linux-kernel - Re: [PATCH v4 5/6] scsi: ufs: Cleanup WB buffer flush toggle implementation

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Message-ID: <1608023234.10163.19.camel@mtkswgap22>
Date:   Tue, 15 Dec 2020 17:07:14 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Bean Huo <huobean@...il.com>
CC:     <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <asutoshd@...eaurora.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <beanhuo@...ron.com>,
        <bvanassche@....org>, <tomas.winkler@...el.com>,
        <cang@...eaurora.org>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 5/6] scsi: ufs: Cleanup WB buffer flush toggle
 implementation

Hi Bean,

On Fri, 2020-12-11 at 15:00 +0100, Bean Huo wrote:
> From: Bean Huo <beanhuo@...ron.com>
> 
> Delete ufshcd_wb_buf_flush_enable() and ufshcd_wb_buf_flush_disable(),
> move the implementation into ufshcd_wb_toggle_flush().
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 69 ++++++++++++++-------------------------
>  1 file changed, 24 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 0998e6103cd7..fb3c98724005 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -244,10 +244,8 @@ static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
>  static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
>  					 struct ufs_vreg *vreg);
>  static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
> -static int ufshcd_wb_buf_flush_enable(struct ufs_hba *hba);
> -static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba);
>  static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
> -static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
> +static inline int ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
>  static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba);
>  static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba);
>  
> @@ -5398,60 +5396,41 @@ static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set)
>  				index, NULL);
>  }
>  
> -static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
> -{
> -	if (hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL)
> -		return;
> -
> -	if (enable)
> -		ufshcd_wb_buf_flush_enable(hba);
> -	else
> -		ufshcd_wb_buf_flush_disable(hba);
> -
> -}
> -
> -static int ufshcd_wb_buf_flush_enable(struct ufs_hba *hba)
> +static inline int ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
>  {
>  	int ret;
>  	u8 index;
> +	enum query_opcode opcode;
>  
> -	if (!ufshcd_is_wb_allowed(hba) || hba->dev_info.wb_buf_flush_enabled)
> +	if (hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL)
>  		return 0;
>  
> -	index = ufshcd_wb_get_query_index(hba);
> -	ret = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
> -				      QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN,
> -				      index, NULL);
> -	if (ret)
> -		dev_err(hba->dev, "%s WB - buf flush enable failed %d\n",
> -			__func__, ret);
> -	else
> -		hba->dev_info.wb_buf_flush_enabled = true;
> -
> -	dev_dbg(hba->dev, "WB - Flush enabled: %d\n", ret);
> -	return ret;
> -}
> -
> -static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba)
> -{
> -	int ret;
> -	u8 index;
> -
> -	if (!ufshcd_is_wb_allowed(hba) || !hba->dev_info.wb_buf_flush_enabled)
> +	if (!ufshcd_is_wb_allowed(hba) ||
> +	    hba->dev_info.wb_buf_flush_enabled == enable)
>  		return 0;
>  
> +	if (enable)
> +		opcode = UPIU_QUERY_OPCODE_SET_FLAG;
> +	else
> +		opcode = UPIU_QUERY_OPCODE_CLEAR_FLAG;
> +
>  	index = ufshcd_wb_get_query_index(hba);
> -	ret = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
> -				      QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN,
> -				      index, NULL);
> +	ret = ufshcd_query_flag_retry(hba, opcode,
> +				      QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN, index,
> +				      NULL);
>  	if (ret) {
> -		dev_warn(hba->dev, "%s: WB - buf flush disable failed %d\n",
> -			 __func__, ret);
> -	} else {
> -		hba->dev_info.wb_buf_flush_enabled = false;
> -		dev_dbg(hba->dev, "WB - Flush disabled: %d\n", ret);
> +		dev_err(hba->dev, "%s WB-Buf Flush %s failed %d\n", __func__,
> +			enable ? "enable" : "disable", ret);
> +		goto out;
>  	}
>  
> +	if (enable)
> +		hba->dev_info.wb_buf_flush_enabled = true;
> +	else
> +		hba->dev_info.wb_buf_flush_enabled = false;

Perhaps this could be simpler as below?

hba->dev_info.wb_buf_flush_enabled = enable;

Thanks,
Stanley Chu

> +
> +	dev_dbg(hba->dev, "WB-Buf Flush %s\n", enable ? "enabled" : "disabled");
> +out:
>  	return ret;
>  }
>