[PATCH v4 01/11] usb: early: convert to readl_poll_timeout_atomic()

[PATCH v4 01/11] usb: early: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Jann Horn <jannh@google.com>
---
v4: add reviewed-by Jann

v2~v3: no changes
---
 drivers/usb/early/xhci-dbc.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/early/xhci-dbc.c b/drivers/usb/early/xhci-dbc.c
index c050776..be4ecba 100644
--- a/drivers/usb/early/xhci-dbc.c
+++ b/drivers/usb/early/xhci-dbc.c
@@ -14,6 +14,7 @@
 #include <linux/pci_ids.h>
 #include <linux/memblock.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <asm/pci-direct.h>
 #include <asm/fixmap.h>
 #include <linux/bcd.h>
@@ -135,16 +136,9 @@ static int handshake(void __iomem *ptr, u32 mask, u32 done, int wait, int delay)
 {
 	u32 result;
 
-	do {
-		result = readl(ptr);
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(delay);
-		wait -= delay;
-	} while (wait > 0);
-
-	return -ETIMEDOUT;
+	return readl_poll_timeout_atomic(ptr, result,
+					 ((result & mask) == done),
+					 delay, wait);
 }
 
 static void __init xdbc_bios_handoff(void)
-- 
1.9.1

[PATCH v4 02/11] usb: early: ehci-dbgp: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~v4: no changes
---
 drivers/usb/early/ehci-dbgp.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/early/ehci-dbgp.c b/drivers/usb/early/ehci-dbgp.c
index b075dbf..45b42d8 100644
--- a/drivers/usb/early/ehci-dbgp.c
+++ b/drivers/usb/early/ehci-dbgp.c
@@ -15,6 +15,7 @@
 #include <linux/console.h>
 #include <linux/errno.h>
 #include <linux/init.h>
+#include <linux/iopoll.h>
 #include <linux/pci_regs.h>
 #include <linux/pci_ids.h>
 #include <linux/usb/ch9.h>
@@ -161,17 +162,11 @@ static inline u32 dbgp_pid_read_update(u32 x, u32 tok)
 static int dbgp_wait_until_complete(void)
 {
 	u32 ctrl;
-	int loop = DBGP_TIMEOUT;
-
-	do {
-		ctrl = readl(&ehci_debug->control);
-		/* Stop when the transaction is finished */
-		if (ctrl & DBGP_DONE)
-			break;
-		udelay(1);
-	} while (--loop > 0);
+	int ret;
 
-	if (!loop)
+	ret = readl_poll_timeout_atomic(&ehci_debug->control, ctrl,
+				(ctrl & DBGP_DONE), 1, DBGP_TIMEOUT);
+	if (ret)
 		return -DBGP_TIMEOUT;
 
 	/*
-- 
1.9.1

[PATCH v4 03/11] usb: pci-quirks: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~v4: no changes
---
 drivers/usb/host/pci-quirks.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index b8961c0..8920566 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -16,6 +16,7 @@
 #include <linux/export.h>
 #include <linux/acpi.h>
 #include <linux/dmi.h>
+#include <linux/iopoll.h>
 
 #include <soc/bcm2835/raspberrypi-firmware.h>
 
@@ -1012,15 +1013,9 @@ static int handshake(void __iomem *ptr, u32 mask, u32 done,
 {
 	u32	result;
 
-	do {
-		result = readl(ptr);
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(delay_usec);
-		wait_usec -= delay_usec;
-	} while (wait_usec > 0);
-	return -ETIMEDOUT;
+	return readl_poll_timeout_atomic(ptr, result,
+					 ((result & mask) == done),
+					 delay_usec, wait_usec);
 }
 
 /*
-- 
1.9.1

[PATCH v4 04/11] usb: xhci-rcar: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v4: changes
    1. remove unnecessary parentheses suggested by Yoshihiro
    2. fix the wrong return value suggested by Yoshihiro & Daniel

v2~v3: no changes
---
 drivers/usb/host/xhci-rcar.c | 43 ++++++++++++-------------------------------
 1 file changed, 12 insertions(+), 31 deletions(-)

diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
index c1025d3..1bc4fe7 100644
--- a/drivers/usb/host/xhci-rcar.c
+++ b/drivers/usb/host/xhci-rcar.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/firmware.h>
+#include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
@@ -127,8 +128,7 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 	void __iomem *regs = hcd->regs;
 	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
 	const struct firmware *fw;
-	int retval, index, j, time;
-	int timeout = 10000;
+	int retval, index, j;
 	u32 data, val, temp;
 	u32 quirks = 0;
 	const struct soc_device_attribute *attr;
@@ -166,32 +166,19 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 		temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
 		writel(temp, regs + RCAR_USB3_DL_CTRL);
 
-		for (time = 0; time < timeout; time++) {
-			val = readl(regs + RCAR_USB3_DL_CTRL);
-			if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
-				break;
-			udelay(1);
-		}
-		if (time == timeout) {
-			retval = -ETIMEDOUT;
+		retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,
+				val, !(val & RCAR_USB3_DL_CTRL_FW_SET_DATA0),
+				1, 10000);
+		if (retval < 0)
 			break;
-		}
 	}
 
 	temp = readl(regs + RCAR_USB3_DL_CTRL);
 	temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
 	writel(temp, regs + RCAR_USB3_DL_CTRL);
 
-	for (time = 0; time < timeout; time++) {
-		val = readl(regs + RCAR_USB3_DL_CTRL);
-		if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
-			retval = 0;
-			break;
-		}
-		udelay(1);
-	}
-	if (time == timeout)
-		retval = -ETIMEDOUT;
+	retval = readl_poll_timeout_atomic((regs + RCAR_USB3_DL_CTRL),
+			val, val & RCAR_USB3_DL_CTRL_FW_SUCCESS, 1, 10000);
 
 	release_firmware(fw);
 
@@ -200,18 +187,12 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 
 static bool xhci_rcar_wait_for_pll_active(struct usb_hcd *hcd)
 {
-	int timeout = 1000;
+	int retval;
 	u32 val, mask = RCAR_USB3_AXH_STA_PLL_ACTIVE_MASK;
 
-	while (timeout > 0) {
-		val = readl(hcd->regs + RCAR_USB3_AXH_STA);
-		if ((val & mask) == mask)
-			return true;
-		udelay(1);
-		timeout--;
-	}
-
-	return false;
+	retval = readl_poll_timeout_atomic(hcd->regs + RCAR_USB3_AXH_STA,
+			val, (val & mask) == mask, 1, 1000);
+	return !retval;
 }
 
 /* This function needs to initialize a "phy" of usb before */
-- 
1.9.1

[PATCH v4 05/11] usb: oxu210hp-hcd: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~v4: no changes
---
 drivers/usb/host/oxu210hp-hcd.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/oxu210hp-hcd.c b/drivers/usb/host/oxu210hp-hcd.c
index cfa7dd2..27dbbe1 100644
--- a/drivers/usb/host/oxu210hp-hcd.c
+++ b/drivers/usb/host/oxu210hp-hcd.c
@@ -24,6 +24,7 @@
 #include <linux/moduleparam.h>
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 
 #include <asm/irq.h>
 #include <asm/unaligned.h>
@@ -748,18 +749,16 @@ static int handshake(struct oxu_hcd *oxu, void __iomem *ptr,
 					u32 mask, u32 done, int usec)
 {
 	u32 result;
+	int ret;
 
-	do {
-		result = readl(ptr);
-		if (result == ~(u32)0)		/* card removed */
-			return -ENODEV;
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(1);
-		usec--;
-	} while (usec > 0);
-	return -ETIMEDOUT;
+	ret = readl_poll_timeout_atomic(ptr, result,
+					((result & mask) == done ||
+					 result == U32_MAX),
+					1, usec);
+	if (result == U32_MAX)		/* card removed */
+		return -ENODEV;
+
+	return ret;
 }
 
 /* Force HC to halt state from unknown (EHCI spec section 2.3) */
-- 
1.9.1

[PATCH v4 06/11] usb: fotg210-hcd: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~v4: no changes
---
 drivers/usb/host/fotg210-hcd.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c
index 194df82..1d94fcf 100644
--- a/drivers/usb/host/fotg210-hcd.c
+++ b/drivers/usb/host/fotg210-hcd.c
@@ -32,6 +32,7 @@
 #include <linux/uaccess.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/clk.h>
 
 #include <asm/byteorder.h>
@@ -883,18 +884,15 @@ static int handshake(struct fotg210_hcd *fotg210, void __iomem *ptr,
 		u32 mask, u32 done, int usec)
 {
 	u32 result;
+	int ret;
 
-	do {
-		result = fotg210_readl(fotg210, ptr);
-		if (result == ~(u32)0)		/* card removed */
-			return -ENODEV;
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(1);
-		usec--;
-	} while (usec > 0);
-	return -ETIMEDOUT;
+	ret = readl_poll_timeout_atomic(ptr, result,
+					((result & mask) == done ||
+					 result == U32_MAX), 1, usec);
+	if (result == U32_MAX)		/* card removed */
+		return -ENODEV;
+
+	return ret;
 }
 
 /* Force HC to halt state from unknown (EHCI spec section 2.3).
-- 
1.9.1

[PATCH v4 07/11] usb: isp1760-hcd: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~v4: no changes
---
 drivers/usb/isp1760/isp1760-hcd.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/isp1760/isp1760-hcd.c b/drivers/usb/isp1760/isp1760-hcd.c
index dd74ab7a..33ae656 100644
--- a/drivers/usb/isp1760/isp1760-hcd.c
+++ b/drivers/usb/isp1760/isp1760-hcd.c
@@ -22,6 +22,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/mm.h>
 #include <linux/timer.h>
 #include <asm/unaligned.h>
@@ -380,18 +381,15 @@ static int handshake(struct usb_hcd *hcd, u32 reg,
 		      u32 mask, u32 done, int usec)
 {
 	u32 result;
+	int ret;
+
+	ret = readl_poll_timeout_atomic(hcd->regs + reg, result,
+					((result & mask) == done ||
+					 result == U32_MAX), 1, usec);
+	if (result == U32_MAX)
+		return -ENODEV;
 
-	do {
-		result = reg_read32(hcd->regs, reg);
-		if (result == ~0)
-			return -ENODEV;
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(1);
-		usec--;
-	} while (usec > 0);
-	return -ETIMEDOUT;
+	return ret;
 }
 
 /* reset a non-running (STS_HALT == 1) controller */
-- 
1.9.1

[PATCH v4 08/11] usb: phy-ulpi-viewport: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~v4: no changes
---
 drivers/usb/phy/phy-ulpi-viewport.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/phy/phy-ulpi-viewport.c b/drivers/usb/phy/phy-ulpi-viewport.c
index 7a14e0e..0f61e32 100644
--- a/drivers/usb/phy/phy-ulpi-viewport.c
+++ b/drivers/usb/phy/phy-ulpi-viewport.c
@@ -7,6 +7,7 @@
 #include <linux/kernel.h>
 #include <linux/usb.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/ulpi.h>
 
@@ -20,16 +21,9 @@
 
 static int ulpi_viewport_wait(void __iomem *view, u32 mask)
 {
-	unsigned long usec = 2000;
+	u32 val;
 
-	while (usec--) {
-		if (!(readl(view) & mask))
-			return 0;
-
-		udelay(1);
-	}
-
-	return -ETIMEDOUT;
+	return readl_poll_timeout_atomic(view, val, !(val & mask), 1, 2000);
 }
 
 static int ulpi_viewport_read(struct usb_phy *otg, u32 reg)
-- 
1.9.1

[PATCH v4 09/11] usb: phy: phy-mv-usb: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v4: no changes

v3: re-align argument of log suggested by Sergei

v2: udelay 10us instead of 20us according to kerneldoc
---
 drivers/usb/phy/phy-mv-usb.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/phy/phy-mv-usb.c b/drivers/usb/phy/phy-mv-usb.c
index ce767ec..576d925 100644
--- a/drivers/usb/phy/phy-mv-usb.c
+++ b/drivers/usb/phy/phy-mv-usb.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/uaccess.h>
 #include <linux/device.h>
 #include <linux/proc_fs.h>
@@ -135,8 +136,8 @@ static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
 
 static int mv_otg_reset(struct mv_otg *mvotg)
 {
-	unsigned int loops;
 	u32 tmp;
+	int ret;
 
 	/* Stop the controller */
 	tmp = readl(&mvotg->op_regs->usbcmd);
@@ -146,15 +147,12 @@ static int mv_otg_reset(struct mv_otg *mvotg)
 	/* Reset the controller to get default values */
 	writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
 
-	loops = 500;
-	while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
-		if (loops == 0) {
-			dev_err(&mvotg->pdev->dev,
-				"Wait for RESET completed TIMEOUT\n");
-			return -ETIMEDOUT;
-		}
-		loops--;
-		udelay(20);
+	ret = readl_poll_timeout_atomic(&mvotg->op_regs->usbcmd, tmp,
+				(tmp & USBCMD_CTRL_RESET), 10, 10000);
+	if (ret < 0) {
+		dev_err(&mvotg->pdev->dev,
+			"Wait for RESET completed TIMEOUT\n");
+		return ret;
 	}
 
 	writel(0x0, &mvotg->op_regs->usbintr);
-- 
1.9.1

[PATCH v4 10/11] usb: udc: net2280: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
---
v3~v4: no changes

v2: add Acked-by Alan
---
 drivers/usb/gadget/udc/net2280.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index 7530bd9..f1a21f4 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -52,6 +52,7 @@
 #include <linux/usb/gadget.h>
 #include <linux/prefetch.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 
 #include <asm/byteorder.h>
 #include <asm/irq.h>
@@ -360,18 +361,16 @@ static inline void enable_pciirqenb(struct net2280_ep *ep)
 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 {
 	u32	result;
+	int	ret;
 
-	do {
-		result = readl(ptr);
-		if (result == ~(u32)0)		/* "device unplugged" */
-			return -ENODEV;
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(1);
-		usec--;
-	} while (usec > 0);
-	return -ETIMEDOUT;
+	ret = readl_poll_timeout_atomic(ptr, result,
+					((result & mask) == done ||
+					 result == U32_MAX),
+					1, usec);
+	if (result == U32_MAX)		/* device unplugged */
+		return -ENODEV;
+
+	return ret;
 }
 
 static const struct usb_ep_ops net2280_ep_ops;
-- 
1.9.1

[PATCH v4 11/11] iopoll: update kerneldoc of read_poll_timeout_atomic()

[Chunfeng Yun]

Arguments description of read_poll_timeout_atomic() is out of date,
update it.

Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v4: no changes

v3: fix typo in commit message suggested by Sergei

v2: new patch, suggested by Alan
---
 include/linux/iopoll.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index bc89ac6..2c8860e 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -60,8 +60,7 @@
 /**
  * read_poll_timeout_atomic - Periodically poll an address until a condition is
  * 				met or a timeout occurs
- * @op: accessor function (takes @addr as its only argument)
- * @addr: Address to poll
+ * @op: accessor function (takes @args as its arguments)
  * @val: Variable to read the value into
  * @cond: Break condition (usually involving @val)
  * @delay_us: Time to udelay between reads in us (0 tight-loops).  Should
@@ -69,6 +68,7 @@
  *            Documentation/timers/timers-howto.rst).
  * @timeout_us: Timeout in us, 0 means never timeout
  * @delay_before_read: if it is true, delay @delay_us before read.
+ * @args: arguments for @op poll
  *
  * Returns 0 on success and -ETIMEDOUT upon a timeout. In either
  * case, the last read value at @args is stored in @val.
-- 
1.9.1

RE: [PATCH v4 04/11] usb: xhci-rcar: convert to readl_poll_timeout_atomic()

[Yoshihiro Shimoda]

Hi Chungeng,

Thank you for the patch!

> From: Chunfeng Yun, Sent: Monday, September 21, 2020 3:13 PM
> 
> Use readl_poll_timeout_atomic() to simplify code
> 
> Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v4: changes
>     1. remove unnecessary parentheses suggested by Yoshihiro
>     2. fix the wrong return value suggested by Yoshihiro & Daniel
> 
> v2~v3: no changes
> ---
>  drivers/usb/host/xhci-rcar.c | 43 ++++++++++++-------------------------------
>  1 file changed, 12 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
> index c1025d3..1bc4fe7 100644
> --- a/drivers/usb/host/xhci-rcar.c
> +++ b/drivers/usb/host/xhci-rcar.c
> @@ -6,6 +6,7 @@
>   */
> 
>  #include <linux/firmware.h>
> +#include <linux/iopoll.h>
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
>  #include <linux/of.h>
> @@ -127,8 +128,7 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
>  	void __iomem *regs = hcd->regs;
>  	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
>  	const struct firmware *fw;
> -	int retval, index, j, time;
> -	int timeout = 10000;
> +	int retval, index, j;
>  	u32 data, val, temp;
>  	u32 quirks = 0;
>  	const struct soc_device_attribute *attr;
> @@ -166,32 +166,19 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
>  		temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
>  		writel(temp, regs + RCAR_USB3_DL_CTRL);
> 
> -		for (time = 0; time < timeout; time++) {
> -			val = readl(regs + RCAR_USB3_DL_CTRL);
> -			if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
> -				break;
> -			udelay(1);
> -		}
> -		if (time == timeout) {
> -			retval = -ETIMEDOUT;
> +		retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,
> +				val, !(val & RCAR_USB3_DL_CTRL_FW_SET_DATA0),
> +				1, 10000);
> +		if (retval < 0)
>  			break;
> -		}
>  	}
> 
>  	temp = readl(regs + RCAR_USB3_DL_CTRL);
>  	temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
>  	writel(temp, regs + RCAR_USB3_DL_CTRL);
> 
> -	for (time = 0; time < timeout; time++) {
> -		val = readl(regs + RCAR_USB3_DL_CTRL);
> -		if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
> -			retval = 0;
> -			break;
> -		}
> -		udelay(1);
> -	}
> -	if (time == timeout)
> -		retval = -ETIMEDOUT;
> +	retval = readl_poll_timeout_atomic((regs + RCAR_USB3_DL_CTRL),

We can also remove these unnecessary parentheses like below.

+	retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,

After fixed this:

Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Best regards,
Yoshihiro Shimoda

Re: [PATCH v4 04/11] usb: xhci-rcar: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

On Wed, 2020-09-23 at 08:47 +0000, Yoshihiro Shimoda wrote:
> Hi Chungeng,
> 
> Thank you for the patch!
> 
> > From: Chunfeng Yun, Sent: Monday, September 21, 2020 3:13 PM
> > 
> > Use readl_poll_timeout_atomic() to simplify code
> > 
> > Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
> > Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> > ---
> > v4: changes
> >     1. remove unnecessary parentheses suggested by Yoshihiro
> >     2. fix the wrong return value suggested by Yoshihiro & Daniel
> > 
> > v2~v3: no changes
> > ---
> >  drivers/usb/host/xhci-rcar.c | 43 ++++++++++++-------------------------------
> >  1 file changed, 12 insertions(+), 31 deletions(-)
> > 
> > diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
> > index c1025d3..1bc4fe7 100644
> > --- a/drivers/usb/host/xhci-rcar.c
> > +++ b/drivers/usb/host/xhci-rcar.c
> > @@ -6,6 +6,7 @@
> >   */
> > 
> >  #include <linux/firmware.h>
> > +#include <linux/iopoll.h>
> >  #include <linux/module.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/of.h>
> > @@ -127,8 +128,7 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
> >  	void __iomem *regs = hcd->regs;
> >  	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
> >  	const struct firmware *fw;
> > -	int retval, index, j, time;
> > -	int timeout = 10000;
> > +	int retval, index, j;
> >  	u32 data, val, temp;
> >  	u32 quirks = 0;
> >  	const struct soc_device_attribute *attr;
> > @@ -166,32 +166,19 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
> >  		temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
> >  		writel(temp, regs + RCAR_USB3_DL_CTRL);
> > 
> > -		for (time = 0; time < timeout; time++) {
> > -			val = readl(regs + RCAR_USB3_DL_CTRL);
> > -			if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
> > -				break;
> > -			udelay(1);
> > -		}
> > -		if (time == timeout) {
> > -			retval = -ETIMEDOUT;
> > +		retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,
> > +				val, !(val & RCAR_USB3_DL_CTRL_FW_SET_DATA0),
> > +				1, 10000);
> > +		if (retval < 0)
> >  			break;
> > -		}
> >  	}
> > 
> >  	temp = readl(regs + RCAR_USB3_DL_CTRL);
> >  	temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
> >  	writel(temp, regs + RCAR_USB3_DL_CTRL);
> > 
> > -	for (time = 0; time < timeout; time++) {
> > -		val = readl(regs + RCAR_USB3_DL_CTRL);
> > -		if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
> > -			retval = 0;
> > -			break;
> > -		}
> > -		udelay(1);
> > -	}
> > -	if (time == timeout)
> > -		retval = -ETIMEDOUT;
> > +	retval = readl_poll_timeout_atomic((regs + RCAR_USB3_DL_CTRL),
> 
> We can also remove these unnecessary parentheses like below.
Ok, will remove it, thanks a lot

> 
> +	retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,
> 
> After fixed this:
> 
> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> 
> Best regards,
> Yoshihiro Shimoda
>