linux-kernel - RE: [PATCH V1 1/3] scsi: ufs: export api for use in vendor file

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Date:   Sun, 31 Jan 2021 13:59:56 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Nitin Rawat <nitirawa@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "stummala@...eaurora.org" <stummala@...eaurora.org>,
        "vbadigan@...eaurora.org" <vbadigan@...eaurora.org>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>
CC:     "bvanassche@....org" <bvanassche@....org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Bao D . Nguyen" <nguyenb@...eaurora.org>
Subject: RE: [PATCH V1 1/3] scsi: ufs: export api for use in vendor file

> 
> Exporting functions ufshcd_set_dev_pwr_mode, ufshcd_disable_vreg
> and ufshcd_enable_vreg so that vendor drivers can make use of
> them in setting vendor specific regulator setting
> in vendor specific file.
As for ufshcd_{enable,disable}_vreg - maybe inline ufshcd_toggle_vreg and use it instead?

> 
> Signed-off-by: Nitin Rawat <nitirawa@...eaurora.org>
> Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 9 ++++++---
>  drivers/scsi/ufs/ufshcd.h | 4 ++++
>  2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 9c691e4..000a03a 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -8091,7 +8091,7 @@ static int ufshcd_config_vreg(struct device *dev,
>         return ret;
>  }
> 
> -static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
> +int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
>  {
>         int ret = 0;
> 
> @@ -8110,8 +8110,9 @@ static int ufshcd_enable_vreg(struct device *dev,
> struct ufs_vreg *vreg)
>  out:
>         return ret;
>  }
> +EXPORT_SYMBOL(ufshcd_enable_vreg);
Why do you need to export it across the kernel?
Isn't making it non-static suffices?
Do you need it for a loadable module?

> 
> -static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
> +int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
>  {
>         int ret = 0;
> 
> @@ -8131,6 +8132,7 @@ static int ufshcd_disable_vreg(struct device *dev,
> struct ufs_vreg *vreg)
>  out:
>         return ret;
>  }
> +EXPORT_SYMBOL(ufshcd_disable_vreg);
> 
>  static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on)
>  {
> @@ -8455,7 +8457,7 @@ ufshcd_send_request_sense(struct ufs_hba *hba,
> struct scsi_device *sdp)
>   * Returns 0 if requested power mode is set successfully
>   * Returns non-zero if failed to set the requested power mode
>   */
> -static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
> +int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
>                                      enum ufs_dev_pwr_mode pwr_mode)
>  {
>         unsigned char cmd[6] = { START_STOP };
> @@ -8513,6 +8515,7 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba
> *hba,
>         hba->host->eh_noresume = 0;
>         return ret;
>  }
> +EXPORT_SYMBOL(ufshcd_set_dev_pwr_mode);
> 
>  static int ufshcd_link_state_transition(struct ufs_hba *hba,
>                                         enum uic_link_state req_link_state,
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index ee61f82..1410c95 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -997,6 +997,10 @@ extern int ufshcd_dme_get_attr(struct ufs_hba *hba,
> u32 attr_sel,
>                                u32 *mib_val, u8 peer);
>  extern int ufshcd_config_pwr_mode(struct ufs_hba *hba,
>                         struct ufs_pa_layer_attr *desired_pwr_mode);
> +extern int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
> +                                               enum ufs_dev_pwr_mode pwr_mode);
> +extern int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg);
> +extern int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg);
> 
>  /* UIC command interfaces for DME primitives */
>  #define DME_LOCAL      0
> --
> 2.7.4