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scsi: ufs: Change fDeviceInit busy wait 

Currently, the UFS driver busy waits for fDeviceInit to be cleared. Provide
an upper bound and sleep between attempts instead of busy waiting.

Link: https://lore.kernel.org/r/1597053747-75171-1-git-send-email-kwmad.kim@samsung.com
Tested-by: Kiwoong Kim <kwmad.kim@samsung.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Kiwoong Kim 2020-08-10 19:02:27 +09:00 committed by Martin K. Petersen
parent b000862579
commit 29707fab58
1 changed files with 21 additions and 12 deletions
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23
drivers/scsi/ufs/ufshcd.c
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@ -74,6 +74,9 @@
/* Default value of wait time before gating device ref clock */
#define UFSHCD_REF_CLK_GATING_WAIT_US 0xFF /* microsecs */
/* Polling time to wait for fDeviceInit */
#define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */
#define ufshcd_toggle_vreg(_dev, _vreg, _on) \
({ \
int _ret; \
@ -4175,9 +4178,9 @@ EXPORT_SYMBOL_GPL(ufshcd_config_pwr_mode);
*/
static int ufshcd_complete_dev_init(struct ufs_hba *hba)
{
int i;
int err;
bool flag_res = true;
ktime_t timeout;
err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
QUERY_FLAG_IDN_FDEVICEINIT, 0, NULL);
@ -4188,20 +4191,26 @@ static int ufshcd_complete_dev_init(struct ufs_hba *hba)
goto out;
}
/* poll for max. 1000 iterations for fDeviceInit flag to clear */
for (i = 0; i < 1000 && !err && flag_res; i++)
err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
/* Poll fDeviceInit flag to be cleared */
timeout = ktime_add_ms(ktime_get(), FDEVICEINIT_COMPL_TIMEOUT);
do {
err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
QUERY_FLAG_IDN_FDEVICEINIT, 0, &flag_res);
if (!flag_res)
break;
usleep_range(5000, 10000);
} while (ktime_before(ktime_get(), timeout));
if (err)
if (err) {
dev_err(hba->dev,
"%s reading fDeviceInit flag failed with error %d\n",
__func__, err);
else if (flag_res)
} else if (flag_res) {
dev_err(hba->dev,
"%s fDeviceInit was not cleared by the device\n",
__func__);
err = -EBUSY;
}
out:
return err;
}