From: Mandeep Singh Baines msb@chromium.org
The goal of the change is to make sure we send the vblank event on the current vblank. My hope is to fix any races that might be causing flicker. After this change I only see a flicker in the transition plymouth and X11.
Simplified the code by tracking vblank events on a per-crtc basis. This allowed me to remove all error paths from the callback. It also allowed me to remove the vblank wait from the callback.
Signed-off-by: Mandeep Singh Baines msb@chromium.org Signed-off-by: Gustavo Padovan gustavo.padovan@collabora.co.uk --- drivers/gpu/drm/exynos/exynos_drm_crtc.c | 92 +++++++++++++++----------------- drivers/gpu/drm/exynos/exynos_drm_drv.c | 13 ----- drivers/gpu/drm/exynos/exynos_drm_drv.h | 6 +-- 3 files changed, 44 insertions(+), 67 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c index a85c451..b2a4b84 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c +++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c @@ -34,9 +34,8 @@ static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode) if (mode > DRM_MODE_DPMS_ON) { /* wait for the completion of page flip. */ if (!wait_event_timeout(exynos_crtc->pending_flip_queue, - !atomic_read(&exynos_crtc->pending_flip), - HZ/20)) - atomic_set(&exynos_crtc->pending_flip, 0); + (exynos_crtc->event == NULL), HZ/20)) + exynos_crtc->event = NULL; drm_crtc_vblank_off(crtc); }
@@ -166,11 +165,10 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc, uint32_t page_flip_flags) { struct drm_device *dev = crtc->dev; - struct exynos_drm_private *dev_priv = dev->dev_private; struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc); struct drm_framebuffer *old_fb = crtc->primary->fb; unsigned int crtc_w, crtc_h; - int ret = -EINVAL; + int ret;
/* when the page flip is requested, crtc's dpms should be on */ if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) { @@ -178,48 +176,49 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc, return -EINVAL; }
- mutex_lock(&dev->struct_mutex); + if (!event) + return -EINVAL;
- if (event) { - /* - * the pipe from user always is 0 so we can set pipe number - * of current owner to event. - */ - event->pipe = exynos_crtc->pipe; + spin_lock_irq(&dev->event_lock); + if (exynos_crtc->event) { + ret = -EBUSY; + goto out; + }
- ret = drm_vblank_get(dev, exynos_crtc->pipe); - if (ret) { - DRM_DEBUG("failed to acquire vblank counter\n"); + ret = drm_vblank_get(dev, exynos_crtc->pipe); + if (ret) { + DRM_DEBUG("failed to acquire vblank counter\n"); + goto out; + }
- goto out; - } + exynos_crtc->event = event; + spin_unlock_irq(&dev->event_lock);
+ /* + * the pipe from user always is 0 so we can set pipe number + * of current owner to event. + */ + event->pipe = exynos_crtc->pipe; + + crtc->primary->fb = fb; + crtc_w = fb->width - crtc->x; + crtc_h = fb->height - crtc->y; + ret = exynos_update_plane(crtc->primary, crtc, fb, 0, 0, + crtc_w, crtc_h, crtc->x, crtc->y, + crtc_w, crtc_h); + if (ret) { + crtc->primary->fb = old_fb; spin_lock_irq(&dev->event_lock); - list_add_tail(&event->base.link, - &dev_priv->pageflip_event_list); - atomic_set(&exynos_crtc->pending_flip, 1); + exynos_crtc->event = NULL; + drm_vblank_put(dev, exynos_crtc->pipe); spin_unlock_irq(&dev->event_lock); - - crtc->primary->fb = fb; - crtc_w = fb->width - crtc->x; - crtc_h = fb->height - crtc->y; - ret = exynos_update_plane(crtc->primary, crtc, fb, 0, 0, - crtc_w, crtc_h, crtc->x, crtc->y, - crtc_w, crtc_h); - if (ret) { - crtc->primary->fb = old_fb; - - spin_lock_irq(&dev->event_lock); - drm_vblank_put(dev, exynos_crtc->pipe); - list_del(&event->base.link); - atomic_set(&exynos_crtc->pending_flip, 0); - spin_unlock_irq(&dev->event_lock); - - goto out; - } + return ret; } + + return 0; + out: - mutex_unlock(&dev->struct_mutex); + spin_unlock_irq(&dev->event_lock); return ret; }
@@ -315,7 +314,6 @@ struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev, return ERR_PTR(-ENOMEM);
init_waitqueue_head(&exynos_crtc->pending_flip_queue); - atomic_set(&exynos_crtc->pending_flip, 0);
exynos_crtc->dpms = DRM_MODE_DPMS_OFF; exynos_crtc->pipe = pipe; @@ -382,26 +380,20 @@ void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int pipe) void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int pipe) { struct exynos_drm_private *dev_priv = dev->dev_private; - struct drm_pending_vblank_event *e, *t; struct drm_crtc *drm_crtc = dev_priv->crtc[pipe]; struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(drm_crtc); unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags); + if (exynos_crtc->event) {
- list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list, - base.link) { - /* if event's pipe isn't same as crtc then ignore it. */ - if (pipe != e->pipe) - continue; - - list_del(&e->base.link); - drm_send_vblank_event(dev, -1, e); + drm_send_vblank_event(dev, -1, exynos_crtc->event); drm_vblank_put(dev, pipe); - atomic_set(&exynos_crtc->pending_flip, 0); wake_up(&exynos_crtc->pending_flip_queue); + }
+ exynos_crtc->event = NULL; spin_unlock_irqrestore(&dev->event_lock, flags); }
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 1bcbe07..737164d 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -61,7 +61,6 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags) if (!private) return -ENOMEM;
- INIT_LIST_HEAD(&private->pageflip_event_list); dev_set_drvdata(dev->dev, dev); dev->dev_private = (void *)private;
@@ -237,25 +236,13 @@ static void exynos_drm_preclose(struct drm_device *dev,
static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file) { - struct exynos_drm_private *private = dev->dev_private; - struct drm_pending_vblank_event *v, *vt; struct drm_pending_event *e, *et; unsigned long flags;
if (!file->driver_priv) return;
- /* Release all events not unhandled by page flip handler. */ spin_lock_irqsave(&dev->event_lock, flags); - list_for_each_entry_safe(v, vt, &private->pageflip_event_list, - base.link) { - if (v->base.file_priv == file) { - list_del(&v->base.link); - drm_vblank_put(dev, v->pipe); - v->base.destroy(&v->base); - } - } - /* Release all events handled by page flip handler but not freed. */ list_for_each_entry_safe(e, et, &file->event_list, link) { list_del(&e->link); diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index d490b49..7411af2 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -216,6 +216,7 @@ enum exynos_crtc_mode { * this pipe value. * @dpms: store the crtc dpms value * @mode: store the crtc mode value + * @event: vblank event that is currently queued for flip * @ops: pointer to callbacks for exynos drm specific functionality * @ctx: A pointer to the crtc's implementation specific context */ @@ -226,7 +227,7 @@ struct exynos_drm_crtc { unsigned int dpms; enum exynos_crtc_mode mode; wait_queue_head_t pending_flip_queue; - atomic_t pending_flip; + struct drm_pending_vblank_event *event; struct exynos_drm_crtc_ops *ops; void *ctx; }; @@ -256,9 +257,6 @@ struct drm_exynos_file_private { struct exynos_drm_private { struct drm_fb_helper *fb_helper;
- /* list head for new event to be added. */ - struct list_head pageflip_event_list; - /* * created crtc object would be contained at this array and * this array is used to be aware of which crtc did it request vblank.