linux-kernel - Re: [PATCH v1 3/9] scsi: ufs: Override auto suspend tunables for ufs

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Date:   Wed, 11 Jul 2018 13:46:14 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Asutosh Das <asutoshd@...eaurora.org>, subhashj@...eaurora.org,
        cang@...eaurora.org, vivek.gautam@...eaurora.org,
        rnayak@...eaurora.org, vinholikatti@...il.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org
Cc:     Sujit Reddy Thumma <sthumma@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        Gilad Broner <gbroner@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 3/9] scsi: ufs: Override auto suspend tunables for ufs

On 06/07/18 15:30, Asutosh Das wrote:
> From: Sujit Reddy Thumma <sthumma@...eaurora.org>
> 
> Override auto suspend tunables for UFS device LUNs during
> initialization so as to efficiently manage background operations
> and the power consumption.
> 
> Signed-off-by: Sujit Reddy Thumma <sthumma@...eaurora.org>
> Signed-off-by: Gilad Broner <gbroner@...eaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/scsi/ufs/ufshcd.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 77e2b3e..b03f3ea 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -89,6 +89,9 @@
>  /* Interrupt aggregation default timeout, unit: 40us */
>  #define INT_AGGR_DEF_TO	0x02
>  
> +/* default value of auto suspend is 3 seconds */
> +#define UFSHCD_AUTO_SUSPEND_DELAY_MS 3000 /* millisecs */
> +
>  #define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
>  	({                                                              \
>  		int _ret;                                               \
> @@ -4528,6 +4531,9 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
>  	blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
>  	blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
>  
> +	sdev->autosuspend_delay = UFSHCD_AUTO_SUSPEND_DELAY_MS;
> +	sdev->use_rpm_auto = 1;
> +
>  	return 0;
>  }
>  
>