drm/amd/display: Change power gating off sequence to fix hang

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.

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@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 75718151356de76d3a1ab173de978386d5787445..474c2d42525d78d432f6608b0b44b167c41a12c2 100644 (file)
--- 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) {