diff options
| author | George Shen <george.shen@amd.com> | 2024-12-09 11:23:42 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2025-01-06 14:44:27 -0500 |
| commit | 1619d4168b9797b80a2bc323f886f4181848acb3 (patch) | |
| tree | 7dd059e9ba9e26a0c5750908b628ed63a1ddd55a | |
| parent | 787e7be0c9fb1202124dd3f2dea0d39738f91bee (diff) | |
drm/amd/display: Add HBlank reduction DPCD write to DPMS sequence
[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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 6 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dm_helpers.h | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/link_dpms.c | 17 |
3 files changed, 28 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c index 6cbbb71d752b..fbd80d8545a8 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c @@ -885,6 +885,12 @@ bool dm_helpers_dp_write_dsc_enable( return ret; } +bool dm_helpers_dp_write_hblank_reduction(struct dc_context *ctx, const struct dc_stream_state *stream) +{ + // TODO + return false; +} + bool dm_helpers_is_dp_sink_present(struct dc_link *link) { bool dp_sink_present; diff --git a/drivers/gpu/drm/amd/display/dc/dm_helpers.h b/drivers/gpu/drm/amd/display/dc/dm_helpers.h index 2e4a46f1b499..5efddd48d5c5 100644 --- a/drivers/gpu/drm/amd/display/dc/dm_helpers.h +++ b/drivers/gpu/drm/amd/display/dc/dm_helpers.h @@ -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); diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c index 6f3e7e182145..ae79dc213901 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c @@ -772,6 +772,20 @@ static bool dp_set_dsc_on_rx(struct pipe_ctx *pipe_ctx, bool enable) return result; } +static bool dp_set_hblank_reduction_on_rx(struct pipe_ctx *pipe_ctx) +{ + struct dc *dc = pipe_ctx->stream->ctx->dc; + struct dc_stream_state *stream = pipe_ctx->stream; + bool result = false; + + if (dc_is_virtual_signal(stream->signal)) + result = true; + else + result = dm_helpers_dp_write_hblank_reduction(dc->ctx, stream); + return result; +} + + /* The stream with these settings can be sent (unblanked) only after DSC was enabled on RX first, * i.e. after dp_enable_dsc_on_rx() had been called */ @@ -2599,6 +2613,9 @@ void link_set_dpms_on( } } + if (dc_is_dp_signal(pipe_ctx->stream->signal)) + dp_set_hblank_reduction_on_rx(pipe_ctx); + if (pipe_ctx->stream->link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) allocate_usb4_bandwidth(pipe_ctx->stream); |