[PATCH v4 12/25] media: i2c: imx258: Allow configuration of clock lane behaviour

git
2024-04-14T20:41:46Z

The sensor supports the clock lane either remaining in HS mode
during frame blanking, or dropping to LP11.

Add configuration of the mode via V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Luis Garcia <git@luigi311.com>
---
drivers/media/i2c/imx258.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index 59a78a4cfe44..2429eb7b55c6 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -72,6 +72,8 @@
/* Test Pattern Control */
#define IMX258_REG_TEST_PATTERN 0x0600

+#define IMX258_CLK_BLANK_STOP 0x4040
+
/* Orientation */
#define REG_MIRROR_FLIP_CONTROL 0x0101
#define REG_CONFIG_MIRROR_FLIP 0x03
@@ -632,6 +634,7 @@ struct imx258 {
const struct imx258_link_freq_config *link_freq_configs;
const s64 *link_freq_menu_items;
unsigned int nlanes;
+ unsigned int csi2_flags;

/*
* Mutex for serialized access:
@@ -1066,6 +1069,14 @@ static int imx258_start_streaming(struct imx258 *imx258)
return ret;
}

+ ret = imx258_write_reg(imx258, IMX258_CLK_BLANK_STOP,
+ IMX258_REG_VALUE_08BIT,
+ !!(imx258->csi2_flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK));
+ if (ret) {
+ dev_err(&client->dev, "%s failed to set clock lane mode\n", __func__);
+ return ret;
+ }
+
/* Apply default values of current mode */
reg_list = &imx258->cur_mode->reg_list;
ret = imx258_write_regs(imx258, reg_list->regs, reg_list->num_of_regs);
@@ -1438,6 +1449,8 @@ static int imx258_probe(struct i2c_client *client)
goto error_endpoint_free;
}

+ imx258->csi2_flags = ep.bus.mipi_csi2.flags;
+
/* Initialize subdev */
v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);

--
2.44.0