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From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.petersen@oracle.com>,
	<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
	<jejb@linux.ibm.com>
Cc: <beanhuo@micron.com>, <asutoshd@codeaurora.org>,
	<cang@codeaurora.org>, <matthias.bgg@gmail.com>,
	<bvanassche@acm.org>, <linux-mediatek@lists.infradead.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <kuohong.wang@mediatek.com>,
	<peter.wang@mediatek.com>, <chun-hung.wu@mediatek.com>,
	<andy.teng@mediatek.com>, Stanley Chu <stanley.chu@mediatek.com>
Subject: [PATCH v1 1/2] scsi: ufs: add required delay after gating reference clock
Date: Mon, 17 Feb 2020 17:35:58 +0800	[thread overview]
Message-ID: <20200217093559.16830-2-stanley.chu@mediatek.com> (raw)
In-Reply-To: <20200217093559.16830-1-stanley.chu@mediatek.com>

In UFS version 3.0, a newly added attribute bRefClkGatingWaitTime defines
the minimum time for which the reference clock is required by device during
transition to LS-MODE or HIBERN8 state.

Currently this time is detected and stored in
hba->dev_info.clk_gating_wait_us but applied to vendor implementatios only.
Make it applied to reference clock named as "ref_clk" in device tree in
common path.

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
 drivers/scsi/ufs/ufshcd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 744b8254220c..7f60721f54d1 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7417,8 +7417,10 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 	struct ufs_clk_info *clki;
 	struct list_head *head = &hba->clk_list_head;
 	unsigned long flags;
+	unsigned long wait_us;
 	ktime_t start = ktime_get();
 	bool clk_state_changed = false;
+	bool ref_clk;
 
 	if (list_empty(head))
 		goto out;
@@ -7436,7 +7438,8 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 
 	list_for_each_entry(clki, head, list) {
 		if (!IS_ERR_OR_NULL(clki->clk)) {
-			if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
+			ref_clk = !strcmp(clki->name, "ref_clk") ? true : false;
+			if (skip_ref_clk && ref_clk)
 				continue;
 
 			clk_state_changed = on ^ clki->enabled;
@@ -7449,6 +7452,9 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 				}
 			} else if (!on && clki->enabled) {
 				clk_disable_unprepare(clki->clk);
+				wait_us = hba->dev_info.clk_gating_wait_us;
+				if (ref_clk && wait_us)
+					usleep_range(wait_us, wait_us + 10);
 			}
 			clki->enabled = on;
 			dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
-- 
2.18.0

WARNING: multiple messages have this Message-ID (diff)
From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.petersen@oracle.com>,
	<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
	<jejb@linux.ibm.com>
Cc: Stanley Chu <stanley.chu@mediatek.com>,
	bvanassche@acm.org, 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 v1 1/2] scsi: ufs: add required delay after gating reference clock
Date: Mon, 17 Feb 2020 17:35:58 +0800	[thread overview]
Message-ID: <20200217093559.16830-2-stanley.chu@mediatek.com> (raw)
In-Reply-To: <20200217093559.16830-1-stanley.chu@mediatek.com>

In UFS version 3.0, a newly added attribute bRefClkGatingWaitTime defines
the minimum time for which the reference clock is required by device during
transition to LS-MODE or HIBERN8 state.

Currently this time is detected and stored in
hba->dev_info.clk_gating_wait_us but applied to vendor implementatios only.
Make it applied to reference clock named as "ref_clk" in device tree in
common path.

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
 drivers/scsi/ufs/ufshcd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 744b8254220c..7f60721f54d1 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7417,8 +7417,10 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 	struct ufs_clk_info *clki;
 	struct list_head *head = &hba->clk_list_head;
 	unsigned long flags;
+	unsigned long wait_us;
 	ktime_t start = ktime_get();
 	bool clk_state_changed = false;
+	bool ref_clk;
 
 	if (list_empty(head))
 		goto out;
@@ -7436,7 +7438,8 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 
 	list_for_each_entry(clki, head, list) {
 		if (!IS_ERR_OR_NULL(clki->clk)) {
-			if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
+			ref_clk = !strcmp(clki->name, "ref_clk") ? true : false;
+			if (skip_ref_clk && ref_clk)
 				continue;
 
 			clk_state_changed = on ^ clki->enabled;
@@ -7449,6 +7452,9 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 				}
 			} else if (!on && clki->enabled) {
 				clk_disable_unprepare(clki->clk);
+				wait_us = hba->dev_info.clk_gating_wait_us;
+				if (ref_clk && wait_us)
+					usleep_range(wait_us, wait_us + 10);
 			}
 			clki->enabled = on;
 			dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
-- 
2.18.0
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

WARNING: multiple messages have this Message-ID (diff)
From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.petersen@oracle.com>,
	<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
	<jejb@linux.ibm.com>
Cc: Stanley Chu <stanley.chu@mediatek.com>,
	bvanassche@acm.org, 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 v1 1/2] scsi: ufs: add required delay after gating reference clock
Date: Mon, 17 Feb 2020 17:35:58 +0800	[thread overview]
Message-ID: <20200217093559.16830-2-stanley.chu@mediatek.com> (raw)
In-Reply-To: <20200217093559.16830-1-stanley.chu@mediatek.com>

In UFS version 3.0, a newly added attribute bRefClkGatingWaitTime defines
the minimum time for which the reference clock is required by device during
transition to LS-MODE or HIBERN8 state.

Currently this time is detected and stored in
hba->dev_info.clk_gating_wait_us but applied to vendor implementatios only.
Make it applied to reference clock named as "ref_clk" in device tree in
common path.

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
 drivers/scsi/ufs/ufshcd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 744b8254220c..7f60721f54d1 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7417,8 +7417,10 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 	struct ufs_clk_info *clki;
 	struct list_head *head = &hba->clk_list_head;
 	unsigned long flags;
+	unsigned long wait_us;
 	ktime_t start = ktime_get();
 	bool clk_state_changed = false;
+	bool ref_clk;
 
 	if (list_empty(head))
 		goto out;
@@ -7436,7 +7438,8 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 
 	list_for_each_entry(clki, head, list) {
 		if (!IS_ERR_OR_NULL(clki->clk)) {
-			if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
+			ref_clk = !strcmp(clki->name, "ref_clk") ? true : false;
+			if (skip_ref_clk && ref_clk)
 				continue;
 
 			clk_state_changed = on ^ clki->enabled;
@@ -7449,6 +7452,9 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
 				}
 			} else if (!on && clki->enabled) {
 				clk_disable_unprepare(clki->clk);
+				wait_us = hba->dev_info.clk_gating_wait_us;
+				if (ref_clk && wait_us)
+					usleep_range(wait_us, wait_us + 10);
 			}
 			clki->enabled = on;
 			dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
-- 
2.18.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-02-17  9:36 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-17  9:35 [PATCH v1 0/2] scsi: ufs: fix waiting time for reference clock Stanley Chu
2020-02-17  9:35 ` Stanley Chu
2020-02-17  9:35 ` Stanley Chu
2020-02-17  9:35 ` Stanley Chu [this message]
2020-02-17  9:35   ` [PATCH v1 1/2] scsi: ufs: add required delay after gating " Stanley Chu
2020-02-17  9:35   ` Stanley Chu
2020-02-17 12:58   ` Can Guo
2020-02-17 12:58     ` Can Guo
2020-02-17 12:58     ` Can Guo
2020-02-17 13:12     ` Stanley Chu
2020-02-17 13:12       ` Stanley Chu
2020-02-17 13:12       ` Stanley Chu
2020-02-17 13:22       ` Can Guo
2020-02-17 13:22         ` Can Guo
2020-02-17 13:22         ` Can Guo
2020-02-17 13:34         ` Stanley Chu
2020-02-17 13:34           ` Stanley Chu
2020-02-17 13:34           ` Stanley Chu
2020-02-17 13:42           ` Can Guo
2020-02-17 13:42             ` Can Guo
2020-02-17 13:42             ` Can Guo
2020-02-19  2:35             ` Can Guo
2020-02-19  2:35               ` Can Guo
2020-02-19  2:35               ` Can Guo
2020-02-19  9:11               ` Stanley Chu
2020-02-19  9:11                 ` Stanley Chu
2020-02-19  9:11                 ` Stanley Chu
2020-02-19 10:33                 ` Can Guo
2020-02-19 10:33                   ` Can Guo
2020-02-19 10:33                   ` Can Guo
2020-02-20 13:30                   ` Stanley Chu
2020-02-20 13:30                     ` Stanley Chu
2020-02-20 13:30                     ` Stanley Chu
2020-02-17 16:17   ` Bart Van Assche
2020-02-17 16:17     ` Bart Van Assche
2020-02-17 16:17     ` Bart Van Assche
2020-02-18  0:50     ` Stanley Chu
2020-02-18  0:50       ` Stanley Chu
2020-02-18  0:50       ` Stanley Chu
2020-02-17  9:35 ` [PATCH v1 2/2] scsi: ufs: ufs-mediatek: add waiting time for " Stanley Chu
2020-02-17  9:35   ` Stanley Chu
2020-02-17  9:35   ` Stanley Chu

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