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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>
This commit is contained in:
Yongqiang Sun 2017-01-27 10:29:01 -05:00 committed by Alex Deucher
parent 75a7475576
commit bb9042da8e
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -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) {