Re: [PATCH] gpu: drm: radeon: Set DPM_FLAG_NEVER_SKIP when enabling PM-runtime

[Alex Deucher <alexdeucher@gmail.com>]

On Fri, Feb 15, 2019 at 10:39 AM Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
>
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.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@gmail.com>
> Tested-by: Ярослав Семченко <ukrkyi@gmail.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.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);
>
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