1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index 9dd879589a2c..9f8312137cad 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -307,10 +307,29 @@ static ssize_t crtc_crc_read(struct file *filep, char __user *user_buf,
         return LINE_LEN(crc->values_cnt);
 }
 
+static unsigned int crtc_crc_poll(struct file *file, poll_table *wait)
+{
+        struct drm_crtc *crtc = file->f_inode->i_private;
+        struct drm_crtc_crc *crc = &crtc->crc;
+        unsigned ret;
+
+        poll_wait(file, &crc->wq, wait);
+
+        spin_lock_irq(&crc->lock);
+        if (crc->source && crtc_crc_data_count(crc))
+                ret = POLLIN | POLLRDNORM;
+        else
+                ret = 0;
+        spin_unlock_irq(&crc->lock);
+
+        return ret;
+}
+
 static const struct file_operations drm_crtc_crc_data_fops = {
         .owner = THIS_MODULE,
         .open = crtc_crc_open,
         .read = crtc_crc_read,
+        .poll = crtc_crc_poll,
         .release = crtc_crc_release,
 };