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| author | Anthony Koo <Anthony.Koo@amd.com> | 2018-03-15 14:54:30 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2018-04-11 13:07:46 -0500 |
| commit | 87943159f4093d2dae22abccbe046dac0fbdad4f (patch) | |
| tree | a73f11eec6c1ed947ff1b5649ec1e36c38eb63c4 /drivers/gpu/drm/amd/display/dc/core/dc_link.c | |
| parent | 5813dd1c0c4e06b3321142cd2da99909a1f41707 (diff) | |
| download | linux-87943159f4093d2dae22abccbe046dac0fbdad4f.tar.bz2 | |
drm/amd/display: Only program MSA_TIMING_PARAM if it changed
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 82ee9de23115..c18f24afa698 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -1183,16 +1183,21 @@ static void enable_stream_features(struct pipe_ctx *pipe_ctx) { struct dc_stream_state *stream = pipe_ctx->stream; struct dc_link *link = stream->sink->link; - union down_spread_ctrl downspread; + union down_spread_ctrl old_downspread; + union down_spread_ctrl new_downspread; core_link_read_dpcd(link, DP_DOWNSPREAD_CTRL, - &downspread.raw, sizeof(downspread)); + &old_downspread.raw, sizeof(old_downspread)); - downspread.bits.IGNORE_MSA_TIMING_PARAM = + new_downspread.raw = old_downspread.raw; + + new_downspread.bits.IGNORE_MSA_TIMING_PARAM = (stream->ignore_msa_timing_param) ? 1 : 0; - core_link_write_dpcd(link, DP_DOWNSPREAD_CTRL, - &downspread.raw, sizeof(downspread)); + if (new_downspread.raw != old_downspread.raw) { + core_link_write_dpcd(link, DP_DOWNSPREAD_CTRL, + &new_downspread.raw, sizeof(new_downspread)); + } } static enum dc_status enable_link_dp( |