RE: [PATCH] drm/amdgpu: put SMU into proper state on runpm suspending for BOCO capable platform

["Chen, Guchun" <Guchun.Chen@amd.com>]

[Public]

Thank you Evan. Shall we limit it to dGPU only?

With above concern clarified, the patch is:

Reviewed-by: Guchun Chen <guchun.chen@amd.com>

Regards,
Guchun

-----Original Message-----
From: amd-gfx <amd-gfx-bounces@lists.freedesktop.org> On Behalf Of Evan Quan
Sent: Friday, December 24, 2021 11:17 AM
To: amd-gfx@lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher@amd.com>; Quan, Evan <Evan.Quan@amd.com>; Chen, Guchun <Guchun.Chen@amd.com>
Subject: [PATCH] drm/amdgpu: put SMU into proper state on runpm suspending for BOCO capable platform

By setting mp1_state as PP_MP1_STATE_UNLOAD, MP1 will do some proper cleanups and put itself into a state ready for PNP(which fits the scenario BOCO stands for).
That can address some random resuming failure observed on BOCO capable platforms.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Change-Id: I9804c4f04b6d2ef737b076cabf85d2880179efe2
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index e431c7f10755..ad8370b41e74 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2235,12 +2235,27 @@ static int amdgpu_pmops_runtime_suspend(struct device *dev)
 	if (amdgpu_device_supports_px(drm_dev))
 		drm_dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
 
+	/*
+	 * By setting mp1_state as PP_MP1_STATE_UNLOAD, MP1 will do some
+	 * proper cleanups and put itself into a state ready for PNP. That
+	 * can address some random resuming failure observed on BOCO capable
+	 * platforms.
+	 * TODO: this may be also needed for PX capable platform.
+	 */
+	if (amdgpu_device_supports_boco(drm_dev))
+		adev->mp1_state = PP_MP1_STATE_UNLOAD;
+
 	ret = amdgpu_device_suspend(drm_dev, false);
 	if (ret) {
 		adev->in_runpm = false;
+		if (amdgpu_device_supports_boco(drm_dev))
+			adev->mp1_state = PP_MP1_STATE_NONE;
 		return ret;
 	}
 
+	if (amdgpu_device_supports_boco(drm_dev))
+		adev->mp1_state = PP_MP1_STATE_NONE;
+
 	if (amdgpu_device_supports_px(drm_dev)) {
 		/* Only need to handle PCI state in the driver for ATPX
 		 * PCI core handles it for _PR3.
--
2.29.0