linux-kernel - Re: [PATCH v1 3/4] scsi: ufs: allow customized delay for host enabling

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Date:   Thu, 05 Mar 2020 13:45:49 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        avri.altman@....com, alim.akhtar@...sung.com, jejb@...ux.ibm.com,
        beanhuo@...ron.com, asutoshd@...eaurora.org,
        matthias.bgg@...il.com, bvanassche@....org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kuohong.wang@...iatek.com, peter.wang@...iatek.com,
        chun-hung.wu@...iatek.com, andy.teng@...iatek.com
Subject: Re: [PATCH v1 3/4] scsi: ufs: allow customized delay for host
 enabling

Hi Stanley,

On 2020-03-05 12:07, Stanley Chu wrote:
> Currently a 1 ms delay is applied before polling CONTROLLER_ENABLE
> bit. This delay may not be required or can be changed in different
> controllers. Make the delay as a changeable value in struct ufs_hba to
> allow it customized by vendors.
> 
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>

Reviewed-by: Can Guo <cang@...eaurora.org>

> ---
>  drivers/scsi/ufs/ufshcd.c | 6 +++++-
>  drivers/scsi/ufs/ufshcd.h | 1 +
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index ed61ecb98b2d..39cae907abd0 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -4282,7 +4282,10 @@ int ufshcd_hba_enable(struct ufs_hba *hba)
>  	 * instruction might be read back.
>  	 * This delay can be changed based on the controller.
>  	 */
> -	usleep_range(1000, 1100);
> +	if (hba->hba_enable_delay_us) {
> +		usleep_range(hba->hba_enable_delay_us,
> +			     hba->hba_enable_delay_us + 100);
> +	}
> 
>  	/* wait for the host controller to complete initialization */
>  	retry = 10;
> @@ -8402,6 +8405,7 @@ int ufshcd_init(struct ufs_hba *hba, void
> __iomem *mmio_base, unsigned int irq)
> 
>  	hba->mmio_base = mmio_base;
>  	hba->irq = irq;
> +	hba->hba_enable_delay_us = 1000;
> 
>  	err = ufshcd_hba_init(hba);
>  	if (err)
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 49ade1bfd085..baf1143d4839 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -662,6 +662,7 @@ struct ufs_hba {
>  	u32 eh_flags;
>  	u32 intr_mask;
>  	u16 ee_ctrl_mask;
> +	u16 hba_enable_delay_us;
>  	bool is_powered;
> 
>  	/* Work Queues */