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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Sasha Levin" <sashal@kernel.org>,
	"Daniel Vetter" <daniel.vetter@ffwll.ch>,
	"Michel Dänzer" <michel.daenzer@amd.com>,
	amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"Daniel Vetter" <daniel.vetter@intel.com>
Subject: [PATCH AUTOSEL 4.4 093/100] radeon: insert 10ms sleep in dce5_crtc_load_lut
Date: Fri, 14 Feb 2020 11:24:17 -0500
Message-ID: <20200214162425.21071-93-sashal@kernel.org> (raw)
In-Reply-To: <20200214162425.21071-1-sashal@kernel.org>

From: Daniel Vetter <daniel.vetter@ffwll.ch>

[ Upstream commit ec3d65082d7dabad6fa8f66a8ef166f2d522d6b2 ]

Per at least one tester this is enough magic to recover the regression
introduced for some people (but not all) in

commit b8e2b0199cc377617dc238f5106352c06dcd3fa2
Author: Peter Rosin <peda@axentia.se>
Date:   Tue Jul 4 12:36:57 2017 +0200

    drm/fb-helper: factor out pseudo-palette

which for radeon had the side-effect of refactoring out a seemingly
redudant writing of the color palette.

10ms in a fairly slow modeset path feels like an acceptable form of
duct-tape, so maybe worth a shot and see what sticks.

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Michel Dänzer <michel.daenzer@amd.com>
References: https://bugzilla.kernel.org/show_bug.cgi?id=198123
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/radeon/radeon_display.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index b26e4eae7ac54..2e3bc48fb1eb7 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -110,6 +110,8 @@ static void dce5_crtc_load_lut(struct drm_crtc *crtc)
 
 	DRM_DEBUG_KMS("%d\n", radeon_crtc->crtc_id);
 
+	msleep(10);
+
 	WREG32(NI_INPUT_CSC_CONTROL + radeon_crtc->crtc_offset,
 	       (NI_INPUT_CSC_GRPH_MODE(NI_INPUT_CSC_BYPASS) |
 		NI_INPUT_CSC_OVL_MODE(NI_INPUT_CSC_BYPASS)));
-- 
2.20.1

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Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214162425.21071-1-sashal@kernel.org>
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 021/100] drm/amdgpu: remove 4 set but not used variable in amdgpu_atombios_get_connector_info_from_object_table Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 022/100] drm/amdgpu: remove set but not used variable 'dig_connector' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 023/100] drm/amdgpu: remove set but not used variable 'dig' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 024/100] drm/amdgpu: remove always false comparison in 'amdgpu_atombios_i2c_process_i2c_ch' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 025/100] drm/amdgpu: remove set but not used variable 'mc_shared_chmap' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 026/100] drm/amdgpu: remove set but not used variable 'amdgpu_connector' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 031/100] drm/radeon: remove set but not used variable 'size', 'relocs_chunk' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 032/100] drm/radeon: remove set but not used variable 'dig_connector' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 033/100] drm/radeon: remove set but not used variable 'radeon_connector' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 034/100] drm/radeon: remove set but not used variable 'blocks' Sasha Levin
2020-02-14 16:23 ` [PATCH AUTOSEL 4.4 035/100] drm/radeon: remove set but not used variable 'tv_pll_cntl1' Sasha Levin
2020-02-14 16:24 ` Sasha Levin [this message]

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