Re: [PATCH] drm/amdgpu: don't runtime suspend if there are displays attached (v2)

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Ping?  Anyone care to review this?

Alex

On Tue, Apr 19, 2022 at 9:47 AM Alex Deucher <alexdeucher@xxxxxxxxx> wrote:
>
> Ping?
>
> On Wed, Apr 13, 2022 at 4:15 PM Alex Deucher <alexander.deucher@xxxxxxx> wrote:
> >
> > We normally runtime suspend when there are displays attached if they
> > are in the DPMS off state, however, if something wakes the GPU
> > we send a hotplug event on resume (in case any displays were connected
> > while the GPU was in suspend) which can cause userspace to light
> > up the displays again soon after they were turned off.
> >
> > Prior to
> > commit 087451f372bf76 ("drm/amdgpu: use generic fb helpers instead of setting up AMD own's."),
> > the driver took a runtime pm reference when the fbdev emulation was
> > enabled because we didn't implement proper shadowing support for
> > vram access when the device was off so the device never runtime
> > suspended when there was a console bound.  Once that commit landed,
> > we now utilize the core fb helper implementation which properly
> > handles the emulation, so runtime pm now suspends in cases where it did
> > not before.  Ultimately, we need to sort out why runtime suspend in not
> > working in this case for some users, but this should restore similar
> > behavior to before.
> >
> > v2: move check into runtime_suspend
> >
> > Fixes: 087451f372bf76 ("drm/amdgpu: use generic fb helpers instead of setting up AMD own's.")
> > Tested-by: Michele Ballabio <ballabio.m@xxxxxxxxx>
> > Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> > ---
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 107 ++++++++++++++++--------
> >  1 file changed, 72 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > index 4efaa183abcd..97a1aa02d76e 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > @@ -2395,6 +2395,71 @@ static int amdgpu_pmops_restore(struct device *dev)
> >         return amdgpu_device_resume(drm_dev, true);
> >  }
> >
> > +static int amdgpu_runtime_idle_check_display(struct device *dev)
> > +{
> > +       struct pci_dev *pdev = to_pci_dev(dev);
> > +       struct drm_device *drm_dev = pci_get_drvdata(pdev);
> > +       struct amdgpu_device *adev = drm_to_adev(drm_dev);
> > +
> > +       if (adev->mode_info.num_crtc) {
> > +               struct drm_connector *list_connector;
> > +               struct drm_connector_list_iter iter;
> > +               int ret = 0;
> > +
> > +               /* XXX: Return busy if any displays are connected to avoid
> > +                * possible display wake ups after runtime resume due to
> > +                * hotplug events in case any displays were connected while
> > +                * the GPU was in suspend.  Remove this once that is fixed.
> > +                */
> > +               mutex_lock(&drm_dev->mode_config.mutex);
> > +               drm_connector_list_iter_begin(drm_dev, &iter);
> > +               drm_for_each_connector_iter(list_connector, &iter) {
> > +                       if (list_connector->status == connector_status_connected) {
> > +                               ret = -EBUSY;
> > +                               break;
> > +                       }
> > +               }
> > +               drm_connector_list_iter_end(&iter);
> > +               mutex_unlock(&drm_dev->mode_config.mutex);
> > +
> > +               if (ret)
> > +                       return ret;
> > +
> > +               if (amdgpu_device_has_dc_support(adev)) {
> > +                       struct drm_crtc *crtc;
> > +
> > +                       drm_for_each_crtc(crtc, drm_dev) {
> > +                               drm_modeset_lock(&crtc->mutex, NULL);
> > +                               if (crtc->state->active)
> > +                                       ret = -EBUSY;
> > +                               drm_modeset_unlock(&crtc->mutex);
> > +                               if (ret < 0)
> > +                                       break;
> > +                       }
> > +               } else {
> > +                       mutex_lock(&drm_dev->mode_config.mutex);
> > +                       drm_modeset_lock(&drm_dev->mode_config.connection_mutex, NULL);
> > +
> > +                       drm_connector_list_iter_begin(drm_dev, &iter);
> > +                       drm_for_each_connector_iter(list_connector, &iter) {
> > +                               if (list_connector->dpms ==  DRM_MODE_DPMS_ON) {
> > +                                       ret = -EBUSY;
> > +                                       break;
> > +                               }
> > +                       }
> > +
> > +                       drm_connector_list_iter_end(&iter);
> > +
> > +                       drm_modeset_unlock(&drm_dev->mode_config.connection_mutex);
> > +                       mutex_unlock(&drm_dev->mode_config.mutex);
> > +               }
> > +               if (ret)
> > +                       return ret;
> > +       }
> > +
> > +       return 0;
> > +}
> > +
> >  static int amdgpu_pmops_runtime_suspend(struct device *dev)
> >  {
> >         struct pci_dev *pdev = to_pci_dev(dev);
> > @@ -2407,6 +2472,10 @@ static int amdgpu_pmops_runtime_suspend(struct device *dev)
> >                 return -EBUSY;
> >         }
> >
> > +       ret = amdgpu_runtime_idle_check_display(dev);
> > +       if (ret)
> > +               return ret;
> > +
> >         /* wait for all rings to drain before suspending */
> >         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
> >                 struct amdgpu_ring *ring = adev->rings[i];
> > @@ -2516,41 +2585,9 @@ static int amdgpu_pmops_runtime_idle(struct device *dev)
> >                 return -EBUSY;
> >         }
> >
> > -       if (amdgpu_device_has_dc_support(adev)) {
> > -               struct drm_crtc *crtc;
> > -
> > -               drm_for_each_crtc(crtc, drm_dev) {
> > -                       drm_modeset_lock(&crtc->mutex, NULL);
> > -                       if (crtc->state->active)
> > -                               ret = -EBUSY;
> > -                       drm_modeset_unlock(&crtc->mutex);
> > -                       if (ret < 0)
> > -                               break;
> > -               }
> > -
> > -       } else {
> > -               struct drm_connector *list_connector;
> > -               struct drm_connector_list_iter iter;
> > -
> > -               mutex_lock(&drm_dev->mode_config.mutex);
> > -               drm_modeset_lock(&drm_dev->mode_config.connection_mutex, NULL);
> > -
> > -               drm_connector_list_iter_begin(drm_dev, &iter);
> > -               drm_for_each_connector_iter(list_connector, &iter) {
> > -                       if (list_connector->dpms ==  DRM_MODE_DPMS_ON) {
> > -                               ret = -EBUSY;
> > -                               break;
> > -                       }
> > -               }
> > -
> > -               drm_connector_list_iter_end(&iter);
> > -
> > -               drm_modeset_unlock(&drm_dev->mode_config.connection_mutex);
> > -               mutex_unlock(&drm_dev->mode_config.mutex);
> > -       }
> > -
> > -       if (ret == -EBUSY)
> > -               DRM_DEBUG_DRIVER("failing to power off - crtc active\n");
> > +       ret = amdgpu_runtime_idle_check_display(dev);
> > +       if (ret)
> > +               return ret;
> >
> >         pm_runtime_mark_last_busy(dev);
> >         pm_runtime_autosuspend(dev);
> > --
> > 2.35.1
> >



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