linux-kernel - Re: [PATCH v2 7/8] media: i2c: ds90ub953: Support non-sync mode

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Date:   Tue, 25 Jul 2023 19:44:12 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Satish Nagireddy <satish.nagireddy@...cruise.com>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/8] media: i2c: ds90ub953: Support non-sync mode

Hi Tomi,

Thank you for the patch.

On Thu, Jul 20, 2023 at 01:30:38PM +0300, Tomi Valkeinen wrote:
> Add support for FPD-Link non-sync mode with external clock. The only
> thing that needs to be added is the calculation for the clkout.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
>  drivers/media/i2c/ds90ub953.c | 34 ++++++++++++++++++++++++++--------
>  1 file changed, 26 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c
> index 3a19c6dedd2f..846542e6e20d 100644
> --- a/drivers/media/i2c/ds90ub953.c
> +++ b/drivers/media/i2c/ds90ub953.c
> @@ -143,6 +143,7 @@ struct ub953_data {
>  
>  	struct i2c_client	*client;
>  	struct regmap		*regmap;
> +	struct clk		*clkin;
>  
>  	u32			num_data_lanes;
>  	bool			non_cont_clk;
> @@ -842,15 +843,21 @@ static int ub953_i2c_master_init(struct ub953_data *priv)
>  
>  static u64 ub953_get_fc_rate(struct ub953_data *priv)
>  {
> -	if (priv->mode != UB953_MODE_SYNC) {
> +	switch (priv->mode) {
> +	case UB953_MODE_SYNC:
> +		if (priv->hw_data->is_ub971)
> +			return priv->plat_data->bc_rate * 160ull;
> +		else
> +			return priv->plat_data->bc_rate / 2 * 160ull;
> +
> +	case UB953_MODE_NONSYNC_EXT:
> +		/* CLKIN_DIV = 1 always */
> +		return clk_get_rate(priv->clkin) * 80ull;
> +
> +	default:
>  		/* Not supported */
>  		return 0;
>  	}
> -
> -	if (priv->hw_data->is_ub971)
> -		return priv->plat_data->bc_rate * 160ull;
> -	else
> -		return priv->plat_data->bc_rate / 2 * 160ull;
>  }
>  
>  static unsigned long ub953_calc_clkout_ub953(struct ub953_data *priv,
> @@ -1188,9 +1195,15 @@ static int ub953_hw_init(struct ub953_data *priv)
>  	dev_dbg(dev, "mode from %s: %#x\n", mode_override ? "reg" : "strap",
>  		priv->mode);
>  
> -	if (priv->mode != UB953_MODE_SYNC)
> +	if (priv->mode != UB953_MODE_SYNC &&
> +	    priv->mode != UB953_MODE_NONSYNC_EXT)
>  		return dev_err_probe(dev, -ENODEV,
> -				     "Only synchronous mode supported\n");
> +				     "Unsupported mode selected: %d\n",

%u

> +				     priv->mode);
> +
> +	if (priv->mode == UB953_MODE_NONSYNC_EXT && !priv->clkin)
> +		return dev_err_probe(dev, -EINVAL,
> +				     "clkin required for non-sync ext mode\n");
>  
>  	ret = ub953_read(priv, UB953_REG_REV_MASK_ID, &v);
>  	if (ret)
> @@ -1318,6 +1331,11 @@ static int ub953_probe(struct i2c_client *client)
>  		goto err_mutex_destroy;
>  	}
>  
> +	priv->clkin = devm_clk_get_optional(dev, "clkin");
> +	if (IS_ERR(priv->clkin))
> +		return dev_err_probe(dev, PTR_ERR(priv->clkin),
> +				     "failed to parse 'clkin'\n");

You need to goto err_mutex_destroy.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> +
>  	ret = ub953_parse_dt(priv);
>  	if (ret)
>  		goto err_mutex_destroy;
> 

-- 
Regards,

Laurent Pinchart