linux-kernel - [PATCH AUTOSEL 6.4 08/58] Revert "drm/amd/display: disable SubVP + DRR to prevent underflow"

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Message-Id: <20230724011338.2298062-8-sashal@kernel.org>
Date:   Sun, 23 Jul 2023 21:12:36 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Aurabindo Pillai <aurabindo.pillai@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, harry.wentland@....com,
        sunpeng.li@....com, christian.koenig@....com, Xinhui.Pan@....com,
        airlied@...il.com, daniel@...ll.ch, qingqing.zhuo@....com,
        hamza.mahfooz@....com, hersenxs.wu@....com, hdegoede@...hat.com,
        stylon.wang@....com, srinivasan.shanmugam@....com,
        wayne.lin@....com, Alvin.Lee2@....com, Jun.Lei@....com,
        Nevenko.Stupar@....com, Dillon.Varone@....com, George.Shen@....com,
        rdunlap@...radead.org, austin.zheng@....com, shiwu.zhang@....com,
        lijo.lazar@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.4 08/58] Revert "drm/amd/display: disable SubVP + DRR to prevent underflow"

From: Aurabindo Pillai <aurabindo.pillai@....com>

[ Upstream commit f38129bb081758176dd78304faaee95007fb8838 ]

This reverts commit 80c6d6804f31451848a3956a70c2bcb1f07cfcb0.
The orignal commit was intended as a workaround to prevent underflow and
flickering when using one normal monitor and the other high refresh rate
monitor (> 120Hz).

This patch is being reverted in favour of a software solution to enable
SubVP+DRR

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@....com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c    | 5 -----
 drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c | 4 ----
 drivers/gpu/drm/amd/include/amd_shared.h             | 1 -
 3 files changed, 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 7acd73e5004fb..80756c7b92a54 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1646,11 +1646,6 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 	if (amdgpu_dc_feature_mask & DC_DISABLE_LTTPR_DP2_0)
 		init_data.flags.allow_lttpr_non_transparent_mode.bits.DP2_0 = true;
 
-	/* Disable SubVP + DRR config by default */
-	init_data.flags.disable_subvp_drr = true;
-	if (amdgpu_dc_feature_mask & DC_ENABLE_SUBVP_DRR)
-		init_data.flags.disable_subvp_drr = false;
-
 	init_data.flags.seamless_boot_edp_requested = false;
 
 	if (check_seamless_boot_capability(adev)) {
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
index 0c4c3208def17..d7eca24bd09d2 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
@@ -880,10 +880,6 @@ static bool subvp_drr_schedulable(struct dc *dc, struct dc_state *context, struc
 	int16_t stretched_drr_us = 0;
 	int16_t drr_stretched_vblank_us = 0;
 	int16_t max_vblank_mallregion = 0;
-	const struct dc_config *config = &dc->config;
-
-	if (config->disable_subvp_drr)
-		return false;
 
 	// Find SubVP pipe
 	for (i = 0; i < dc->res_pool->pipe_count; i++) {
diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
index e4a22c68517d1..f175e65b853a0 100644
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -240,7 +240,6 @@ enum DC_FEATURE_MASK {
 	DC_DISABLE_LTTPR_DP2_0 = (1 << 6), //0x40, disabled by default
 	DC_PSR_ALLOW_SMU_OPT = (1 << 7), //0x80, disabled by default
 	DC_PSR_ALLOW_MULTI_DISP_OPT = (1 << 8), //0x100, disabled by default
-	DC_ENABLE_SUBVP_DRR = (1 << 9), // 0x200, disabled by default
 };
 
 enum DC_DEBUG_MASK {
-- 
2.39.2