FAILED: patch "[PATCH] drm/amd/display: Blank stream before destroying HDCP session" failed to apply to 5.9-stable tree

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 <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8db2d634ed29eeaed56fdbeaf63da7ae9e65280b Mon Sep 17 00:00:00 2001
From: Jaehyun Chung <[email protected]>
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.

index 4bd6e03a7ef3..117d8aaf2a9b 100644
@@ -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);