[PATCH 13/20] drm/amd/display: Do not update DRR while BW optimizations pending

[Qingqing Zhuo]

From: Aric Cyr <aric.cyr at amd.com>

[why]
While bandwidth optimizations are pending, it's possible a pstate change
will occur.  During this time, VSYNC handler should not also try to update
DRR parameters causing pstate hang

[how]
Do not adjust DRR if optimize bandwidth is set.

Reviewed-by: Aric Cyr <aric.cyr at amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo at amd.com>
Signed-off-by: Aric Cyr <aric.cyr at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 48 ++++++++++++++----------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 1c218c526650..cfb6f4eefce9 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -399,6 +399,13 @@ bool dc_stream_adjust_vmin_vmax(struct dc *dc,
 {
 	int i;
 
+	/*
+	 * Don't adjust DRR while there's bandwidth optimizations pending to
+	 * avoid conflicting with firmware updates.
+	 */
+	if (dc->optimized_required || dc->wm_optimized_required)
+		return false;
+
 	stream->adjust.v_total_max = adjust->v_total_max;
 	stream->adjust.v_total_mid = adjust->v_total_mid;
 	stream->adjust.v_total_mid_frame_num = adjust->v_total_mid_frame_num;
@@ -2134,27 +2141,33 @@ void dc_post_update_surfaces_to_stream(struct dc *dc)
 
 	post_surface_trace(dc);
 
-	if (dc->ctx->dce_version >= DCE_VERSION_MAX)
-		TRACE_DCN_CLOCK_STATE(&context->bw_ctx.bw.dcn.clk);
-	else
+	/*
+	 * Only relevant for DCN behavior where we can guarantee the optimization
+	 * is safe to apply - retain the legacy behavior for DCE.
+	 */
+
+	if (dc->ctx->dce_version < DCE_VERSION_MAX)
 		TRACE_DCE_CLOCK_STATE(&context->bw_ctx.bw.dce);
+	else {
+		TRACE_DCN_CLOCK_STATE(&context->bw_ctx.bw.dcn.clk);
 
-	if (is_flip_pending_in_pipes(dc, context))
-		return;
+		if (is_flip_pending_in_pipes(dc, context))
+			return;
 
-	for (i = 0; i < dc->res_pool->pipe_count; i++)
-		if (context->res_ctx.pipe_ctx[i].stream == NULL ||
-		    context->res_ctx.pipe_ctx[i].plane_state == NULL) {
-			context->res_ctx.pipe_ctx[i].pipe_idx = i;
-			dc->hwss.disable_plane(dc, &context->res_ctx.pipe_ctx[i]);
-		}
+		for (i = 0; i < dc->res_pool->pipe_count; i++)
+			if (context->res_ctx.pipe_ctx[i].stream == NULL ||
+					context->res_ctx.pipe_ctx[i].plane_state == NULL) {
+				context->res_ctx.pipe_ctx[i].pipe_idx = i;
+				dc->hwss.disable_plane(dc, &context->res_ctx.pipe_ctx[i]);
+			}
 
-	process_deferred_updates(dc);
+		process_deferred_updates(dc);
 
-	dc->hwss.optimize_bandwidth(dc, context);
+		dc->hwss.optimize_bandwidth(dc, context);
 
-	if (dc->debug.enable_double_buffered_dsc_pg_support)
-		dc->hwss.update_dsc_pg(dc, context, true);
+		if (dc->debug.enable_double_buffered_dsc_pg_support)
+			dc->hwss.update_dsc_pg(dc, context, true);
+	}
 
 	dc->optimized_required = false;
 	dc->wm_optimized_required = false;
@@ -4123,12 +4136,9 @@ void dc_commit_updates_for_stream(struct dc *dc,
 			if (new_pipe->plane_state && new_pipe->plane_state != old_pipe->plane_state)
 				new_pipe->plane_state->force_full_update = true;
 		}
-	} else if (update_type == UPDATE_TYPE_FAST && dc_ctx->dce_version >= DCE_VERSION_MAX) {
+	} else if (update_type == UPDATE_TYPE_FAST) {
 		/*
 		 * Previous frame finished and HW is ready for optimization.
-		 *
-		 * Only relevant for DCN behavior where we can guarantee the optimization
-		 * is safe to apply - retain the legacy behavior for DCE.
 		 */
 		dc_post_update_surfaces_to_stream(dc);
 	}
-- 
2.34.1