drm/amd/display: fix seq issue: turn on clock before programming afmt.

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c b/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c
index 83bae20..327a0a7 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c
@@ -87,8 +87,10 @@ static void dce110_update_generic_info_packet(
         */
        uint32_t max_retries = 50;
 
+       REG_GET(AFMT_CNTL, AFMT_AUDIO_CLOCK_EN, &regval);
        /*we need turn on clock before programming AFMT block*/
-       REG_UPDATE(AFMT_CNTL, AFMT_AUDIO_CLOCK_EN, 1);
+       if (regval != 1)
+               REG_UPDATE(AFMT_CNTL, AFMT_AUDIO_CLOCK_EN, 1);
 
        if (REG(AFMT_VBI_PACKET_CONTROL1)) {
                if (packet_index >= 8)