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scsi: ufs: add retries for hibern8 enter

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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>
This commit is contained in:
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 @@ static int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode)
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)