Re: [PATCH 1/2] media: i2c: ov5640: Enable data pins on startup for DVP mode

From: Sakari Ailus
Date: Fri Jul 31 2020 - 09:03:24 EST

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In reply to: Lad Prabhakar: "[PATCH 1/2] media: i2c: ov5640: Enable data pins on startup for DVP mode"
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Hi Prabhakar,

Thank you for the patch.

On Fri, Jul 31, 2020 at 10:24:46AM +0100, Lad Prabhakar wrote:
> During testing this sensor on iW-RainboW-G21D-Qseven platform noticed the
> capture worked only for first run and for subsequent runs it failed.
>
> This patch does the following in DVP mode:
> 1: Enables data lines on power up
> 2: Configures HVP lines on power up instead of configuring everytime on
> stream ON/OFF
> 3: Disables MIPI interface.
> 4: Puts the sensor in power down mode during stream OFF.

Could you detail a little the underlying problem, the environment where it
can be reproduced and how the patch addresses it, please?

Are you using CSI-2 or the parallel interface, for instance?

>
> Fixes: f22996db44e2d ("media: ov5640: add support of DVP parallel interface")
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> Reviewed-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> ---
> drivers/media/i2c/ov5640.c | 253 +++++++++++++++++++++------------------------
> 1 file changed, 120 insertions(+), 133 deletions(-)
>
> diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> index 2fe4a7a..ac305a5 100644
> --- a/drivers/media/i2c/ov5640.c
> +++ b/drivers/media/i2c/ov5640.c
> @@ -274,7 +274,7 @@ static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
> /* YUV422 UYVY VGA@30fps */
> static const struct reg_value ov5640_init_setting_30fps_VGA[] = {
> {0x3103, 0x11, 0, 0}, {0x3008, 0x82, 0, 5}, {0x3008, 0x42, 0, 0},
> - {0x3103, 0x03, 0, 0}, {0x3017, 0x00, 0, 0}, {0x3018, 0x00, 0, 0},
> + {0x3103, 0x03, 0, 0},
> {0x3630, 0x36, 0, 0},
> {0x3631, 0x0e, 0, 0}, {0x3632, 0xe2, 0, 0}, {0x3633, 0x12, 0, 0},
> {0x3621, 0xe0, 0, 0}, {0x3704, 0xa0, 0, 0}, {0x3703, 0x5a, 0, 0},
> @@ -1210,96 +1210,7 @@ static int ov5640_set_autogain(struct ov5640_dev *sensor, bool on)
>
> static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
> {
> - int ret;
> - unsigned int flags = sensor->ep.bus.parallel.flags;
> - u8 pclk_pol = 0;
> - u8 hsync_pol = 0;
> - u8 vsync_pol = 0;
> -
> - /*
> - * Note about parallel port configuration.
> - *
> - * When configured in parallel mode, the OV5640 will
> - * output 10 bits data on DVP data lines [9:0].
> - * If only 8 bits data are wanted, the 8 bits data lines
> - * of the camera interface must be physically connected
> - * on the DVP data lines [9:2].
> - *
> - * Control lines polarity can be configured through
> - * devicetree endpoint control lines properties.
> - * If no endpoint control lines properties are set,
> - * polarity will be as below:
> - * - VSYNC: active high
> - * - HREF: active low
> - * - PCLK: active low
> - */
> -
> - if (on) {
> - /*
> - * configure parallel port control lines polarity
> - *
> - * POLARITY CTRL0
> - * - [5]: PCLK polarity (0: active low, 1: active high)
> - * - [1]: HREF polarity (0: active low, 1: active high)
> - * - [0]: VSYNC polarity (mismatch here between
> - * datasheet and hardware, 0 is active high
> - * and 1 is active low...)
> - */
> - if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
> - pclk_pol = 1;
> - if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
> - hsync_pol = 1;
> - if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> - vsync_pol = 1;
> -
> - ret = ov5640_write_reg(sensor,
> - OV5640_REG_POLARITY_CTRL00,
> - (pclk_pol << 5) |
> - (hsync_pol << 1) |
> - vsync_pol);
> -
> - if (ret)
> - return ret;
> - }
> -
> - /*
> - * powerdown MIPI TX/RX PHY & disable MIPI
> - *
> - * MIPI CONTROL 00
> - * 4: PWDN PHY TX
> - * 3: PWDN PHY RX
> - * 2: MIPI enable
> - */
> - ret = ov5640_write_reg(sensor,
> - OV5640_REG_IO_MIPI_CTRL00, on ? 0x18 : 0);
> - if (ret)
> - return ret;
> -
> - /*
> - * enable VSYNC/HREF/PCLK DVP control lines
> - * & D[9:6] DVP data lines
> - *
> - * PAD OUTPUT ENABLE 01
> - * - 6: VSYNC output enable
> - * - 5: HREF output enable
> - * - 4: PCLK output enable
> - * - [3:0]: D[9:6] output enable
> - */
> - ret = ov5640_write_reg(sensor,
> - OV5640_REG_PAD_OUTPUT_ENABLE01,
> - on ? 0x7f : 0);
> - if (ret)
> - return ret;
> -
> - /*
> - * enable D[5:0] DVP data lines
> - *
> - * PAD OUTPUT ENABLE 02
> - * - [7:2]: D[5:0] output enable
> - */
> - return ov5640_write_reg(sensor,
> - OV5640_REG_PAD_OUTPUT_ENABLE02,
> - on ? 0xfc : 0);
> + return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ? 0x2 : 0x42);
> }
>
> static int ov5640_set_stream_mipi(struct ov5640_dev *sensor, bool on)
> @@ -2003,6 +1914,10 @@ static void ov5640_set_power_off(struct ov5640_dev *sensor)
>
> static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
> {
> + unsigned int flags = sensor->ep.bus.parallel.flags;
> + u8 pclk_pol = 0;
> + u8 hsync_pol = 0;
> + u8 vsync_pol = 0;
> int ret = 0;
>
> if (on) {
> @@ -2014,52 +1929,124 @@ static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
> if (ret)
> goto power_off;
>
> - /* We're done here for DVP bus, while CSI-2 needs setup. */
> - if (sensor->ep.bus_type != V4L2_MBUS_CSI2_DPHY)
> - return 0;
> + /* CSI-2 setup. */
> + if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
> + /*
> + * Power up MIPI HS Tx and LS Rx; 2 data lanes mode
> + *
> + * 0x300e = 0x40
> + * [7:5] = 010 : 2 data lanes mode (see FIXME note in
> + * "ov5640_set_stream_mipi()")
> + * [4] = 0 : Power up MIPI HS Tx
> + * [3] = 0 : Power up MIPI LS Rx
> + * [2] = 0 : MIPI interface disabled
> + */
> + ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x40);

Please wrap lines over 80 if it can be reasonably one.

> + if (ret)
> + goto power_off;
>
> - /*
> - * Power up MIPI HS Tx and LS Rx; 2 data lanes mode
> - *
> - * 0x300e = 0x40
> - * [7:5] = 010 : 2 data lanes mode (see FIXME note in
> - * "ov5640_set_stream_mipi()")
> - * [4] = 0 : Power up MIPI HS Tx
> - * [3] = 0 : Power up MIPI LS Rx
> - * [2] = 0 : MIPI interface disabled
> - */
> - ret = ov5640_write_reg(sensor,
> - OV5640_REG_IO_MIPI_CTRL00, 0x40);
> - if (ret)
> - goto power_off;
> + /*
> + * Gate clock and set LP11 in 'no packets mode' (idle)
> + *
> + * 0x4800 = 0x24
> + * [5] = 1 : Gate clock when 'no packets'
> + * [2] = 1 : MIPI bus in LP11 when 'no packets'
> + */
> + ret = ov5640_write_reg(sensor, OV5640_REG_MIPI_CTRL00, 0x24);
> + if (ret)
> + goto power_off;
>
> - /*
> - * Gate clock and set LP11 in 'no packets mode' (idle)
> - *
> - * 0x4800 = 0x24
> - * [5] = 1 : Gate clock when 'no packets'
> - * [2] = 1 : MIPI bus in LP11 when 'no packets'
> - */
> - ret = ov5640_write_reg(sensor,
> - OV5640_REG_MIPI_CTRL00, 0x24);
> - if (ret)
> - goto power_off;
> + /*
> + * Set data lanes and clock in LP11 when 'sleeping'
> + *
> + * 0x3019 = 0x70
> + * [6] = 1 : MIPI data lane 2 in LP11 when 'sleeping'
> + * [5] = 1 : MIPI data lane 1 in LP11 when 'sleeping'
> + * [4] = 1 : MIPI clock lane in LP11 when 'sleeping'
> + */
> + ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT00, 0x70);
> + if (ret)
> + goto power_off;
>
> - /*
> - * Set data lanes and clock in LP11 when 'sleeping'
> - *
> - * 0x3019 = 0x70
> - * [6] = 1 : MIPI data lane 2 in LP11 when 'sleeping'
> - * [5] = 1 : MIPI data lane 1 in LP11 when 'sleeping'
> - * [4] = 1 : MIPI clock lane in LP11 when 'sleeping'
> - */
> - ret = ov5640_write_reg(sensor,
> - OV5640_REG_PAD_OUTPUT00, 0x70);
> - if (ret)
> - goto power_off;
> + /* Give lanes some time to coax into LP11 state. */
> + usleep_range(500, 1000);
> + } else {
> + /*
> + * Note about parallel port configuration.
> + *
> + * When configured in parallel mode, the OV5640 will
> + * output 10 bits data on DVP data lines [9:0].
> + * If only 8 bits data are wanted, the 8 bits data lines
> + * of the camera interface must be physically connected
> + * on the DVP data lines [9:2].
> + *
> + * Control lines polarity can be configured through
> + * devicetree endpoint control lines properties.
> + * If no endpoint control lines properties are set,
> + * polarity will be as below:
> + * - VSYNC: active high
> + * - HREF: active low
> + * - PCLK: active low
> + */
> + /*
> + * configure parallel port control lines polarity
> + *
> + * POLARITY CTRL0
> + * - [5]: PCLK polarity (0: active low, 1: active high)
> + * - [1]: HREF polarity (0: active low, 1: active high)
> + * - [0]: VSYNC polarity (mismatch here between
> + * datasheet and hardware, 0 is active high
> + * and 1 is active low...)
> + */
> + if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
> + pclk_pol = 1;
> + if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
> + hsync_pol = 1;
> + if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> + vsync_pol = 1;
> +
> + ret = ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00,
> + (pclk_pol << 5) | (hsync_pol << 1) | vsync_pol);
> +
> + if (ret)
> + goto power_off;
> +
> + /*
> + * powerdown MIPI TX/RX PHY & disable MIPI
> + *
> + * MIPI CONTROL 00
> + * 4: PWDN PHY TX
> + * 3: PWDN PHY RX
> + * 2: MIPI enable
> + */
> + ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x18);
> + if (ret)
> + goto power_off;
> +
> + /*
> + * enable VSYNC/HREF/PCLK DVP control lines
> + * & D[9:6] DVP data lines
> + *
> + * PAD OUTPUT ENABLE 01
> + * - 6: VSYNC output enable
> + * - 5: HREF output enable
> + * - 4: PCLK output enable
> + * - [3:0]: D[9:6] output enable
> + */
> + ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01, 0x7f);
> + if (ret)
> + goto power_off;
>
> - /* Give lanes some time to coax into LP11 state. */
> - usleep_range(500, 1000);
> + /*
> + * enable D[5:0] DVP data lines
> + *
> + * PAD OUTPUT ENABLE 02
> + * - [7:2]: D[5:0] output enable
> + */
> + ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE02, 0xfc);
> + if (ret)
> + goto power_off;
> + }
>
> } else {
> if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY) {

--
Kind regards,

Sakari Ailus

Next message: Gustavo A. R. Silva: "[PATCH][next] vhost: Use flex_array_size() helper in copy_from_user()"
Previous message: Serge Semin: "Re: [PATCH 0/8] spi: dw-dma: Add max SG entries burst capability support"
In reply to: Lad Prabhakar: "[PATCH 1/2] media: i2c: ov5640: Enable data pins on startup for DVP mode"
Next in thread: Lad, Prabhakar: "Re: [PATCH 1/2] media: i2c: ov5640: Enable data pins on startup for DVP mode"
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