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.
v2: * don't hold helper->lock while waiting for vblank
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- drivers/gpu/drm/drm_fb_helper.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index a7ba5b4902d6..d0cb1fa4f909 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -402,8 +402,18 @@ 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 */ + 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); + }
spin_lock_irqsave(&helper->dirty_lock, flags); clip_copy = *clip;