linux-kernel - [PATCH 4.19 231/421] drm/amd/display: fix use_max

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Date:   Mon, 19 Jul 2021 16:50:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Aric Cyr <Aric.Cyr@....com>, Stylon Wang <stylon.wang@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 231/421] drm/amd/display: fix use_max_lb flag for 420 pixel formats

From: Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>

[ Upstream commit 8809a7a4afe90ad9ffb42f72154d27e7c47551ae ]

Right now the flag simply selects memory config 0 when flag is true
however 420 modes benefit more from memory config 3.

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>
Reviewed-by: Aric Cyr <Aric.Cyr@....com>
Acked-by: Stylon Wang <stylon.wang@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c
index 321af9af95e8..8f5246308d26 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c
@@ -476,10 +476,13 @@ static enum lb_memory_config dpp1_dscl_find_lb_memory_config(struct dcn10_dpp *d
 	int vtaps_c = scl_data->taps.v_taps_c;
 	int ceil_vratio = dc_fixpt_ceil(scl_data->ratios.vert);
 	int ceil_vratio_c = dc_fixpt_ceil(scl_data->ratios.vert_c);
-	enum lb_memory_config mem_cfg = LB_MEMORY_CONFIG_0;
 
-	if (dpp->base.ctx->dc->debug.use_max_lb)
-		return mem_cfg;
+	if (dpp->base.ctx->dc->debug.use_max_lb) {
+		if (scl_data->format == PIXEL_FORMAT_420BPP8
+				|| scl_data->format == PIXEL_FORMAT_420BPP10)
+			return LB_MEMORY_CONFIG_3;
+		return LB_MEMORY_CONFIG_0;
+	}
 
 	dpp->base.caps->dscl_calc_lb_num_partitions(
 			scl_data, LB_MEMORY_CONFIG_1, &num_part_y, &num_part_c);
-- 
2.30.2