drm: omapdrm: Implement asynchronous commit support

Implement a custom .atomic_commit() handler that supports asynchronous
commits using a work queue. This can be used for userspace-driven
asynchronous commits, as well as for an atomic page flip implementation.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index ec0ae42..72a5a88 100644 (file)
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -17,6 +17,9 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/wait.h>
+
+#include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_helper.h>
@@ -56,11 +59,117 @@ static void omap_fb_output_poll_changed(struct drm_device *dev)
                drm_fb_helper_hotplug_event(priv->fbdev);
 }
 
+struct omap_atomic_state_commit {
+       struct work_struct work;
+       struct drm_device *dev;
+       struct drm_atomic_state *state;
+       u32 crtcs;
+};
+
+static void omap_atomic_complete(struct omap_atomic_state_commit *commit)
+{
+       struct drm_device *dev = commit->dev;
+       struct omap_drm_private *priv = dev->dev_private;
+       struct drm_atomic_state *old_state = commit->state;
+
+       /* Apply the atomic update. */
+       drm_atomic_helper_commit_modeset_disables(dev, old_state);
+       drm_atomic_helper_commit_planes(dev, old_state);
+       drm_atomic_helper_commit_modeset_enables(dev, old_state);
+
+       drm_atomic_helper_wait_for_vblanks(dev, old_state);
+
+       drm_atomic_helper_cleanup_planes(dev, old_state);
+
+       drm_atomic_state_free(old_state);
+
+       /* Complete the commit, wake up any waiter. */
+       spin_lock(&priv->commit.lock);
+       priv->commit.pending &= ~commit->crtcs;
+       spin_unlock(&priv->commit.lock);
+
+       wake_up_all(&priv->commit.wait);
+
+       kfree(commit);
+}
+
+static void omap_atomic_work(struct work_struct *work)
+{
+       struct omap_atomic_state_commit *commit =
+               container_of(work, struct omap_atomic_state_commit, work);
+
+       omap_atomic_complete(commit);
+}
+
+static bool omap_atomic_is_pending(struct omap_drm_private *priv,
+                                  struct omap_atomic_state_commit *commit)
+{
+       bool pending;
+
+       spin_lock(&priv->commit.lock);
+       pending = priv->commit.pending & commit->crtcs;
+       spin_unlock(&priv->commit.lock);
+
+       return pending;
+}
+
+static int omap_atomic_commit(struct drm_device *dev,
+                             struct drm_atomic_state *state, bool async)
+{
+       struct omap_drm_private *priv = dev->dev_private;
+       struct omap_atomic_state_commit *commit;
+       unsigned int i;
+       int ret;
+
+       ret = drm_atomic_helper_prepare_planes(dev, state);
+       if (ret)
+               return ret;
+
+       /* Allocate the commit object. */
+       commit = kzalloc(sizeof(*commit), GFP_KERNEL);
+       if (commit == NULL) {
+               ret = -ENOMEM;
+               goto error;
+       }
+
+       INIT_WORK(&commit->work, omap_atomic_work);
+       commit->dev = dev;
+       commit->state = state;
+
+       /* Wait until all affected CRTCs have completed previous commits and
+        * mark them as pending.
+        */
+       for (i = 0; i < dev->mode_config.num_crtc; ++i) {
+               if (state->crtcs[i])
+                       commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
+       }
+
+       wait_event(priv->commit.wait, !omap_atomic_is_pending(priv, commit));
+
+       spin_lock(&priv->commit.lock);
+       priv->commit.pending |= commit->crtcs;
+       spin_unlock(&priv->commit.lock);
+
+       /* Swap the state, this is the point of no return. */
+       drm_atomic_helper_swap_state(dev, state);
+
+       if (async)
+               schedule_work(&commit->work);
+       else
+               omap_atomic_complete(commit);
+
+       return 0;
+
+error:
+       drm_atomic_helper_cleanup_planes(dev, state);
+       return ret;
+}
+
 static const struct drm_mode_config_funcs omap_mode_config_funcs = {
        .fb_create = omap_framebuffer_create,
        .output_poll_changed = omap_fb_output_poll_changed,
        .atomic_check = drm_atomic_helper_check,
-       .atomic_commit = drm_atomic_helper_commit,
+       .atomic_commit = omap_atomic_commit,
 };
 
 static int get_connector_type(struct omap_dss_device *dssdev)
@@ -521,6 +630,8 @@ static int dev_load(struct drm_device *dev, unsigned long flags)
        dev->dev_private = priv;
 
        priv->wq = alloc_ordered_workqueue("omapdrm", 0);
+       init_waitqueue_head(&priv->commit.wait);
+       spin_lock_init(&priv->commit.lock);
 
        spin_lock_init(&priv->list_lock);
        INIT_LIST_HEAD(&priv->obj_list);

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.h b/drivers/gpu/drm/omapdrm/omap_drv.h
index 6448fa8..21c3929 100644 (file)
--- a/drivers/gpu/drm/omapdrm/omap_drv.h
+++ b/drivers/gpu/drm/omapdrm/omap_drv.h
@@ -23,6 +23,7 @@
 #include <linux/module.h>
 #include <linux/platform_data/omap_drm.h>
 #include <linux/types.h>
+#include <linux/wait.h>
 #include <video/omapdss.h>
 
 #include <drm/drmP.h>
@@ -105,6 +106,13 @@ struct omap_drm_private {
        struct list_head irq_list;    /* list of omap_drm_irq */
        uint32_t vblank_mask;         /* irq bits set for userspace vblank */
        struct omap_drm_irq error_handler;
+
+       /* atomic commit */
+       struct {
+               wait_queue_head_t wait;
+               u32 pending;
+               spinlock_t lock;        /* Protects commit.pending */
+       } commit;
 };