linux-kernel - Re: [PATCH -next] mmc: sdhci-pci-gli: Fix build error unused-function

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Date:   Wed, 22 Jun 2022 11:58:11 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ren Zhijie <renzhijie2@...wei.com>, ulf.hansson@...aro.org,
        reniuschengl@...il.com, jasonlai.genesyslogic@...il.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] mmc: sdhci-pci-gli: Fix build error unused-function

On 19/06/22 13:47, Ren Zhijie wrote:
> If CONFIG_PM is not set.
> 
> make ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu-, will be failed, like this:
> 
> drivers/mmc/host/sdhci-pci-gli.c:834:13: error: ‘gl9763e_set_low_power_negotiation’ defined but not used [-Werror=unused-function]
>  static void gl9763e_set_low_power_negotiation(struct sdhci_pci_slot *slot, bool enable)
>              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> make[3]: *** [drivers/mmc/host/sdhci-pci-gli.o] Error 1
> 
> To fix building warning, wrap all related code with CONFIG_PM.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 78fe993ae714("mmc: host: Improve I/O read/write performance for GL9763E")
> Signed-off-by: Ren Zhijie <renzhijie2@...wei.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-pci-gli.c | 50 ++++++++++++++++----------------
>  1 file changed, 25 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index a76506adc206..4d509f656188 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -831,31 +831,6 @@ static void sdhci_gl9763e_dumpregs(struct mmc_host *mmc)
>  	sdhci_dumpregs(mmc_priv(mmc));
>  }
>  
> -static void gl9763e_set_low_power_negotiation(struct sdhci_pci_slot *slot, bool enable)
> -{
> -	struct pci_dev *pdev = slot->chip->pdev;
> -	u32 value;
> -
> -	pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
> -	value &= ~GLI_9763E_VHS_REV;
> -	value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_W);
> -	pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
> -
> -	pci_read_config_dword(pdev, PCIE_GLI_9763E_CFG, &value);
> -
> -	if (enable)
> -		value &= ~GLI_9763E_CFG_LPSN_DIS;
> -	else
> -		value |= GLI_9763E_CFG_LPSN_DIS;
> -
> -	pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG, value);
> -
> -	pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
> -	value &= ~GLI_9763E_VHS_REV;
> -	value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_R);
> -	pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
> -}
> -
>  static void sdhci_gl9763e_cqe_pre_enable(struct mmc_host *mmc)
>  {
>  	struct cqhci_host *cq_host = mmc->cqe_private;
> @@ -991,6 +966,31 @@ static void gli_set_gl9763e(struct sdhci_pci_slot *slot)
>  }
>  
>  #ifdef CONFIG_PM
> +static void gl9763e_set_low_power_negotiation(struct sdhci_pci_slot *slot, bool enable)
> +{
> +	struct pci_dev *pdev = slot->chip->pdev;
> +	u32 value;
> +
> +	pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
> +	value &= ~GLI_9763E_VHS_REV;
> +	value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_W);
> +	pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
> +
> +	pci_read_config_dword(pdev, PCIE_GLI_9763E_CFG, &value);
> +
> +	if (enable)
> +		value &= ~GLI_9763E_CFG_LPSN_DIS;
> +	else
> +		value |= GLI_9763E_CFG_LPSN_DIS;
> +
> +	pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG, value);
> +
> +	pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
> +	value &= ~GLI_9763E_VHS_REV;
> +	value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_R);
> +	pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
> +}
> +
>  static int gl9763e_runtime_suspend(struct sdhci_pci_chip *chip)
>  {
>  	struct sdhci_pci_slot *slot = chip->slots[0];