From: Quanyang Wang quanyang.wang@windriver.com
[ Upstream commit f1a75f4dd8edf272b6b7cdccf6ba6254ec9d15fa ]
When run xrandr to change resolution on Beaglebone Black board, it will print the error information:
root@beaglebone:~# xrandr -display :0 --output HDMI-1 --mode 720x400 [drm:drm_crtc_commit_wait] *ERROR* flip_done timed out [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:32:tilcdc crtc] commit wait timed out [drm:drm_crtc_commit_wait] *ERROR* flip_done timed out [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:34:HDMI-A-1] commit wait timed out [drm:drm_crtc_commit_wait] *ERROR* flip_done timed out [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:31:plane-0] commit wait timed out tilcdc 4830e000.lcdc: already pending page flip!
This is because there is operation sequence as below:
drm_atomic_connector_commit_dpms(mode is DRM_MODE_DPMS_OFF): ... drm_atomic_helper_setup_commit <- init_completion(commit_A->flip_done) drm_atomic_helper_commit_tail tilcdc_crtc_atomic_disable tilcdc_plane_atomic_update <- drm_crtc_send_vblank_event in tilcdc_crtc_irq is skipped since tilcdc_crtc->enabled is 0 tilcdc_crtc_atomic_flush <- drm_crtc_send_vblank_event is skipped since crtc->state->event is set to be NULL in tilcdc_plane_atomic_update drm_mode_setcrtc: ... drm_atomic_helper_setup_commit <- init_completion(commit_B->flip_done) drm_atomic_helper_wait_for_dependencies drm_crtc_commit_wait <- wait for commit_A->flip_done completing
Just as shown above, the steps which could complete commit_A->flip_done are all skipped and commit_A->flip_done will never be completed. This will result a time-out ERROR when drm_crtc_commit_wait check the commit_A->flip_done. So add drm_crtc_send_vblank_event in tilcdc_crtc_atomic_disable to complete commit_A->flip_done.
Fixes: cb345decb4d2 ("drm/tilcdc: Use standard drm_atomic_helper_commit") Signed-off-by: Quanyang Wang quanyang.wang@windriver.com Reviewed-by: Jyri Sarha jyri.sarha@iki.fi Tested-by: Jyri Sarha jyri.sarha@iki.fi Signed-off-by: Jyri Sarha jyri.sarha@iki.fi Link: https://patchwork.freedesktop.org/patch/msgid/20210209082415.382602-1-quanya... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c index 518220bd092a..0aaa4a26b5db 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c @@ -518,6 +518,15 @@ static void tilcdc_crtc_off(struct drm_crtc *crtc, bool shutdown)
drm_crtc_vblank_off(crtc);
+ spin_lock_irq(&crtc->dev->event_lock); + + if (crtc->state->event) { + drm_crtc_send_vblank_event(crtc, crtc->state->event); + crtc->state->event = NULL; + } + + spin_unlock_irq(&crtc->dev->event_lock); + tilcdc_crtc_disable_irqs(dev);
pm_runtime_put_sync(dev->dev);