linux-kernel - [PATCH 5.16 024/126] drm/amdgpu: fix a potential GPU hang on cyan skillfish

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Message-Id: <20220207103804.991012702@linuxfoundation.org>
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))