Before updating the display from the console's shadow buffer, the dirty
worker now waits for vblank. This allows several screen updates to pile
up and acts as a rate limiter.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_fb_helper.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index a7ba5b4902d6..017e2f6bd1b9 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -402,8 +402,20 @@ static void drm_fb_helper_dirty_work(struct work_struct *work)
dirty_work);
struct drm_clip_rect *clip = &helper->dirty_clip;
struct drm_clip_rect clip_copy;
+ struct drm_crtc *crtc;
unsigned long flags;
void *vaddr;
+ int ret;
+
+ /* rate-limit update frequency */
+ mutex_lock(&helper->lock);
+ crtc = helper->client.modesets[0].crtc;
+ ret = drm_crtc_vblank_get(crtc);
+ if (!ret) {
+ drm_crtc_wait_one_vblank(crtc);
+ drm_crtc_vblank_put(crtc);
+ }
+ mutex_unlock(&helper->lock);
spin_lock_irqsave(&helper->dirty_lock, flags);
clip_copy = *clip;
--
2.23.0
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