@@ -173,3 +173,19 @@ V4L2_CID_VFLIP controls with the values programmed by the register sequences.
The default values of these controls shall be 0 (disabled). Especially these
controls shall not be inverted, independently of the sensor's mounting
rotation.
+
+Flip handling for raw camera color sensors
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Applying vertical and horizontal flips on raw camera sensors inverts the color
+sample reading direction on the sensor's pixel array. This may cause the
+re-ordering of the color samples on the sensor's output frame. As an example, a
+raw camera sensor with a Bayer pattern color filter array with a native RGGB
+Bayer order will produce frames with GRBG component ordering when an horizontal
+flip is applied. Camera sensor drivers where inverting the reading order
+direction causes a re-ordering of the color components are requested to register
+the ``V4L2_CID_VFLIP`` and ``V4L2_CID_HFLIP`` controls with the
+``V4L2_CTRL_FLAG_MODIFY_LAYOUT`` flag enabled to notify userspace that enabling
+a flip can potentially change the output buffer content layout. Flips should
+also be taken into account when enumerating and handling media bus formats
+on the camera sensor source pads.
Document the requirement of notifying to userspace the possible re-ordering of the color sample components when a vertical or horizontal flip is applied to a RAW camera sensor. Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com> --- Documentation/driver-api/media/camera-sensor.rst | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)