linux-kernel - [PATCH 5.8 040/148] drm/amd/display: Blank stream before destroying HDCP session

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Message-Id: <20200824082415.969006363@linuxfoundation.org>
Date:   Mon, 24 Aug 2020 10:28:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jaehyun Chung <jaehyun.chung@....com>,
        Alvin Lee <Alvin.Lee2@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.8 040/148] drm/amd/display: Blank stream before destroying HDCP session

From: Jaehyun Chung <jaehyun.chung@....com>

commit 79940e4d10df9c737a394630968471c632246ee0 upstream.

[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@...r.kernel.org
Signed-off-by: Jaehyun Chung <jaehyun.chung@....com>
Reviewed-by: Alvin Lee <Alvin.Lee2@....com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -3265,12 +3265,11 @@ void core_link_disable_stream(struct pip
 		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);