[PATCH/RFC v2 09/15] adv748x: csi2: add module param for virtual channel

["Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>]

The hardware can output on any of the 4 (0-3) Virtual Channels of the
CSI-2 bus. Add a module parameter each for TXA and TXB to allow the user
to specify which channel should be used.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/media/i2c/adv748x/adv748x-core.c | 10 ++++++++++
 drivers/media/i2c/adv748x/adv748x-csi2.c |  2 +-
 drivers/media/i2c/adv748x/adv748x.h      |  1 +
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
index fd92c9e4b519d2c5..3cad52532ead2e34 100644
--- a/drivers/media/i2c/adv748x/adv748x-core.c
+++ b/drivers/media/i2c/adv748x/adv748x-core.c
@@ -31,6 +31,9 @@
 
 #include "adv748x.h"
 
+static unsigned int txavc;
+static unsigned int txbvc;
+
 /* -----------------------------------------------------------------------------
  * Register manipulation
  */
@@ -747,6 +750,7 @@ static int adv748x_probe(struct i2c_client *client,
 	}
 
 	/* Initialise TXA */
+	state->txa.vc = txavc;
 	ret = adv748x_csi2_init(state, &state->txa);
 	if (ret) {
 		adv_err(state, "Failed to probe TXA");
@@ -754,6 +758,7 @@ static int adv748x_probe(struct i2c_client *client,
 	}
 
 	/* Initialise TXB */
+	state->txb.vc = txbvc;
 	ret = adv748x_csi2_init(state, &state->txb);
 	if (ret) {
 		adv_err(state, "Failed to probe TXB");
@@ -824,6 +829,11 @@ static struct i2c_driver adv748x_driver = {
 
 module_i2c_driver(adv748x_driver);
 
+module_param(txavc, uint, 0644);
+MODULE_PARM_DESC(txavc, "Virtual Channel for TXA");
+module_param(txbvc, uint, 0644);
+MODULE_PARM_DESC(txbvc, "Virtual Channel for TXB");
+
 MODULE_AUTHOR("Kieran Bingham <kieran.bingham@ideasonboard.com>");
 MODULE_DESCRIPTION("ADV748X video decoder");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/media/i2c/adv748x/adv748x-csi2.c b/drivers/media/i2c/adv748x/adv748x-csi2.c
index 820b44ed56a8679f..2a5dff8c571013bf 100644
--- a/drivers/media/i2c/adv748x/adv748x-csi2.c
+++ b/drivers/media/i2c/adv748x/adv748x-csi2.c
@@ -281,7 +281,7 @@ int adv748x_csi2_init(struct adv748x_state *state, struct adv748x_csi2 *tx)
 	}
 
 	/* Initialise the virtual channel */
-	adv748x_csi2_set_virtual_channel(tx, 0);
+	adv748x_csi2_set_virtual_channel(tx, tx->vc);
 
 	adv748x_subdev_init(&tx->sd, state, &adv748x_csi2_ops,
 			    MEDIA_ENT_F_UNKNOWN,
diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
index 6789e2f3bc8c2b49..f6e40ee3924e8f12 100644
--- a/drivers/media/i2c/adv748x/adv748x.h
+++ b/drivers/media/i2c/adv748x/adv748x.h
@@ -92,6 +92,7 @@ enum adv748x_csi2_pads {
 
 struct adv748x_csi2 {
 	struct adv748x_state *state;
+	unsigned int vc;
 	struct v4l2_mbus_framefmt format;
 	unsigned int page;
 
-- 
2.15.1