[AMD Official Use Only]
Reviewed-by: Evan Quan <evan.q...@amd.com>
> -----Original Message-----
> From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> On Behalf Of Alex
> Deucher
> Sent: Thursday, April 21, 2022 11:16 AM
> To: amd-gfx@lists.freedesktop.org
> Cc: Deucher, Alexander <alexander.deuc...@amd.com>; Michele Ballabio
> <ballabi...@gmail.com>
> Subject: [PATCH] drm/amdgpu: don't runtime suspend if there are displays
> attached (v2)
>
> 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
> v3: wake ups -> wakeups in comment, retain pm_runtime behavior in
> runtime_idle callback
>
> Fixes: 087451f372bf76 ("drm/amdgpu: use generic fb helpers instead of
> setting up AMD own's.")
> Tested-by: Michele Ballabio <ballabi...@gmail.com>
> Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 105 ++++++++++++++++---
> -----
> 1 file changed, 70 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..ebd37fb19cdb 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 wakeups 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 +2585,7 @@ 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);
>
> pm_runtime_mark_last_busy(dev);
> pm_runtime_autosuspend(dev);
> --
> 2.35.1
