The new interface drm_crtc_has_vblank() return true if vblanking has
been initialized for a certain CRTC, or false otherwise. This function
will be useful for initializing CRTC state.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_vblank.c | 21 +++++++++++++++++++++
include/drm/drm_vblank.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 1659b13b178c..c20102899411 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -501,6 +501,27 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
}
EXPORT_SYMBOL(drm_vblank_init);
+/**
+ * drm_crtc_has_vblank - test if vblanking has been initialized for
+ * a CRTC
+ * @crtc: the CRTC
+ *
+ * Drivers may call this function to test if vblank support is
+ * initialized for a CRTC. For most hardware this means that vblanking
+ * can also be enabled on the CRTC.
+ *
+ * Returns:
+ * True if vblanking has been initialized for the given CRTC, false
+ * otherwise.
+ */
+bool drm_crtc_has_vblank(const struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+
+ return crtc->index < dev->num_crtcs;
+}
+EXPORT_SYMBOL(drm_crtc_has_vblank);
+
/**
* drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
* @crtc: which CRTC's vblank waitqueue to retrieve
diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
index c16c44052b3d..531a6bc12b7e 100644
--- a/include/drm/drm_vblank.h
+++ b/include/drm/drm_vblank.h
@@ -206,6 +206,7 @@ struct drm_vblank_crtc {
};
int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
+bool drm_crtc_has_vblank(const struct drm_crtc *crtc);
u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
ktime_t *vblanktime);
--
2.24.1
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