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drm/amd/display: disable SG displays on cyan skillfish

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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@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2024-10-04 09:34:24 -04:00
parent 04bdba4654
commit 66369db7fd
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -1910,7 +1910,11 @@ 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;