[PATCH v3 4/4] drm/i915/psr: Add poll for checking PSR is idle before starting update

[Jouni Högander]

We are currently observing crc failures after we started using dsb for PSR
updates as well. This seems to happen because PSR HW is still sending
couple of updates using old framebuffers on wake-up.

Fix this by adding poll ensuring PSR is idle before starting update.

v2: pass new_crtc_state->dsb_commit to intel_psr_wait_for_idle_dsb

Signed-off-by: Jouni Högander <jouni.hogan...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c 
b/drivers/gpu/drm/i915/display/intel_display.c
index c1a3a95c65f0..5dca7f96b425 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -7271,6 +7271,9 @@ static void intel_atomic_dsb_finish(struct 
intel_atomic_state *state,
                intel_psr_trigger_frame_change_event(new_crtc_state->dsb_commit,
                                                     state, crtc);
 
+               intel_psr_wait_for_idle_dsb(new_crtc_state->dsb_commit,
+                                           new_crtc_state);
+
                if (new_crtc_state->use_dsb)
                        intel_dsb_vblank_evade(state, 
new_crtc_state->dsb_commit);
 
-- 
2.43.0