linux-kernel - Re: [PATCH 2/6] mmc: sdhci: add __sdhci_execute

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Date:   Mon, 25 Sep 2023 16:41:30 +0200
From:   Drew Fustini <dfustini@...libre.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor@...nel.org>,
        Robert Nelson <robertcnelson@...gleboard.org>,
        Jason Kridner <jkridner@...gleboard.org>,
        Xi Ruoyao <xry111@...111.site>, Han Gao <gaohan@...as.ac.cn>,
        Icenowy Zheng <uwu@...nowy.me>, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 2/6] mmc: sdhci: add __sdhci_execute_tuning() to header

On Mon, Sep 25, 2023 at 01:21:05PM +0300, Adrian Hunter wrote:
> On 22/09/23 04:49, Drew Fustini wrote:
> > Expose __sdhci_execute_tuning() so that it can be called from the
> > mmc host controller drivers.
> > 
> > In the sdhci-of-dwcmshc driver, sdhci_dwcmshc_th1520_ops sets
> > platform_execute_tuning to th1520_execute_tuning(). That function has
> > to manipulate phy registers before tuning can be performed. To avoid
> > copying the code verbatim from __sdhci_execute_tuning() into
> > th1520_execute_tuning(), make it possible for __sdhci_execute_tuning()
> > to be called from sdhci-of-dwcmshc.
> > 
> > Signed-off-by: Drew Fustini <dfustini@...libre.com>
> > ---
> >  drivers/mmc/host/sdhci.c | 2 +-
> >  drivers/mmc/host/sdhci.h | 1 +
> >  2 files changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index ff41aa56564e..fd607058d176 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -2841,7 +2841,7 @@ void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
> >  }
> >  EXPORT_SYMBOL_GPL(sdhci_send_tuning);
> >  
> > -static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
> > +int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
> 
> Also need
> 	EXPORT_SYMBOL_GPL(__sdhci_execute_tuning);

Thank, I will add that.

I wasn't sure if making __sdhci_execute_tuning() available outside of
sdhci.c was going to be seen as an acceptable solution.

Do you think my apporach is acceptable (once I add EXPORT_SYMBOL_GPL)?

Thanks,
Drew