drm/amd/display: Fix for the no Audio bug with Tiled Displays

[WHY]
It seems like after a series of plug/unplugs we end up in a situation
where tiled display doesnt support Audio.

[HOW]
The issue seems to be related to when we check streams changed after an
HPD, we should be checking the audio_struct as well to see if any of its
values changed.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Mustapha Ghaddar <mustapha.ghaddar@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index c32fdcc..dcbfae2 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -1664,6 +1664,10 @@ bool dc_is_stream_unchanged(
        if (old_stream->ignore_msa_timing_param != stream->ignore_msa_timing_param)
                return false;
 
+       // Only Have Audio left to check whether it is same or not. This is a corner case for Tiled sinks
+       if (old_stream->audio_info.mode_count != stream->audio_info.mode_count)
+               return false;
+
        return true;
 }