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drm/amd/display: Re-check seamless boot can be enabled or not

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[Why]
If the seamless boot feature has already been enabled, and
dc_commit_streams is called again before receiving a flip, the
driver will adjust the engine clock without turning off the screen,
which will cause garbage to occur. However, in reality, the Pixel
Clock from the first dc_commit_streams and the second dc_commit_streams
are different.

[How]
If the apply seamless boot flag in the previous stream has not been
cleared, and dc_commit_streams is received again, we need to recheck
whether seamless boot should be disabled

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Paul Hsieh <Paul.Hsieh@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Paul Hsieh 2025-10-30 12:17:53 +08:00 committed by Alex Deucher
parent c798836bb7
commit d24203bb62
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -2147,6 +2147,14 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
if (!dcb->funcs->is_accelerated_mode(dcb)) {
disable_vbios_mode_if_required(dc, context);
dc->hwss.enable_accelerated_mode(dc, context);
} else if (get_seamless_boot_stream_count(dc->current_state) > 0) {
/* If the previous Stream still retains the apply seamless boot flag,
* it means the OS has not actually performed a flip yet.
* At this point, if we receive dc_commit_streams again, we should
* once more check whether the actual HW timing matches what the OS
* has provided
*/
disable_vbios_mode_if_required(dc, context);
}
if (dc->hwseq->funcs.wait_for_pipe_update_if_needed) {