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| author | Bing Guo <bing.guo@amd.com> | 2021-04-05 16:51:24 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-04-20 21:42:53 -0400 |
| commit | 6016cd9dba0ff376e84b67823882850d051312e1 (patch) | |
| tree | 12f21418883a32fa98613faf5385547efc655e82 /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | |
| parent | fdf7d4f547f75c643a71ddc644080c69d743d8c3 (diff) | |
| download | linux-6016cd9dba0ff376e84b67823882850d051312e1.tar.gz linux-6016cd9dba0ff376e84b67823882850d051312e1.tar.bz2 linux-6016cd9dba0ff376e84b67823882850d051312e1.zip | |
drm/amd/display: add helper for enabling mst stream features
[Why]
Some MST devices uses different method to enable mst
specific stream features.
[How]
Add dm_helpers_mst_enable_stream features. This can be
modified later when we are ready to implement those features.
Signed-off-by: Bing Guo <bing.guo@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 25 |
1 files changed, 25 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 103e29905b57..e8b325a828c1 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 @@ -711,3 +711,28 @@ bool dm_helpers_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enab enable ? "en" : "dis", ret); return ret; } + +void dm_helpers_mst_enable_stream_features(const struct dc_stream_state *stream) +{ + /* TODO: virtual DPCD */ + struct dc_link *link = stream->link; + union down_spread_ctrl old_downspread; + union down_spread_ctrl new_downspread; + + if (link->aux_access_disabled) + return; + + if (!dm_helpers_dp_read_dpcd(link->ctx, link, DP_DOWNSPREAD_CTRL, + &old_downspread.raw, + sizeof(old_downspread))) + return; + + new_downspread.raw = old_downspread.raw; + new_downspread.bits.IGNORE_MSA_TIMING_PARAM = + (stream->ignore_msa_timing_param) ? 1 : 0; + + if (new_downspread.raw != old_downspread.raw) + dm_helpers_dp_write_dpcd(link->ctx, link, DP_DOWNSPREAD_CTRL, + &new_downspread.raw, + sizeof(new_downspread)); +} |