RE: [PATCH] drm/amdgpu: don't do resets on APUs which don't support it

["Chen, Guchun" <Guchun.Chen@xxxxxxx>]

Acked-by: Guchun Chen <guchun.chen@xxxxxxx>

Regards,
Guchun

-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Alex Deucher
Sent: Thursday, January 13, 2022 12:01 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>; stable@xxxxxxxxxxxxxxx
Subject: [PATCH] drm/amdgpu: don't do resets on APUs which don't support it

It can cause a hang.  This is normally not enabled for GPU hangs on these asics, but was recently enabled for handling aborted suspends.  This causes hangs on some platforms on suspend.

Fixes: daf8de0874ab5b ("drm/amdgpu: always reset the asic in suspend (v2)")
Cc: stable@xxxxxxxxxxxxxxx
Bug: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fdrm%2Famd%2F-%2Fissues%2F1858&amp;data=04%7C01%7Cguchun.chen%40amd.com%7C2462de07d629440dbe5d08d9d6495d8a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637776432879987023%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=WrqnZKTZCDx729gO5TXEr6IOhBFa%2FkGqMa5VDjbSx%2Bk%3D&amp;reserved=0
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/cik.c | 4 ++++  drivers/gpu/drm/amd/amdgpu/vi.c  | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
index 54f28c075f21..f10ce740a29c 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -1428,6 +1428,10 @@ static int cik_asic_reset(struct amdgpu_device *adev)  {
 	int r;
 
+	/* APUs don't have full asic reset */
+	if (adev->flags & AMD_IS_APU)
+		return 0;
+
 	if (cik_asic_reset_method(adev) == AMD_RESET_METHOD_BACO) {
 		dev_info(adev->dev, "BACO reset\n");
 		r = amdgpu_dpm_baco_reset(adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c index fe9a7cc8d9eb..6645ebbd2696 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -956,6 +956,10 @@ static int vi_asic_reset(struct amdgpu_device *adev)  {
 	int r;
 
+	/* APUs don't have full asic reset */
+	if (adev->flags & AMD_IS_APU)
+		return 0;
+
 	if (vi_asic_reset_method(adev) == AMD_RESET_METHOD_BACO) {
 		dev_info(adev->dev, "BACO reset\n");
 		r = amdgpu_dpm_baco_reset(adev);
--
2.34.1