linux-kernel - [PATCH AUTOSEL 6.12 023/107] drm/amd/display: disable SG displays on cyan skillfish

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Message-ID: <20241124133301.3341829-23-sashal@kernel.org>
Date: Sun, 24 Nov 2024 08:28:43 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Alex Deucher <alexander.deucher@....com>,
	Harry Wentland <harry.wentland@....com>,
	Sasha Levin <sashal@...nel.org>,
	sunpeng.li@....com,
	Rodrigo.Siqueira@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	simona@...ll.ch,
	hamza.mahfooz@....com,
	alex.hung@....com,
	chiahsuan.chung@....com,
	sunil.khatri@....com,
	aurabindo.pillai@....com,
	mwen@...lia.com,
	Wayne.Lin@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.12 023/107] drm/amd/display: disable SG displays on cyan skillfish

From: Alex Deucher <alexander.deucher@....com>

[ Upstream commit 66369db7fdd7d58d78673bf83d2b87ea623efb63 ]

These parts were mainly for compute workloads, but they have
a display that was available for the console.  These chips
should support SG display, but I don't know that the support
was ever validated on Linux so disable it by default. It can
still be enabled by setting sg_display=1 for those that
want to play with it.  These systems also generally had large
carve outs so SG display was less of a factor.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3356
Reviewed-by: Harry Wentland <harry.wentland@....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 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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 8d97f17ffe662..623e349b6f137 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1886,7 +1886,11 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 		else
 			init_data.flags.gpu_vm_support = (amdgpu_sg_display != 0);
 	} else {
-		init_data.flags.gpu_vm_support = (amdgpu_sg_display != 0) && (adev->flags & AMD_IS_APU);
+		if (amdgpu_ip_version(adev, DCE_HWIP, 0) == IP_VERSION(2, 0, 3))
+			init_data.flags.gpu_vm_support = (amdgpu_sg_display == 1);
+		else
+			init_data.flags.gpu_vm_support =
+				(amdgpu_sg_display != 0) && (adev->flags & AMD_IS_APU);
 	}
 
 	adev->mode_info.gpu_vm_support = init_data.flags.gpu_vm_support;
-- 
2.43.0