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drm/nouveau/kms: reference vblank for crtc during pageflip. 

Need to drm_vblank_get/put() the crtc involved in a
pending pageflip, or we might not get vblank irqs and
updates of vblank counts and timestamps for pageflip
events and flip completion.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org
hifive-unleashed-5.1
Mario Kleiner 2014-06-11 09:51:23 +02:00 committed by Ben Skeggs
parent 86899b39b5
commit ba124a4105
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/nouveau/nouveau_display.c
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@ -736,6 +736,9 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
fb->bits_per_pixel, fb->pitches[0], crtc->x, crtc->y,
new_bo->bo.offset };
/* Keep vblanks on during flip, for the target crtc of this flip */
drm_vblank_get(dev, nouveau_crtc(crtc)->index);
/* Emit a page flip */
if (nv_device(drm->device)->card_type >= NV_50) {
ret = nv50_display_flip_next(crtc, fb, chan, swap_interval);
@ -779,6 +782,7 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
return 0;
fail_unreserve:
drm_vblank_put(dev, nouveau_crtc(crtc)->index);
ttm_bo_unreserve(&old_bo->bo);
fail_unpin:
mutex_unlock(&chan->cli->mutex);
@ -817,6 +821,9 @@ nouveau_finish_page_flip(struct nouveau_channel *chan,
drm_send_vblank_event(dev, crtcid, s->event);
}
/* Give up ownership of vblank for page-flipped crtc */
drm_vblank_put(dev, s->crtc);
list_del(&s->head);
if (ps)
*ps = *s;