Add a function so the generic fbdev client can check if the framebuffer does flushing. This is needed to set up deferred I/O.
Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/drm_framebuffer.c | 31 +++++++++++++++++++++++++++++++ include/drm/drm_framebuffer.h | 2 ++ 2 files changed, 33 insertions(+)
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c index ad8f7d308656..a659cff45844 100644 --- a/drivers/gpu/drm/drm_framebuffer.c +++ b/drivers/gpu/drm/drm_framebuffer.c @@ -600,6 +600,37 @@ int drm_mode_dirtyfb_ioctl(struct drm_device *dev, return drm_mode_dirtyfb(dev, data, file_priv, true); }
+/** + * drm_mode_can_dirtyfb - check if the FB does flushing + * @dev: drm device + * @fb_id: Framebuffer id + * @file_priv: drm file + * + * Returns: + * True if the framebuffer does flushing, false otherwise. + */ +bool drm_mode_can_dirtyfb(struct drm_device *dev, u32 fb_id, + struct drm_file *file_priv) +{ + struct drm_framebuffer *fb; + bool ret = false; + + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + return false; + + fb = drm_framebuffer_lookup(dev, file_priv, fb_id); + if (!fb) + return false; + + if (fb->funcs->dirty) + ret = true; + + drm_framebuffer_put(fb); + + return ret; +} +EXPORT_SYMBOL(drm_mode_can_dirtyfb); + /** * drm_fb_release - remove and free the FBs on this file * @priv: drm file for the ioctl diff --git a/include/drm/drm_framebuffer.h b/include/drm/drm_framebuffer.h index c50502c656e5..05d170f4e215 100644 --- a/include/drm/drm_framebuffer.h +++ b/include/drm/drm_framebuffer.h @@ -216,6 +216,8 @@ struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev, void drm_framebuffer_remove(struct drm_framebuffer *fb); void drm_framebuffer_cleanup(struct drm_framebuffer *fb); void drm_framebuffer_unregister_private(struct drm_framebuffer *fb); +bool drm_mode_can_dirtyfb(struct drm_device *dev, u32 fb_id, + struct drm_file *file_priv);
/** * drm_framebuffer_get - acquire a framebuffer reference