From d8d2f174bcc2c26c3485c70e0c6fe22b27bce739 Mon Sep 17 00:00:00 2001
From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Date: Fri, 25 Jan 2019 15:23:09 -0500
Subject: [PATCH] drm/amd/display: Clear stream->mode_changed after commit
Git-commit: d8d2f174bcc2c26c3485c70e0c6fe22b27bce739
Patch-mainline: v5.1-rc1
References: bsc#1111666

[Why]
The stream->mode_changed flag can persist in the following sequence
of atomic commits:

Commit 1:
Enable CRTC0 (mode_changed = true), Enable CRTC1 (mode_changed = true)

Commit 2:
Disable CRTC1 (mode_changed = false)

In this sequence we want to keep the exiting CRTC0 but it's not in the
atomic state for the commit since it hasn't been modified. In this case
the stream->mode_changed flag persists as true and we don't re-program
the planes for the existing stream.

[How]
The flag needs to be cleared and it makes the most sense to do it within
DC after the state has been committed. Nothing following dc_commit_state
should think that the stream's mode has changed.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Acked-by: Tony Cheng <Tony.Cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

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

--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -958,6 +958,9 @@ static enum dc_status dc_commit_state_no
 	/* pplib is notified if disp_num changed */
 	dc->hwss.set_bandwidth(dc, context, true);
 
+	for (i = 0; i < context->stream_count; i++)
+		context->streams[i]->mode_changed = false;
+
 	dc_release_state(dc->current_state);
 
 	dc->current_state = context;