linux-kernel - Re: [PATCH v5 05/15] scsi: ufs: increase fDeviceInit query response timeout

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Date:	Tue, 27 Oct 2015 14:56:55 -0000
From:	"Gilad Broner" <gbroner@...eaurora.org>
To:	"Yaniv Gardi" <ygardi@...eaurora.org>
Cc:	robherring2@...il.com, james.bottomley@...senpartnership.com,
	pebolle@...cali.nl, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
	ygardi@...eaurora.org, gbroner@...eaurora.org,
	draviv@...eaurora.org,
	"Vinayak Holikatti" <vinholikatti@...il.com>,
	"James E.J. Bottomley" <jbottomley@...n.com>
Subject: Re: [PATCH v5 05/15] scsi: ufs: increase fDeviceInit query response
 timeout

Reviewed-by: Gilad Broner <gbroner@...eaurora.org>

> fDeviceInit query response time for some devices is too long that default
> query request timeout of 100ms may not be enough. Experiments show that
> fDeviceInit response sometimes takes 500ms so to be on safer side this
> change sets the timeout to 600ms. Without this change, we might
> unnecessarily have to retry fDeviceInit query requests multiple times and
> each query request timeout prints one error message.
>
> Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> ---
>  drivers/scsi/ufs/ufshcd.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index e0b8755..573a8cb 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -58,6 +58,12 @@
>  #define QUERY_REQ_RETRIES 10
>  /* Query request timeout */
>  #define QUERY_REQ_TIMEOUT 30 /* msec */
> +/*
> + * Query request timeout for fDeviceInit flag
> + * fDeviceInit query response time for some devices is too large that
> default
> + * QUERY_REQ_TIMEOUT may not be enough for such devices.
> + */
> +#define QUERY_FDEVICEINIT_REQ_TIMEOUT 600 /* msec */
>
>  /* Task management command timeout */
>  #define TM_CMD_TIMEOUT	100 /* msecs */
> @@ -1651,6 +1657,7 @@ static int ufshcd_query_flag(struct ufs_hba *hba,
> enum query_opcode opcode,
>  	struct ufs_query_req *request = NULL;
>  	struct ufs_query_res *response = NULL;
>  	int err, index = 0, selector = 0;
> +	int timeout = QUERY_REQ_TIMEOUT;
>
>  	BUG_ON(!hba);
>
> @@ -1683,7 +1690,10 @@ static int ufshcd_query_flag(struct ufs_hba *hba,
> enum query_opcode opcode,
>  		goto out_unlock;
>  	}
>
> -	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
> +	if (idn == QUERY_FLAG_IDN_FDEVICEINIT)
> +		timeout = QUERY_FDEVICEINIT_REQ_TIMEOUT;
> +
> +	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, timeout);
>
>  	if (err) {
>  		dev_err(hba->dev,
> --
> 1.8.5.2
>
> --
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> --
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>


-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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