diff options
Diffstat (limited to 'drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c')
| -rw-r--r-- | drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c new file mode 100644 index 000000000000..d06832e62e96 --- /dev/null +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// Copyright (c) 2024 Hisilicon Limited. + +#include <linux/io.h> + +#include <drm/drm_probe_helper.h> +#include <drm/drm_simple_kms_helper.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_modes.h> +#include <drm/drm_drv.h> +#include <drm/drm_edid.h> + +#include "hibmc_drm_drv.h" +#include "dp/dp_hw.h" + +#define DP_MASKED_SINK_HPD_PLUG_INT BIT(2) + +static int hibmc_dp_connector_get_modes(struct drm_connector *connector) +{ + const struct drm_edid *drm_edid; + int count; + + drm_edid = drm_edid_read(connector); + + drm_edid_connector_update(connector, drm_edid); + + count = drm_edid_connector_add_modes(connector); + + drm_edid_free(drm_edid); + + return count; +} + +static int hibmc_dp_detect(struct drm_connector *connector, + struct drm_modeset_acquire_ctx *ctx, bool force) +{ + mdelay(200); + + return drm_connector_helper_detect_from_ddc(connector, ctx, force); +} + +static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = { + .get_modes = hibmc_dp_connector_get_modes, + .detect_ctx = hibmc_dp_detect, +}; + +static int hibmc_dp_late_register(struct drm_connector *connector) +{ + struct hibmc_dp *dp = to_hibmc_dp(connector); + + hibmc_dp_enable_int(dp); + + return drm_dp_aux_register(&dp->aux); +} + +static void hibmc_dp_early_unregister(struct drm_connector *connector) +{ + struct hibmc_dp *dp = to_hibmc_dp(connector); + + drm_dp_aux_unregister(&dp->aux); + + hibmc_dp_disable_int(dp); +} + +static const struct drm_connector_funcs hibmc_dp_conn_funcs = { + .reset = drm_atomic_helper_connector_reset, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = drm_connector_cleanup, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, + .late_register = hibmc_dp_late_register, + .early_unregister = hibmc_dp_early_unregister, + .debugfs_init = hibmc_debugfs_init, +}; + +static inline int hibmc_dp_prepare(struct hibmc_dp *dp, struct drm_display_mode *mode) +{ + int ret; + + hibmc_dp_display_en(dp, false); + + ret = hibmc_dp_mode_set(dp, mode); + if (ret) + drm_err(dp->drm_dev, "hibmc dp mode set failed: %d\n", ret); + + return ret; +} + +static void hibmc_dp_encoder_enable(struct drm_encoder *drm_encoder, + struct drm_atomic_state *state) +{ + struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder); + struct drm_display_mode *mode = &drm_encoder->crtc->state->mode; + + if (hibmc_dp_prepare(dp, mode)) + return; + + hibmc_dp_display_en(dp, true); +} + +static void hibmc_dp_encoder_disable(struct drm_encoder *drm_encoder, + struct drm_atomic_state *state) +{ + struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder); + + hibmc_dp_display_en(dp, false); +} + +static const struct drm_encoder_helper_funcs hibmc_dp_encoder_helper_funcs = { + .atomic_enable = hibmc_dp_encoder_enable, + .atomic_disable = hibmc_dp_encoder_disable, +}; + +irqreturn_t hibmc_dp_hpd_isr(int irq, void *arg) +{ + struct drm_device *dev = (struct drm_device *)arg; + struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); + int idx; + + if (!drm_dev_enter(dev, &idx)) + return -ENODEV; + + if (priv->dp.irq_status & DP_MASKED_SINK_HPD_PLUG_INT) { + drm_dbg_dp(&priv->dev, "HPD IN isr occur!\n"); + hibmc_dp_hpd_cfg(&priv->dp); + } else { + drm_dbg_dp(&priv->dev, "HPD OUT isr occur!\n"); + hibmc_dp_reset_link(&priv->dp); + } + + if (dev->registered) + drm_connector_helper_hpd_irq_event(&priv->dp.connector); + + drm_dev_exit(idx); + + return IRQ_HANDLED; +} + +int hibmc_dp_init(struct hibmc_drm_private *priv) +{ + struct drm_device *dev = &priv->dev; + struct drm_crtc *crtc = &priv->crtc; + struct hibmc_dp *dp = &priv->dp; + struct drm_connector *connector = &dp->connector; + struct drm_encoder *encoder = &dp->encoder; + int ret; + + dp->mmio = priv->mmio; + dp->drm_dev = dev; + + ret = hibmc_dp_hw_init(&priv->dp); + if (ret) { + drm_err(dev, "hibmc dp hw init failed: %d\n", ret); + return ret; + } + + hibmc_dp_display_en(&priv->dp, false); + + encoder->possible_crtcs = drm_crtc_mask(crtc); + ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_TMDS, NULL); + if (ret) { + drm_err(dev, "init dp encoder failed: %d\n", ret); + return ret; + } + + drm_encoder_helper_add(encoder, &hibmc_dp_encoder_helper_funcs); + + ret = drm_connector_init_with_ddc(dev, connector, &hibmc_dp_conn_funcs, + DRM_MODE_CONNECTOR_DisplayPort, &dp->aux.ddc); + if (ret) { + drm_err(dev, "init dp connector failed: %d\n", ret); + return ret; + } + + drm_connector_helper_add(connector, &hibmc_dp_conn_helper_funcs); + + drm_connector_attach_encoder(connector, encoder); + + connector->polled = DRM_CONNECTOR_POLL_HPD; + + return 0; +} |