[PATCH 13/16] drm/amd/display: enable plane if container of plane_status changed

[Qingqing Zhuo]

From: Hugo Hu <hugo.hu at amd.com>

[why]
We hit an issue which driver reallocate a pipe from desktop bottom
pipe to video bottom pipe. In this case, driver need to re-enable
plane.

[how]
Enable plane if container of plane status changed.

Signed-off-by: Hugo Hu <hugo.hu at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index 223e314d26b4..13183bd7ea0f 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -1160,13 +1160,20 @@ void dcn20_pipe_control_lock(
 
 static void dcn20_detect_pipe_changes(struct pipe_ctx *old_pipe, struct pipe_ctx *new_pipe)
 {
+	bool plane_state_update = false;
 	new_pipe->update_flags.raw = 0;
 
 	/* Exit on unchanged, unused pipe */
 	if (!old_pipe->plane_state && !new_pipe->plane_state)
 		return;
+
+	/* Detect plane state update */
+	if (old_pipe->plane_state && new_pipe->plane_state
+			&& (old_pipe->plane_state != new_pipe->plane_state)) {
+		plane_state_update = true;
+	}
 	/* Detect pipe enable/disable */
-	if (!old_pipe->plane_state && new_pipe->plane_state) {
+	if ((!old_pipe->plane_state && new_pipe->plane_state) || plane_state_update) {
 		new_pipe->update_flags.bits.enable = 1;
 		new_pipe->update_flags.bits.mpcc = 1;
 		new_pipe->update_flags.bits.dppclk = 1;
-- 
2.17.1