linux-kernel - Re: [PATCH v8 2/3] media: rcar-csi2: Add warning for PHY speed less than minimum

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Message-ID: <20200630220502.GK2365286@oden.dyn.berto.se>
Date:   Wed, 1 Jul 2020 00:05:02 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Suresh Udipi <sudipi@...adit-jv.com>
Cc:     mrodin@...adit-jv.com, akiyama@...-osk.co.jp,
        efriedrich@...adit-jv.com, erosca@...adit-jv.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, mchehab@...nel.org,
        michael@...in.online, securitycheck@...so.co.jp
Subject: Re: [PATCH v8 2/3] media: rcar-csi2: Add warning for PHY speed less
 than minimum

Hi Suresh,

Thanks for your patch.

On 2020-06-18 19:34:31 +0900, Suresh Udipi wrote:
> Add a warning message when the selected PHY speed is less
> than supported minimum PHY speed given in the hsfreq table[1].
> 
> For raspberry pi camera capture on Kingfisher board with resolution
> 640x480, the calculated PHY speed is 48 mbps which is less than
> the minimum PHY speed 80 Mbps from the table[1]. But in this cases
> capture is successful.
> 
> [1] specs r19uh0105ej0200-r-car-3rd-generation.pdf [Table 25.9]
> 
> Signed-off-by: Suresh Udipi <sudipi@...adit-jv.com>
> Signed-off-by: Michael Rodin <mrodin@...adit-jv.com>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
>  drivers/media/platform/rcar-vin/rcar-csi2.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
> index f18dedc..1184527 100644
> --- a/drivers/media/platform/rcar-vin/rcar-csi2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> @@ -433,6 +433,10 @@ static int rcsi2_set_phypll(struct rcar_csi2 *priv, unsigned int mbps)
>  	const struct rcsi2_mbps_reg *hsfreq;
>  	const struct rcsi2_mbps_reg *hsfreq_prev = NULL;
>  
> +	if (mbps < priv->info->hsfreqrange->mbps)
> +		dev_warn(priv->dev, "%u Mbps less than min PHY speed %u Mbps",
> +			 mbps, priv->info->hsfreqrange->mbps);
> +
>  	for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++) {
>  		if (hsfreq->mbps >= mbps)
>  			break;
> -- 
> 2.7.4
> 

-- 
Regards,
Niklas Söderlund