[PATCH 04/13] drm/amd/display: Change power gating off sequence to fix hang

[Harry Wentland]

From: Yongqiang Sun <yongqiang.sun at amd.com>

Power off plane clear all the reg values includes cursor.
When OS call set cursor position, cursor address reg is cleared,
results in system hard hang.

Change-Id: Id4f2fce5fab34cc0091e0a4a51e1274e9205ea48
Signed-off-by: Yongqiang Sun <yongqiang.sun at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Harry Wentland <Harry.Wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 75718151356d..474c2d42525d 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1254,9 +1254,12 @@ bool dc_post_update_surfaces_to_stream(struct dc *dc)
 	post_surface_trace(dc);
 
 	for (i = 0; i < core_dc->current_context->res_ctx.pool->pipe_count; i++)
-		if (core_dc->current_context->res_ctx.pipe_ctx[i].stream == NULL)
+		if (core_dc->current_context->res_ctx.pipe_ctx[i].stream == NULL) {
+			core_dc->current_context->res_ctx.pipe_ctx[i].pipe_idx = i;
 			core_dc->hwss.power_down_front_end(
-				core_dc, &core_dc->current_context->res_ctx.pipe_ctx[i]);
+							core_dc, &core_dc->current_context->res_ctx.pipe_ctx[i]);
+		}
+
 
 	if (core_dc->res_pool->funcs->validate_bandwidth(core_dc, core_dc->current_context)
 			!= DC_OK) {
-- 
2.9.3