linux-kernel - Re: [PATCH 1/7] media: sun6i-csi: Fix the bpp for 10-bit bayer formats

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Message-ID: <20200825172309.6756760d@lhopital-XPS-13-9360>
Date:   Tue, 25 Aug 2020 17:23:09 +0200
From:   Kévin L'hôpital <kevin.lhopital@...tlin.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     linux-media@...r.kernel.org, mchehab@...nel.org,
        robh+dt@...nel.org, mark.rutland@....com, wens@...e.org,
        yong.deng@...ewell.com, p.zabel@...gutronix.de,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        paul.kocialkowski@...tlin.com, thomas.petazzoni@...tlin.com
Subject: Re: [PATCH 1/7] media: sun6i-csi: Fix the bpp for 10-bit bayer
 formats

Hello,

Le Mon, 24 Aug 2020 18:55:36 +0200,
Maxime Ripard <maxime@...no.tech> a écrit :

> On Fri, Aug 21, 2020 at 04:59:29PM +0200, Kévin L'hôpital wrote:
> > 10-bit bayer formats are aligned to 16 bits in memory, so this is
> > what needs to be used as bpp for calculating the size of the
> > buffers to allocate.
> > 
> > Signed-off-by: Kévin L'hôpital <kevin.lhopital@...tlin.com>  
> 
> Generally speaking, you should also explain why it's not an issue for
> the callers. Depending on what that function is supposed to be doing
> (returning the padded bits or the padded bits per pixel), your patch
> could be either right or wrong.
> 
> Since all the callers are using it to generate the number of bytes per
> line, your patch is indeed correct. But it should be mentionned in the
> commit log.
> 
> Maxime

All right, I will add this explanation.

Thank you very much for the review

Kévin 

-- 
Kevin L'Hopital, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com