Introduce a common delay function to provide flexible way for users
to take choices of udelay and usleep_range into consideration according
to the required delay time.
Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>
Reviewed-by: Can Guo <cang@xxxxxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 12 ++++++++++++
drivers/scsi/ufs/ufshcd.h | 1 +
2 files changed, 13 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 314e808b0d4e..a42a84164dec 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -597,6 +597,18 @@ static void ufshcd_print_pwr_info(struct ufs_hba *hba)
hba->pwr_info.hs_rate);
}
+void ufshcd_delay_us(unsigned long us, unsigned long tolerance)
+{
+ if (!us)
+ return;
+
+ if (us < 10)
+ udelay(us);
+ else
+ usleep_range(us, us + tolerance);
+}
+EXPORT_SYMBOL_GPL(ufshcd_delay_us);
+
/*
* ufshcd_wait_for_register - wait for register value to change
* @hba - per-adapter interface
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 52425371082a..9a14ff3d5f8b 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -792,6 +792,7 @@ int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int);
int ufshcd_make_hba_operational(struct ufs_hba *hba);
void ufshcd_remove(struct ufs_hba *);
int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
+void ufshcd_delay_us(unsigned long us, unsigned long tolerance);
int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
u32 val, unsigned long interval_us,
unsigned long timeout_ms, bool can_sleep);
--
2.18.0
