This is a note to let you know that I've just added the patch titled drm/amd/display: Don't optimize bandwidth before disabling planes to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-amd-display-don-t-optimize-bandwidth-before-disa.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit bba4d29e2d49245fe6bdeb6048d9674fea431062 Author: Aric Cyr <aric.cyr@xxxxxxx> Date: Fri Feb 12 18:13:59 2021 -0500 drm/amd/display: Don't optimize bandwidth before disabling planes [ Upstream commit 6ad98e8aeb0106f453bb154933e8355849244990 ] [Why] There is a window of time where we optimize bandwidth due to no streams enabled will enable PSTATE changing but HUBPs are not disabled yet. This results in underflow counter increasing in some hotplug scenarios. [How] Set the optimize-bandwidth flag for later processing once all the HUBPs are properly disabled. Signed-off-by: Aric Cyr <aric.cyr@xxxxxxx> Acked-by: Bindu Ramamurthy <bindu.r@xxxxxxx> Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index ffb21196bf59..921c4ca6e902 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -2345,7 +2345,8 @@ static void commit_planes_do_stream_update(struct dc *dc, if (pipe_ctx->stream_res.audio && !dc->debug.az_endpoint_mute_only) pipe_ctx->stream_res.audio->funcs->az_disable(pipe_ctx->stream_res.audio); - dc->hwss.optimize_bandwidth(dc, dc->current_state); + dc->optimized_required = true; + } else { if (dc->optimize_seamless_boot_streams == 0) dc->hwss.prepare_bandwidth(dc, dc->current_state);