linux-kernel - Re: [PATCH v1 2/4] scsi: ufs: export ufshcd_auto_hibern8

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Date:   Fri, 20 Dec 2019 00:02:22 +0530
From:   Alim Akhtar <alim.akhtar@...il.com>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Avri Altman <avri.altman@....com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        "Bean Huo (beanhuo)" <beanhuo@...ron.com>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        peter.wang@...iatek.com, chun-hung.wu@...iatek.com,
        andy.teng@...iatek.com
Subject: Re: [PATCH v1 2/4] scsi: ufs: export ufshcd_auto_hibern8_update for
 vendor usage

On Fri, Dec 13, 2019 at 2:07 PM Stanley Chu <stanley.chu@...iatek.com> wrote:
>
> Export ufshcd_auto_hibern8_update to allow vendors to use common
> interface to customize auto-hibernate timer.
>
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>

Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>

> ---
>  drivers/scsi/ufs/ufs-sysfs.c | 20 --------------------
>  drivers/scsi/ufs/ufshcd.c    | 18 ++++++++++++++++++
>  drivers/scsi/ufs/ufshcd.h    |  1 +
>  3 files changed, 19 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
> index ad2abc96c0f1..720be3f64be7 100644
> --- a/drivers/scsi/ufs/ufs-sysfs.c
> +++ b/drivers/scsi/ufs/ufs-sysfs.c
> @@ -118,26 +118,6 @@ static ssize_t spm_target_link_state_show(struct device *dev,
>                                 ufs_pm_lvl_states[hba->spm_lvl].link_state));
>  }
>
> -static void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
> -{
> -       unsigned long flags;
> -
> -       if (!ufshcd_is_auto_hibern8_supported(hba))
> -               return;
> -
> -       spin_lock_irqsave(hba->host->host_lock, flags);
> -       if (hba->ahit != ahit)
> -               hba->ahit = ahit;
> -       spin_unlock_irqrestore(hba->host->host_lock, flags);
> -       if (!pm_runtime_suspended(hba->dev)) {
> -               pm_runtime_get_sync(hba->dev);
> -               ufshcd_hold(hba, false);
> -               ufshcd_auto_hibern8_enable(hba);
> -               ufshcd_release(hba);
> -               pm_runtime_put(hba->dev);
> -       }
> -}
> -
>  /* Convert Auto-Hibernate Idle Timer register value to microseconds */
>  static int ufshcd_ahit_to_us(u32 ahit)
>  {
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index b5966faf3e98..589f519316aa 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3956,6 +3956,24 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
>         return ret;
>  }
>
> +void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
> +{
> +       unsigned long flags;
> +
> +       if (!(hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT))
> +               return;
> +
> +       spin_lock_irqsave(hba->host->host_lock, flags);
> +       if (hba->ahit == ahit)
> +               goto out_unlock;
> +       hba->ahit = ahit;
> +       if (!pm_runtime_suspended(hba->dev))
> +               ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
> +out_unlock:
> +       spin_unlock_irqrestore(hba->host->host_lock, flags);
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_auto_hibern8_update);
> +
>  void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
>  {
>         unsigned long flags;
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 2740f6941ec6..86586a0b9aa5 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -927,6 +927,7 @@ int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
>         enum flag_idn idn, bool *flag_res);
>
>  void ufshcd_auto_hibern8_enable(struct ufs_hba *hba);
> +void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
>
>  #define SD_ASCII_STD true
>  #define SD_RAW false
> --
> 2.18.0



-- 
Regards,
Alim