[PATCH] drm/amdgpu: allow more APUs to do mode2 reset when go to S4 (v2)

[Tim Huang]

Skip mode2 reset only for IMU enabled APUs when do S4 to
fix the possible S4 regression issues on old ASICs.

v2:
Update this commit message to add Fixes and Link tags.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2483
Fixes: 2bedd3f21b30 ("drm/amdgpu: skip ASIC reset for APUs when go to S4")
Signed-off-by: Tim Huang <tim.huang at amd.com>
Tested-by: Yuan Perry <Perry.Yuan at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 0f7cd3e8e00b..edaf3ded4a04 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -981,7 +981,12 @@ static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
  */
 bool amdgpu_acpi_should_gpu_reset(struct amdgpu_device *adev)
 {
-	if (adev->flags & AMD_IS_APU)
+	if ((adev->flags & AMD_IS_APU) &&
+	    adev->gfx.imu.funcs) /* Not need to do mode2 reset for IMU enabled APUs */
+		return false;
+
+	if ((adev->flags & AMD_IS_APU) &&
+	    amdgpu_acpi_is_s3_active(adev))
 		return false;
 
 	if (amdgpu_sriov_vf(adev))
-- 
2.25.1