linux-kernel - Re: [PATCH v3 2/7] mmc: sdhci: add __sdhci_execute

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Date:   Wed, 25 Oct 2023 23:29:25 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Drew Fustini <dfustini@...libre.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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        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 v3 2/7] mmc: sdhci: add __sdhci_execute_tuning() to header

On Mon, Oct 23, 2023 at 02:07:03PM -0700, 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

Hi Drew,

Just FYI, my th1520 version patch in my local repo overrides the
mmc_host_ops.execute_tuning as the following:

host->mmc_host_ops.execute_tuning = dwcmshc_execute_tuning;

In dwcmshc_execute_tuning(), I will do some necessary setting then
call sdhci_execute_tuning();

So I don't need to export __sdhci_execute_tuning(). The main reason
is that the __abc symbol is expected to be used internally. However,
I have no big preference. I would leave the decision be made by
mmc maintainers @Ulf @Adrian, can you please comment?

Thanks

> 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 | 3 ++-
>  drivers/mmc/host/sdhci.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index ff41aa56564e..c79f73459915 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)
>  {
>  	int i;
>  
> @@ -2879,6 +2879,7 @@ static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
>  	sdhci_reset_tuning(host);
>  	return -EAGAIN;
>  }
> +EXPORT_SYMBOL_GPL(__sdhci_execute_tuning);
>  
>  int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>  {
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index f219bdea8f28..a20864fc0641 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -793,6 +793,7 @@ void sdhci_set_bus_width(struct sdhci_host *host, int width);
>  void sdhci_reset(struct sdhci_host *host, u8 mask);
>  void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
>  int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
> +int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode);
>  void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
>  int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
>  				      struct mmc_ios *ios);
> 
> -- 
> 2.34.1
>