Re: [PATCH v6 4/4] drm/amd: Only run s3 or s0ix if system is configured properly

["Deucher, Alexander" <Alexander.Deucher@amd.com>]

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[Public]

Series is:
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
________________________________
From: amd-gfx <amd-gfx-bounces@lists.freedesktop.org> on behalf of Mario Limonciello <mario.limonciello@amd.com>
Sent: Wednesday, January 26, 2022 5:58 PM
To: amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>
Cc: Liang, Prike <Prike.Liang@amd.com>; Limonciello, Mario <Mario.Limonciello@amd.com>
Subject: [PATCH v6 4/4] drm/amd: Only run s3 or s0ix if system is configured properly

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.limonciello@amd.com>
---
v5->v6:
 * Move code into prepare vfunc and use DPM_FLAG_SMART_SUSPEND to skip
   suspend code in incorrectly configured systems.
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 922accdd4246..3e581f35f19d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2289,6 +2289,7 @@ static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work)
 static int amdgpu_pmops_prepare(struct device *dev)
 {
         struct drm_device *drm_dev = dev_get_drvdata(dev);
+       struct amdgpu_device *adev = drm_to_adev(drm_dev);

         /* Return a positive number here so
          * DPM_FLAG_SMART_SUSPEND works properly
@@ -2296,6 +2297,13 @@ static int amdgpu_pmops_prepare(struct device *dev)
         if (amdgpu_device_supports_boco(drm_dev))
                 return pm_runtime_suspended(dev);

+       /* if we will not support s3 or s2i for the device
+        *  then skip suspend
+        */
+       if (!amdgpu_acpi_is_s0ix_active(adev) &&
+           !amdgpu_acpi_is_s3_active(adev))
+               return 1;
+
         return 0;
 }

--
2.25.1


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