From: Chiawen Huang <chiawen.huang@amd.com>
Date: Fri, 25 Sep 2020 14:54:55 +0000 (-0400)
Subject: drm/amd/display: disable stream if pixel clock changed with link active
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8353d30e747f4e5cdd867c6b054dbb85cdcc76a9;p=linux.git

drm/amd/display: disable stream if pixel clock changed with link active

[Why]
Vbios uses preferred timing to turn on edp but OS could use other
timing.  If change pixel clock when link active, there is unexpected
garbage on monitor.

[How]
Once pixel clock changed, the driver needs to disable stream.

Signed-off-by: Chiawen Huang <chiawen.huang@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 76946a7d47ca3..2a725a5fba402 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -864,7 +864,6 @@ static void disable_vbios_mode_if_required(
 		if (stream->link->local_sink &&
 			stream->link->local_sink->sink_signal == SIGNAL_TYPE_EDP) {
 			link = stream->link;
-			break;
 		}
 
 		if (link != NULL) {