linux-kernel - Re: [PATCH] media: rcar-csi2: fix R8A77980 support

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Date:   Fri, 24 Sep 2021 11:43:57 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Nikita Yushchenko <nikita.yoush@...entembedded.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vladimir Barinov <vladimir.barinov@...entembedded.com>
Subject: Re: [PATCH] media: rcar-csi2: fix R8A77980 support

Hello Nikita and Vladimir,

Thanks for your work.

On 2021-09-24 12:02:45 +0300, Nikita Yushchenko wrote:
> From: Vladimir Barinov <vladimir.barinov@...entembedded.com>
> 
> Add missing initialization of num_channels field.

The num_channels field is intentionally left out here, and therefore 
initialized to 0.

The reason for this is that tho even if the VCDT and VCDT2 register 
exists on V3H the datasheet states that the value written to them should 
always be 0. As the only usage of num_channels is to create the content 
to write to these registers in rcsi2_start_receiver() setting it to 0 
does the correct thing for V3H.

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

> 
> Fixes: 3ba37c2bcb0c ("media: rcar-csi2: add R8A77980 support")
> Signed-off-by: Vladimir Barinov <vladimir.barinov@...entembedded.com>
> Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
> ---
>  drivers/media/platform/rcar-vin/rcar-csi2.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
> index e28eff039688..f4d3c6dead30 100644
> --- a/drivers/media/platform/rcar-vin/rcar-csi2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> @@ -1146,6 +1146,7 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a77980 = {
>  	.init_phtw = rcsi2_init_phtw_h3_v3h_m3n,
>  	.hsfreqrange = hsfreqrange_h3_v3h_m3n,
>  	.csi0clkfreqrange = 0x20,
> +	.num_channels = 4,
>  	.clear_ulps = true,
>  };
>  
> -- 
> 2.30.2
> 

-- 
Regards,
Niklas Söderlund