The RCAR-DU utilises a running VSPD pipeline to perform processing for the display pipeline. This presents the opportunity for some race conditions to affect the quality of the display output. To prevent reporting page flips early, we must track this timing through the VSP1, and only allow the rcar-du object to report the page-flip completion event after the VSP1 has processed. This series ensures that tearing and flicker is prevented, without introducing any (substantial) performance impact. These patches have been tested by introducing artificial delays in the commit code paths and verifying that no visual tearing or flickering occurs. Extensive testing around the race window has been performed by dynamically adapting the artificial delay between 15, and 17 seconds in 100uS increments for periods of 5 seconds on each delay test. These tests have successfully run for 3 hours. Manual start/stop testing has also been performed. Mauro: As this patchset covers two subsystems, and the DRM/DU side is dependant upon the media/VSP side, If you are happy with these patches, Would it be possible to get acks from you for integration through the DRM tree please? Regards Kieran Kieran Bingham (3): v4l: vsp1: Postpone frame end handling in event of display list race v4l: vsp1: Extend VSP1 module API to allow DRM callbacks drm: rcar-du: Register a completion callback with VSP1 Laurent Pinchart (1): drm: rcar-du: Arm the page flip event after queuing the page flip drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 30 ++++++++++++++------------ drivers/gpu/drm/rcar-du/rcar_du_crtc.h | 1 +- drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 9 ++++++++- drivers/media/platform/vsp1/vsp1_dl.c | 19 ++++++++++++++-- drivers/media/platform/vsp1/vsp1_dl.h | 2 +- drivers/media/platform/vsp1/vsp1_drm.c | 17 +++++++++++++++- drivers/media/platform/vsp1/vsp1_drm.h | 11 ++++++++++- drivers/media/platform/vsp1/vsp1_pipe.c | 13 ++++++++++- include/media/vsp1.h | 7 ++++++- 9 files changed, 92 insertions(+), 17 deletions(-) base-commit: 4df0f635a142c7498d20de9356851fb989c7f653 -- git-series 0.9.1
