linux-kernel - Re: [PATCH v4 3/8] media: adv7180: add support for NEWAVMODE

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Date:   Sun, 16 Oct 2016 15:18:45 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     lars@...afoo.de, mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v4 3/8] media: adv7180: add support for NEWAVMODE

Hi Steve,

Thank you for the patch.

On Wednesday 03 Aug 2016 11:03:45 Steve Longerbeam wrote:
> Parse the optional v4l2 endpoint DT node. If the bus type is
> V4L2_MBUS_BT656 and the endpoint node specifies "newavmode",
> configure the BT.656 bus in NEWAVMODE.
> 
> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
> 
> ---
> 
> v4: no changes
> v3:
> - the newavmode endpoint property is now private to adv7180.
> ---
>  .../devicetree/bindings/media/i2c/adv7180.txt      |  4 ++
>  drivers/media/i2c/adv7180.c                        | 46 +++++++++++++++++--
>  2 files changed, 47 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/adv7180.txt
> b/Documentation/devicetree/bindings/media/i2c/adv7180.txt index
> 0d50115..6c175d2 100644
> --- a/Documentation/devicetree/bindings/media/i2c/adv7180.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/adv7180.txt
> @@ -15,6 +15,10 @@ Required Properties :
>  		"adi,adv7282"
>  		"adi,adv7282-m"
> 
> +Optional Endpoint Properties :
> +- newavmode: a boolean property to indicate the BT.656 bus is operating
> +  in Analog Device's NEWAVMODE. Valid for BT.656 busses only.

This is a vendor-specific property, it should be prefixed with "adi,". Could 
you also explain how this mode works ? I'd like to make sure it qualifies for 
a DT property.

> +
>  Example:
> 
>  	i2c0@...2000 {
> diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
> index 6e093c22..467953e 100644
> --- a/drivers/media/i2c/adv7180.c
> +++ b/drivers/media/i2c/adv7180.c
> @@ -31,6 +31,7 @@
>  #include <media/v4l2-event.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-ctrls.h>
> +#include <media/v4l2-of.h>
>  #include <linux/mutex.h>
>  #include <linux/delay.h>
> 
> @@ -106,6 +107,7 @@
>  #define ADV7180_REG_SHAP_FILTER_CTL_1	0x0017
>  #define ADV7180_REG_CTRL_2		0x001d
>  #define ADV7180_REG_VSYNC_FIELD_CTL_1	0x0031
> +#define ADV7180_VSYNC_FIELD_CTL_1_NEWAVMODE 0x02
>  #define ADV7180_REG_MANUAL_WIN_CTL_1	0x003d
>  #define ADV7180_REG_MANUAL_WIN_CTL_2	0x003e
>  #define ADV7180_REG_MANUAL_WIN_CTL_3	0x003f
> @@ -214,6 +216,7 @@ struct adv7180_state {
>  	struct mutex		mutex; /* mutual excl. when accessing chip */
>  	int			irq;
>  	v4l2_std_id		curr_norm;
> +	bool			newavmode;
>  	bool			powered;
>  	bool			streaming;
>  	u8			input;
> @@ -864,9 +867,15 @@ static int adv7180_init(struct adv7180_state *state)
>  	if (ret < 0)
>  		return ret;
> 
> -	/* Manually set V bit end position in NTSC mode */
> -	return adv7180_write(state, ADV7180_REG_NTSC_V_BIT_END,
> -					ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
> +	if (!state->newavmode) {
> +		/* Manually set V bit end position in NTSC mode */
> +		ret = adv7180_write(state, ADV7180_REG_NTSC_V_BIT_END,
> +				    ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
>  }
> 
>  static int adv7180_set_std(struct adv7180_state *state, unsigned int std)
> @@ -1217,6 +1226,13 @@ static int init_device(struct adv7180_state *state)
>  	if (ret)
>  		goto out_unlock;
> 
> +	if (state->newavmode) {
> +		ret = adv7180_write(state, ADV7180_REG_VSYNC_FIELD_CTL_1,
> +				    ADV7180_VSYNC_FIELD_CTL_1_NEWAVMODE);
> +		if (ret < 0)
> +			goto out_unlock;
> +	}
> +
>  	ret = adv7180_program_std(state);
>  	if (ret)
>  		goto out_unlock;
> @@ -1257,6 +1273,28 @@ out_unlock:
>  	return ret;
>  }
> 
> +static void adv7180_of_parse(struct adv7180_state *state)
> +{
> +	struct i2c_client *client = state->client;
> +	struct device_node *np = client->dev.of_node;
> +	struct device_node *endpoint;
> +	struct v4l2_of_endpoint	ep;
> +
> +	endpoint = of_graph_get_next_endpoint(np, NULL);
> +	if (!endpoint) {
> +		v4l_warn(client, "endpoint node not found\n");
> +		return;
> +	}
> +
> +	v4l2_of_parse_endpoint(endpoint, &ep);
> +	if (ep.bus_type == V4L2_MBUS_BT656) {
> +		if (of_property_read_bool(endpoint, "newavmode"))
> +			state->newavmode = true;
> +	}
> +
> +	of_node_put(endpoint);
> +}
> +
>  static int adv7180_probe(struct i2c_client *client,
>  			 const struct i2c_device_id *id)
>  {
> @@ -1279,6 +1317,8 @@ static int adv7180_probe(struct i2c_client *client,
>  	state->field = V4L2_FIELD_ALTERNATE;
>  	state->chip_info = (struct adv7180_chip_info *)id->driver_data;
> 
> +	adv7180_of_parse(state);
> +
>  	if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) {
>  		state->csi_client = i2c_new_dummy(client->adapter,
>  				ADV7180_DEFAULT_CSI_I2C_ADDR);

-- 
Regards,

Laurent Pinchart