drm/exynos: support drm_wait_vblank feature for VIDI

this patch adds drm_wait_vblank support to Virtual Display module
so user can use DRM_IOCT_WAIT_VBLANK ioctl with this patch.
for this, you should set _DRM_VBLANK_EXYNOS_VIDI flags to
vblwait->request.type

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

2 files changed, 31 insertions, 1 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
index c95f7dedb8a0..54b44159caf1 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
@@ -56,6 +56,7 @@ struct vidi_context {
         unsigned int                    connected;
         bool                            vblank_on;
         bool                            suspended;
+        bool                            direct_vblank;
         struct work_struct              work;
         struct mutex                    lock;
 };
@@ -224,6 +225,15 @@ static int vidi_enable_vblank(struct device *dev)
         if (!test_and_set_bit(0, &ctx->irq_flags))
                 ctx->vblank_on = true;
 
+        ctx->direct_vblank = true;
+
+        /*
+         * in case of page flip request, vidi_finish_pageflip function
+         * will not be called because direct_vblank is true and then
+         * that function will be called by overlay_ops->commit callback
+         */
+        schedule_work(&ctx->work);
+
         return 0;
 }
 
@@ -425,7 +435,17 @@ static void vidi_fake_vblank_handler(struct work_struct *work)
         /* refresh rate is about 50Hz. */
         usleep_range(16000, 20000);
 
-        drm_handle_vblank(subdrv->drm_dev, manager->pipe);
+        mutex_lock(&ctx->lock);
+
+        if (ctx->direct_vblank) {
+                drm_handle_vblank(subdrv->drm_dev, manager->pipe);
+                ctx->direct_vblank = false;
+                mutex_unlock(&ctx->lock);
+                return;
+        }
+
+        mutex_unlock(&ctx->lock);
+
         vidi_finish_pageflip(subdrv->drm_dev, manager->pipe);
 }
 
diff --git a/include/drm/exynos_drm.h b/include/drm/exynos_drm.h
index c20b00181530..0d1c503042d5 100644
--- a/include/drm/exynos_drm.h
+++ b/include/drm/exynos_drm.h
@@ -107,6 +107,16 @@ struct drm_exynos_vidi_connection {
         uint64_t edid;
 };
 
+/* Indicate Exynos specific vblank flags */
+enum e_drm_exynos_vblank {
+        /*
+         * this flags is used for Virtual Display module
+         * to use DRM_IOCTL_WAIT_VBLANK feature. for this,
+         * user should set this flag to vblwait->request.type
+         */
+        _DRM_VBLANK_EXYNOS_VIDI = 2,
+};
+
 /* memory type definitions. */
 enum e_drm_exynos_gem_mem_type {
         /* Physically Continuous memory and used as default. */