[PATCH v5 3/4] drm/amd: Only run s3 or s0ix if system is configured properly

[Mario Limonciello]

This will cause misconfigured systems to not run the GPU suspend
routines.

* In APUs that are properly configured system will go into s2idle.
* In APUs that are intended to be S3 but user selects
  s2idle the GPU will stay fully powered for the suspend.
* In APUs that are intended to be s2idle and system misconfigured
  the GPU will stay fully powered for the suspend.
* In systems that are intended to be s2idle, but AMD dGPU is also
  present, the dGPU will go through S3

Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index b0a620c26ae2..123ec5a07dd5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2309,17 +2309,19 @@ static int amdgpu_pmops_suspend(struct device *dev)
 {
        struct drm_device *drm_dev = dev_get_drvdata(dev);
        struct amdgpu_device *adev = drm_to_adev(drm_dev);
-       int r;
+       int r = 0;
 
        if (amdgpu_acpi_is_s0ix_active(adev))
                adev->in_s0ix = true;
-       else
+       else if (amdgpu_acpi_is_s3_active(adev))
                adev->in_s3 = true;
-       r = amdgpu_device_suspend(drm_dev, true);
-       if (r)
-               return r;
-       if (!adev->in_s0ix)
-               r = amdgpu_asic_reset(adev);
+       if (adev->in_s0ix || adev->in_s3) {
+               r = amdgpu_device_suspend(drm_dev, true);
+               if (r)
+                       return r;
+               if (!adev->in_s0ix)
+                       r = amdgpu_asic_reset(adev);
+       }
        return r;
 }
 
@@ -2327,17 +2329,17 @@ static int amdgpu_pmops_resume(struct device *dev)
 {
        struct drm_device *drm_dev = dev_get_drvdata(dev);
        struct amdgpu_device *adev = drm_to_adev(drm_dev);
-       int r;
+       int r = 0;
 
        /* Avoids registers access if device is physically gone */
        if (!pci_device_is_present(adev->pdev))
                adev->no_hw_access = true;
 
-       r = amdgpu_device_resume(drm_dev, true);
-       if (amdgpu_acpi_is_s0ix_active(adev))
+       if (adev->in_s0ix || adev->in_s3) {
+               r = amdgpu_device_resume(drm_dev, true);
                adev->in_s0ix = false;
-       else
                adev->in_s3 = false;
+       }
        return r;
 }
 
-- 
2.25.1