From: Anthony Koo <Anthony.Koo@xxxxxxx>
Signed-off-by: Harry Wentland <harry.wentland at amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland at amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 15 ++++++++++-----
1 file 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(
--
2.14.1
