4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit d8d2f174bcc2c26c3485c70e0c6fe22b27bce739 ] [Why] The stream->mode_changed flag can persist in the following sequence of atomic commits: Commit 1: Enable CRTC0 (mode_changed = true), Enable CRTC1 (mode_changed = true) Commit 2: Disable CRTC1 (mode_changed = false) In this sequence we want to keep the exiting CRTC0 but it's not in the atomic state for the commit since it hasn't been modified. In this case the stream->mode_changed flag persists as true and we don't re-program the planes for the existing stream. [How] The flag needs to be cleared and it makes the most sense to do it within DC after the state has been committed. Nothing following dc_commit_state should think that the stream's mode has changed. Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx> Reviewed-by: Leo Li <sunpeng.li@xxxxxxx> Acked-by: Tony Cheng <Tony.Cheng@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/amd/display/dc/core/dc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index 9045e6fa0780..bb0cda727605 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -958,6 +958,9 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c /* pplib is notified if disp_num changed */ dc->hwss.set_bandwidth(dc, context, true); + for (i = 0; i < context->stream_count; i++) + context->streams[i]->mode_changed = false; + dc_release_state(dc->current_state); dc->current_state = context; -- 2.19.1
