Hi Lucas,
On Fri, Aug 12, 2016 at 11:07:14AM +0200, Lucas Stach wrote:
>This adds the unlocked variant of drm_atomic_helper_disable_all(),
>which takes all the required modeset locks itself. This is intended
>to be used when shutting down the driver, without retaining any
>state.
>
Is this meant to be analogous to:
drm_for_each_plane(plane, dev)
drm_plane_force_disable(plane);
drm_for_each_crtc(crtc, dev)
drm_crtc_force_disable(crtc);
?
I may have misunderstood the intention here, but it seems like this
patch only disables the outputs and doesn't disable planes or
remove their framebuffers (which I think we'd want for driver
shutdown).
Thanks,
Brian
>Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
>---
> drivers/gpu/drm/drm_atomic_helper.c | 43 +++++++++++++++++++++++++++++++++++++
> include/drm/drm_atomic_helper.h | 1 +
> 2 files changed, 44 insertions(+)
>
>diff --git a/drivers/gpu/drm/drm_atomic_helper.c
>b/drivers/gpu/drm/drm_atomic_helper.c
>index 99365087645b..6673021ab21e 100644
>--- a/drivers/gpu/drm/drm_atomic_helper.c
>+++ b/drivers/gpu/drm/drm_atomic_helper.c
>@@ -2435,6 +2435,49 @@ free:
> EXPORT_SYMBOL(drm_atomic_helper_disable_all);
>
> /**
>+ * drm_atomic_helper_disable_all_unlocked - disable all currently active
>+ * outputs taking the modeset locks itself
>+ * @dev: DRM device
>+ *
>+ * Loops through all connectors, finding those that aren't turned off and then
>+ * turns them off by setting their DPMS mode to OFF and deactivating the CRTC
>+ * that they are connected to.
>+ *
>+ * This is used for example when shutting down the DRM device.
>+ *
>+ * Returns:
>+ * 0 on success or a negative error code on failure.
>+ */
>+int drm_atomic_helper_disable_all_unlocked(struct drm_device *dev)
>+{
>+ struct drm_modeset_acquire_ctx ctx;
>+ int err;
>+
>+ drm_modeset_acquire_init(&ctx, 0);
>+
>+retry:
>+ err = drm_modeset_lock_all_ctx(dev, &ctx);
>+ if (err < 0)
>+ goto unlock;
>+
>+ err = drm_atomic_helper_disable_all(dev, &ctx);
>+ if (err < 0)
>+ goto unlock;
>+
>+unlock:
>+ if (err == -EDEADLK) {
>+ drm_modeset_backoff(&ctx);
>+ goto retry;
>+ }
>+
>+ drm_modeset_drop_locks(&ctx);
>+ drm_modeset_acquire_fini(&ctx);
>+
>+ return err;
>+}
>+EXPORT_SYMBOL(drm_atomic_helper_disable_all_unlocked);
>+
>+/**
> * drm_atomic_helper_suspend - subsystem-level suspend helper
> * @dev: DRM device
> *
>diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
>index d86ae5dcd7b4..104d310c2c70 100644
>--- a/include/drm/drm_atomic_helper.h
>+++ b/include/drm/drm_atomic_helper.h
>@@ -99,6 +99,7 @@ int __drm_atomic_helper_set_config(struct drm_mode_set *set,
>
> int drm_atomic_helper_disable_all(struct drm_device *dev,
> struct drm_modeset_acquire_ctx *ctx);
>+int drm_atomic_helper_disable_all_unlocked(struct drm_device *dev);
> struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev);
> int drm_atomic_helper_resume(struct drm_device *dev,
> struct drm_atomic_state *state);
>--
>2.8.1
>
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