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drm/amd/display: Increase HDMI AV mute wait from 2 to 3 frames

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Some HDMI sinks need additional GCP packets to properly process the
mute state before the timing generator is disabled, especially after
link re-establishment with HDMI 2.0 scrambling enabled. Waiting for
only 2 frames is insufficient for certain monitor firmware, resulting
in garbled display output on resume from suspend.

Increase the AV mute wait in dcn30_set_avmute() from 2 to 3 frames
to ensure the sink receives enough GCP packets.

Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5167
Assisted-by: Cursor:Claude-Opus-4.6
Reviewed-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 0c0d5174b0)
Cc: stable@vger.kernel.org
This commit is contained in:
Ray Wu
2026-07-03 09:14:49 +08:00
committed by Alex Deucher
parent e3a721753f
commit c216b39fbb
1 changed files with 11 additions and 5 deletions
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16
drivers/gpu/drm/amd/display/dc/hwss/dcn30/dcn30_hwseq.c
View File

@@ -847,13 +847,19 @@ void dcn30_set_avmute(struct pipe_ctx *pipe_ctx, bool enable)
pipe_ctx->stream_res.stream_enc,
enable);
/* Wait for two frame to make sure AV mute is sent out */
/* Wait for three frames to make sure AV mute is sent out.
* Some HDMI sinks need additional GCP packets to properly
* process the mute state, especially after link re-establishment
* with HDMI 2.0 scrambling enabled.
*/
if (enable && pipe_ctx->stream_res.tg->funcs->is_tg_enabled(pipe_ctx->stream_res.tg)) {
int i;
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE);
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VBLANK);
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE);
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VBLANK);
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE);
for (i = 0; i < 3; i++) {
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VBLANK);
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE);
}
}
}
}