[PATCH v4 3/3] media: imx: ask source subdevice for number of active data lanes

[Philipp Zabel <p.zabel@pengutronix.de>]

Use the newly added g_csi_active_lanes() video op to determine the
number of active data lanes used by the transmitter. If this subdev
call is not supported or does not return the number of active lanes,
default to using all connected data lanes as before.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
Changes since v3:
 - Use g_csi_active_lanes instead of g_mbus_config.
---
 drivers/staging/media/imx/imx6-mipi-csi2.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index bfa4b254c4e4..aa4bf2f89695 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -131,10 +131,8 @@ static void csi2_enable(struct csi2_dev *csi2, bool enable)
 	}
 }
 
-static void csi2_set_lanes(struct csi2_dev *csi2)
+static void csi2_set_lanes(struct csi2_dev *csi2, int lanes)
 {
-	int lanes = csi2->bus.num_data_lanes;
-
 	writel(lanes - 1, csi2->base + CSI2_N_LANES);
 }
 
@@ -295,6 +293,7 @@ static void csi2ipu_gasket_init(struct csi2_dev *csi2)
 
 static int csi2_start(struct csi2_dev *csi2)
 {
+	u32 lanes = 0;
 	int ret;
 
 	ret = clk_prepare_enable(csi2->pix_clk);
@@ -310,7 +309,8 @@ static int csi2_start(struct csi2_dev *csi2)
 		goto err_disable_clk;
 
 	/* Step 4 */
-	csi2_set_lanes(csi2);
+	v4l2_subdev_call(csi2->src_sd, video, g_csi_active_lanes, &lanes);
+	csi2_set_lanes(csi2, lanes ?: csi2->bus.num_data_lanes);
 	csi2_enable(csi2, true);
 
 	/* Step 5 */
-- 
2.20.1