The patch below does not apply to the 5.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8db2d634ed29eeaed56fdbeaf63da7ae9e65280b Mon Sep 17 00:00:00 2001
From: Jaehyun Chung jaehyun.chung@amd.com Date: Thu, 30 Jul 2020 16:31:29 -0400 Subject: [PATCH] drm/amd/display: Blank stream before destroying HDCP session
[Why] Stream disable sequence incorretly destroys HDCP session while stream is not blanked and while audio is not muted. This sequence causes a flash of corruption during mode change and an audio click.
[How] Change sequence to blank stream before destroying HDCP session. Audio will also be muted by blanking the stream.
Cc: stable@vger.kernel.org Signed-off-by: Jaehyun Chung jaehyun.chung@amd.com Reviewed-by: Alvin Lee Alvin.Lee2@amd.com Acked-by: Qingqing Zhuo qingqing.zhuo@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com
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 4bd6e03a7ef3..117d8aaf2a9b 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -3286,12 +3286,11 @@ void core_link_disable_stream(struct pipe_ctx *pipe_ctx) core_link_set_avmute(pipe_ctx, true); }
+ dc->hwss.blank_stream(pipe_ctx); #if defined(CONFIG_DRM_AMD_DC_HDCP) update_psp_stream_config(pipe_ctx, true); #endif
- dc->hwss.blank_stream(pipe_ctx); - if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) deallocate_mst_payload(pipe_ctx);