drm/mediatek: Use drm_atomic_helper_wait_for_fences
If we use the gem fb helper as the prepare_fb hook, plus the drm_prime.c import helpers now automatically setting obj->resv, we can use the shared helpers to wait for fences instead of rolling our own. Note that this relies on mtk setting drm_fb->obj, which is already done in mtk_drm_framebuffer_init(). Aside: Probably can use the default commit_tail with this again, but I didn't check for that. Reviewed-by: CK Hu <ck.hu@mediatek.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Emil Velikov <emil.velikov@collabora.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: CK Hu <ck.hu@mediatek.com> Cc: Philipp Zabel <p.zabel@pengutronix.de> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mediatek@lists.infradead.org Link: https://patchwork.freedesktop.org/patch/msgid/20190614203615.12639-45-daniel.vetter@ffwll.ch
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