Custom imx6Solo board + ov5640 mipi issues

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Custom imx6Solo board + ov5640 mipi issues

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Contributor I

Hello,

we have been struggling with a custom board using i.MX 6Solo and ov5640 mipi camera.

So far the board works except for the camera interface.

The ov5640 is plugged via MIPI using the following configuration:

- i2c2 interface for SDA / CLK:

static iomux_v3_cfg_t mx6dl_customboard_i2c2_pads[] = {

  MX6DL_PAD_KEY_COL3__I2C2_SCL, /* I2C2 SCL */

  MX6DL_PAD_KEY_ROW3__I2C2_SDA, /* I2C2 SDA */

};

The ov5640 is plugged using the following pins:

Camera RST --> SD1_CLK

Camera PWN --> SD1_CMD

PIXCLK --> CSI0_PIXCLK

CSI_D1P

CSI_D1M

CSI_CLK0P

CSI_CLK0M

CSI_D0P

CSI_D0M

static iomux_v3_cfg_t mx6dl_customboard_mipi_sensor_pads[] = {

    MX6DL_PAD_GPIO_0__CCM_CLKO,

    MX6DL_PAD_SD1_CMD__GPIO_1_18,  /* camera PWDN */

    MX6DL_PAD_SD1_CLK__GPIO_1_20,  /* camera RESET */

};

At board's file configuration we declare the i2c / camera interface as:

#define MIPICSI_PWN IMX_GPIO_NR(1, 18)

#define MIPICSI_RST IMX_GPIO_NR(1, 20)

[...]

static struct fsl_mxc_camera_platform_data ov5640_mipi_data = {

    .mclk = 22000000,

    .csi = 0,

    .io_init = mx6q_mipi_sensor_io_init,

    .pwdn = mx6q_mipi_powerdown,

};

[...]

static struct i2c_board_info mxc_i2c2_board_info[] __initdata = {

  {

        I2C_BOARD_INFO("ov5640_mipi", 0x3c),

        .platform_data = (void *)&ov5640_mipi_data,

  },

};

[...]

struct pwm_device *mipi_pwm;

static void mx6q_mipi_powerdown(int powerdown)

{

    if (!IS_ERR(mipi_pwm)) {

        if (powerdown) {

            pwm_disable(mipi_pwm);

        } else {

            unsigned period = 1000/24;

            pwm_config(mipi_pwm, period >> 1, period);

            pwm_enable(mipi_pwm);

        }

    }

    pr_info("%s: powerdown=%d, power_gp=0x%x\n", __func__, powerdown, MIPICSI_PWN);

    gpio_set_value(MIPICSI_PWN, powerdown ? 1 : 0);

    if (!powerdown)

        msleep(2);

}

static void camera_reset(int power_gp, int reset_gp, int reset_gp2)

{

    pr_info("%s: power_gp=0x%x, reset_gp=0x%x reset_gp2=0x%x\n",

            __func__, power_gp, reset_gp, reset_gp2);

    /* Camera power down */

    gpio_request(power_gp, "cam-pwdn");

    gpio_request(reset_gp, "cam-reset");

    if (reset_gp2 >= 0)

        gpio_request(reset_gp2, "cam-reset2");

    gpio_direction_output(power_gp, 1);

    /* Camera reset */

    gpio_direction_output(reset_gp, 0);

    if (reset_gp2 >= 0)

        gpio_direction_output(reset_gp2, 0);

    msleep(1);

    gpio_set_value(power_gp, 0);

    msleep(1);

    gpio_set_value(reset_gp, 1);

    if (reset_gp2 >= 0)

        gpio_set_value(reset_gp2, 1);

}

static void mx6q_mipi_sensor_io_init(void)

{

    mxc_iomux_v3_setup_multiple_pads(mx6dl_customboard_mipi_sensor_pads,

                                     ARRAY_SIZE(mx6dl_customboard_mipi_sensor_pads));

    mipi_pwm = pwm_request(3, "mipi_clock");

    if (IS_ERR(mipi_pwm)) {

        pr_err("unable to request PWM for mipi_clock\n");

    } else {

        unsigned period = 1000/22;

        pr_info("got pwm for mipi_clock\n");

        pwm_config(mipi_pwm, period >> 1, period);

        pwm_enable(mipi_pwm);

    }

    camera_reset(MIPICSI_PWN,MIPICSI_RST, NULL);

    mxc_iomux_set_gpr_register(13, 0, 3, 1);

}

[...]

However, we constantly get the following error:

i2c-core: driver [ov5640] registered

ov5640_mipi 2-003c: probe

got pwm for mipi_clock

pwm_config: pwm freq = 2250000, clk_select=2 clock_rate=4500000

camera_reset: power_gp=0x12, reset_gp=0x14 reset_gp2=0x0

pwm_config: pwm freq = 2250000, clk_select=2 clock_rate=4500000

mx6q_mipi_powerdown: powerdown=0, power_gp=0x12

i2c i2c-2: master_xfer[0] W, addr=0x3c, len=2

i2c i2c-2: <i2c_imx_xfer>

i2c i2c-2: <i2c_imx_start>

i2c i2c-2: <i2c_imx_bus_busy>

i2c i2c-2: <i2c_imx_bus_busy> I2C bus is busy

i2c i2c-2: <i2c_imx_stop>

i2c i2c-2: <i2c_imx_bus_busy>

i2c i2c-2: <i2c_imx_xfer> exit with: error: -110

ov5640_read_reg:write reg error:reg=300a

ov5640_probe:cannot find camera

Note we are tried to use boundarydevice's patch for pwm[1], but

apparently it is not a clock issue either. The kernel's version used is imx_3.0.35_3.0.0

Can anyone point out if the pins are the correct ones?

Thanks.

1 - https://github.com/boundarydevices/linux-imx6/commit/82c720893fc5459ee948fdbfd33ba9be2fc4894e

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3 Replies

78 Views
NXP Employee
NXP Employee

Hello,

Just spent 3 hours on a SabreSD I knew was working, both cameras (ov5642 and mipi) not recognised with same error after loading camera module :

root@freescale ~$ modprobe ov5640_camera_mipi

ov5640_read_reg:write reg error:reg=300a

camera ov5640_mipi is not found

To discover I plugged the cameras the wrong way (sensors should be on the edge of screen, at least it is not destructive), no i2c signal means no communication to initialize cameras !

After that, modprobe mxc_v4l2_capture and you should have your /dev/video0 and / or 1 appearing.

My 2 cents, Philippe.

78 Views
Contributor III

Hello,

I wonder if you have figured out the issue.  I am trying to connect a ov5640 MIPI camera to iMX6 solo (wandboard).  I face the same issue, not able to detect the camera. 

Any suggestion to debug will b helful.

Thanks!

0 Kudos

78 Views
NXP Employee
NXP Employee

I think first step is make sure you're getting the right clock to camera. Do you have an scope?

Next step would take some i2c debug tool (just like i2c-tools) and found your camera in some i2c bus.