Changing the gain affects the black-level through the device;
the gain should therefore not be changed during a BLC procedure.
If the gain changes, then the BLC routine should be re-run
in some scenarios.
Signed-off-by: Arec Kao <arec.kao@xxxxxxxxx>
---
.../userspace-api/media/v4l/ext-ctrls-image-source.rst | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst
index 71f23f131f97..5ee53ba76d46 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst
@@ -59,6 +59,11 @@ Image Source Control IDs
non-sensitive.
This control is required for automatic calibration of sensors/cameras.
+``V4L2_CID_BLC (integer)``
+ Changing the gain affects the black-level through the device; the gain
+ should therefore not be changed during a BLC procedure. If the gain
+ changes, the BLC routine should be re-run in some scenarios.
+
.. c:type:: v4l2_area
.. flat-table:: struct v4l2_area
--
2.17.1
