diff options
Diffstat (limited to 'drivers/gpu/drm/mxsfb/mxsfb_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 343 |
1 files changed, 0 insertions, 343 deletions
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c deleted file mode 100644 index b69ace8bf526..000000000000 --- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c +++ /dev/null @@ -1,343 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright (C) 2016 Marek Vasut <marex@denx.de> - * - * This code is based on drivers/video/fbdev/mxsfb.c : - * Copyright (C) 2010 Juergen Beisert, Pengutronix - * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. - * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved. - */ - -#include <linux/clk.h> -#include <linux/iopoll.h> -#include <linux/of_graph.h> -#include <linux/platform_data/simplefb.h> - -#include <video/videomode.h> - -#include <drm/drm_atomic_helper.h> -#include <drm/drm_crtc.h> -#include <drm/drm_fb_cma_helper.h> -#include <drm/drm_fb_helper.h> -#include <drm/drm_gem_cma_helper.h> -#include <drm/drm_of.h> -#include <drm/drm_plane_helper.h> -#include <drm/drm_probe_helper.h> -#include <drm/drm_simple_kms_helper.h> -#include <drm/drm_vblank.h> - -#include "mxsfb_drv.h" -#include "mxsfb_regs.h" - -#define MXS_SET_ADDR 0x4 -#define MXS_CLR_ADDR 0x8 -#define MODULE_CLKGATE BIT(30) -#define MODULE_SFTRST BIT(31) -/* 1 second delay should be plenty of time for block reset */ -#define RESET_TIMEOUT 1000000 - -static u32 set_hsync_pulse_width(struct mxsfb_drm_private *mxsfb, u32 val) -{ - return (val & mxsfb->devdata->hs_wdth_mask) << - mxsfb->devdata->hs_wdth_shift; -} - -/* Setup the MXSFB registers for decoding the pixels out of the framebuffer */ -static int mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb) -{ - struct drm_crtc *crtc = &mxsfb->pipe.crtc; - struct drm_device *drm = crtc->dev; - const u32 format = crtc->primary->state->fb->format->format; - u32 ctrl, ctrl1; - - ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER; - - /* - * WARNING: The bus width, CTRL_SET_BUS_WIDTH(), is configured to - * match the selected mode here. This differs from the original - * MXSFB driver, which had the option to configure the bus width - * to arbitrary value. This limitation should not pose an issue. - */ - - /* CTRL1 contains IRQ config and status bits, preserve those. */ - ctrl1 = readl(mxsfb->base + LCDC_CTRL1); - ctrl1 &= CTRL1_CUR_FRAME_DONE_IRQ_EN | CTRL1_CUR_FRAME_DONE_IRQ; - - switch (format) { - case DRM_FORMAT_RGB565: - dev_dbg(drm->dev, "Setting up RGB565 mode\n"); - ctrl |= CTRL_SET_WORD_LENGTH(0); - ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0xf); - break; - case DRM_FORMAT_XRGB8888: - dev_dbg(drm->dev, "Setting up XRGB8888 mode\n"); - ctrl |= CTRL_SET_WORD_LENGTH(3); - /* Do not use packed pixels = one pixel per word instead. */ - ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0x7); - break; - default: - dev_err(drm->dev, "Unhandled pixel format %08x\n", format); - return -EINVAL; - } - - writel(ctrl1, mxsfb->base + LCDC_CTRL1); - writel(ctrl, mxsfb->base + LCDC_CTRL); - - return 0; -} - -static void mxsfb_set_bus_fmt(struct mxsfb_drm_private *mxsfb) -{ - struct drm_crtc *crtc = &mxsfb->pipe.crtc; - struct drm_device *drm = crtc->dev; - u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; - u32 reg; - - reg = readl(mxsfb->base + LCDC_CTRL); - - if (mxsfb->connector->display_info.num_bus_formats) - bus_format = mxsfb->connector->display_info.bus_formats[0]; - - DRM_DEV_DEBUG_DRIVER(drm->dev, "Using bus_format: 0x%08X\n", - bus_format); - - reg &= ~CTRL_BUS_WIDTH_MASK; - switch (bus_format) { - case MEDIA_BUS_FMT_RGB565_1X16: - reg |= CTRL_SET_BUS_WIDTH(STMLCDIF_16BIT); - break; - case MEDIA_BUS_FMT_RGB666_1X18: - reg |= CTRL_SET_BUS_WIDTH(STMLCDIF_18BIT); - break; - case MEDIA_BUS_FMT_RGB888_1X24: - reg |= CTRL_SET_BUS_WIDTH(STMLCDIF_24BIT); - break; - default: - dev_err(drm->dev, "Unknown media bus format %d\n", bus_format); - break; - } - writel(reg, mxsfb->base + LCDC_CTRL); -} - -static void mxsfb_enable_controller(struct mxsfb_drm_private *mxsfb) -{ - u32 reg; - - if (mxsfb->clk_disp_axi) - clk_prepare_enable(mxsfb->clk_disp_axi); - clk_prepare_enable(mxsfb->clk); - - /* If it was disabled, re-enable the mode again */ - writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_SET); - - /* Enable the SYNC signals first, then the DMA engine */ - reg = readl(mxsfb->base + LCDC_VDCTRL4); - reg |= VDCTRL4_SYNC_SIGNALS_ON; - writel(reg, mxsfb->base + LCDC_VDCTRL4); - - writel(CTRL_RUN, mxsfb->base + LCDC_CTRL + REG_SET); -} - -static void mxsfb_disable_controller(struct mxsfb_drm_private *mxsfb) -{ - u32 reg; - - /* - * Even if we disable the controller here, it will still continue - * until its FIFOs are running out of data - */ - writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_CLR); - - readl_poll_timeout(mxsfb->base + LCDC_CTRL, reg, !(reg & CTRL_RUN), - 0, 1000); - - reg = readl(mxsfb->base + LCDC_VDCTRL4); - reg &= ~VDCTRL4_SYNC_SIGNALS_ON; - writel(reg, mxsfb->base + LCDC_VDCTRL4); - - clk_disable_unprepare(mxsfb->clk); - if (mxsfb->clk_disp_axi) - clk_disable_unprepare(mxsfb->clk_disp_axi); -} - -/* - * Clear the bit and poll it cleared. This is usually called with - * a reset address and mask being either SFTRST(bit 31) or CLKGATE - * (bit 30). - */ -static int clear_poll_bit(void __iomem *addr, u32 mask) -{ - u32 reg; - - writel(mask, addr + MXS_CLR_ADDR); - return readl_poll_timeout(addr, reg, !(reg & mask), 0, RESET_TIMEOUT); -} - -static int mxsfb_reset_block(void __iomem *reset_addr) -{ - int ret; - - ret = clear_poll_bit(reset_addr, MODULE_SFTRST); - if (ret) - return ret; - - writel(MODULE_CLKGATE, reset_addr + MXS_CLR_ADDR); - - ret = clear_poll_bit(reset_addr, MODULE_SFTRST); - if (ret) - return ret; - - return clear_poll_bit(reset_addr, MODULE_CLKGATE); -} - -static dma_addr_t mxsfb_get_fb_paddr(struct mxsfb_drm_private *mxsfb) -{ - struct drm_framebuffer *fb = mxsfb->pipe.plane.state->fb; - struct drm_gem_cma_object *gem; - - if (!fb) - return 0; - - gem = drm_fb_cma_get_gem_obj(fb, 0); - if (!gem) - return 0; - - return gem->paddr; -} - -static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb) -{ - struct drm_device *drm = mxsfb->pipe.crtc.dev; - struct drm_display_mode *m = &mxsfb->pipe.crtc.state->adjusted_mode; - u32 bus_flags = mxsfb->connector->display_info.bus_flags; - u32 vdctrl0, vsync_pulse_len, hsync_pulse_len; - int err; - - /* - * It seems, you can't re-program the controller if it is still - * running. This may lead to shifted pictures (FIFO issue?), so - * first stop the controller and drain its FIFOs. - */ - - /* Mandatory eLCDIF reset as per the Reference Manual */ - err = mxsfb_reset_block(mxsfb->base); - if (err) - return; - - /* Clear the FIFOs */ - writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET); - - err = mxsfb_set_pixel_fmt(mxsfb); - if (err) - return; - - clk_set_rate(mxsfb->clk, m->crtc_clock * 1000); - - if (mxsfb->bridge && mxsfb->bridge->timings) - bus_flags = mxsfb->bridge->timings->input_bus_flags; - - DRM_DEV_DEBUG_DRIVER(drm->dev, "Pixel clock: %dkHz (actual: %dkHz)\n", - m->crtc_clock, - (int)(clk_get_rate(mxsfb->clk) / 1000)); - DRM_DEV_DEBUG_DRIVER(drm->dev, "Connector bus_flags: 0x%08X\n", - bus_flags); - DRM_DEV_DEBUG_DRIVER(drm->dev, "Mode flags: 0x%08X\n", m->flags); - - writel(TRANSFER_COUNT_SET_VCOUNT(m->crtc_vdisplay) | - TRANSFER_COUNT_SET_HCOUNT(m->crtc_hdisplay), - mxsfb->base + mxsfb->devdata->transfer_count); - - vsync_pulse_len = m->crtc_vsync_end - m->crtc_vsync_start; - - vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* Always in DOTCLOCK mode */ - VDCTRL0_VSYNC_PERIOD_UNIT | - VDCTRL0_VSYNC_PULSE_WIDTH_UNIT | - VDCTRL0_SET_VSYNC_PULSE_WIDTH(vsync_pulse_len); - if (m->flags & DRM_MODE_FLAG_PHSYNC) - vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH; - if (m->flags & DRM_MODE_FLAG_PVSYNC) - vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH; - /* Make sure Data Enable is high active by default */ - if (!(bus_flags & DRM_BUS_FLAG_DE_LOW)) - vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH; - /* - * DRM_BUS_FLAG_PIXDATA_DRIVE_ defines are controller centric, - * controllers VDCTRL0_DOTCLK is display centric. - * Drive on positive edge -> display samples on falling edge - * DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE -> VDCTRL0_DOTCLK_ACT_FALLING - */ - if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE) - vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING; - - writel(vdctrl0, mxsfb->base + LCDC_VDCTRL0); - - mxsfb_set_bus_fmt(mxsfb); - - /* Frame length in lines. */ - writel(m->crtc_vtotal, mxsfb->base + LCDC_VDCTRL1); - - /* Line length in units of clocks or pixels. */ - hsync_pulse_len = m->crtc_hsync_end - m->crtc_hsync_start; - writel(set_hsync_pulse_width(mxsfb, hsync_pulse_len) | - VDCTRL2_SET_HSYNC_PERIOD(m->crtc_htotal), - mxsfb->base + LCDC_VDCTRL2); - - writel(SET_HOR_WAIT_CNT(m->crtc_htotal - m->crtc_hsync_start) | - SET_VERT_WAIT_CNT(m->crtc_vtotal - m->crtc_vsync_start), - mxsfb->base + LCDC_VDCTRL3); - - writel(SET_DOTCLK_H_VALID_DATA_CNT(m->hdisplay), - mxsfb->base + LCDC_VDCTRL4); -} - -void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb) -{ - dma_addr_t paddr; - - mxsfb_enable_axi_clk(mxsfb); - mxsfb_crtc_mode_set_nofb(mxsfb); - - /* Write cur_buf as well to avoid an initial corrupt frame */ - paddr = mxsfb_get_fb_paddr(mxsfb); - if (paddr) { - writel(paddr, mxsfb->base + mxsfb->devdata->cur_buf); - writel(paddr, mxsfb->base + mxsfb->devdata->next_buf); - } - - mxsfb_enable_controller(mxsfb); -} - -void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb) -{ - mxsfb_disable_controller(mxsfb); - mxsfb_disable_axi_clk(mxsfb); -} - -void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb, - struct drm_plane_state *state) -{ - struct drm_simple_display_pipe *pipe = &mxsfb->pipe; - struct drm_crtc *crtc = &pipe->crtc; - struct drm_pending_vblank_event *event; - dma_addr_t paddr; - - spin_lock_irq(&crtc->dev->event_lock); - event = crtc->state->event; - if (event) { - crtc->state->event = NULL; - - if (drm_crtc_vblank_get(crtc) == 0) { - drm_crtc_arm_vblank_event(crtc, event); - } else { - drm_crtc_send_vblank_event(crtc, event); - } - } - spin_unlock_irq(&crtc->dev->event_lock); - - paddr = mxsfb_get_fb_paddr(mxsfb); - if (paddr) { - mxsfb_enable_axi_clk(mxsfb); - writel(paddr, mxsfb->base + mxsfb->devdata->next_buf); - mxsfb_disable_axi_clk(mxsfb); - } -} |