drm/amdgpu: don't use BACO for reset in S3

commit ebc002e3ee78409c42156e62e4e27ad1d09c5a75 upstream.

Seems to cause a reboots or hangs on some systems.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1924
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1953
Fixes: daf8de0874ab5b ("drm/amdgpu: always reset the asic in suspend (v2)")
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
index 08362d5..a68496b 100644 (file)
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -1045,6 +1045,17 @@ bool amdgpu_dpm_is_baco_supported(struct amdgpu_device *adev)
 
        if (!pp_funcs || !pp_funcs->get_asic_baco_capability)
                return false;
+       /* Don't use baco for reset in S3.
+        * This is a workaround for some platforms
+        * where entering BACO during suspend
+        * seems to cause reboots or hangs.
+        * This might be related to the fact that BACO controls
+        * power to the whole GPU including devices like audio and USB.
+        * Powering down/up everything may adversely affect these other
+        * devices.  Needs more investigation.
+        */
+       if (adev->in_s3)
+               return false;
 
        if (pp_funcs->get_asic_baco_capability(pp_handle, &baco_cap))
                return false;