[PATCH 57/73] drm/amd/display: Change frontend/backend programming sequence

[Harry Wentland]

From: "Leo (Sunpeng) Li" <sunpeng.li at amd.com>

This is a follow-up to the following change:

Yongqiang Sun: Program front end first when set mode.

Due to pipe-splitting features, how we handle stream enabling and
disabling needs to change.

In the case of pipe split disable, two planes need to be combined back
into the same stream. This needs to be done before any stream
programming happens.

The previous patch addresses this, but breaks cross-platform
compatibility. It's not guaranteed that a dc commit will be called
separately to program planes and streams.

Therefore, we handle the combined commit case by doing plane programming
both before and after stream programming, to handle pipe split disable
and plane enable respectively.

Change-Id: Ia8120f1f9d9e322556577b3054e3b19a1d860de3
Signed-off-by: Leo (Sunpeng) Li <sunpeng.li 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 | 41 ++++++++++++++++++++++----------
 1 file changed, 28 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index d70dbc102123..c1ae293b41b3 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -874,6 +874,33 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
 	if (!dcb->funcs->is_accelerated_mode(dcb))
 		dc->hwss.enable_accelerated_mode(dc);
 
+	/* Combine planes if required, in case of pipe split disable */
+	for (i = 0; i < dc->current_state->stream_count; i++) {
+		dc->hwss.apply_ctx_for_surface(
+			dc, dc->current_state->streams[i],
+			dc->current_state->stream_status[i].plane_count,
+			dc->current_state);
+	}
+
+	/* Program hardware */
+	dc->hwss.ready_shared_resources(dc, context);
+
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		pipe = &context->res_ctx.pipe_ctx[i];
+		dc->hwss.wait_for_mpcc_disconnect(dc, dc->res_pool, pipe);
+	}
+
+	result = dc->hwss.apply_ctx_to_hw(dc, context);
+
+	if (result != DC_OK)
+		goto fail;
+
+	if (context->stream_count > 1) {
+		enable_timing_multisync(dc, context);
+		program_timing_sync(dc, context);
+	}
+
+	/* Program all planes within new context*/
 	for (i = 0; i < context->stream_count; i++) {
 		const struct dc_sink *sink = context->streams[i]->sink;
 
@@ -905,19 +932,7 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
 				context->streams[i]->timing.pix_clk_khz);
 	}
 
-	dc->hwss.ready_shared_resources(dc, context);
-
-	for (i = 0; i < dc->res_pool->pipe_count; i++) {
-		pipe = &context->res_ctx.pipe_ctx[i];
-		dc->hwss.wait_for_mpcc_disconnect(dc, dc->res_pool, pipe);
-	}
-	result = dc->hwss.apply_ctx_to_hw(dc, context);
-
-	if (context->stream_count > 1) {
-		enable_timing_multisync(dc, context);
-		program_timing_sync(dc, context);
-	}
-
+fail:
 	dc_enable_stereo(dc, context, dc_streams, context->stream_count);
 
 	dc_release_state(dc->current_state);
-- 
2.14.1