linux-kernel - Re: [PATCH v3 05/15] media: rcar-csi2: Move rcar2_calc

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Message-ID: <20250602140334.GF11750@pendragon.ideasonboard.com>
Date: Mon, 2 Jun 2025 17:03:34 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Cc: Niklas Söderlund <niklas.soderlund@...natech.se>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Niklas Söderlund <niklas.soderlund+renesas@...natech.se>,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Jacopo Mondi <jacopo.mondi@...asonboard.com>
Subject: Re: [PATCH v3 05/15] media: rcar-csi2: Move rcar2_calc_mbps()

Hi Tomi,

Thank you for the patch.

On Fri, May 30, 2025 at 04:50:34PM +0300, Tomi Valkeinen wrote:
> Move the function so that it can call rcsi2_get_active_lanes() in the
> following patch.

I would add "No functional change intended." or something similar.

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

> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> ---
>  drivers/media/platform/renesas/rcar-csi2.c | 66 +++++++++++++++---------------
>  1 file changed, 33 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
> index 698eb0e60f32..8aca35096408 100644
> --- a/drivers/media/platform/renesas/rcar-csi2.c
> +++ b/drivers/media/platform/renesas/rcar-csi2.c
> @@ -951,39 +951,6 @@ static int rcsi2_set_phypll(struct rcar_csi2 *priv, unsigned int mbps)
>  	return 0;
>  }
>  
> -static int rcsi2_calc_mbps(struct rcar_csi2 *priv, unsigned int bpp,
> -			   unsigned int lanes)
> -{
> -	struct media_pad *remote_pad;
> -	struct v4l2_subdev *source;
> -	s64 freq;
> -	u64 mbps;
> -
> -	if (!priv->remote)
> -		return -ENODEV;
> -
> -	source = priv->remote;
> -	remote_pad = &source->entity.pads[priv->remote_pad];
> -
> -	freq = v4l2_get_link_freq(remote_pad, bpp, 2 * lanes);
> -	if (freq < 0) {
> -		int ret = (int)freq;
> -
> -		dev_err(priv->dev, "failed to get link freq for %s: %d\n",
> -			source->name, ret);
> -
> -		return ret;
> -	}
> -
> -	mbps = div_u64(freq * 2, MEGA);
> -
> -	/* Adjust for C-PHY, divide by 2.8. */
> -	if (priv->cphy)
> -		mbps = div_u64(mbps * 5, 14);
> -
> -	return mbps;
> -}
> -
>  static int rcsi2_get_active_lanes(struct rcar_csi2 *priv,
>  				  unsigned int *lanes)
>  {
> @@ -1031,6 +998,39 @@ static int rcsi2_get_active_lanes(struct rcar_csi2 *priv,
>  	return 0;
>  }
>  
> +static int rcsi2_calc_mbps(struct rcar_csi2 *priv, unsigned int bpp,
> +			   unsigned int lanes)
> +{
> +	struct media_pad *remote_pad;
> +	struct v4l2_subdev *source;
> +	s64 freq;
> +	u64 mbps;
> +
> +	if (!priv->remote)
> +		return -ENODEV;
> +
> +	source = priv->remote;
> +	remote_pad = &source->entity.pads[priv->remote_pad];
> +
> +	freq = v4l2_get_link_freq(remote_pad, bpp, 2 * lanes);
> +	if (freq < 0) {
> +		int ret = (int)freq;
> +
> +		dev_err(priv->dev, "failed to get link freq for %s: %d\n",
> +			source->name, ret);
> +
> +		return ret;
> +	}
> +
> +	mbps = div_u64(freq * 2, MEGA);
> +
> +	/* Adjust for C-PHY, divide by 2.8. */
> +	if (priv->cphy)
> +		mbps = div_u64(mbps * 5, 14);
> +
> +	return mbps;
> +}
> +
>  static int rcsi2_start_receiver_gen3(struct rcar_csi2 *priv,
>  				     struct v4l2_subdev_state *state)
>  {

-- 
Regards,

Laurent Pinchart