// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2016 Marek Vasut * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mxsfb_drv.h" #include "mxsfb_regs.h" /* 1 second delay should be plenty of time for block reset */ #define RESET_TIMEOUT 1000000 /* ----------------------------------------------------------------------------- * CRTC */ 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 and * outputting them on the bus. */ static void mxsfb_set_formats(struct mxsfb_drm_private *mxsfb) { struct drm_device *drm = mxsfb->drm; const u32 format = mxsfb->crtc.primary->state->fb->format->format; u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; u32 ctrl, ctrl1; 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); ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER; /* 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_WORD_LENGTH_16; ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0xf); break; case DRM_FORMAT_XRGB8888: dev_dbg(drm->dev, "Setting up XRGB8888 mode\n"); ctrl |= CTRL_WORD_LENGTH_24; /* Do not use packed pixels = one pixel per word instead. */ ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0x7); break; } switch (bus_format) { case MEDIA_BUS_FMT_RGB565_1X16: ctrl |= CTRL_BUS_WIDTH_16; break; case MEDIA_BUS_FMT_RGB666_1X18: ctrl |= CTRL_BUS_WIDTH_18; break; case MEDIA_BUS_FMT_RGB888_1X24: ctrl |= CTRL_BUS_WIDTH_24; break; default: dev_err(drm->dev, "Unknown media bus format %d\n", bus_format); break; } writel(ctrl1, mxsfb->base + LCDC_CTRL1); writel(ctrl, 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 + REG_CLR); return readl_poll_timeout(addr, reg, !(reg & mask), 0, RESET_TIMEOUT); } static int mxsfb_reset_block(struct mxsfb_drm_private *mxsfb) { int ret; ret = clear_poll_bit(mxsfb->base + LCDC_CTRL, CTRL_SFTRST); if (ret) return ret; writel(CTRL_CLKGATE, mxsfb->base + LCDC_CTRL + REG_CLR); ret = clear_poll_bit(mxsfb->base + LCDC_CTRL, CTRL_SFTRST); if (ret) return ret; return clear_poll_bit(mxsfb->base + LCDC_CTRL, CTRL_CLKGATE); } static dma_addr_t mxsfb_get_fb_paddr(struct drm_plane *plane) { struct drm_framebuffer *fb = 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->crtc.dev; struct drm_display_mode *m = &mxsfb->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); if (err) return; /* Clear the FIFOs */ writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET); if (mxsfb->devdata->has_overlay) writel(0, mxsfb->base + LCDC_AS_CTRL); mxsfb_set_formats(mxsfb); 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); /* 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); } static int mxsfb_crtc_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state) { struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); bool has_primary = crtc_state->plane_mask & drm_plane_mask(crtc->primary); /* The primary plane has to be enabled when the CRTC is active. */ if (crtc_state->active && !has_primary) return -EINVAL; /* TODO: Is this needed ? */ return drm_atomic_add_affected_planes(state, crtc); } static void mxsfb_crtc_atomic_flush(struct drm_crtc *crtc, struct drm_atomic_state *state) { struct drm_pending_vblank_event *event; event = crtc->state->event; crtc->state->event = NULL; if (!event) return; spin_lock_irq(&crtc->dev->event_lock); 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); } static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state) { struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); struct drm_device *drm = mxsfb->drm; dma_addr_t paddr; pm_runtime_get_sync(drm->dev); mxsfb_enable_axi_clk(mxsfb); drm_crtc_vblank_on(crtc); mxsfb_crtc_mode_set_nofb(mxsfb); /* Write cur_buf as well to avoid an initial corrupt frame */ paddr = mxsfb_get_fb_paddr(crtc->primary); if (paddr) { writel(paddr, mxsfb->base + mxsfb->devdata->cur_buf); writel(paddr, mxsfb->base + mxsfb->devdata->next_buf); } mxsfb_enable_controller(mxsfb); } static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state) { struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); struct drm_device *drm = mxsfb->drm; struct drm_pending_vblank_event *event; mxsfb_disable_controller(mxsfb); spin_lock_irq(&drm->event_lock); event = crtc->state->event; if (event) { crtc->state->event = NULL; drm_crtc_send_vblank_event(crtc, event); } spin_unlock_irq(&drm->event_lock); drm_crtc_vblank_off(crtc); mxsfb_disable_axi_clk(mxsfb); pm_runtime_put_sync(drm->dev); } static int mxsfb_crtc_enable_vblank(struct drm_crtc *crtc) { struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); /* Clear and enable VBLANK IRQ */ writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET); return 0; } static void mxsfb_crtc_disable_vblank(struct drm_crtc *crtc) { struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); /* Disable and clear VBLANK IRQ */ writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); } static const struct drm_crtc_helper_funcs mxsfb_crtc_helper_funcs = { .atomic_check = mxsfb_crtc_atomic_check, .atomic_flush = mxsfb_crtc_atomic_flush, .atomic_enable = mxsfb_crtc_atomic_enable, .atomic_disable = mxsfb_crtc_atomic_disable, }; static const struct drm_crtc_funcs mxsfb_crtc_funcs = { .reset = drm_atomic_helper_crtc_reset, .destroy = drm_crtc_cleanup, .set_config = drm_atomic_helper_set_config, .page_flip = drm_atomic_helper_page_flip, .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, .enable_vblank = mxsfb_crtc_enable_vblank, .disable_vblank = mxsfb_crtc_disable_vblank, }; /* ----------------------------------------------------------------------------- * Encoder */ static const struct drm_encoder_funcs mxsfb_encoder_funcs = { .destroy = drm_encoder_cleanup, }; /* ----------------------------------------------------------------------------- * Planes */ static int mxsfb_plane_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state) { struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane); struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); struct drm_crtc_state *crtc_state; crtc_state = drm_atomic_get_new_crtc_state(state, &mxsfb->crtc); return drm_atomic_helper_check_plane_state(plane_state, crtc_state, DRM_PLANE_HELPER_NO_SCALING, DRM_PLANE_HELPER_NO_SCALING, false, true); } static void mxsfb_plane_primary_atomic_update(struct drm_plane *plane, struct drm_atomic_state *state) { struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); dma_addr_t paddr; paddr = mxsfb_get_fb_paddr(plane); if (paddr) writel(paddr, mxsfb->base + mxsfb->devdata->next_buf); } static void mxsfb_plane_overlay_atomic_update(struct drm_plane *plane, struct drm_atomic_state *state) { struct drm_plane_state *old_pstate = drm_atomic_get_old_plane_state(state, plane); struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); struct drm_plane_state *new_pstate = drm_atomic_get_new_plane_state(state, plane); dma_addr_t paddr; u32 ctrl; paddr = mxsfb_get_fb_paddr(plane); if (!paddr) { writel(0, mxsfb->base + LCDC_AS_CTRL); return; } /* * HACK: The hardware seems to output 64 bytes of data of unknown * origin, and then to proceed with the framebuffer. Until the reason * is understood, live with the 16 initial invalid pixels on the first * line and start 64 bytes within the framebuffer. */ paddr += 64; writel(paddr, mxsfb->base + LCDC_AS_NEXT_BUF); /* * If the plane was previously disabled, write LCDC_AS_BUF as well to * provide the first buffer. */ if (!old_pstate->fb) writel(paddr, mxsfb->base + LCDC_AS_BUF); ctrl = AS_CTRL_AS_ENABLE | AS_CTRL_ALPHA(255); switch (new_pstate->fb->format->format) { case DRM_FORMAT_XRGB4444: ctrl |= AS_CTRL_FORMAT_RGB444 | AS_CTRL_ALPHA_CTRL_OVERRIDE; break; case DRM_FORMAT_ARGB4444: ctrl |= AS_CTRL_FORMAT_ARGB4444 | AS_CTRL_ALPHA_CTRL_EMBEDDED; break; case DRM_FORMAT_XRGB1555: ctrl |= AS_CTRL_FORMAT_RGB555 | AS_CTRL_ALPHA_CTRL_OVERRIDE; break; case DRM_FORMAT_ARGB1555: ctrl |= AS_CTRL_FORMAT_ARGB1555 | AS_CTRL_ALPHA_CTRL_EMBEDDED; break; case DRM_FORMAT_RGB565: ctrl |= AS_CTRL_FORMAT_RGB565 | AS_CTRL_ALPHA_CTRL_OVERRIDE; break; case DRM_FORMAT_XRGB8888: ctrl |= AS_CTRL_FORMAT_RGB888 | AS_CTRL_ALPHA_CTRL_OVERRIDE; break; case DRM_FORMAT_ARGB8888: ctrl |= AS_CTRL_FORMAT_ARGB8888 | AS_CTRL_ALPHA_CTRL_EMBEDDED; break; } writel(ctrl, mxsfb->base + LCDC_AS_CTRL); } static bool mxsfb_format_mod_supported(struct drm_plane *plane, uint32_t format, uint64_t modifier) { return modifier == DRM_FORMAT_MOD_LINEAR; } static const struct drm_plane_helper_funcs mxsfb_plane_primary_helper_funcs = { .prepare_fb = drm_gem_plane_helper_prepare_fb, .atomic_check = mxsfb_plane_atomic_check, .atomic_update = mxsfb_plane_primary_atomic_update, }; static const struct drm_plane_helper_funcs mxsfb_plane_overlay_helper_funcs = { .prepare_fb = drm_gem_plane_helper_prepare_fb, .atomic_check = mxsfb_plane_atomic_check, .atomic_update = mxsfb_plane_overlay_atomic_update, }; static const struct drm_plane_funcs mxsfb_plane_funcs = { .format_mod_supported = mxsfb_format_mod_supported, .update_plane = drm_atomic_helper_update_plane, .disable_plane = drm_atomic_helper_disable_plane, .destroy = drm_plane_cleanup, .reset = drm_atomic_helper_plane_reset, .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, }; static const uint32_t mxsfb_primary_plane_formats[] = { DRM_FORMAT_RGB565, DRM_FORMAT_XRGB8888, }; static const uint32_t mxsfb_overlay_plane_formats[] = { DRM_FORMAT_XRGB4444, DRM_FORMAT_ARGB4444, DRM_FORMAT_XRGB1555, DRM_FORMAT_ARGB1555, DRM_FORMAT_RGB565, DRM_FORMAT_XRGB8888, DRM_FORMAT_ARGB8888, }; static const uint64_t mxsfb_modifiers[] = { DRM_FORMAT_MOD_LINEAR, DRM_FORMAT_MOD_INVALID }; /* ----------------------------------------------------------------------------- * Initialization */ int mxsfb_kms_init(struct mxsfb_drm_private *mxsfb) { struct drm_encoder *encoder = &mxsfb->encoder; struct drm_crtc *crtc = &mxsfb->crtc; int ret; drm_plane_helper_add(&mxsfb->planes.primary, &mxsfb_plane_primary_helper_funcs); ret = drm_universal_plane_init(mxsfb->drm, &mxsfb->planes.primary, 1, &mxsfb_plane_funcs, mxsfb_primary_plane_formats, ARRAY_SIZE(mxsfb_primary_plane_formats), mxsfb_modifiers, DRM_PLANE_TYPE_PRIMARY, NULL); if (ret) return ret; if (mxsfb->devdata->has_overlay) { drm_plane_helper_add(&mxsfb->planes.overlay, &mxsfb_plane_overlay_helper_funcs); ret = drm_universal_plane_init(mxsfb->drm, &mxsfb->planes.overlay, 1, &mxsfb_plane_funcs, mxsfb_overlay_plane_formats, ARRAY_SIZE(mxsfb_overlay_plane_formats), mxsfb_modifiers, DRM_PLANE_TYPE_OVERLAY, NULL); if (ret) return ret; } drm_crtc_helper_add(crtc, &mxsfb_crtc_helper_funcs); ret = drm_crtc_init_with_planes(mxsfb->drm, crtc, &mxsfb->planes.primary, NULL, &mxsfb_crtc_funcs, NULL); if (ret) return ret; encoder->possible_crtcs = drm_crtc_mask(crtc); return drm_encoder_init(mxsfb->drm, encoder, &mxsfb_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL); }