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Date: Mon, 7 Feb 2022 12:05:55 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Lang Yu <Lang.Yu@....com>, Lijo Lazar <lijo.lazar@....com>, Alex Deucher <alexander.deucher@....com> Subject: [PATCH 5.16 024/126] drm/amdgpu: fix a potential GPU hang on cyan skillfish From: Lang Yu <Lang.Yu@....com> commit bca52455a3c07922ee976714b00563a13a29ab15 upstream. We observed a GPU hang when querying GMC CG state(i.e., cat amdgpu_pm_info) on cyan skillfish. Acctually, cyan skillfish doesn't support any CG features. Just prevent it from accessing GMC CG registers. Signed-off-by: Lang Yu <Lang.Yu@....com> Reviewed-by: Lijo Lazar <lijo.lazar@....com> Signed-off-by: Alex Deucher <alexander.deucher@....com> Cc: stable@...r.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c @@ -1147,6 +1147,9 @@ static void gmc_v10_0_get_clockgating_st { struct amdgpu_device *adev = (struct amdgpu_device *)handle; + if (adev->ip_versions[GC_HWIP][0] == IP_VERSION(10, 1, 3)) + return; + adev->mmhub.funcs->get_clockgating(adev, flags); if (adev->ip_versions[ATHUB_HWIP][0] >= IP_VERSION(2, 1, 0))
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