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Message-ID: <4ef60ffd-3661-4bca-91a3-b49d6189c71b@intel.com>
Date:   Mon, 25 Sep 2023 13:21:05 +0300
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Subject: Re: [PATCH 2/6] mmc: sdhci: add __sdhci_execute_tuning() to header
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To:     Drew Fustini <dfustini@baylibre.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Jisheng Zhang <jszhang@kernel.org>,
        Guo Ren <guoren@kernel.org>, Fu Wei <wefu@redhat.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Conor Dooley <conor@kernel.org>
Cc:     Robert Nelson <robertcnelson@beagleboard.org>,
        Jason Kridner <jkridner@beagleboard.org>,
        Xi Ruoyao <xry111@xry111.site>, Han Gao <gaohan@iscas.ac.cn>,
        Icenowy Zheng <uwu@icenowy.me>, linux-mmc@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-riscv@lists.infradead.org
References: <20230921-th1520-mmc-v1-0-49f76c274fb3@baylibre.com>
 <20230921-th1520-mmc-v1-2-49f76c274fb3@baylibre.com>
From:   Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
 Business Identity Code: 0357606 - 4, Domiciled in Helsinki
In-Reply-To: <20230921-th1520-mmc-v1-2-49f76c274fb3@baylibre.com>
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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@baylibre.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);

>  {
>  	int i;
>  
> 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);
>