[PATCH v5 2/4] drm/amd: add support to check whether the system is set to s3

[Lazar, Lijo]

Talking from generic API perspective - S3 is considered active for dGPU only if it's going to non-S0 state. If called from anywhere else than suspend op, this should return false.

Thanks,
Lijo
________________________________
From: Limonciello, Mario <Mario.Limonciello at amd.com>
Sent: Wednesday, January 26, 2022 8:37:28 PM
To: Lazar, Lijo <Lijo.Lazar at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Liang, Prike <Prike.Liang at amd.com>
Subject: RE: [PATCH v5 2/4] drm/amd: add support to check whether the system is set to s3


[Public]



That was intentional – shouldn’t dGPU always be going through S3 path currently?



From: Lazar, Lijo <Lijo.Lazar at amd.com>
Sent: Wednesday, January 26, 2022 09:06
To: Limonciello, Mario <Mario.Limonciello at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Liang, Prike <Prike.Liang at amd.com>; Limonciello, Mario <Mario.Limonciello at amd.com>
Subject: Re: [PATCH v5 2/4] drm/amd: add support to check whether the system is set to s3



[Public]



Returns true for dGPU always. Better to keep the whole check under something like this.



if (pm_suspend_target_state != PM_SUSPEND_ON)



Thanks,
Lijo

________________________________

From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org<mailto:amd-gfx-bounces at lists.freedesktop.org>> on behalf of Mario Limonciello <mario.limonciello at amd.com<mailto:mario.limonciello at amd.com>>
Sent: Wednesday, January 26, 2022 9:39:42 AM
To: amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org> <amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>>
Cc: Liang, Prike <Prike.Liang at amd.com<mailto:Prike.Liang at amd.com>>; Limonciello, Mario <Mario.Limonciello at amd.com<mailto:Mario.Limonciello at amd.com>>
Subject: [PATCH v5 2/4] drm/amd: add support to check whether the system is set to s3



This will be used to help make decisions on what to do in
misconfigured systems.

Signed-off-by: Mario Limonciello <mario.limonciello at amd.com<mailto:mario.limonciello at amd.com>>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h      |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 3bc76759c143..f184c88d3d4f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1409,11 +1409,13 @@ int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_sta
 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev);

 void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps);
+bool amdgpu_acpi_is_s3_active(struct amdgpu_device *adev);
 bool amdgpu_acpi_is_s0ix_active(struct amdgpu_device *adev);
 void amdgpu_acpi_detect(void);
 #else
 static inline int amdgpu_acpi_init(struct amdgpu_device *adev) { return 0; }
 static inline void amdgpu_acpi_fini(struct amdgpu_device *adev) { }
+static inline bool amdgpu_acpi_is_s3_active(struct amdgpu_device *adev) { return false };
 static inline bool amdgpu_acpi_is_s0ix_active(struct amdgpu_device *adev) { return false; }
 static inline void amdgpu_acpi_detect(void) { }
 static inline bool amdgpu_acpi_is_power_shift_control_supported(void) { return false; }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 2531da6cbec3..df673062bc03 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -1031,6 +1031,23 @@ void amdgpu_acpi_detect(void)
         }
 }

+/**
+ * amdgpu_acpi_is_s3_active
+ *
+ * @adev: amdgpu_device_pointer
+ *
+ * returns true if supported, false if not.
+ */
+bool amdgpu_acpi_is_s3_active(struct amdgpu_device *adev)
+{
+#if IS_ENABLED(CONFIG_SUSPEND)
+       return !(adev->flags & AMD_IS_APU) ||
+               pm_suspend_target_state == PM_SUSPEND_MEM;
+#else
+       return false;
+#endif
+}
+
 /**
  * amdgpu_acpi_is_s0ix_active
  *
--
2.25.1
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