greybus: camera: Add CSI configuration parameters

Add CSI configuration parameters to the configure_stream operation
response.
Currently, only the total number of lines in a second is used to configure the
the AP-Bridge CSI transmitter, all other parameters (number of CSI data
lanes, and CSI bus clock frequency) are kept hard-coded for two reasons:
1) We need to configure the CSI receiver on AP side accordingly to these
settings, before sending them to APB1 CSI transmitter.
2) We cannot use the camera module provided parameters as-is, but use
those information to compute the required bandwidth on the CSI bus, and
configure the # of CSI data lanes, and the CSI bus clock speed in a way that
satisfies that bandwidth requirement.

Signed-off-by: Jacopo Mondi <jacopo.mondi@linaro.org>
Acked-by: Laurent Pinchart <laurent.pinchart@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h
index 6b192924a566..1a90dc2d9c3a 100644
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -1276,7 +1276,10 @@ struct gb_camera_configure_streams_response {
 	__u8 num_streams;
 	__u8 flags;
 #define GB_CAMERA_CONFIGURE_STREAMS_ADJUSTED	0x01
-	__le16 padding;
+	__u8 num_lanes;
+	__u8 padding;
+	__le32 bus_freq;
+	__le32 lines_per_second;
 	struct gb_camera_stream_config_response config[0];
 } __packed;