volt_swing[CDNS_DP_MAX_NUM_LANES] = {}; + u8 requested_adjust_pre_emphasis[CDNS_DP_MAX_NUM_LANES] = {}; + bool same_before_adjust, max_swing_reached; + + cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data, + &phy_cfg); + phy_cfg.dp.lanes = mhdp->link.num_lanes; + phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp); + phy_cfg.dp.set_lanes = false; + phy_cfg.dp.set_rate = false; + phy_cfg.dp.set_voltages = true; + ret = phy_configure(mhdp->phy, &phy_cfg); + if (ret) { + dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n", + __func__, ret); + goto err; + } + + cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, 100, + lanes_data, link_status); + + cdns_mhdp_validate_cr(mhdp, &cr_done, &same_before_adjust, + &max_swing_reached, lanes_data, + link_status, + requested_adjust_volt_swing, + requested_adjust_pre_emphasis); + + if (max_swing_reached) { + dev_err(mhdp->dev, "CR: max swing reached\n"); + goto err; + } + + if (cr_done) { + cdns_mhdp_print_lt_status("CR phase ok", mhdp, + &phy_cfg); + return true; + } + + /* Not all CR_DONE bits set */ + fail_counter_cr_long++; + + if (same_before_adjust) { + fail_counter_short++; + continue; + } + + fail_counter_short = 0; + /* + * Voltage swing/pre-emphasis adjust requested + * during CR phase + */ + cdns_mhdp_adjust_requested_cr(mhdp, link_status, + requested_adjust_volt_swing, + requested_adjust_pre_emphasis); + } while (fail_counter_short < 5 && fail_counter_cr_long < 10); + +err: + cdns_mhdp_print_lt_status("CR phase failed", mhdp, &phy_cfg); + + return false; +} + +static void cdns_mhdp_lower_link_rate(struct cdns_mhdp_link *link) +{ + switch (drm_dp_link_rate_to_bw_code(link->rate)) { + case DP_LINK_BW_2_7: + link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_1_62); + break; + case DP_LINK_BW_5_4: + link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_2_7); + break; + case DP_LINK_BW_8_1: + link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4); + break; + } +} + +static int cdns_mhdp_link_training(struct cdns_mhdp_device *mhdp, + unsigned int training_interval) +{ + u32 reg32; + const u8 eq_tps = cdns_mhdp_eq_training_pattern_supported(mhdp); + int ret; + + while (1) { + if (!cdns_mhdp_link_training_cr(mhdp)) { + if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) != + DP_LINK_BW_1_62) { + dev_dbg(mhdp->dev, + "Reducing link rate during CR phase\n"); + cdns_mhdp_lower_link_rate(&mhdp->link); + + continue; + } else if (mhdp->link.num_lanes > 1) { + dev_dbg(mhdp->dev, + "Reducing lanes number during CR phase\n"); + mhdp->link.num_lanes >>= 1; + mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp); + + continue; + } + + dev_err(mhdp->dev, + "Link training failed during CR phase\n"); + goto err; + } + + if (cdns_mhdp_link_training_channel_eq(mhdp, eq_tps, + training_interval)) + break; + + if (mhdp->link.num_lanes > 1) { + dev_dbg(mhdp->dev, + "Reducing lanes number during EQ phase\n"); + mhdp->link.num_lanes >>= 1; + + continue; + } else if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) != + DP_LINK_BW_1_62) { + dev_dbg(mhdp->dev, + "Reducing link rate during EQ phase\n"); + cdns_mhdp_lower_link_rate(&mhdp->link); + mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp); + + continue; + } + + dev_err(mhdp->dev, "Link training failed during EQ phase\n"); + goto err; + } + + dev_dbg(mhdp->dev, "Link training ok. Lanes: %u, Rate %u Mbps\n", + mhdp->link.num_lanes, mhdp->link.rate / 100); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + mhdp->host.scrambler ? 0 : + DP_LINK_SCRAMBLING_DISABLE); + + ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, ®32); + if (ret < 0) { + dev_err(mhdp->dev, + "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n", + ret); + return ret; + } + reg32 &= ~GENMASK(1, 0); + reg32 |= CDNS_DP_NUM_LANES(mhdp->link.num_lanes); + reg32 |= CDNS_DP_WR_FAILING_EDGE_VSYNC; + reg32 |= CDNS_DP_FRAMER_EN; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, reg32); + + /* Reset PHY config */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); + if (!mhdp->host.scrambler) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + return 0; +err: + /* Reset PHY config */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); + if (!mhdp->host.scrambler) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + return -EIO; +} + +static u32 cdns_mhdp_get_training_interval_us(struct cdns_mhdp_device *mhdp, + u32 interval) +{ + if (interval == 0) + return 400; + if (interval < 5) + return 4000 << (interval - 1); + dev_err(mhdp->dev, + "wrong training interval returned by DPCD: %d\n", interval); + return 0; +} + +static void cdns_mhdp_fill_host_caps(struct cdns_mhdp_device *mhdp) +{ + unsigned int link_rate; + + /* Get source capabilities based on PHY attributes */ + + mhdp->host.lanes_cnt = mhdp->phy->attrs.bus_width; + if (!mhdp->host.lanes_cnt) + mhdp->host.lanes_cnt = 4; + + link_rate = mhdp->phy->attrs.max_link_rate; + if (!link_rate) + link_rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_8_1); + else + /* PHY uses Mb/s, DRM uses tens of kb/s. */ + link_rate *= 100; + + mhdp->host.link_rate = link_rate; + mhdp->host.volt_swing = CDNS_VOLT_SWING(3); + mhdp->host.pre_emphasis = CDNS_PRE_EMPHASIS(3); + mhdp->host.pattern_supp = CDNS_SUPPORT_TPS(1) | + CDNS_SUPPORT_TPS(2) | CDNS_SUPPORT_TPS(3) | + CDNS_SUPPORT_TPS(4); + mhdp->host.lane_mapping = CDNS_LANE_MAPPING_NORMAL; + mhdp->host.fast_link = false; + mhdp->host.enhanced = true; + mhdp->host.scrambler = true; + mhdp->host.ssc = false; +} + +static void cdns_mhdp_fill_sink_caps(struct cdns_mhdp_device *mhdp, + u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + mhdp->sink.link_rate = mhdp->link.rate; + mhdp->sink.lanes_cnt = mhdp->link.num_lanes; + mhdp->sink.enhanced = !!(mhdp->link.capabilities & + DP_LINK_CAP_ENHANCED_FRAMING); + + /* Set SSC support */ + mhdp->sink.ssc = !!(dpcd[DP_MAX_DOWNSPREAD] & + DP_MAX_DOWNSPREAD_0_5); + + /* Set TPS support */ + mhdp->sink.pattern_supp = CDNS_SUPPORT_TPS(1) | CDNS_SUPPORT_TPS(2); + if (drm_dp_tps3_supported(dpcd)) + mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(3); + if (drm_dp_tps4_supported(dpcd)) + mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(4); + + /* Set fast link support */ + mhdp->sink.fast_link = !!(dpcd[DP_MAX_DOWNSPREAD] & + DP_NO_AUX_HANDSHAKE_LINK_TRAINING); +} + +static int cdns_mhdp_link_up(struct cdns_mhdp_device *mhdp) +{ + u8 dpcd[DP_RECEIVER_CAP_SIZE], amp[2]; + u32 resp, interval, interval_us; + u8 ext_cap_chk = 0; + unsigned int addr; + int err; + + WARN_ON(!mutex_is_locked(&mhdp->link_mutex)); + + drm_dp_dpcd_readb(&mhdp->aux, DP_TRAINING_AUX_RD_INTERVAL, + &ext_cap_chk); + + if (ext_cap_chk & DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT) + addr = DP_DP13_DPCD_REV; + else + addr = DP_DPCD_REV; + + err = drm_dp_dpcd_read(&mhdp->aux, addr, dpcd, DP_RECEIVER_CAP_SIZE); + if (err < 0) { + dev_err(mhdp->dev, "Failed to read receiver capabilities\n"); + return err; + } + + mhdp->link.revision = dpcd[0]; + mhdp->link.rate = drm_dp_bw_code_to_link_rate(dpcd[1]); + mhdp->link.num_lanes = dpcd[2] & DP_MAX_LANE_COUNT_MASK; + + if (dpcd[2] & DP_ENHANCED_FRAME_CAP) + mhdp->link.capabilities |= DP_LINK_CAP_ENHANCED_FRAMING; + + dev_dbg(mhdp->dev, "Set sink device power state via DPCD\n"); + cdns_mhdp_link_power_up(&mhdp->aux, &mhdp->link); + + cdns_mhdp_fill_sink_caps(mhdp, dpcd); + + mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp); + mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp); + + /* Disable framer for link training */ + err = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp); + if (err < 0) { + dev_err(mhdp->dev, + "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n", + err); + return err; + } + + resp &= ~CDNS_DP_FRAMER_EN; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp); + + /* Spread AMP if required, enable 8b/10b coding */ + amp[0] = cdns_mhdp_get_ssc_supported(mhdp) ? DP_SPREAD_AMP_0_5 : 0; + amp[1] = DP_SET_ANSI_8B10B; + drm_dp_dpcd_write(&mhdp->aux, DP_DOWNSPREAD_CTRL, amp, 2); + + if (mhdp->host.fast_link & mhdp->sink.fast_link) { + dev_err(mhdp->dev, "fastlink not supported\n"); + return -EOPNOTSUPP; + } + + interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & DP_TRAINING_AUX_RD_MASK; + interval_us = cdns_mhdp_get_training_interval_us(mhdp, interval); + if (!interval_us || + cdns_mhdp_link_training(mhdp, interval_us)) { + dev_err(mhdp->dev, "Link training failed. Exiting.\n"); + return -EIO; + } + + mhdp->link_up = true; + + return 0; +} + +static void cdns_mhdp_link_down(struct cdns_mhdp_device *mhdp) +{ + WARN_ON(!mutex_is_locked(&mhdp->link_mutex)); + + if (mhdp->plugged) + cdns_mhdp_link_power_down(&mhdp->aux, &mhdp->link); + + mhdp->link_up = false; +} + +static struct edid *cdns_mhdp_get_edid(struct cdns_mhdp_device *mhdp, + struct drm_connector *connector) +{ + if (!mhdp->plugged) + return NULL; + + return drm_do_get_edid(connector, cdns_mhdp_get_edid_block, mhdp); +} + +static int cdns_mhdp_get_modes(struct drm_connector *connector) +{ + struct cdns_mhdp_device *mhdp = connector_to_mhdp(connector); + struct edid *edid; + int num_modes; + + if (!mhdp->plugged) + return 0; + + edid = cdns_mhdp_get_edid(mhdp, connector); + if (!edid) { + dev_err(mhdp->dev, "Failed to read EDID\n"); + return 0; + } + + drm_connector_update_edid_property(connector, edid); + num_modes = drm_add_edid_modes(connector, edid); + kfree(edid); + + /* + * HACK: Warn about unsupported display formats until we deal + * with them correctly. + */ + if (connector->display_info.color_formats && + !(connector->display_info.color_formats & + mhdp->display_fmt.color_format)) + dev_warn(mhdp->dev, + "%s: No supported color_format found (0x%08x)\n", + __func__, connector->display_info.color_formats); + + if (connector->display_info.bpc && + connector->display_info.bpc < mhdp->display_fmt.bpc) + dev_warn(mhdp->dev, "%s: Display bpc only %d < %d\n", + __func__, connector->display_info.bpc, + mhdp->display_fmt.bpc); + + return num_modes; +} + +static int cdns_mhdp_connector_detect(struct drm_connector *conn, + struct drm_modeset_acquire_ctx *ctx, + bool force) +{ + struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn); + + return cdns_mhdp_detect(mhdp); +} + +static u32 cdns_mhdp_get_bpp(struct cdns_mhdp_display_fmt *fmt) +{ + u32 bpp; + + if (fmt->y_only) + return fmt->bpc; + + switch (fmt->color_format) { + case DRM_COLOR_FORMAT_RGB444: + case DRM_COLOR_FORMAT_YCRCB444: + bpp = fmt->bpc * 3; + break; + case DRM_COLOR_FORMAT_YCRCB422: + bpp = fmt->bpc * 2; + break; + case DRM_COLOR_FORMAT_YCRCB420: + bpp = fmt->bpc * 3 / 2; + break; + default: + bpp = fmt->bpc * 3; + WARN_ON(1); + } + return bpp; +} + +static +bool cdns_mhdp_bandwidth_ok(struct cdns_mhdp_device *mhdp, + const struct drm_display_mode *mode, + unsigned int lanes, unsigned int rate) +{ + u32 max_bw, req_bw, bpp; + + /* + * mode->clock is expressed in kHz. Multiplying by bpp and dividing by 8 + * we get the number of kB/s. DisplayPort applies a 8b-10b encoding, the + * value thus equals the bandwidth in 10kb/s units, which matches the + * units of the rate parameter. + */ + + bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt); + req_bw = mode->clock * bpp / 8; + max_bw = lanes * rate; + if (req_bw > max_bw) { + dev_dbg(mhdp->dev, + "Unsupported Mode: %s, Req BW: %u, Available Max BW:%u\n", + mode->name, req_bw, max_bw); + + return false; + } + + return true; +} + +static +enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn, + struct drm_display_mode *mode) +{ + struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn); + + mutex_lock(&mhdp->link_mutex); + + if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes, + mhdp->link.rate)) { + mutex_unlock(&mhdp->link_mutex); + return MODE_CLOCK_HIGH; + } + + mutex_unlock(&mhdp->link_mutex); + return MODE_OK; +} + +static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = { + .detect_ctx = cdns_mhdp_connector_detect, + .get_modes = cdns_mhdp_get_modes, + .mode_valid = cdns_mhdp_mode_valid, +}; + +static const struct drm_connector_funcs cdns_mhdp_conn_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, + .reset = drm_atomic_helper_connector_reset, + .destroy = drm_connector_cleanup, +}; + +static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp) +{ + u32 bus_format = MEDIA_BUS_FMT_RGB121212_1X36; + struct drm_connector *conn = &mhdp->connector; + struct drm_bridge *bridge = &mhdp->bridge; + int ret; + + if (!bridge->encoder) { + dev_err(mhdp->dev, "Parent encoder object not found"); + return -ENODEV; + } + + conn->polled = DRM_CONNECTOR_POLL_HPD; + + ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs, + DRM_MODE_CONNECTOR_DisplayPort); + if (ret) { + dev_err(mhdp->dev, "Failed to initialize connector with drm\n"); + return ret; + } + + drm_connector_helper_add(conn, &cdns_mhdp_conn_helper_funcs); + + ret = drm_display_info_set_bus_formats(&conn->display_info, + &bus_format, 1); + if (ret) + return ret; + + ret = drm_connector_attach_encoder(conn, bridge->encoder); + if (ret) { + dev_err(mhdp->dev, "Failed to attach connector to encoder\n"); + return ret; + } + + return 0; +} + +static int cdns_mhdp_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + bool hw_ready; + int ret; + + dev_dbg(mhdp->dev, "%s\n", __func__); + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { + ret = cdns_mhdp_connector_init(mhdp); + if (ret) + return ret; + } + + spin_lock(&mhdp->start_lock); + + mhdp->bridge_attached = true; + hw_ready = mhdp->hw_state == MHDP_HW_READY; + + spin_unlock(&mhdp->start_lock); + + /* Enable SW event interrupts */ + if (hw_ready) + writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT, + mhdp->regs + CDNS_APB_INT_MASK); + + return 0; +} + +static void cdns_mhdp_configure_video(struct cdns_mhdp_device *mhdp, + const struct drm_display_mode *mode) +{ + unsigned int dp_framer_sp = 0, msa_horizontal_1, + msa_vertical_1, bnd_hsync2vsync, hsync2vsync_pol_ctrl, + misc0 = 0, misc1 = 0, pxl_repr, + front_porch, back_porch, msa_h0, msa_v0, hsync, vsync, + dp_vertical_1; + u8 stream_id = mhdp->stream_id; + u32 bpp, bpc, pxlfmt, framer; + int ret; + + pxlfmt = mhdp->display_fmt.color_format; + bpc = mhdp->display_fmt.bpc; + + /* + * If YCBCR supported and stream not SD, use ITU709 + * Need to handle ITU version with YCBCR420 when supported + */ + if ((pxlfmt == DRM_COLOR_FORMAT_YCRCB444 || + pxlfmt == DRM_COLOR_FORMAT_YCRCB422) && mode->crtc_vdisplay >= 720) + misc0 = DP_YCBCR_COEFFICIENTS_ITU709; + + bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt); + + switch (pxlfmt) { + case DRM_COLOR_FORMAT_RGB444: + pxl_repr = CDNS_DP_FRAMER_RGB << CDNS_DP_FRAMER_PXL_FORMAT; + misc0 |= DP_COLOR_FORMAT_RGB; + break; + case DRM_COLOR_FORMAT_YCRCB444: + pxl_repr = CDNS_DP_FRAMER_YCBCR444 << CDNS_DP_FRAMER_PXL_FORMAT; + misc0 |= DP_COLOR_FORMAT_YCbCr444 | DP_TEST_DYNAMIC_RANGE_CEA; + break; + case DRM_COLOR_FORMAT_YCRCB422: + pxl_repr = CDNS_DP_FRAMER_YCBCR422 << CDNS_DP_FRAMER_PXL_FORMAT; + misc0 |= DP_COLOR_FORMAT_YCbCr422 | DP_TEST_DYNAMIC_RANGE_CEA; + break; + case DRM_COLOR_FORMAT_YCRCB420: + pxl_repr = CDNS_DP_FRAMER_YCBCR420 << CDNS_DP_FRAMER_PXL_FORMAT; + break; + default: + pxl_repr = CDNS_DP_FRAMER_Y_ONLY << CDNS_DP_FRAMER_PXL_FORMAT; + } + + switch (bpc) { + case 6: + misc0 |= DP_TEST_BIT_DEPTH_6; + pxl_repr |= CDNS_DP_FRAMER_6_BPC; + break; + case 8: + misc0 |= DP_TEST_BIT_DEPTH_8; + pxl_repr |= CDNS_DP_FRAMER_8_BPC; + break; + case 10: + misc0 |= DP_TEST_BIT_DEPTH_10; + pxl_repr |= CDNS_DP_FRAMER_10_BPC; + break; + case 12: + misc0 |= DP_TEST_BIT_DEPTH_12; + pxl_repr |= CDNS_DP_FRAMER_12_BPC; + break; + case 16: + misc0 |= DP_TEST_BIT_DEPTH_16; + pxl_repr |= CDNS_DP_FRAMER_16_BPC; + break; + } + + bnd_hsync2vsync = CDNS_IP_BYPASS_V_INTERFACE; + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + bnd_hsync2vsync |= CDNS_IP_DET_INTERLACE_FORMAT; + + cdns_mhdp_reg_write(mhdp, CDNS_BND_HSYNC2VSYNC(stream_id), + bnd_hsync2vsync); + + hsync2vsync_pol_ctrl = 0; + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + hsync2vsync_pol_ctrl |= CDNS_H2V_HSYNC_POL_ACTIVE_LOW; + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + hsync2vsync_pol_ctrl |= CDNS_H2V_VSYNC_POL_ACTIVE_LOW; + cdns_mhdp_reg_write(mhdp, CDNS_HSYNC2VSYNC_POL_CTRL(stream_id), + hsync2vsync_pol_ctrl); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_PXL_REPR(stream_id), pxl_repr); + + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + dp_framer_sp |= CDNS_DP_FRAMER_INTERLACE; + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + dp_framer_sp |= CDNS_DP_FRAMER_HSYNC_POL_LOW; + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + dp_framer_sp |= CDNS_DP_FRAMER_VSYNC_POL_LOW; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_SP(stream_id), dp_framer_sp); + + front_porch = mode->crtc_hsync_start - mode->crtc_hdisplay; + back_porch = mode->crtc_htotal - mode->crtc_hsync_end; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRONT_BACK_PORCH(stream_id), + CDNS_DP_FRONT_PORCH(front_porch) | + CDNS_DP_BACK_PORCH(back_porch)); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_BYTE_COUNT(stream_id), + mode->crtc_hdisplay * bpp / 8); + + msa_h0 = mode->crtc_htotal - mode->crtc_hsync_start; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_0(stream_id), + CDNS_DP_MSAH0_H_TOTAL(mode->crtc_htotal) | + CDNS_DP_MSAH0_HSYNC_START(msa_h0)); + + hsync = mode->crtc_hsync_end - mode->crtc_hsync_start; + msa_horizontal_1 = CDNS_DP_MSAH1_HSYNC_WIDTH(hsync) | + CDNS_DP_MSAH1_HDISP_WIDTH(mode->crtc_hdisplay); + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + msa_horizontal_1 |= CDNS_DP_MSAH1_HSYNC_POL_LOW; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_1(stream_id), + msa_horizontal_1); + + msa_v0 = mode->crtc_vtotal - mode->crtc_vsync_start; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_0(stream_id), + CDNS_DP_MSAV0_V_TOTAL(mode->crtc_vtotal) | + CDNS_DP_MSAV0_VSYNC_START(msa_v0)); + + vsync = mode->crtc_vsync_end - mode->crtc_vsync_start; + msa_vertical_1 = CDNS_DP_MSAV1_VSYNC_WIDTH(vsync) | + CDNS_DP_MSAV1_VDISP_WIDTH(mode->crtc_vdisplay); + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + msa_vertical_1 |= CDNS_DP_MSAV1_VSYNC_POL_LOW; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_1(stream_id), + msa_vertical_1); + + if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && + mode->crtc_vtotal % 2 == 0) + misc1 = DP_TEST_INTERLACED; + if (mhdp->display_fmt.y_only) + misc1 |= CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY; + /* Use VSC SDP for Y420 */ + if (pxlfmt == DRM_COLOR_FORMAT_YCRCB420) + misc1 = CDNS_DP_TEST_VSC_SDP; + + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_MISC(stream_id), + misc0 | (misc1 << 8)); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_HORIZONTAL(stream_id), + CDNS_DP_H_HSYNC_WIDTH(hsync) | + CDNS_DP_H_H_TOTAL(mode->crtc_hdisplay)); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_0(stream_id), + CDNS_DP_V0_VHEIGHT(mode->crtc_vdisplay) | + CDNS_DP_V0_VSTART(msa_v0)); + + dp_vertical_1 = CDNS_DP_V1_VTOTAL(mode->crtc_vtotal); + if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && + mode->crtc_vtotal % 2 == 0) + dp_vertical_1 |= CDNS_DP_V1_VTOTAL_EVEN; + + cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_1(stream_id), dp_vertical_1); + + cdns_mhdp_reg_write_bit(mhdp, CDNS_DP_VB_ID(stream_id), 2, 1, + (mode->flags & DRM_MODE_FLAG_INTERLACE) ? + CDNS_DP_VB_ID_INTERLACED : 0); + + ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &framer); + if (ret < 0) { + dev_err(mhdp->dev, + "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n", + ret); + return; + } + framer |= CDNS_DP_FRAMER_EN; + framer &= ~CDNS_DP_NO_VIDEO_MODE; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, framer); +} + +static void cdns_mhdp_sst_enable(struct cdns_mhdp_device *mhdp, + const struct drm_display_mode *mode) +{ + u32 rate, vs, required_bandwidth, available_bandwidth; + s32 line_thresh1, line_thresh2, line_thresh = 0; + int pxlclock = mode->crtc_clock; + u32 tu_size = 64; + u32 bpp; + + /* Get rate in MSymbols per second per lane */ + rate = mhdp->link.rate / 1000; + + bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt); + + required_bandwidth = pxlclock * bpp / 8; + available_bandwidth = mhdp->link.num_lanes * rate; + + vs = tu_size * required_bandwidth / available_bandwidth; + vs /= 1000; + + if (vs == tu_size) + vs = tu_size - 1; + + line_thresh1 = ((vs + 1) << 5) * 8 / bpp; + line_thresh2 = (pxlclock << 5) / 1000 / rate * (vs + 1) - (1 << 5); + line_thresh = line_thresh1 - line_thresh2 / (s32)mhdp->link.num_lanes; + line_thresh = (line_thresh >> 5) + 2; + + mhdp->stream_id = 0; + + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_TU, + CDNS_DP_FRAMER_TU_VS(vs) | + CDNS_DP_FRAMER_TU_SIZE(tu_size) | + CDNS_DP_FRAMER_TU_CNT_RST_EN); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_LINE_THRESH(0), + line_thresh & GENMASK(5, 0)); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_STREAM_CONFIG_2(0), + CDNS_DP_SC2_TU_VS_DIFF((tu_size - vs > 3) ? + 0 : tu_size - vs)); + + cdns_mhdp_configure_video(mhdp, mode); +} + +static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + struct drm_atomic_state *state = bridge_state->base.state; + struct cdns_mhdp_bridge_state *mhdp_state; + struct drm_crtc_state *crtc_state; + struct drm_connector *connector; + struct drm_connector_state *conn_state; + struct drm_bridge_state *new_state; + const struct drm_display_mode *mode; + u32 resp; + int ret; + + dev_dbg(mhdp->dev, "bridge enable\n"); + + mutex_lock(&mhdp->link_mutex); + + if (mhdp->plugged && !mhdp->link_up) { + ret = cdns_mhdp_link_up(mhdp); + if (ret < 0) + goto out; + } + + if (mhdp->info && mhdp->info->ops && mhdp->info->ops->enable) + mhdp->info->ops->enable(mhdp); + + /* Enable VIF clock for stream 0 */ + ret = cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp); + if (ret < 0) { + dev_err(mhdp->dev, "Failed to read CDNS_DPTX_CAR %d\n", ret); + goto out; + } + + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR, + resp | CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN); + + connector = drm_atomic_get_new_connector_for_encoder(state, + bridge->encoder); + if (WARN_ON(!connector)) + goto out; + + conn_state = drm_atomic_get_new_connector_state(state, connector); + if (WARN_ON(!conn_state)) + goto out; + + crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc); + if (WARN_ON(!crtc_state)) + goto out; + + mode = &crtc_state->adjusted_mode; + + new_state = drm_atomic_get_new_bridge_state(state, bridge); + if (WARN_ON(!new_state)) + goto out; + + if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes, + mhdp->link.rate)) { + ret = -EINVAL; + goto out; + } + + cdns_mhdp_sst_enable(mhdp, mode); + + mhdp_state = to_cdns_mhdp_bridge_state(new_state); + + mhdp_state->current_mode = drm_mode_duplicate(bridge->dev, mode); + drm_mode_set_name(mhdp_state->current_mode); + + dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, mode->name); + + mhdp->bridge_enabled = true; + +out: + mutex_unlock(&mhdp->link_mutex); + if (ret < 0) + schedule_work(&mhdp->modeset_retry_work); +} + +static void cdns_mhdp_atomic_disable(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + u32 resp; + + dev_dbg(mhdp->dev, "%s\n", __func__); + + mutex_lock(&mhdp->link_mutex); + + mhdp->bridge_enabled = false; + cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp); + resp &= ~CDNS_DP_FRAMER_EN; + resp |= CDNS_DP_NO_VIDEO_MODE; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp); + + cdns_mhdp_link_down(mhdp); + + /* Disable VIF clock for stream 0 */ + cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp); + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR, + resp & ~(CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN)); + + if (mhdp->info && mhdp->info->ops && mhdp->info->ops->disable) + mhdp->info->ops->disable(mhdp); + + mutex_unlock(&mhdp->link_mutex); +} + +static void cdns_mhdp_detach(struct drm_bridge *bridge) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + + dev_dbg(mhdp->dev, "%s\n", __func__); + + spin_lock(&mhdp->start_lock); + + mhdp->bridge_attached = false; + + spin_unlock(&mhdp->start_lock); + + writel(~0, mhdp->regs + CDNS_APB_INT_MASK); +} + +static struct drm_bridge_state * +cdns_mhdp_bridge_atomic_duplicate_state(struct drm_bridge *bridge) +{ + struct cdns_mhdp_bridge_state *state; + + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (!state) + return NULL; + + __drm_atomic_helper_bridge_duplicate_state(bridge, &state->base); + + return &state->base; +} + +static void +cdns_mhdp_bridge_atomic_destroy_state(struct drm_bridge *bridge, + struct drm_bridge_state *state) +{ + struct cdns_mhdp_bridge_state *cdns_mhdp_state; + + cdns_mhdp_state = to_cdns_mhdp_bridge_state(state); + + if (cdns_mhdp_state->current_mode) { + drm_mode_destroy(bridge->dev, cdns_mhdp_state->current_mode); + cdns_mhdp_state->current_mode = NULL; + } + + kfree(cdns_mhdp_state); +} + +static struct drm_bridge_state * +cdns_mhdp_bridge_atomic_reset(struct drm_bridge *bridge) +{ + struct cdns_mhdp_bridge_state *cdns_mhdp_state; + + cdns_mhdp_state = kzalloc(sizeof(*cdns_mhdp_state), GFP_KERNEL); + if (!cdns_mhdp_state) + return NULL; + + __drm_atomic_helper_bridge_reset(bridge, &cdns_mhdp_state->base); + + return &cdns_mhdp_state->base; +} + +static int cdns_mhdp_atomic_check(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + const struct drm_display_mode *mode = &crtc_state->adjusted_mode; + + mutex_lock(&mhdp->link_mutex); + + if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes, + mhdp->link.rate)) { + dev_err(mhdp->dev, "%s: Not enough BW for %s (%u lanes at %u Mbps)\n", + __func__, mode->name, mhdp->link.num_lanes, + mhdp->link.rate / 100); + mutex_unlock(&mhdp->link_mutex); + return -EINVAL; + } + + mutex_unlock(&mhdp->link_mutex); + return 0; +} + +static enum drm_connector_status cdns_mhdp_bridge_detect(struct drm_bridge *bridge) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + + return cdns_mhdp_detect(mhdp); +} + +static struct edid *cdns_mhdp_bridge_get_edid(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + + return cdns_mhdp_get_edid(mhdp, connector); +} + +static void cdns_mhdp_bridge_hpd_enable(struct drm_bridge *bridge) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + + /* Enable SW event interrupts */ + if (mhdp->bridge_attached) + writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT, + mhdp->regs + CDNS_APB_INT_MASK); +} + +static void cdns_mhdp_bridge_hpd_disable(struct drm_bridge *bridge) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + + writel(CDNS_APB_INT_MASK_SW_EVENT_INT, mhdp->regs + CDNS_APB_INT_MASK); +} + +static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = { + .atomic_enable = cdns_mhdp_atomic_enable, + .atomic_disable = cdns_mhdp_atomic_disable, + .atomic_check = cdns_mhdp_atomic_check, + .attach = cdns_mhdp_attach, + .detach = cdns_mhdp_detach, + .atomic_duplicate_state = cdns_mhdp_bridge_atomic_duplicate_state, + .atomic_destroy_state = cdns_mhdp_bridge_atomic_destroy_state, + .atomic_reset = cdns_mhdp_bridge_atomic_reset, + .detect = cdns_mhdp_bridge_detect, + .get_edid = cdns_mhdp_bridge_get_edid, + .hpd_enable = cdns_mhdp_bridge_hpd_enable, + .hpd_disable = cdns_mhdp_bridge_hpd_disable, +}; + +static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool *hpd_pulse) +{ + int hpd_event, hpd_status; + + *hpd_pulse = false; + + hpd_event = cdns_mhdp_read_hpd_event(mhdp); + + /* Getting event bits failed, bail out */ + if (hpd_event < 0) { + dev_warn(mhdp->dev, "%s: read event failed: %d\n", + __func__, hpd_event); + return false; + } + + hpd_status = cdns_mhdp_get_hpd_status(mhdp); + if (hpd_status < 0) { + dev_warn(mhdp->dev, "%s: get hpd status failed: %d\n", + __func__, hpd_status); + return false; + } + + if (hpd_event & DPTX_READ_EVENT_HPD_PULSE) + *hpd_pulse = true; + + return !!hpd_status; +} + +static int cdns_mhdp_update_link_status(struct cdns_mhdp_device *mhdp) +{ + struct cdns_mhdp_bridge_state *cdns_bridge_state; + struct drm_display_mode *current_mode; + bool old_plugged = mhdp->plugged; + struct drm_bridge_state *state; + u8 status[DP_LINK_STATUS_SIZE]; + bool hpd_pulse; + int ret = 0; + + mutex_lock(&mhdp->link_mutex); + + mhdp->plugged = cdns_mhdp_detect_hpd(mhdp, &hpd_pulse); + + if (!mhdp->plugged) { + cdns_mhdp_link_down(mhdp); + mhdp->link.rate = mhdp->host.link_rate; + mhdp->link.num_lanes = mhdp->host.lanes_cnt; + goto out; + } + + /* + * If we get a HPD pulse event and we were and still are connected, + * check the link status. If link status is ok, there's nothing to do + * as we don't handle DP interrupts. If link status is bad, continue + * with full link setup. + */ + if (hpd_pulse && old_plugged == mhdp->plugged) { + ret = drm_dp_dpcd_read_link_status(&mhdp->aux, status); + + /* + * If everything looks fine, just return, as we don't handle + * DP IRQs. + */ + if (ret > 0 && + drm_dp_channel_eq_ok(status, mhdp->link.num_lanes) && + drm_dp_clock_recovery_ok(status, mhdp->link.num_lanes)) + goto out; + + /* If link is bad, mark link as down so that we do a new LT */ + mhdp->link_up = false; + } + + if (!mhdp->link_up) { + ret = cdns_mhdp_link_up(mhdp); + if (ret < 0) + goto out; + } + + if (mhdp->bridge_enabled) { + state = drm_priv_to_bridge_state(mhdp->bridge.base.state); + if (!state) { + ret = -EINVAL; + goto out; + } + + cdns_bridge_state = to_cdns_mhdp_bridge_state(state); + if (!cdns_bridge_state) { + ret = -EINVAL; + goto out; + } + + current_mode = cdns_bridge_state->current_mode; + if (!current_mode) { + ret = -EINVAL; + goto out; + } + + if (!cdns_mhdp_bandwidth_ok(mhdp, current_mode, mhdp->link.num_lanes, + mhdp->link.rate)) { + ret = -EINVAL; + goto out; + } + + dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, + current_mode->name); + + cdns_mhdp_sst_enable(mhdp, current_mode); + } +out: + mutex_unlock(&mhdp->link_mutex); + return ret; +} + +static void cdns_mhdp_modeset_retry_fn(struct work_struct *work) +{ + struct cdns_mhdp_device *mhdp; + struct drm_connector *conn; + + mhdp = container_of(work, typeof(*mhdp), modeset_retry_work); + + conn = &mhdp->connector; + + /* Grab the locks before changing connector property */ + mutex_lock(&conn->dev->mode_config.mutex); + + /* + * Set connector link status to BAD and send a Uevent to notify + * userspace to do a modeset. + */ + drm_connector_set_link_status_property(conn, DRM_MODE_LINK_STATUS_BAD); + mutex_unlock(&conn->dev->mode_config.mutex); + + /* Send Hotplug uevent so userspace can reprobe */ + drm_kms_helper_hotplug_event(mhdp->bridge.dev); +} + +static irqreturn_t cdns_mhdp_irq_handler(int irq, void *data) +{ + struct cdns_mhdp_device *mhdp = data; + u32 apb_stat, sw_ev0; + bool bridge_attached; + int ret; + + apb_stat = readl(mhdp->regs + CDNS_APB_INT_STATUS); + if (!(apb_stat & CDNS_APB_INT_MASK_SW_EVENT_INT)) + return IRQ_NONE; + + sw_ev0 = readl(mhdp->regs + CDNS_SW_EVENT0); + + /* + * Calling drm_kms_helper_hotplug_event() when not attached + * to drm device causes an oops because the drm_bridge->dev + * is NULL. See cdns_mhdp_fw_cb() comments for details about the + * problems related drm_kms_helper_hotplug_event() call. + */ + spin_lock(&mhdp->start_lock); + bridge_attached = mhdp->bridge_attached; + spin_unlock(&mhdp->start_lock); + + if (bridge_attached && (sw_ev0 & CDNS_DPTX_HPD)) { + ret = cdns_mhdp_update_link_status(mhdp); + if (mhdp->connector.dev) { + if (ret < 0) + schedule_work(&mhdp->modeset_retry_work); + else + drm_kms_helper_hotplug_event(mhdp->bridge.dev); + } else { + drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp)); + } + } + + return IRQ_HANDLED; +} + +static int cdns_mhdp_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cdns_mhdp_device *mhdp; + unsigned long rate; + struct clk *clk; + int ret; + int irq; + + mhdp = devm_kzalloc(dev, sizeof(*mhdp), GFP_KERNEL); + if (!mhdp) + return -ENOMEM; + + clk = devm_clk_get(dev, NULL); + if (IS_ERR(clk)) { + dev_err(dev, "couldn't get clk: %ld\n", PTR_ERR(clk)); + return PTR_ERR(clk); + } + + mhdp->clk = clk; + mhdp->dev = dev; + mutex_init(&mhdp->mbox_mutex); + mutex_init(&mhdp->link_mutex); + spin_lock_init(&mhdp->start_lock); + + drm_dp_aux_init(&mhdp->aux); + mhdp->aux.dev = dev; + mhdp->aux.transfer = cdns_mhdp_transfer; + + mhdp->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mhdp->regs)) { + dev_err(dev, "Failed to get memory resource\n"); + return PTR_ERR(mhdp->regs); + } + + mhdp->phy = devm_of_phy_get_by_index(dev, pdev->dev.of_node, 0); + if (IS_ERR(mhdp->phy)) { + dev_err(dev, "no PHY configured\n"); + return PTR_ERR(mhdp->phy); + } + + platform_set_drvdata(pdev, mhdp); + + mhdp->info = of_device_get_match_data(dev); + + clk_prepare_enable(clk); + + pm_runtime_enable(dev); + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + dev_err(dev, "pm_runtime_get_sync failed\n"); + pm_runtime_disable(dev); + goto clk_disable; + } + + if (mhdp->info && mhdp->info->ops && mhdp->info->ops->init) { + ret = mhdp->info->ops->init(mhdp); + if (ret != 0) { + dev_err(dev, "MHDP platform initialization failed: %d\n", + ret); + goto runtime_put; + } + } + + rate = clk_get_rate(clk); + writel(rate % 1000000, mhdp->regs + CDNS_SW_CLK_L); + writel(rate / 1000000, mhdp->regs + CDNS_SW_CLK_H); + + dev_dbg(dev, "func clk rate %lu Hz\n", rate); + + writel(~0, mhdp->regs + CDNS_APB_INT_MASK); + + irq = platform_get_irq(pdev, 0); + ret = devm_request_threaded_irq(mhdp->dev, irq, NULL, + cdns_mhdp_irq_handler, IRQF_ONESHOT, + "mhdp8546", mhdp); + if (ret) { + dev_err(dev, "cannot install IRQ %d\n", irq); + ret = -EIO; + goto plat_fini; + } + + cdns_mhdp_fill_host_caps(mhdp); + + /* Initialize link rate and num of lanes to host values */ + mhdp->link.rate = mhdp->host.link_rate; + mhdp->link.num_lanes = mhdp->host.lanes_cnt; + + /* The only currently supported format */ + mhdp->display_fmt.y_only = false; + mhdp->display_fmt.color_format = DRM_COLOR_FORMAT_RGB444; + mhdp->display_fmt.bpc = 8; + + mhdp->bridge.of_node = pdev->dev.of_node; + mhdp->bridge.funcs = &cdns_mhdp_bridge_funcs; + mhdp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | + DRM_BRIDGE_OP_HPD; + mhdp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort; + if (mhdp->info) + mhdp->bridge.timings = mhdp->info->timings; + + ret = phy_init(mhdp->phy); + if (ret) { + dev_err(mhdp->dev, "Failed to initialize PHY: %d\n", ret); + goto plat_fini; + } + + /* Initialize the work for modeset in case of link train failure */ + INIT_WORK(&mhdp->modeset_retry_work, cdns_mhdp_modeset_retry_fn); + + init_waitqueue_head(&mhdp->fw_load_wq); + + ret = cdns_mhdp_load_firmware(mhdp); + if (ret) + goto phy_exit; + + drm_bridge_add(&mhdp->bridge); + + return 0; + +phy_exit: + phy_exit(mhdp->phy); +plat_fini: + if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit) + mhdp->info->ops->exit(mhdp); +runtime_put: + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); +clk_disable: + clk_disable_unprepare(mhdp->clk); + + return ret; +} + +static int cdns_mhdp_remove(struct platform_device *pdev) +{ + struct cdns_mhdp_device *mhdp = dev_get_drvdata(&pdev->dev); + unsigned long timeout = msecs_to_jiffies(100); + bool stop_fw = false; + int ret; + + drm_bridge_remove(&mhdp->bridge); + + ret = wait_event_timeout(mhdp->fw_load_wq, + mhdp->hw_state == MHDP_HW_READY, + timeout); + if (ret == 0) + dev_err(mhdp->dev, "%s: Timeout waiting for fw loading\n", + __func__); + else + stop_fw = true; + + spin_lock(&mhdp->start_lock); + mhdp->hw_state = MHDP_HW_STOPPED; + spin_unlock(&mhdp->start_lock); + + if (stop_fw) + ret = cdns_mhdp_set_firmware_active(mhdp, false); + + phy_exit(mhdp->phy); + + if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit) + mhdp->info->ops->exit(mhdp); + + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + cancel_work_sync(&mhdp->modeset_retry_work); + flush_scheduled_work(); + + clk_disable_unprepare(mhdp->clk); + + return ret; +} + +static const struct of_device_id mhdp_ids[] = { + { .compatible = "cdns,mhdp8546", }, +#ifdef CONFIG_DRM_CDNS_MHDP8546_J721E + { .compatible = "ti,j721e-mhdp8546", + .data = &(const struct cdns_mhdp_platform_info) { + .timings = &mhdp_ti_j721e_bridge_timings, + .ops = &mhdp_ti_j721e_ops, + }, + }, +#endif + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mhdp_ids); + +static struct platform_driver mhdp_driver = { + .driver = { + .name = "cdns-mhdp8546", + .of_match_table = of_match_ptr(mhdp_ids), + }, + .probe = cdns_mhdp_probe, + .remove = cdns_mhdp_remove, +}; +module_platform_driver(mhdp_driver); + +MODULE_FIRMWARE(FW_NAME); + +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); +MODULE_AUTHOR("Swapnil Jakhade <sjakhade@cadence.com>"); +MODULE_AUTHOR("Yuti Amonkar <yamonkar@cadence.com>"); +MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); +MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>"); +MODULE_DESCRIPTION("Cadence MHDP8546 DP bridge driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:cdns-mhdp8546"); |