[PATCH] drm/udl: properly set active_16 flag in udl_crtc_page_flip(). (v2)

[Haixia Shi]

When page flipping, we need to mark the new fb as active and unmark the active
flag for the old fb (if different).

Signed-off-by: Haixia Shi <hshi at chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu at chromium.org>
---
 drivers/gpu/drm/udl/udl_modeset.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/udl/udl_modeset.c 
b/drivers/gpu/drm/udl/udl_modeset.c
index 1701f1d..677190a6 100644
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -340,11 +340,11 @@ static int udl_crtc_mode_set(struct drm_crtc *crtc,

        wrptr = udl_dummy_render(wrptr);

-       ufb->active_16 = true;
        if (old_fb) {
                struct udl_framebuffer *uold_fb = to_udl_fb(old_fb);
                uold_fb->active_16 = false;
        }
+       ufb->active_16 = true;
        udl->mode_buf_len = wrptr - buf;

        /* damage all of it */
@@ -373,6 +373,13 @@ static int udl_crtc_page_flip(struct drm_crtc *crtc,
        struct drm_device *dev = crtc->dev;
        unsigned long flags;

+       struct drm_framebuffer *old_fb = crtc->primary->fb;
+       if (old_fb) {
+               struct udl_framebuffer *uold_fb = to_udl_fb(old_fb);
+               uold_fb->active_16 = false;
+       }
+       ufb->active_16 = true;
+
        udl_handle_damage(ufb, 0, 0, fb->width, fb->height);

        spin_lock_irqsave(&dev->event_lock, flags);
-- 
2.2.0.rc0.207.ga3a616c