This patch implements a callback function "pre_crc_read" which will
be called before crc read. In this function driver can implement and
preparation work required for successfully reading CRC data.
Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
---
drivers/gpu/drm/drm_debugfs_crc.c | 8 ++++++++
include/drm/drm_crtc.h | 14 ++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index c6a725b79ac6..2b4a737c5aeb 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -278,6 +278,14 @@ static ssize_t crtc_crc_read(struct file *filep, char __user *user_buf,
return 0;
}
+ if (crtc->funcs->pre_crc_read) {
+ ret = crtc->funcs->pre_crc_read(crtc);
+ if (ret) {
+ spin_unlock_irq(&crc->lock);
+ return ret;
+ }
+ }
+
/* Nothing to read? */
while (crtc_crc_data_count(crc) == 0) {
if (filep->f_flags & O_NONBLOCK) {
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 1a6dcbf91744..bae432469616 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -676,6 +676,20 @@ struct drm_crtc_funcs {
*/
int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
size_t *values_cnt);
+ /**
+ * @pre_crc_read:
+ *
+ * Driver callback for performing any preparation work required by
+ * driver before reading CRC
+ *
+ * This callback is optional if the driver does not support CRC
+ * generation or no prework is required before reading the crc
+ *
+ * RETURNS:
+ *
+ * 0 on success or a negative error code on failure.
+ */
+ int (*pre_crc_read)(struct drm_crtc *crtc);
/**
* @atomic_print_state:
--
2.16.2
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