linux-kernel - Re: [PATCH v2] powerpc/setup_64: Set cache-line-size based on cache-block-size

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Date:   Thu, 16 Apr 2020 21:28:15 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     "christophe.leroy@....fr" <christophe.leroy@....fr>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "oss@...error.net" <oss@...error.net>,
        "tglx@...utronix.de" <tglx@...utronix.de>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hamish Martin <Hamish.Martin@...iedtelesis.co.nz>
Subject: Re: [PATCH v2] powerpc/setup_64: Set cache-line-size based on
 cache-block-size

On Thu, 2020-04-16 at 21:43 +1000, Michael Ellerman wrote:
> Chris Packham <Chris.Packham@...iedtelesis.co.nz> writes:
> > Hi All,
> > 
> > On Wed, 2020-03-25 at 16:18 +1300, Chris Packham wrote:
> > > If {i,d}-cache-block-size is set and {i,d}-cache-line-size is
> > > not,
> > > use
> > > the block-size value for both. Per the devicetree spec cache-
> > > line-
> > > size
> > > is only needed if it differs from the block size.
> > > 
> > > Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> > > ---
> > > It looks as though the bsizep = lsizep is not required per the
> > > spec
> > > but it's
> > > probably safer to retain it.
> > > 
> > > Changes in v2:
> > > - Scott pointed out that u-boot should be filling in the cache
> > > properties
> > >   (which it does). But it does not specify a cache-line-size
> > > because
> > > it
> > >   provides a cache-block-size and the spec says you don't have to
> > > if
> > > they are
> > >   the same. So the error is in the parsing not in the devicetree
> > > itself.
> > > 
> > 
> > Ping? This thread went kind of quiet.
> 
> I replied in the other thread:
> 
>   
> https://lore.kernel.org/linuxppc-dev/87369xx99u.fsf@mpe.ellerman.id.au/
> 
> But then the merge window happened which is a busy time.
> 

Yeah I figured that was the case.

> What I'd really like is a v3 that incorporates the info I wrote in
> the
> other thread and a Fixes tag.
> 
> If you feel like doing that, that would be great. Otherwise I'll do
> it
> tomorrow.

I'll rebase against Linus's tree and have a go a adding some more words
to the commit message.

> 
> cheers