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

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Date:   Wed, 18 Dec 2019 15:53:37 -0800
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Stanley Chu <stanley.chu@...iatek.com>, linux-scsi@...r.kernel.org,
        martin.petersen@...cle.com, avri.altman@....com,
        alim.akhtar@...sung.com, pedrom.sousa@...opsys.com,
        jejb@...ux.ibm.com, matthias.bgg@...il.com
Cc:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        beanhuo@...ron.com, 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 12/13/2019 12:11 AM, Stanley Chu 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>
> ---
>   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
> 

Looks good to me.

Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>

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