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SubjectRe: [PATCH v3 05/15] scsi: ufs: increase fDeviceInit query response timeout
From
2015-09-02 19:13 GMT+09:00 Yaniv Gardi <ygardi@codeaurora.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@codeaurora.org>
> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.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 */

How about just increasing QUERY_REQ_TIMEOUT from 30ms to 600ms
instead of conditionally setting timeout depending on ufs flag?

>
> /* 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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