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scsi: ufs: introduce common and flexible delay function 

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.

Link: https://lore.kernel.org/r/20200318104016.28049-4-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Stanley Chu 2020-03-18 18:40:12 +08:00 committed by Martin K. Petersen
parent c2014682d0
commit 5c955c10d0
2 changed files with 13 additions and 0 deletions
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12
drivers/scsi/ufs/ufshcd.c
View File

@ -535,6 +535,18 @@ static void ufshcd_print_pwr_info(struct ufs_hba *hba)
hba->pwr_info.hs_rate); 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 * ufshcd_wait_for_register - wait for register value to change
* @hba - per-adapter interface * @hba - per-adapter interface

1
drivers/scsi/ufs/ufshcd.h
View File

@ -797,6 +797,7 @@ int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int);
int ufshcd_make_hba_operational(struct ufs_hba *hba); int ufshcd_make_hba_operational(struct ufs_hba *hba);
void ufshcd_remove(struct ufs_hba *); void ufshcd_remove(struct ufs_hba *);
int ufshcd_uic_hibern8_exit(struct ufs_hba *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, int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
u32 val, unsigned long interval_us, u32 val, unsigned long interval_us,
unsigned long timeout_ms, bool can_sleep); unsigned long timeout_ms, bool can_sleep);