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drm/amd/display: Add HBlank reduction DPCD write to DPMS sequence

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[Why]
Certain small HBlank timings may not have a large enough HBlank to
support audio when low bpp DSC is enabled. HBlank expansion by the
source can solve this problem, but requires the branch/sink to support
HBlank reduction.

[How]
Update DPMS sequence to call DM to perform DPCD write to enable HBlank
reduction on the branch/sink. Add stub in dm_helpers to be implemented
later.

Reviewed-by: Michael Strauss <michael.strauss@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
George Shen
2024-12-09 11:23:42 -05:00
committed by Alex Deucher
parent 787e7be0c9
commit 1619d4168b
3 changed files with 28 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/dc/dm_helpers.h
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@@ -158,6 +158,11 @@ bool dm_helpers_dp_write_dsc_enable(
const struct dc_stream_state *stream,
bool enable
);
bool dm_helpers_dp_write_hblank_reduction(
struct dc_context *ctx,
const struct dc_stream_state *stream);
bool dm_helpers_is_dp_sink_present(
struct dc_link *link);