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drm/amd/display: Only program MSA_TIMING_PARAM if it changed

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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>
This commit is contained in:
Anthony Koo
2018-03-15 14:54:30 -04:00
committed by Alex Deucher
parent 5813dd1c0c
commit 87943159f4
1 changed files with 10 additions and 5 deletions
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15
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@@ -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(