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| author | Stanley Chu <stanley.chu@mediatek.com> | 2020-03-18 18:40:12 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-03-26 22:07:13 -0400 |
| commit | 5c955c10d0c26eb920f9cfad11adb58c93f666a0 (patch) | |
| tree | 6bfe92ab39f675dfffdfd237308a9c4a8a921b22 /drivers/scsi | |
| parent | c2014682d03d80cfdf5eac440f8e96dce7dfe213 (diff) | |
| download | linux-5c955c10d0c26eb920f9cfad11adb58c93f666a0.tar.gz linux-5c955c10d0c26eb920f9cfad11adb58c93f666a0.tar.bz2 linux-5c955c10d0c26eb920f9cfad11adb58c93f666a0.zip | |
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>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 12 | ||||
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.h | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 597b704dea57..bd1119fe34f3 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -535,6 +535,18 @@ 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 91a47ea61d9a..493674f99dcc 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -797,6 +797,7 @@ 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); |