The CSI Tx can't be stopped except by pulling the CTx reset.
Split the actual CSI start out of set_csi. This allows to call
it later in s_stream, as the Synopsys Designware MIPI CSI-2 Host
Controller needs to start with the lanes in stop state before
it can sync its PLL to the clock lane.
Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
drivers/media/i2c/tc358743.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index 74e83c5..34acfed 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -759,6 +759,14 @@ static void tc358743_set_csi(struct v4l2_subdev *sd)
((lanes > 3) ? MASK_D3M_HSTXVREGEN : 0x0));
i2c_wr32(sd, TXOPTIONCNTRL, MASK_CONTCLKMODE);
+}
+
+static void tc358743_start_csi(struct v4l2_subdev *sd)
+{
+ unsigned lanes = tc358743_num_csi_lanes_needed(sd);
+
+ v4l2_dbg(3, debug, sd, "%s:\n", __func__);
+
i2c_wr32(sd, STARTCNTRL, MASK_START);
i2c_wr32(sd, CSI_START, MASK_STRT);
@@ -1177,6 +1185,7 @@ static long tc358743_ioctl(struct v4l2_subdev *sd,
unsigned int cmd, void *arg)
i2c_wr16(sd, CONFCTL, confctl &
(~(MASK_VBUFEN | MASK_ABUFEN)));
tc358743_set_csi(sd);
+ tc358743_start_csi(sd);
i2c_wr16(sd, CONFCTL, confctl |
(MASK_VBUFEN | MASK_ABUFEN));
return 0;
@@ -1505,7 +1514,11 @@ static int tc358743_g_mbus_config(struct v4l2_subdev *sd,
static int tc358743_s_stream(struct v4l2_subdev *sd, int enable)
{
+ if (enable)
+ tc358743_start_csi(sd);
enable_stream(sd, enable);
+ if (!enable)
+ tc358743_set_csi(sd);
return 0;
}
--
2.1.4
--
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