Introduce a new pad operation to allow retrieving the media bus
configuration on a subdevice pad.
The newly introduced operation reassembles the s/g_mbus_config video
operation, which have been on their way to be deprecated since a long
time.
Currently only support MIPI CSI-2 mbus configuration.
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
include/media/v4l2-mediabus.h | 2 +-
include/media/v4l2-subdev.h | 31 +++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
index 45f88f0248c4..438c7337248f 100644
--- a/include/media/v4l2-mediabus.h
+++ b/include/media/v4l2-mediabus.h
@@ -22,7 +22,7 @@
#define V4L2_MBUS_SLAVE BIT(1)
/*
* Signal polarity flags
- * Note: in BT.656 mode HSYNC, FIELD, and VSYNC are unused
+ * Note: in BT.656 mode HSYNC, FIELD, DATA_ACTIVE and VSYNC are unused
* V4L2_MBUS_[HV]SYNC* flags should be also used for specifying
* configuration of hardware that uses [HV]REF signals
*/
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index a4848de59852..654b29f8c01e 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -670,6 +670,33 @@ struct v4l2_subdev_pad_config {
*
* @set_frame_desc: set the low level media bus frame parameters, @fd array
* may be adjusted by the subdev driver to device capabilities.
+ *
+ * @get_mbus_config: get the current media bus configuration. This operation is
+ * intended to be used to synchronize the media bus
+ * configuration parameters between receivers and
+ * transmitters. The static bus configuration is usually
+ * received from the firmware interface, and updated
+ * dynamically using this operation to retrieve bus
+ * configuration parameters which could change at run-time.
+ * Callers should make sure they get the most up-to-date as
+ * possible configuration from the connected sub-device,
+ * likely calling this operation as close as possible to
+ * stream on time. The operation is allowed to fail if the
+ * the pad index it has been called on is unsupported.
+ *
+ * @set_mbus_config: set the media bus configuration. This operations is
+ * intended to allow, in combination with the
+ * get_mbus_format operation, the negotiation of media bus
+ * configuration parameters between media subdevices.
+ * The initial media bus configuration is retrieved from
+ * the firmware interface and later updated through this
+ * operation if the sub-device allows changing it.
+ * The operation shall not fail if the requested configuration
+ * is not supported, but the driver shall update the received
+ * %config argument to reflect what has been actually applied
+ * to its media bus configuration. The operation is allowed
+ * to fail if the pad index it has been called on is
+ * unsupported.
*/
struct v4l2_subdev_pad_ops {
int (*init_cfg)(struct v4l2_subdev *sd,
@@ -710,6 +737,10 @@ struct v4l2_subdev_pad_ops {
struct v4l2_mbus_frame_desc *fd);
int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_frame_desc *fd);
+ int (*get_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
+ struct v4l2_mbus_config *config);
+ int (*set_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
+ struct v4l2_mbus_config *config);
};
/**
--
2.26.2
