media: i2c: imx258: Allow configuration of clock lane behaviour

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>

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index bc33d48..8b0c5f2 100644 (file)
--- 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
@@ -829,6 +831,7 @@ 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:
@@ -1260,6 +1263,15 @@ 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 ?
+                              1 : 0);
+       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);
@@ -1674,6 +1686,8 @@ static int imx258_probe(struct i2c_client *client)
                goto error_endpoint_poweron;
        }
 
+       imx258->csi2_flags = ep.bus.mipi_csi2.flags;
+
        /* Initialize subdev */
        v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);