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Date: Fri, 15 Feb 2019 11:01:04 -0500 From: Alex Deucher <alexdeucher@...il.com> To: "Rafael J. Wysocki" <rjw@...ysocki.net> Cc: Alex Deucher <alexander.deucher@....com>, David Zhou <David1.Zhou@....com>, Linux PM <linux-pm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, amd-gfx list <amd-gfx@...ts.freedesktop.org>, Ярослав Семченко <ukrkyi@...il.com>, Christian König <christian.koenig@....com> Subject: Re: [PATCH] gpu: drm: radeon: Set DPM_FLAG_NEVER_SKIP when enabling PM-runtime On Fri, Feb 15, 2019 at 10:39 AM Rafael J. Wysocki <rjw@...ysocki.net> wrote: > > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com> > > On HP ProBook 4540s, if PM-runtime is enabled in the radeon driver > and the direct-complete optimization is used for the radeon device > during system-wide suspend, the system doesn't resume. > > Preventing direct-complete from being used with the radeon device by > setting the DPM_FLAG_NEVER_SKIP driver flag for it makes the problem > go away, which indicates that direct-complete is not safe for the > radeon driver in general and should not be used with it (at least > for now). > > This fixes a regression introduced by commit c62ec4610c40 > ("PM / core: Fix direct_complete handling for devices with no > callbacks") which allowed direct-complete to be applied to > devices without PM callbacks (again) which in turn unlocked > direct-complete for radeon on HP ProBook 4540s. Do other similar drivers like amdgpu and nouveau need the same fix? I'm not too familiar with the direct_complete feature in general. Alex > > Fixes: c62ec4610c40 ("PM / core: Fix direct_complete handling for devices with no callbacks") > Link: https://bugzilla.kernel.org/show_bug.cgi?id=201519 > Reported-by: Ярослав Семченко <ukrkyi@...il.com> > Tested-by: Ярослав Семченко <ukrkyi@...il.com> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> > --- > drivers/gpu/drm/radeon/radeon_kms.c | 1 + > 1 file changed, 1 insertion(+) > > Index: linux-pm/drivers/gpu/drm/radeon/radeon_kms.c > =================================================================== > --- linux-pm.orig/drivers/gpu/drm/radeon/radeon_kms.c > +++ linux-pm/drivers/gpu/drm/radeon/radeon_kms.c > @@ -172,6 +172,7 @@ int radeon_driver_load_kms(struct drm_de > } > > if (radeon_is_px(dev)) { > + dev_pm_set_driver_flags(dev->dev, DPM_FLAG_NEVER_SKIP); > pm_runtime_use_autosuspend(dev->dev); > pm_runtime_set_autosuspend_delay(dev->dev, 5000); > pm_runtime_set_active(dev->dev); > > _______________________________________________ > amd-gfx mailing list > amd-gfx@...ts.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
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