drm: crc: Wait for a frame before returning from open()
Don't return from the open() call on the crc/data file until the HW has
produced a first frame, as there's great variability in when the HW is
able to do that and userspace shouldn't have to guess when this specific
HW is ready to start giving frame CRCs.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170102125912.22305-3-tomeu.vizoso@collabora.com
diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index 68b171a..8b0eeee 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -125,6 +125,12 @@
.write = crc_control_write
};
+static int crtc_crc_data_count(struct drm_crtc_crc *crc)
+{
+ assert_spin_locked(&crc->lock);
+ return CIRC_CNT(crc->head, crc->tail, DRM_CRC_ENTRIES_NR);
+}
+
static int crtc_crc_open(struct inode *inode, struct file *filep)
{
struct drm_crtc *crtc = inode->i_private;
@@ -160,8 +166,19 @@
crc->entries = entries;
crc->values_cnt = values_cnt;
crc->opened = true;
+
+ /*
+ * Only return once we got a first frame, so userspace doesn't have to
+ * guess when this particular piece of HW will be ready to start
+ * generating CRCs.
+ */
+ ret = wait_event_interruptible_lock_irq(crc->wq,
+ crtc_crc_data_count(crc),
+ crc->lock);
spin_unlock_irq(&crc->lock);
+ WARN_ON(ret);
+
return 0;
err_disable:
@@ -189,12 +206,6 @@
return 0;
}
-static int crtc_crc_data_count(struct drm_crtc_crc *crc)
-{
- assert_spin_locked(&crc->lock);
- return CIRC_CNT(crc->head, crc->tail, DRM_CRC_ENTRIES_NR);
-}
-
/*
* 1 frame field of 10 chars plus a number of CRC fields of 10 chars each, space
* separated, with a newline at the end and null-terminated.