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scsi: ufs: add retries for hibern8 enter 

If hibern8 enter command fails then UFS link state may be unknown which
may result into timeout of all the commands issued after failure.

This change does 2 things (for pre-defined number of retry counts) after
hibern8 enter failure:

1. Recovers the UFS link to active state

2. If link is recovered to active state, tries to put the UFS link in
   hibern8 enter again until retry count expires.

Reviewed-by: Gilad Broner <gbroner@codeaurora.org>
Reviewed-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
hifive-unleashed-5.1
Yaniv Gardi 2016-02-01 15:02:44 +02:00 committed by Martin K. Petersen
parent 64238fbd15
commit 87d0b4a6da
1 changed files with 24 additions and 2 deletions
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26
drivers/scsi/ufs/ufshcd.c
View File

@ -74,6 +74,9 @@
/* maximum number of link-startup retries */
#define DME_LINKSTARTUP_RETRIES 3
/* Maximum retries for Hibern8 enter */
#define UIC_HIBERN8_ENTER_RETRIES 3
/* maximum number of reset retries before giving up */
#define MAX_HOST_RESET_RETRIES 5
@ -2387,13 +2390,32 @@ out:
return ret;
}
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
{
int ret;
struct uic_command uic_cmd = {0};
uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;
ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
return ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
if (ret)
dev_err(hba->dev, "%s: hibern8 enter failed. ret = %d\n",
__func__, ret);
return ret;
}
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
{
int ret = 0, retries;
for (retries = UIC_HIBERN8_ENTER_RETRIES; retries > 0; retries--) {
ret = __ufshcd_uic_hibern8_enter(hba);
if (!ret || ret == -ENOLINK)
goto out;
}
out:
return ret;
}
static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)