diff options
| author | John Keeping <john@metanate.com> | 2016-01-19 10:46:58 +0000 |
|---|---|---|
| committer | Mark Yao <mark.yao@rock-chips.com> | 2016-01-20 08:55:43 +0800 |
| commit | c240906d36653944d5c049df7ce667a7e8bea6ac (patch) | |
| tree | c1ffb141c43b18a9c925f6e88ee5a1e296ac43ed /drivers/gpu | |
| parent | 484bb6c969523aa547d854bb57104339ee4aa800 (diff) | |
| download | linux-c240906d36653944d5c049df7ce667a7e8bea6ac.tar.bz2 | |
drm/atomic-helper: Export framebuffer_changed()
The Rockchip driver cannot use drm_atomic_helper_wait_for_vblanks()
because it has hardware counters for neither vblanks nor scanlines.
In order to simplify re-implementing the functionality for this driver,
export the framebuffer_changed() helper so it can be reused.
Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_atomic_helper.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 57cccd68ca52..7c523060a076 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -946,9 +946,23 @@ static void wait_for_fences(struct drm_device *dev, } } -static bool framebuffer_changed(struct drm_device *dev, - struct drm_atomic_state *old_state, - struct drm_crtc *crtc) +/** + * drm_atomic_helper_framebuffer_changed - check if framebuffer has changed + * @dev: DRM device + * @old_state: atomic state object with old state structures + * @crtc: DRM crtc + * + * Checks whether the framebuffer used for this CRTC changes as a result of + * the atomic update. This is useful for drivers which cannot use + * drm_atomic_helper_wait_for_vblanks() and need to reimplement its + * functionality. + * + * Returns: + * true if the framebuffer changed. + */ +bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev, + struct drm_atomic_state *old_state, + struct drm_crtc *crtc) { struct drm_plane *plane; struct drm_plane_state *old_plane_state; @@ -965,6 +979,7 @@ static bool framebuffer_changed(struct drm_device *dev, return false; } +EXPORT_SYMBOL(drm_atomic_helper_framebuffer_changed); /** * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs @@ -999,7 +1014,8 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev, if (old_state->legacy_cursor_update) continue; - if (!framebuffer_changed(dev, old_state, crtc)) + if (!drm_atomic_helper_framebuffer_changed(dev, + old_state, crtc)) continue; ret = drm_crtc_vblank_get(crtc); |