linux-kernel - [PATCH 5.1 74/96] drm/amdgpu: Dont skip display settings in hwmgr

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Date:   Mon,  8 Jul 2019 17:13:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Huang Rui <ray.huang@....com>, Rex Zhu <Rex.Zhu@....com>,
        Likun Gao <Likun.Gao@....com>, Lyude Paul <lyude@...hat.com>
Subject: [PATCH 5.1 74/96] drm/amdgpu: Dont skip display settings in hwmgr_resume()

From: Lyude Paul <lyude@...hat.com>

commit 688f3d1ebedffa310b6591bd1b63fa0770d945fe upstream.

I'm not entirely sure why this is, but for some reason:

921935dc6404 ("drm/amd/powerplay: enforce display related settings only on needed")

Breaks runtime PM resume on the Radeon PRO WX 3100 (Lexa) in one the
pre-production laptops I have. The issue manifests as the following
messages in dmesg:

[drm] UVD and UVD ENC initialized successfully.
amdgpu 0000:3b:00.0: [drm:amdgpu_ring_test_helper [amdgpu]] *ERROR* ring vce1 test failed (-110)
[drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of IP block <vce_v3_0> failed -110
[drm:amdgpu_device_resume [amdgpu]] *ERROR* amdgpu_device_ip_resume failed (-110).

And happens after about 6-10 runtime PM suspend/resume cycles (sometimes
sooner, if you're lucky!). Unfortunately I can't seem to pin down
precisely which part in psm_adjust_power_state_dynamic that is causing
the issue, but not skipping the display setting setup seems to fix it.
Hopefully if there is a better fix for this, this patch will spark
discussion around it.

Fixes: 921935dc6404 ("drm/amd/powerplay: enforce display related settings only on needed")
Cc: Evan Quan <evan.quan@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: Huang Rui <ray.huang@....com>
Cc: Rex Zhu <Rex.Zhu@....com>
Cc: Likun Gao <Likun.Gao@....com>
Cc: <stable@...r.kernel.org> # v5.1+
Signed-off-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
@@ -325,7 +325,7 @@ int hwmgr_resume(struct pp_hwmgr *hwmgr)
 	if (ret)
 		return ret;

-	ret = psm_adjust_power_state_dynamic(hwmgr, true, NULL);
+	ret = psm_adjust_power_state_dynamic(hwmgr, false, NULL);

 	return ret;
 }