drm: Renesas R-Car Display Unit DRM driver
The R-Car Display Unit (DU) DRM driver supports both superposition
processors and all eight planes in RGB and YUV formats with alpha
blending.
Only VGA and LVDS encoders and connectors are currently supported.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
new file mode 100644
index 0000000..24183fb
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -0,0 +1,595 @@
+/*
+ * rcar_du_crtc.c -- R-Car Display Unit CRTCs
+ *
+ * Copyright (C) 2013 Renesas Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/mutex.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "rcar_du_crtc.h"
+#include "rcar_du_drv.h"
+#include "rcar_du_kms.h"
+#include "rcar_du_lvds.h"
+#include "rcar_du_plane.h"
+#include "rcar_du_regs.h"
+#include "rcar_du_vga.h"
+
+#define to_rcar_crtc(c) container_of(c, struct rcar_du_crtc, crtc)
+
+static u32 rcar_du_crtc_read(struct rcar_du_crtc *rcrtc, u32 reg)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+
+ return rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
+}
+
+static void rcar_du_crtc_write(struct rcar_du_crtc *rcrtc, u32 reg, u32 data)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+
+ rcar_du_write(rcdu, rcrtc->mmio_offset + reg, data);
+}
+
+static void rcar_du_crtc_clr(struct rcar_du_crtc *rcrtc, u32 reg, u32 clr)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+
+ rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
+ rcar_du_read(rcdu, rcrtc->mmio_offset + reg) & ~clr);
+}
+
+static void rcar_du_crtc_set(struct rcar_du_crtc *rcrtc, u32 reg, u32 set)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+
+ rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
+ rcar_du_read(rcdu, rcrtc->mmio_offset + reg) | set);
+}
+
+static void rcar_du_crtc_clr_set(struct rcar_du_crtc *rcrtc, u32 reg,
+ u32 clr, u32 set)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+ u32 value = rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
+
+ rcar_du_write(rcdu, rcrtc->mmio_offset + reg, (value & ~clr) | set);
+}
+
+static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
+{
+ struct drm_crtc *crtc = &rcrtc->crtc;
+ struct rcar_du_device *rcdu = crtc->dev->dev_private;
+ const struct drm_display_mode *mode = &crtc->mode;
+ unsigned long clk;
+ u32 value;
+ u32 div;
+
+ /* Dot clock */
+ clk = clk_get_rate(rcdu->clock);
+ div = DIV_ROUND_CLOSEST(clk, mode->clock * 1000);
+ div = clamp(div, 1U, 64U) - 1;
+
+ rcar_du_write(rcdu, rcrtc->index ? ESCR2 : ESCR,
+ ESCR_DCLKSEL_CLKS | div);
+ rcar_du_write(rcdu, rcrtc->index ? OTAR2 : OTAR, 0);
+
+ /* Signal polarities */
+ value = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : DSMR_VSL)
+ | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? 0 : DSMR_HSL)
+ | DSMR_DIPM_DE;
+ rcar_du_crtc_write(rcrtc, DSMR, value);
+
+ /* Display timings */
+ rcar_du_crtc_write(rcrtc, HDSR, mode->htotal - mode->hsync_start - 19);
+ rcar_du_crtc_write(rcrtc, HDER, mode->htotal - mode->hsync_start +
+ mode->hdisplay - 19);
+ rcar_du_crtc_write(rcrtc, HSWR, mode->hsync_end -
+ mode->hsync_start - 1);
+ rcar_du_crtc_write(rcrtc, HCR, mode->htotal - 1);
+
+ rcar_du_crtc_write(rcrtc, VDSR, mode->vtotal - mode->vsync_end - 2);
+ rcar_du_crtc_write(rcrtc, VDER, mode->vtotal - mode->vsync_end +
+ mode->vdisplay - 2);
+ rcar_du_crtc_write(rcrtc, VSPR, mode->vtotal - mode->vsync_end +
+ mode->vsync_start - 1);
+ rcar_du_crtc_write(rcrtc, VCR, mode->vtotal - 1);
+
+ rcar_du_crtc_write(rcrtc, DESR, mode->htotal - mode->hsync_start);
+ rcar_du_crtc_write(rcrtc, DEWR, mode->hdisplay);
+}
+
+static void rcar_du_crtc_set_routing(struct rcar_du_crtc *rcrtc)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+ u32 dorcr = rcar_du_read(rcdu, DORCR);
+
+ dorcr &= ~(DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_MASK);
+
+ /* Set the DU1 pins sources. Select CRTC 0 if explicitly requested and
+ * CRTC 1 in all other cases to avoid cloning CRTC 0 to DU0 and DU1 by
+ * default.
+ */
+ if (rcrtc->outputs & (1 << 1) && rcrtc->index == 0)
+ dorcr |= DORCR_PG2D_DS1;
+ else
+ dorcr |= DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_DS2;
+
+ rcar_du_write(rcdu, DORCR, dorcr);
+}
+
+static void __rcar_du_start_stop(struct rcar_du_device *rcdu, bool start)
+{
+ rcar_du_write(rcdu, DSYSR,
+ (rcar_du_read(rcdu, DSYSR) & ~(DSYSR_DRES | DSYSR_DEN)) |
+ (start ? DSYSR_DEN : DSYSR_DRES));
+}
+
+static void rcar_du_start_stop(struct rcar_du_device *rcdu, bool start)
+{
+ /* Many of the configuration bits are only updated when the display
+ * reset (DRES) bit in DSYSR is set to 1, disabling *both* CRTCs. Some
+ * of those bits could be pre-configured, but others (especially the
+ * bits related to plane assignment to display timing controllers) need
+ * to be modified at runtime.
+ *
+ * Restart the display controller if a start is requested. Sorry for the
+ * flicker. It should be possible to move most of the "DRES-update" bits
+ * setup to driver initialization time and minimize the number of cases
+ * when the display controller will have to be restarted.
+ */
+ if (start) {
+ if (rcdu->used_crtcs++ != 0)
+ __rcar_du_start_stop(rcdu, false);
+ __rcar_du_start_stop(rcdu, true);
+ } else {
+ if (--rcdu->used_crtcs == 0)
+ __rcar_du_start_stop(rcdu, false);
+ }
+}
+
+void rcar_du_crtc_route_output(struct drm_crtc *crtc, unsigned int output)
+{
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ /* Store the route from the CRTC output to the DU output. The DU will be
+ * configured when starting the CRTC.
+ */
+ rcrtc->outputs |= 1 << output;
+}
+
+void rcar_du_crtc_update_planes(struct drm_crtc *crtc)
+{
+ struct rcar_du_device *rcdu = crtc->dev->dev_private;
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+ struct rcar_du_plane *planes[RCAR_DU_NUM_HW_PLANES];
+ unsigned int num_planes = 0;
+ unsigned int prio = 0;
+ unsigned int i;
+ u32 dptsr = 0;
+ u32 dspr = 0;
+
+ for (i = 0; i < ARRAY_SIZE(rcdu->planes.planes); ++i) {
+ struct rcar_du_plane *plane = &rcdu->planes.planes[i];
+ unsigned int j;
+
+ if (plane->crtc != &rcrtc->crtc || !plane->enabled)
+ continue;
+
+ /* Insert the plane in the sorted planes array. */
+ for (j = num_planes++; j > 0; --j) {
+ if (planes[j-1]->zpos <= plane->zpos)
+ break;
+ planes[j] = planes[j-1];
+ }
+
+ planes[j] = plane;
+ prio += plane->format->planes * 4;
+ }
+
+ for (i = 0; i < num_planes; ++i) {
+ struct rcar_du_plane *plane = planes[i];
+ unsigned int index = plane->hwindex;
+
+ prio -= 4;
+ dspr |= (index + 1) << prio;
+ dptsr |= DPTSR_PnDK(index) | DPTSR_PnTS(index);
+
+ if (plane->format->planes == 2) {
+ index = (index + 1) % 8;
+
+ prio -= 4;
+ dspr |= (index + 1) << prio;
+ dptsr |= DPTSR_PnDK(index) | DPTSR_PnTS(index);
+ }
+ }
+
+ /* Select display timing and dot clock generator 2 for planes associated
+ * with superposition controller 2.
+ */
+ if (rcrtc->index) {
+ u32 value = rcar_du_read(rcdu, DPTSR);
+
+ /* The DPTSR register is updated when the display controller is
+ * stopped. We thus need to restart the DU. Once again, sorry
+ * for the flicker. One way to mitigate the issue would be to
+ * pre-associate planes with CRTCs (either with a fixed 4/4
+ * split, or through a module parameter). Flicker would then
+ * occur only if we need to break the pre-association.
+ */
+ if (value != dptsr) {
+ rcar_du_write(rcdu, DPTSR, dptsr);
+ if (rcdu->used_crtcs) {
+ __rcar_du_start_stop(rcdu, false);
+ __rcar_du_start_stop(rcdu, true);
+ }
+ }
+ }
+
+ rcar_du_write(rcdu, rcrtc->index ? DS2PR : DS1PR, dspr);
+}
+
+static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
+{
+ struct drm_crtc *crtc = &rcrtc->crtc;
+ struct rcar_du_device *rcdu = crtc->dev->dev_private;
+ unsigned int i;
+
+ if (rcrtc->started)
+ return;
+
+ if (WARN_ON(rcrtc->plane->format == NULL))
+ return;
+
+ /* Set display off and background to black */
+ rcar_du_crtc_write(rcrtc, DOOR, DOOR_RGB(0, 0, 0));
+ rcar_du_crtc_write(rcrtc, BPOR, BPOR_RGB(0, 0, 0));
+
+ /* Configure display timings and output routing */
+ rcar_du_crtc_set_display_timing(rcrtc);
+ rcar_du_crtc_set_routing(rcrtc);
+
+ mutex_lock(&rcdu->planes.lock);
+ rcrtc->plane->enabled = true;
+ rcar_du_crtc_update_planes(crtc);
+ mutex_unlock(&rcdu->planes.lock);
+
+ /* Setup planes. */
+ for (i = 0; i < ARRAY_SIZE(rcdu->planes.planes); ++i) {
+ struct rcar_du_plane *plane = &rcdu->planes.planes[i];
+
+ if (plane->crtc != crtc || !plane->enabled)
+ continue;
+
+ rcar_du_plane_setup(plane);
+ }
+
+ /* Select master sync mode. This enables display operation in master
+ * sync mode (with the HSYNC and VSYNC signals configured as outputs and
+ * actively driven).
+ */
+ rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK, DSYSR_TVM_MASTER);
+
+ rcar_du_start_stop(rcdu, true);
+
+ rcrtc->started = true;
+}
+
+static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
+{
+ struct drm_crtc *crtc = &rcrtc->crtc;
+ struct rcar_du_device *rcdu = crtc->dev->dev_private;
+
+ if (!rcrtc->started)
+ return;
+
+ mutex_lock(&rcdu->planes.lock);
+ rcrtc->plane->enabled = false;
+ rcar_du_crtc_update_planes(crtc);
+ mutex_unlock(&rcdu->planes.lock);
+
+ /* Select switch sync mode. This stops display operation and configures
+ * the HSYNC and VSYNC signals as inputs.
+ */
+ rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK, DSYSR_TVM_SWITCH);
+
+ rcar_du_start_stop(rcdu, false);
+
+ rcrtc->started = false;
+}
+
+void rcar_du_crtc_suspend(struct rcar_du_crtc *rcrtc)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+
+ rcar_du_crtc_stop(rcrtc);
+ rcar_du_put(rcdu);
+}
+
+void rcar_du_crtc_resume(struct rcar_du_crtc *rcrtc)
+{
+ struct rcar_du_device *rcdu = rcrtc->crtc.dev->dev_private;
+
+ if (rcrtc->dpms != DRM_MODE_DPMS_ON)
+ return;
+
+ rcar_du_get(rcdu);
+ rcar_du_crtc_start(rcrtc);
+}
+
+static void rcar_du_crtc_update_base(struct rcar_du_crtc *rcrtc)
+{
+ struct drm_crtc *crtc = &rcrtc->crtc;
+
+ rcar_du_plane_compute_base(rcrtc->plane, crtc->fb);
+ rcar_du_plane_update_base(rcrtc->plane);
+}
+
+static void rcar_du_crtc_dpms(struct drm_crtc *crtc, int mode)
+{
+ struct rcar_du_device *rcdu = crtc->dev->dev_private;
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ if (rcrtc->dpms == mode)
+ return;
+
+ if (mode == DRM_MODE_DPMS_ON) {
+ rcar_du_get(rcdu);
+ rcar_du_crtc_start(rcrtc);
+ } else {
+ rcar_du_crtc_stop(rcrtc);
+ rcar_du_put(rcdu);
+ }
+
+ rcrtc->dpms = mode;
+}
+
+static bool rcar_du_crtc_mode_fixup(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ /* TODO Fixup modes */
+ return true;
+}
+
+static void rcar_du_crtc_mode_prepare(struct drm_crtc *crtc)
+{
+ struct rcar_du_device *rcdu = crtc->dev->dev_private;
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ /* We need to access the hardware during mode set, acquire a reference
+ * to the DU.
+ */
+ rcar_du_get(rcdu);
+
+ /* Stop the CRTC and release the plane. Force the DPMS mode to off as a
+ * result.
+ */
+ rcar_du_crtc_stop(rcrtc);
+ rcar_du_plane_release(rcrtc->plane);
+
+ rcrtc->dpms = DRM_MODE_DPMS_OFF;
+}
+
+static int rcar_du_crtc_mode_set(struct drm_crtc *crtc,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode,
+ int x, int y,
+ struct drm_framebuffer *old_fb)
+{
+ struct rcar_du_device *rcdu = crtc->dev->dev_private;
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+ const struct rcar_du_format_info *format;
+ int ret;
+
+ format = rcar_du_format_info(crtc->fb->pixel_format);
+ if (format == NULL) {
+ dev_dbg(rcdu->dev, "mode_set: unsupported format %08x\n",
+ crtc->fb->pixel_format);
+ ret = -EINVAL;
+ goto error;
+ }
+
+ ret = rcar_du_plane_reserve(rcrtc->plane, format);
+ if (ret < 0)
+ goto error;
+
+ rcrtc->plane->format = format;
+ rcrtc->plane->pitch = crtc->fb->pitches[0];
+
+ rcrtc->plane->src_x = x;
+ rcrtc->plane->src_y = y;
+ rcrtc->plane->width = mode->hdisplay;
+ rcrtc->plane->height = mode->vdisplay;
+
+ rcar_du_plane_compute_base(rcrtc->plane, crtc->fb);
+
+ rcrtc->outputs = 0;
+
+ return 0;
+
+error:
+ /* There's no rollback/abort operation to clean up in case of error. We
+ * thus need to release the reference to the DU acquired in prepare()
+ * here.
+ */
+ rcar_du_put(rcdu);
+ return ret;
+}
+
+static void rcar_du_crtc_mode_commit(struct drm_crtc *crtc)
+{
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ /* We're done, restart the CRTC and set the DPMS mode to on. The
+ * reference to the DU acquired at prepare() time will thus be released
+ * by the DPMS handler (possibly called by the disable() handler).
+ */
+ rcar_du_crtc_start(rcrtc);
+ rcrtc->dpms = DRM_MODE_DPMS_ON;
+}
+
+static int rcar_du_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
+ struct drm_framebuffer *old_fb)
+{
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ rcrtc->plane->src_x = x;
+ rcrtc->plane->src_y = y;
+
+ rcar_du_crtc_update_base(to_rcar_crtc(crtc));
+
+ return 0;
+}
+
+static void rcar_du_crtc_disable(struct drm_crtc *crtc)
+{
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+ rcar_du_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+ rcar_du_plane_release(rcrtc->plane);
+}
+
+static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
+ .dpms = rcar_du_crtc_dpms,
+ .mode_fixup = rcar_du_crtc_mode_fixup,
+ .prepare = rcar_du_crtc_mode_prepare,
+ .commit = rcar_du_crtc_mode_commit,
+ .mode_set = rcar_du_crtc_mode_set,
+ .mode_set_base = rcar_du_crtc_mode_set_base,
+ .disable = rcar_du_crtc_disable,
+};
+
+void rcar_du_crtc_cancel_page_flip(struct rcar_du_crtc *rcrtc,
+ struct drm_file *file)
+{
+ struct drm_pending_vblank_event *event;
+ struct drm_device *dev = rcrtc->crtc.dev;
+ unsigned long flags;
+
+ /* Destroy the pending vertical blanking event associated with the
+ * pending page flip, if any, and disable vertical blanking interrupts.
+ */
+ spin_lock_irqsave(&dev->event_lock, flags);
+ event = rcrtc->event;
+ if (event && event->base.file_priv == file) {
+ rcrtc->event = NULL;
+ event->base.destroy(&event->base);
+ drm_vblank_put(dev, rcrtc->index);
+ }
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+static void rcar_du_crtc_finish_page_flip(struct rcar_du_crtc *rcrtc)
+{
+ struct drm_pending_vblank_event *event;
+ struct drm_device *dev = rcrtc->crtc.dev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->event_lock, flags);
+ event = rcrtc->event;
+ rcrtc->event = NULL;
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+
+ if (event == NULL)
+ return;
+
+ spin_lock_irqsave(&dev->event_lock, flags);
+ drm_send_vblank_event(dev, rcrtc->index, event);
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+
+ drm_vblank_put(dev, rcrtc->index);
+}
+
+static int rcar_du_crtc_page_flip(struct drm_crtc *crtc,
+ struct drm_framebuffer *fb,
+ struct drm_pending_vblank_event *event)
+{
+ struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+ struct drm_device *dev = rcrtc->crtc.dev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->event_lock, flags);
+ if (rcrtc->event != NULL) {
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+ return -EBUSY;
+ }
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+
+ crtc->fb = fb;
+ rcar_du_crtc_update_base(rcrtc);
+
+ if (event) {
+ event->pipe = rcrtc->index;
+ drm_vblank_get(dev, rcrtc->index);
+ spin_lock_irqsave(&dev->event_lock, flags);
+ rcrtc->event = event;
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+ }
+
+ return 0;
+}
+
+static const struct drm_crtc_funcs crtc_funcs = {
+ .destroy = drm_crtc_cleanup,
+ .set_config = drm_crtc_helper_set_config,
+ .page_flip = rcar_du_crtc_page_flip,
+};
+
+int rcar_du_crtc_create(struct rcar_du_device *rcdu, unsigned int index)
+{
+ struct rcar_du_crtc *rcrtc = &rcdu->crtcs[index];
+ struct drm_crtc *crtc = &rcrtc->crtc;
+ int ret;
+
+ rcrtc->mmio_offset = index ? DISP2_REG_OFFSET : 0;
+ rcrtc->index = index;
+ rcrtc->dpms = DRM_MODE_DPMS_OFF;
+ rcrtc->plane = &rcdu->planes.planes[index];
+
+ rcrtc->plane->crtc = crtc;
+
+ ret = drm_crtc_init(rcdu->ddev, crtc, &crtc_funcs);
+ if (ret < 0)
+ return ret;
+
+ drm_crtc_helper_add(crtc, &crtc_helper_funcs);
+
+ return 0;
+}
+
+void rcar_du_crtc_enable_vblank(struct rcar_du_crtc *rcrtc, bool enable)
+{
+ if (enable) {
+ rcar_du_crtc_write(rcrtc, DSRCR, DSRCR_VBCL);
+ rcar_du_crtc_set(rcrtc, DIER, DIER_VBE);
+ } else {
+ rcar_du_crtc_clr(rcrtc, DIER, DIER_VBE);
+ }
+}
+
+void rcar_du_crtc_irq(struct rcar_du_crtc *rcrtc)
+{
+ u32 status;
+
+ status = rcar_du_crtc_read(rcrtc, DSSR);
+ rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
+
+ if (status & DSSR_VBK) {
+ drm_handle_vblank(rcrtc->crtc.dev, rcrtc->index);
+ rcar_du_crtc_finish_page_flip(rcrtc);
+ }
+}