linux-kernel - Re: [PATCH v3 06/26] crypto: rockchip: add fallback for cipher

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Date:   Wed, 23 Mar 2022 14:07:25 +0100
From:   LABBE Corentin <clabbe@...libre.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     heiko@...ech.de, herbert@...dor.apana.org.au, krzk+dt@...nel.org,
        mturquette@...libre.com, robh+dt@...nel.org, sboyd@...nel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v3 06/26] crypto: rockchip: add fallback for cipher

Le Tue, Mar 22, 2022 at 11:25:25AM +0000, Robin Murphy a écrit :
> On 2022-03-21 20:07, Corentin Labbe wrote:
> > The hardware does not handle 0 size length request, let's add a
> > fallback.
> > Furthermore fallback will be used for all unaligned case the hardware
> > cannot handle.
> > 
> > Fixes: ce0183cb6464b ("crypto: rockchip - switch to skcipher API")
> > Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> > ---
> >   drivers/crypto/Kconfig                        |   4 +
> >   drivers/crypto/rockchip/rk3288_crypto.h       |   2 +
> >   .../crypto/rockchip/rk3288_crypto_skcipher.c  | 105 +++++++++++++++---
> >   3 files changed, 98 insertions(+), 13 deletions(-)
> > 
> > diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
> > index 7b2d138bc83e..84ab14afcbd9 100644
> > --- a/drivers/crypto/Kconfig
> > +++ b/drivers/crypto/Kconfig
> > @@ -784,6 +784,10 @@ config CRYPTO_DEV_IMGTEC_HASH
> >   config CRYPTO_DEV_ROCKCHIP
> >   	tristate "Rockchip's Cryptographic Engine driver"
> >   	depends on OF && ARCH_ROCKCHIP
> > +	depends on PM
> 
> This appears to belong to patch #13 rather than this one.
> 

Hello

Yes this is an error, I will move it this line on the right patch.

> My initial thought was that it probably shouldn't be something for 
> random consumers to care about at all, but there do seem to be a handful 
> of other drivers relying on pm_runtime_resume to enable their clocks, so 
> I guess maybe it's an acceptable idiom :/
> 

Depending on PM made the driver easier to understand (no more if PM/if not PM).
And anyway, since it's embedded device, PM should be always enabled.

Thanks