[PATCH 23/54] drm/amd/display: dcc always on for bw calculations on raven

[Harry Wentland]

From: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu at amd.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
---
 .../gpu/drm/amd/display/dc/calcs/dcn_calcs.c  | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
index e44b8d3d6891..080f777d705e 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
@@ -250,7 +250,24 @@ static void pipe_ctx_to_e2e_pipe_params (
 	else if (pipe->bottom_pipe != NULL && pipe->bottom_pipe->plane_state == pipe->plane_state)
 		input->src.is_hsplit = true;
 
-	input->src.dcc                 = pipe->plane_state->dcc.enable;
+	if (pipe->plane_res.dpp->ctx->dc->debug.optimized_watermark) {
+		/*
+		 * this method requires us to always re-calculate watermark when dcc change
+		 * between flip.
+		 */
+		input->src.dcc = pipe->plane_state->dcc.enable ? 1 : 0;
+	} else {
+		/*
+		 * allow us to disable dcc on the fly without re-calculating WM
+		 *
+		 * extra overhead for DCC is quite small.  for 1080p WM without
+		 * DCC is only 0.417us lower (urgent goes from 6.979us to 6.562us)
+		 */
+		unsigned int bpe;
+
+		input->src.dcc = pipe->plane_res.dpp->ctx->dc->res_pool->hubbub->funcs->
+			dcc_support_pixel_format(pipe->plane_state->format, &bpe) ? 1 : 0;
+	}
 	input->src.dcc_rate            = 1;
 	input->src.meta_pitch          = pipe->plane_state->dcc.grph.meta_pitch;
 	input->src.source_scan         = dm_horz;
-- 
2.17.1