The generic atomic helper likes to skip a prepare_plane_fb() if it
decides that the plane->fb is unchanged. This is wrong for us for a
couple of reasons:
- if the pipe is reconfigured (i.e. a size change) but the framebuffer
is untouched, we still have to flush any rendering prior to the
reconfiguration to prevent wait-for-scanline GPU hangs
- if the framebuffer is rotated, it remains the same but has a
different view and a different address.
Finally, even if the framebuffer is unchanged the flip/modeset should be
ordered with respect to rendering to the frontbuffer.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_atomic_plane.c | 2 --
drivers/gpu/drm/i915/intel_display.c | 60 ++++++++++++++++++++++++-------
drivers/gpu/drm/i915/intel_drv.h | 4 ---
3 files changed, 47 insertions(+), 19 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index b41bf380f2ab..76a5bbbaaa98 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -190,8 +190,6 @@ static void intel_plane_atomic_update(struct drm_plane *plane,
}
const struct drm_plane_helper_funcs intel_plane_helper_funcs = {
- .prepare_fb = intel_prepare_plane_fb,
- .cleanup_fb = intel_cleanup_plane_fb,
.atomic_check = intel_plane_atomic_check,
.atomic_update = intel_plane_atomic_update,
};
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c4096204e5a3..9c769b5c91b8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13938,7 +13938,7 @@ static int intel_atomic_check(struct drm_device *dev,
*
* Returns 0 on success, negative error code on failure.
*/
-int
+static int
intel_prepare_plane_fb(struct drm_plane *plane,
struct drm_plane_state *new_state)
{
@@ -14024,7 +14024,7 @@ intel_prepare_plane_fb(struct drm_plane *plane,
*
* Must be called with struct_mutex held.
*/
-void
+static void
intel_cleanup_plane_fb(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
@@ -14043,6 +14043,49 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
intel_unpin_fb_obj(old_state->fb, old_state->rotation);
}
+static int intel_atomic_commit_prepare_planes(struct drm_atomic_state *state)
+{
+ struct drm_plane *plane;
+ struct drm_plane_state *plane_state;
+ int i, j, ret;
+
+ ret = mutex_lock_interruptible(&state->dev->struct_mutex);
+ if (ret)
+ return ret;
+
+ for_each_plane_in_state(state, plane, plane_state, i) {
+ ret = intel_prepare_plane_fb(plane, plane_state);
+ if (ret)
+ break;
+ }
+
+ if (ret) {
+ for_each_plane_in_state(state, plane, plane_state, j) {
+ if (j >= i)
+ break;
+
+ intel_cleanup_plane_fb(plane, plane_state);
+ }
+ }
+
+ mutex_unlock(&state->dev->struct_mutex);
+
+ return ret;
+}
+
+static void intel_atomic_commit_cleanup_planes(struct drm_atomic_state *state)
+{
+ struct drm_plane *plane;
+ struct drm_plane_state *plane_state;
+ int i;
+
+ mutex_lock(&state->dev->struct_mutex);
+
+ for_each_plane_in_state(state, plane, plane_state, i)
+ intel_cleanup_plane_fb(plane, plane_state);
+
+ mutex_unlock(&state->dev->struct_mutex);
+}
static int intel_atomic_prepare_commit(struct drm_device *dev,
struct drm_atomic_state *state,
@@ -14065,14 +14108,7 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
flush_workqueue(dev_priv->wq);
}
- ret = mutex_lock_interruptible(&dev->struct_mutex);
- if (ret)
- return ret;
-
- ret = drm_atomic_helper_prepare_planes(dev, state);
- mutex_unlock(&dev->struct_mutex);
-
- return ret;
+ return intel_atomic_commit_prepare_planes(state);
}
u32 intel_crtc_get_vblank_counter(struct intel_crtc *crtc)
@@ -14301,9 +14337,7 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
if (intel_state->modeset)
intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET);
- mutex_lock(&dev->struct_mutex);
- drm_atomic_helper_cleanup_planes(dev, state);
- mutex_unlock(&dev->struct_mutex);
+ intel_atomic_commit_cleanup_planes(state);
drm_atomic_helper_commit_cleanup_done(state);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index acb42d66fb08..3416796e5343 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1249,10 +1249,6 @@ __intel_framebuffer_create(struct drm_device *dev,
void intel_finish_page_flip_cs(struct drm_i915_private *dev_priv, int pipe);
void intel_finish_page_flip_mmio(struct drm_i915_private *dev_priv, int pipe);
void intel_check_page_flip(struct drm_i915_private *dev_priv, int pipe);
-int intel_prepare_plane_fb(struct drm_plane *plane,
- struct drm_plane_state *new_state);
-void intel_cleanup_plane_fb(struct drm_plane *plane,
- struct drm_plane_state *old_state);
int intel_plane_atomic_get_property(struct drm_plane *plane,
const struct drm_plane_state *state,
struct drm_property *property,
--
2.9.3
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