From: Thierry Reding <tred...@nvidia.com>
Provide a custom ->atomic_commit() implementation which supports async
commits. The generic atomic page-flip helper can use this to implement
page-flipping.
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
drivers/gpu/drm/tegra/dc.c | 129 ++++----------------------------------------
drivers/gpu/drm/tegra/drm.c | 84 ++++++++++++++++++++++++++++-
drivers/gpu/drm/tegra/drm.h | 6 +++
3 files changed, 100 insertions(+), 119 deletions(-)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 9a934a6077a6..52ae563cb531 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -827,99 +827,6 @@ static int tegra_dc_add_planes(struct drm_device *drm,
struct tegra_dc *dc)
return 0;
}
-static int tegra_dc_set_base(struct tegra_dc *dc, int x, int y,
- struct drm_framebuffer *fb)
-{
- struct tegra_bo *bo = tegra_fb_get_plane(fb, 0);
- unsigned int h_offset = 0, v_offset = 0;
- struct tegra_bo_tiling tiling;
- unsigned long value, flags;
- unsigned int format, swap;
- int err;
-
- err = tegra_fb_get_tiling(fb, &tiling);
- if (err < 0)
- return err;
-
- spin_lock_irqsave(&dc->lock, flags);
-
- tegra_dc_writel(dc, WINDOW_A_SELECT, DC_CMD_DISPLAY_WINDOW_HEADER);
-
- value = fb->offsets[0] + y * fb->pitches[0] +
- x * fb->bits_per_pixel / 8;
-
- tegra_dc_writel(dc, bo->paddr + value, DC_WINBUF_START_ADDR);
- tegra_dc_writel(dc, fb->pitches[0], DC_WIN_LINE_STRIDE);
-
- format = tegra_dc_format(fb->pixel_format, &swap);
- tegra_dc_writel(dc, format, DC_WIN_COLOR_DEPTH);
- tegra_dc_writel(dc, swap, DC_WIN_BYTE_SWAP);
-
- if (dc->soc->supports_block_linear) {
- unsigned long height = tiling.value;
-
- switch (tiling.mode) {
- case TEGRA_BO_TILING_MODE_PITCH:
- value = DC_WINBUF_SURFACE_KIND_PITCH;
- break;
-
- case TEGRA_BO_TILING_MODE_TILED:
- value = DC_WINBUF_SURFACE_KIND_TILED;
- break;
-
- case TEGRA_BO_TILING_MODE_BLOCK:
- value = DC_WINBUF_SURFACE_KIND_BLOCK_HEIGHT(height) |
- DC_WINBUF_SURFACE_KIND_BLOCK;
- break;
- }
-
- tegra_dc_writel(dc, value, DC_WINBUF_SURFACE_KIND);
- } else {
- switch (tiling.mode) {
- case TEGRA_BO_TILING_MODE_PITCH:
- value = DC_WIN_BUFFER_ADDR_MODE_LINEAR_UV |
- DC_WIN_BUFFER_ADDR_MODE_LINEAR;
- break;
-
- case TEGRA_BO_TILING_MODE_TILED:
- value = DC_WIN_BUFFER_ADDR_MODE_TILE_UV |
- DC_WIN_BUFFER_ADDR_MODE_TILE;
- break;
-
- case TEGRA_BO_TILING_MODE_BLOCK:
- DRM_ERROR("hardware doesn't support block linear
mode\n");
- spin_unlock_irqrestore(&dc->lock, flags);
- return -EINVAL;
- }
-
- tegra_dc_writel(dc, value, DC_WIN_BUFFER_ADDR_MODE);
- }
-
- /* make sure bottom-up buffers are properly displayed */
- if (tegra_fb_is_bottom_up(fb)) {
- value = tegra_dc_readl(dc, DC_WIN_WIN_OPTIONS);
- value |= V_DIRECTION;
- tegra_dc_writel(dc, value, DC_WIN_WIN_OPTIONS);
-
- v_offset += fb->height - 1;
- } else {
- value = tegra_dc_readl(dc, DC_WIN_WIN_OPTIONS);
- value &= ~V_DIRECTION;
- tegra_dc_writel(dc, value, DC_WIN_WIN_OPTIONS);
- }
-
- tegra_dc_writel(dc, h_offset, DC_WINBUF_ADDR_H_OFFSET);
- tegra_dc_writel(dc, v_offset, DC_WINBUF_ADDR_V_OFFSET);
-
- value = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
- tegra_dc_writel(dc, value << 8, DC_CMD_STATE_CONTROL);
- tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
-
- spin_unlock_irqrestore(&dc->lock, flags);
-
- return 0;
-}
-
void tegra_dc_enable_vblank(struct tegra_dc *dc)
{
unsigned long value, flags;
@@ -998,30 +905,6 @@ void tegra_dc_cancel_page_flip(struct drm_crtc *crtc,
struct drm_file *file)
spin_unlock_irqrestore(&drm->event_lock, flags);
}
-static int tegra_dc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer
*fb,
- struct drm_pending_vblank_event *event, uint32_t
page_flip_flags)
-{
- unsigned int pipe = drm_crtc_index(crtc);
- struct tegra_dc *dc = to_tegra_dc(crtc);
-
- if (dc->event)
- return -EBUSY;
-
- if (event) {
- event->pipe = pipe;
- dc->event = event;
- drm_crtc_vblank_get(crtc);
- }
-
- if (crtc->primary->state)
- drm_atomic_set_fb_for_plane(crtc->primary->state, fb);
-
- tegra_dc_set_base(dc, 0, 0, fb);
- crtc->primary->fb = fb;
-
- return 0;
-}
-
static void tegra_dc_destroy(struct drm_crtc *crtc)
{
drm_crtc_cleanup(crtc);
@@ -1063,7 +946,7 @@ static void tegra_crtc_atomic_destroy_state(struct
drm_crtc *crtc,
}
static const struct drm_crtc_funcs tegra_crtc_funcs = {
- .page_flip = tegra_dc_page_flip,
+ .page_flip = drm_atomic_helper_page_flip,
.set_config = drm_atomic_helper_set_config,
.destroy = tegra_dc_destroy,
.reset = tegra_crtc_reset,
@@ -1338,6 +1221,16 @@ static int tegra_crtc_atomic_check(struct drm_crtc *crtc,
static void tegra_crtc_atomic_begin(struct drm_crtc *crtc)
{
+ struct tegra_dc *dc = to_tegra_dc(crtc);
+
+ if (crtc->state->event) {
+ crtc->state->event->pipe = drm_crtc_index(crtc);
+
+ WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+
+ dc->event = crtc->state->event;
+ crtc->state->event = NULL;
+ }
}
static void tegra_crtc_atomic_flush(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 0dd81d050ccb..5b81b44af9e4 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -10,6 +10,7 @@
#include <linux/host1x.h>
#include <linux/iommu.h>
+#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include "drm.h"
@@ -26,13 +27,90 @@ struct tegra_drm_file {
struct list_head contexts;
};
+static void tegra_atomic_schedule(struct tegra_drm *tegra,
+ struct drm_atomic_state *state)
+{
+ tegra->commit.state = state;
+ schedule_work(&tegra->commit.work);
+}
+
+static void tegra_atomic_complete(struct tegra_drm *tegra,
+ struct drm_atomic_state *state)
+{
+ struct drm_device *drm = tegra->drm;
+
+ /*
+ * Everything below can be run asynchronously without the need to grab
+ * any modeset locks at all under one condition: It must be guaranteed
+ * that the asynchronous work has either been cancelled (if the driver
+ * supports it, which at least requires that the framebuffers get
+ * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
+ * before the new state gets committed on the software side with
+ * drm_atomic_helper_swap_state().
+ *
+ * This scheme allows new atomic state updates to be prepared and
+ * checked in parallel to the asynchronous completion of the previous
+ * update. Which is important since compositors need to figure out the
+ * composition of the next frame right after having submitted the
+ * current layout.
+ */
+
+ drm_atomic_helper_commit_pre_planes(drm, state);
+ drm_atomic_helper_commit_planes(drm, state);
+ drm_atomic_helper_commit_post_planes(drm, state);
+
+ drm_atomic_helper_wait_for_vblanks(drm, state);
+
+ drm_atomic_helper_cleanup_planes(drm, state);
+ drm_atomic_state_free(state);
+}
+
+static void tegra_atomic_work(struct work_struct *work)
+{
+ struct tegra_drm *tegra = container_of(work, struct tegra_drm,
+ commit.work);
+
+ tegra_atomic_complete(tegra, tegra->commit.state);
+}
+
+static int tegra_atomic_commit(struct drm_device *drm,
+ struct drm_atomic_state *state, bool async)
+{
+ struct tegra_drm *tegra = drm->dev_private;
+ int err;
+
+ err = drm_atomic_helper_prepare_planes(drm, state);
+ if (err)
+ return err;
+
+ /* serialize outstanding asynchronous commits */
+ mutex_lock(&tegra->commit.lock);
+ flush_work(&tegra->commit.work);
+
+ /*
+ * This is the point of no return - everything below never fails except
+ * when the hw goes bonghits. Which means we can commit the new state on
+ * the software side now.
+ */
+
+ drm_atomic_helper_swap_state(drm, state);
+
+ if (async)
+ tegra_atomic_schedule(tegra, state);
+ else
+ tegra_atomic_complete(tegra, state);
+
+ mutex_unlock(&tegra->commit.lock);
+ return 0;
+}
+
static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
.fb_create = tegra_fb_create,
#ifdef CONFIG_DRM_TEGRA_FBDEV
.output_poll_changed = tegra_fb_output_poll_changed,
#endif
.atomic_check = drm_atomic_helper_check,
- .atomic_commit = drm_atomic_helper_commit,
+ .atomic_commit = tegra_atomic_commit,
};
static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
@@ -58,6 +136,10 @@ static int tegra_drm_load(struct drm_device *drm, unsigned
long flags)
mutex_init(&tegra->clients_lock);
INIT_LIST_HEAD(&tegra->clients);
+
+ mutex_init(&tegra->commit.lock);
+ INIT_WORK(&tegra->commit.work, tegra_atomic_work);
+
drm->dev_private = tegra;
tegra->drm = drm;
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index 3db719de312f..b1c7027b26e7 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -50,6 +50,12 @@ struct tegra_drm {
#endif
unsigned int pitch_align;
+
+ struct {
+ struct drm_atomic_state *state;
+ struct work_struct work;
+ struct mutex lock;
+ } commit;
};
struct tegra_drm_client;
--
2.1.3
