From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.peter~sen@oracle.com>,
<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
<jejb@linux.ibm.com>, <bvanassche@acm.org>
Cc: Stanley Chu <stanley.chu@mediatek.com>,
andy.teng@mediatek.com, chun-hung.wu@mediatek.com,
kuohong.wang@mediatek.com, linux-kernel@vger.kernel.org,
cang@codeaurora.org, linux-mediatek@lists.infradead.org,
peter.wang@mediatek.com, matthias.bgg@gmail.com,
beanhuo@micron.com, linux-arm-kernel@lists.infradead.org,
asutoshd@codeaurora.org
Subject: [PATCH v7 3/7] scsi: ufs: introduce common and flexible delay function
Date: Wed, 18 Mar 2020 18:40:12 +0800 [thread overview]
Message-ID: <20200318104016.28049-4-stanley.chu@mediatek.com> (raw)
In-Reply-To: <20200318104016.28049-1-stanley.chu@mediatek.com>
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@mediatek.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Can Guo <cang@codeaurora.org>
---
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
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next prev parent reply other threads:[~2020-03-18 10:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-18 10:40 [PATCH v7 0/7] scsi: ufs: some cleanups and make the delay for host enabling customizable Stanley Chu
2020-03-18 10:40 ` [PATCH v7 1/7] scsi: ufs: fix uninitialized tx_lanes in ufshcd_disable_tx_lcc() Stanley Chu
2020-03-18 10:40 ` [PATCH v7 2/7] scsi: ufs: use an enum for host capabilities Stanley Chu
2020-03-18 22:42 ` [EXT] " Bean Huo (beanhuo)
2020-03-18 10:40 ` Stanley Chu [this message]
2020-03-18 22:10 ` [EXT] [PATCH v7 3/7] scsi: ufs: introduce common and flexible delay function Bean Huo (beanhuo)
2020-03-19 0:10 ` Stanley Chu
2020-03-18 10:40 ` [PATCH v7 4/7] scsi: ufs-mediatek: use common delay function for required places Stanley Chu
2020-03-18 10:40 ` [PATCH v7 5/7] scsi: ufs: allow customized delay for host enabling Stanley Chu
2020-03-18 10:40 ` [PATCH v7 6/7] scsi: ufs: make HCE polling more compact to improve initialization latency Stanley Chu
2020-03-18 10:40 ` [PATCH v7 7/7] scsi: ufs-mediatek: customize the delay for host enabling Stanley Chu
2020-03-27 2:09 ` [PATCH v7 0/7] scsi: ufs: some cleanups and make the delay for host enabling customizable Martin K. Petersen
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