[v2] drm/i915/display: Skip multiple FBC updates within same frame
Uma Shankar
uma.shankar at intel.com
Thu Sep 10 09:03:14 UTC 2020
Skip Multiple fbc activation and de-activation within the same frame.
v2: Add a wait for vblank instead of skipping totally
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 29 ++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index b8eef61ac078..2f35dc6c402b 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1055,6 +1055,8 @@ static void __intel_fbc_post_update(struct intel_crtc *crtc)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_fbc *fbc = &dev_priv->fbc;
+ static u32 old_frame_cnt = 0;
+ static u32 new_frame_cnt = 0;
drm_WARN_ON(&dev_priv->drm, !mutex_is_locked(&fbc->lock));
@@ -1075,10 +1077,29 @@ static void __intel_fbc_post_update(struct intel_crtc *crtc)
if (!intel_fbc_can_activate(crtc))
return;
- if (!fbc->busy_bits)
- intel_fbc_hw_activate(dev_priv);
- else
- intel_fbc_deactivate(dev_priv, "frontbuffer write");
+ old_frame_cnt = new_frame_cnt;
+ new_frame_cnt = intel_crtc_get_vblank_counter(crtc);
+ if (!fbc->busy_bits) {
+ if (old_frame_cnt != new_frame_cnt) {
+ intel_fbc_hw_activate(dev_priv);
+ drm_dbg_kms(&dev_priv->drm, "Activating FBC on pipe %c\n",
+ pipe_name(crtc->pipe));
+ } else {
+ drm_dbg_kms(&dev_priv->drm, "Wait for vblank before Activating FBC on pipe %c\n",
+ pipe_name(crtc->pipe));
+ intel_wait_for_vblank_if_active(dev_priv, crtc->pipe);
+ intel_fbc_hw_activate(dev_priv);
+ }
+ } else {
+ if (old_frame_cnt != new_frame_cnt) {
+ intel_fbc_deactivate(dev_priv, "frontbuffer write");
+ drm_dbg_kms(&dev_priv->drm, "De-Activating FBC on pipe %c\n",
+ pipe_name(crtc->pipe));
+ } else {
+ drm_dbg_kms(&dev_priv->drm, "Skipped De-Activating FBC on pipe %c\n",
+ pipe_name(crtc->pipe));
+ }
+ }
}
void intel_fbc_post_update(struct intel_atomic_state *state,
--
2.26.2
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