[PATCH net-next v7 00/10] introduce read_poll_timeout

[PATCH net-next v7 00/10] introduce read_poll_timeout

[Dejin Zheng]

This patch sets is introduce read_poll_timeout macro, it is an extension
of readx_poll_timeout macro. the accessor function op just supports only
one parameter in the readx_poll_timeout macro, but this macro can
supports multiple variable parameters for it. so functions like
phy_read(struct phy_device *phydev, u32 regnum) and
phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum) can
use this poll timeout framework.

the first patch introduce read_poll_timeout macro, and the second patch
redefined readx_poll_timeout macro by read_poll_timeout(), and the other
patches are examples using read_poll_timeout macro.

v6 -> v7:
	- add a parameter to supports that it can sleep some time
	  before read operation in read_poll_timeout macro.
	- add prefix with double underscores for some variable to avoid
	  any variable re-declaration or shadowing in patch 3 and patch
	  7.
v5 -> v6:
	- add some check to keep the code more similar in patch 8
v4 -> v5:
	- add some msleep() before call phy_read_mmd_poll_timeout() to
	  keep the code more similar in patch 6 and patch 9.
	- add a patch of drop by v4, it can add msleep before call
	  phy_read_poll_timeout() to keep the code more similar.
v3 -> v4:
	- add 3 examples of using new functions.
	- deal with precedence issues for parameter cond.
	- drop a patch about phy_poll_reset() function.
v2 -> v3:
	- modify the parameter order of newly added functions.
	  phy_read_mmd_poll_timeout(val, cond, sleep_us, timeout_us, \
				     phydev, devaddr, regnum)
				||
				\/
	  phy_read_mmd_poll_timeout(phydev, devaddr regnum, val, cond, \
				    sleep_us, timeout_us)

	  phy_read_poll_timeout(val, cond, sleep_us, timeout_us, \
				phydev, regnum)
				||
				\/
	  phy_read_poll_timeout(phydev, regnum, val, cond, sleep_us, \
				timeout_us)
v1 -> v2:
	- passed a phydev, device address and a reg to replace args...
	  parameter in phy_read_mmd_poll_timeout() by Andrew Lunn 's
	  suggestion in patch 3. Andrew Lunn <andrew@lunn.ch>, Thanks
	  very much for your help!
	- also in patch 3, handle phy_read_mmd return an error(the return
	  value < 0) in phy_read_mmd_poll_timeout(). Thanks Andrew
	  again.
	- in patch 6, pass a phydev and a reg to replace args...
	  parameter in phy_read_poll_timeout(), and also handle the
	  phy_read() function's return error.

Dejin Zheng (10):
  iopoll: introduce read_poll_timeout macro
  iopoll: redefined readx_poll_timeout macro to simplify the code
  net: phy: introduce phy_read_mmd_poll_timeout macro
  net: phy: bcm84881: use phy_read_mmd_poll_timeout() to simplify the
    code
  net: phy: aquantia: use phy_read_mmd_poll_timeout() to simplify the
    code
  net: phy: marvell10g: use phy_read_mmd_poll_timeout() to simplify the
    code
  net: phy: introduce phy_read_poll_timeout macro
  net: phy: use phy_read_poll_timeout() to simplify the code
  net: phy: smsc: use phy_read_poll_timeout() to simplify the code
  net: phy: tja11xx: use phy_read_poll_timeout() to simplify the code

 drivers/net/phy/aquantia_main.c | 13 ++++-------
 drivers/net/phy/bcm84881.c      | 27 ++++------------------
 drivers/net/phy/marvell10g.c    | 15 +++++--------
 drivers/net/phy/nxp-tja11xx.c   | 16 +++----------
 drivers/net/phy/phy_device.c    | 16 +++++--------
 drivers/net/phy/smsc.c          | 16 +++++--------
 include/linux/iopoll.h          | 40 +++++++++++++++++++++++++++------
 include/linux/phy.h             | 27 ++++++++++++++++++++++
 8 files changed, 86 insertions(+), 84 deletions(-)

-- 
2.25.0

[PATCH net-next v7 01/10] iopoll: introduce read_poll_timeout macro

[Dejin Zheng]

this macro is an extension of readx_poll_timeout macro. the accessor
function op just supports only one parameter in the readx_poll_timeout
macro, but this macro can supports multiple variable parameters for
it. so functions like phy_read(struct phy_device *phydev, u32 regnum)
and phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum) can
also use this poll timeout core. and also expand it can sleep some time
before read operation.

Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- add a parameter sleep_before_read to support that it can sleep
	  some time before read operation in read_poll_timeout macro.
v5 -> v6:
	- no changed
v4 -> v5:
	- no changed
v3 -> v4:
	- no changed
v2 -> v3:
	- no changed
v1 -> v2:
	- no changed

 include/linux/iopoll.h | 44 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index 35e15dfd4155..70f89b389648 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -13,6 +13,50 @@
 #include <linux/errno.h>
 #include <linux/io.h>
 
+/**
+ * read_poll_timeout - Periodically poll an address until a condition is
+ *			met or a timeout occurs
+ * @op: accessor function (takes @args as its arguments)
+ * @val: Variable to read the value into
+ * @cond: Break condition (usually involving @val)
+ * @sleep_us: Maximum time to sleep between reads in us (0
+ *            tight-loops).  Should be less than ~20ms since usleep_range
+ *            is used (see Documentation/timers/timers-howto.rst).
+ * @timeout_us: Timeout in us, 0 means never timeout
+ * @sleep_before_read: if it is true, sleep @sleep_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. Must not
+ * be called from atomic context if sleep_us or timeout_us are used.
+ *
+ * When available, you'll probably want to use one of the specialized
+ * macros defined below rather than this macro directly.
+ */
+#define read_poll_timeout(op, val, cond, sleep_us, timeout_us, \
+				sleep_before_read, args...) \
+({ \
+	u64 __timeout_us = (timeout_us); \
+	unsigned long __sleep_us = (sleep_us); \
+	ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \
+	might_sleep_if((__sleep_us) != 0); \
+	if (sleep_before_read && __sleep_us) \
+		usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
+	for (;;) { \
+		(val) = op(args); \
+		if (cond) \
+			break; \
+		if (__timeout_us && \
+		    ktime_compare(ktime_get(), __timeout) > 0) { \
+			(val) = op(args); \
+			break; \
+		} \
+		if (__sleep_us) \
+			usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
+	} \
+	(cond) ? 0 : -ETIMEDOUT; \
+})
+
 /**
  * readx_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
  * @op: accessor function (takes @addr as its only argument)
-- 
2.25.0

[PATCH net-next v7 02/10] iopoll: redefined readx_poll_timeout macro to simplify the code

[Dejin Zheng]

redefined readx_poll_timeout macro by read_poll_timeout to
simplify the code.

Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
v5 -> v6:
	- no changed
v4 -> v5:
	- no changed
v3 -> v4:
	- no changed
v2 -> v3:
	- no changed
v1 -> v2:
	- no changed

 include/linux/iopoll.h | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index 70f89b389648..cb20c733b15a 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -76,25 +76,7 @@
  * macros defined below rather than this macro directly.
  */
 #define readx_poll_timeout(op, addr, val, cond, sleep_us, timeout_us)	\
-({ \
-	u64 __timeout_us = (timeout_us); \
-	unsigned long __sleep_us = (sleep_us); \
-	ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \
-	might_sleep_if((__sleep_us) != 0); \
-	for (;;) { \
-		(val) = op(addr); \
-		if (cond) \
-			break; \
-		if (__timeout_us && \
-		    ktime_compare(ktime_get(), __timeout) > 0) { \
-			(val) = op(addr); \
-			break; \
-		} \
-		if (__sleep_us) \
-			usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
-	} \
-	(cond) ? 0 : -ETIMEDOUT; \
-})
+	read_poll_timeout(op, val, cond, sleep_us, timeout_us, false, addr)
 
 /**
  * readx_poll_timeout_atomic - Periodically poll an address until a condition is met or a timeout occurs
-- 
2.25.0

[PATCH net-next v7 03/10] net: phy: introduce phy_read_mmd_poll_timeout macro

[Dejin Zheng]

it is sometimes necessary to poll a phy register by phy_read_mmd()
function until its value satisfies some condition. introduce
phy_read_mmd_poll_timeout() macros that do this.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
	- add prefix with double underscores for the variable ret to avoid
	  any variable re-declaration or shadowing.
v5 -> v6:
	- no changed
v4 -> v5:
	- no changed
v3 -> v4:
	- deal with precedence issues for parameter cond.
v2 -> v3:
	- modify the parameter order of newly added functions.
	  phy_read_mmd_poll_timeout(val, cond, sleep_us, timeout_us, \
				     phydev, devaddr, regnum)
				||
				\/
	  phy_read_mmd_poll_timeout(phydev, devaddr regnum, val, cond, \
				    sleep_us, timeout_us)
v1 -> v2:
	- passed a phydev, device address and a reg to replace args...
	  parameter in phy_read_mmd_poll_timeout() by Andrew Lunn 's
	  suggestion. Andrew Lunn <andrew@lunn.ch>, Thanks very much for
	  your help!
	- handle phy_read_mmd return an error(the return value < 0) in
	  phy_read_mmd_poll_timeout(). Thanks Andrew again.

 include/linux/phy.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 36d9dea04016..c172747b4ab2 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -24,6 +24,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/u64_stats_sync.h>
 #include <linux/irqreturn.h>
+#include <linux/iopoll.h>
 
 #include <linux/atomic.h>
 
@@ -784,6 +785,19 @@ static inline int __phy_modify_changed(struct phy_device *phydev, u32 regnum,
  */
 int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum);
 
+#define phy_read_mmd_poll_timeout(phydev, devaddr, regnum, val, cond, \
+				  sleep_us, timeout_us, sleep_before_read) \
+({ \
+	int __ret = read_poll_timeout(phy_read_mmd, val, (cond) || val < 0, \
+				  sleep_us, timeout_us, sleep_before_read, \
+				  phydev, devaddr, regnum); \
+	if (val <  0) \
+		__ret = val; \
+	if (__ret) \
+		phydev_err(phydev, "%s failed: %d\n", __func__, __ret); \
+	__ret; \
+})
+
 /**
  * __phy_read_mmd - Convenience function for reading a register
  * from an MMD on a given PHY.
-- 
2.25.0

[PATCH net-next v7 04/10] net: phy: bcm84881: use phy_read_mmd_poll_timeout() to simplify the code

[Dejin Zheng]

use phy_read_mmd_poll_timeout() to replace the poll codes for
simplify bcm84881_wait_init() function.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
v5 -> v6:
	- no changed
v4 -> v5:
	- no changed
v3 -> v4:
	- no changed
v2 -> v3:
	- adapt to it after modifying the parameter order of the
	  newly added function
v1 -> v2:
	- remove the handle of phy_read_mmd's return error.

 drivers/net/phy/bcm84881.c | 27 ++++-----------------------
 1 file changed, 4 insertions(+), 23 deletions(-)

diff --git a/drivers/net/phy/bcm84881.c b/drivers/net/phy/bcm84881.c
index 14d55a77eb28..3840d2adbbb9 100644
--- a/drivers/net/phy/bcm84881.c
+++ b/drivers/net/phy/bcm84881.c
@@ -22,30 +22,11 @@ enum {
 
 static int bcm84881_wait_init(struct phy_device *phydev)
 {
-	unsigned int tries = 20;
-	int ret, val;
-
-	do {
-		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
-		if (val < 0) {
-			ret = val;
-			break;
-		}
-		if (!(val & MDIO_CTRL1_RESET)) {
-			ret = 0;
-			break;
-		}
-		if (!--tries) {
-			ret = -ETIMEDOUT;
-			break;
-		}
-		msleep(100);
-	} while (1);
+	int val;
 
-	if (ret)
-		phydev_err(phydev, "%s failed: %d\n", __func__, ret);
-
-	return ret;
+	return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
+					 val, !(val & MDIO_CTRL1_RESET),
+					 100000, 2000000, false);
 }
 
 static int bcm84881_config_init(struct phy_device *phydev)
-- 
2.25.0

[PATCH net-next v7 05/10] net: phy: aquantia: use phy_read_mmd_poll_timeout() to simplify the code

[Dejin Zheng]

use phy_read_mmd_poll_timeout() to replace the poll codes for
simplify aqr107_wait_reset_complete() function.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
v5 -> v6:
	- no changed
v4 -> v5:
	- no changed
v3 -> v4:
	- no changed
v2 -> v3:
	- adapt to it after modifying the parameter order of the
	  newly added function
v1 -> v2:
	- remove the handle of phy_read_mmd's return error.


 drivers/net/phy/aquantia_main.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/phy/aquantia_main.c b/drivers/net/phy/aquantia_main.c
index 31927b2c7d5a..d6829839ba60 100644
--- a/drivers/net/phy/aquantia_main.c
+++ b/drivers/net/phy/aquantia_main.c
@@ -451,16 +451,11 @@ static int aqr107_set_tunable(struct phy_device *phydev,
  */
 static int aqr107_wait_reset_complete(struct phy_device *phydev)
 {
-	int val, retries = 100;
-
-	do {
-		val = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_GLOBAL_FW_ID);
-		if (val < 0)
-			return val;
-		msleep(20);
-	} while (!val && --retries);
+	int val;
 
-	return val ? 0 : -ETIMEDOUT;
+	return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
+					 VEND1_GLOBAL_FW_ID, val, val != 0,
+					 20000, 2000000, false);
 }
 
 static void aqr107_chip_info(struct phy_device *phydev)
-- 
2.25.0

[PATCH net-next v7 06/10] net: phy: marvell10g: use phy_read_mmd_poll_timeout() to simplify the code

[Dejin Zheng]

use phy_read_mmd_poll_timeout() to replace the poll codes for
simplify mv3310_reset() function.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
v5 -> v6:
	- no changed.
v4 -> v5:
	- add msleep() to before call phy_read_mmd_poll_timeout()
	  to keep the code more similar.
v3 -> v4:
	- add this patch by Andrew's suggestion. Thanks Andrew!


 drivers/net/phy/marvell10g.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 7e05b92504f0..7621badae64d 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -241,22 +241,17 @@ static int mv3310_power_up(struct phy_device *phydev)
 
 static int mv3310_reset(struct phy_device *phydev, u32 unit)
 {
-	int retries, val, err;
+	int val, err;
 
 	err = phy_modify_mmd(phydev, MDIO_MMD_PCS, unit + MDIO_CTRL1,
 			     MDIO_CTRL1_RESET, MDIO_CTRL1_RESET);
 	if (err < 0)
 		return err;
 
-	retries = 20;
-	do {
-		msleep(5);
-		val = phy_read_mmd(phydev, MDIO_MMD_PCS, unit + MDIO_CTRL1);
-		if (val < 0)
-			return val;
-	} while (val & MDIO_CTRL1_RESET && --retries);
-
-	return val & MDIO_CTRL1_RESET ? -ETIMEDOUT : 0;
+	return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PCS,
+					 unit + MDIO_CTRL1, val,
+					 !(val & MDIO_CTRL1_RESET),
+					 5000, 100000, true);
 }
 
 static int mv3310_get_edpd(struct phy_device *phydev, u16 *edpd)
-- 
2.25.0

[PATCH net-next v7 07/10] net: phy: introduce phy_read_poll_timeout macro

[Dejin Zheng]

it is sometimes necessary to poll a phy register by phy_read()
function until its value satisfies some condition. introduce
phy_read_poll_timeout() macros that do this.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
	- add prefix with double underscores for the variable ret to avoid
	  any variable re-declaration or shadowing.
v5 -> v6:
	- no changed.
v4 -> v5:
	- no changed.
v3 -> v4:
	- deal with precedence issues for parameter cond.
v2 -> v3:
	- modify the parameter order of newly added functions.
	  phy_read_poll_timeout(val, cond, sleep_us, timeout_us, \
				phydev, regnum)
				||
				\/
	  phy_read_poll_timeout(phydev, regnum, val, cond, sleep_us, \
				timeout_us)
v1 -> v2:
	- pass a phydev and a regnum to replace args... parameter in
	  the phy_read_poll_timeout(), and also handle the
	  phy_read() function's return error.
 
 include/linux/phy.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index c172747b4ab2..4f5b9dbc551d 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -714,6 +714,19 @@ static inline int phy_read(struct phy_device *phydev, u32 regnum)
 	return mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, regnum);
 }
 
+#define phy_read_poll_timeout(phydev, regnum, val, cond, sleep_us, \
+				timeout_us, sleep_before_read) \
+({ \
+	int __ret = read_poll_timeout(phy_read, val, (cond) || val < 0, \
+		sleep_us, timeout_us, sleep_before_read, phydev, regnum); \
+	if (val <  0) \
+		__ret = val; \
+	if (__ret) \
+		phydev_err(phydev, "%s failed: %d\n", __func__, __ret); \
+	__ret; \
+})
+
+
 /**
  * __phy_read - convenience function for reading a given PHY register
  * @phydev: the phy_device struct
-- 
2.25.0

[PATCH net-next v7 08/10] net: phy: use phy_read_poll_timeout() to simplify the code

[Dejin Zheng]

use phy_read_poll_timeout() to replace the poll codes for
simplify the code in phy_poll_reset() function.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
v5 -> v6:
	- add some check for keep the code more similar.
v4 -> v5:
	- it can add msleep before call phy_read_poll_timeout()
	  to keep the code more similar. so add it.
v3 -> v4:
	- drop it.
v2 -> v3:
	- adapt to it after modifying the parameter order of the
	  newly added function
v1 -> v2:
	- remove the handle of phy_read()'s return error.

 drivers/net/phy/phy_device.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index a585faf8b844..3b8f6b0b47b5 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1059,18 +1059,12 @@ EXPORT_SYMBOL(phy_disconnect);
 static int phy_poll_reset(struct phy_device *phydev)
 {
 	/* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
-	unsigned int retries = 12;
-	int ret;
-
-	do {
-		msleep(50);
-		ret = phy_read(phydev, MII_BMCR);
-		if (ret < 0)
-			return ret;
-	} while (ret & BMCR_RESET && --retries);
-	if (ret & BMCR_RESET)
-		return -ETIMEDOUT;
+	int ret, val;
 
+	ret = phy_read_poll_timeout(phydev, MII_BMCR, val, !(val & BMCR_RESET),
+				    50000, 600000, true);
+	if (ret)
+		return ret;
 	/* Some chips (smsc911x) may still need up to another 1ms after the
 	 * BMCR_RESET bit is cleared before they are usable.
 	 */
-- 
2.25.0

[PATCH net-next v7 09/10] net: phy: smsc: use phy_read_poll_timeout() to simplify the code

[Dejin Zheng]

use phy_read_poll_timeout() to replace the poll codes for
simplify lan87xx_read_status() function.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
v5 -> v6:
	- no changed.
v4 -> v5:
	- add msleep before phy_read_poll_timeout() to keep the
	  code more similar
v3 -> v4:
	- add this patch by Andrew's suggestion. Thanks Andrew!

 drivers/net/phy/smsc.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index b73298250793..93da7d3d0954 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -112,8 +112,6 @@ static int lan87xx_read_status(struct phy_device *phydev)
 	int err = genphy_read_status(phydev);
 
 	if (!phydev->link && priv->energy_enable) {
-		int i;
-
 		/* Disable EDPD to wake up PHY */
 		int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 		if (rc < 0)
@@ -125,15 +123,11 @@ static int lan87xx_read_status(struct phy_device *phydev)
 			return rc;
 
 		/* Wait max 640 ms to detect energy */
-		for (i = 0; i < 64; i++) {
-			/* Sleep to allow link test pulses to be sent */
-			msleep(10);
-			rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
-			if (rc < 0)
-				return rc;
-			if (rc & MII_LAN83C185_ENERGYON)
-				break;
-		}
+		phy_read_poll_timeout(phydev, MII_LAN83C185_CTRL_STATUS, rc,
+				      rc & MII_LAN83C185_ENERGYON, 10000,
+				      640000, true);
+		if (rc < 0)
+			return rc;
 
 		/* Re-enable EDPD */
 		rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
-- 
2.25.0

Re: [PATCH net-next v7 09/10] net: phy: smsc: use phy_read_poll_timeout() to simplify the code

[Kevin Groeneveld]

Resent as plain text this time.  Sorry to those that got this twice.

On Mon, Mar 23, 2020 at 11:10 AM Dejin Zheng <zhengdejin5@gmail.com> wrote:
>
> use phy_read_poll_timeout() to replace the poll codes for
> simplify lan87xx_read_status() function.
>
> Suggested-by: Andrew Lunn <andrew@lunn.ch>
> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
> ---
> v6 -> v7:
>         - adapt to a newly added parameter sleep_before_read.
> v5 -> v6:
>         - no changed.
> v4 -> v5:
>         - add msleep before phy_read_poll_timeout() to keep the
>           code more similar
> v3 -> v4:
>         - add this patch by Andrew's suggestion. Thanks Andrew!
>
>  drivers/net/phy/smsc.c | 16 +++++-----------
>  1 file changed, 5 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
> index b73298250793..93da7d3d0954 100644
> --- a/drivers/net/phy/smsc.c
> +++ b/drivers/net/phy/smsc.c
> @@ -112,8 +112,6 @@ static int lan87xx_read_status(struct phy_device *phydev)
>         int err = genphy_read_status(phydev);
>
>         if (!phydev->link && priv->energy_enable) {
> -               int i;
> -
>                 /* Disable EDPD to wake up PHY */
>                 int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
>                 if (rc < 0)
> @@ -125,15 +123,11 @@ static int lan87xx_read_status(struct phy_device *phydev)
>                         return rc;
>
>                 /* Wait max 640 ms to detect energy */
> -               for (i = 0; i < 64; i++) {
> -                       /* Sleep to allow link test pulses to be sent */
> -                       msleep(10);
> -                       rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
> -                       if (rc < 0)
> -                               return rc;
> -                       if (rc & MII_LAN83C185_ENERGYON)
> -                               break;
> -               }
> +               phy_read_poll_timeout(phydev, MII_LAN83C185_CTRL_STATUS, rc,
> +                                     rc & MII_LAN83C185_ENERGYON, 10000,
> +                                     640000, true);
> +               if (rc < 0)
> +                       return rc;
>
>                 /* Re-enable EDPD */
>                 rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
> --
> 2.25.0

This patch causes the kernel log to be spammed with the following when
Ethernet cable is not connected:
SMSC LAN8710/LAN8720 2188000.ethernet-1:00: lan87xx_read_status failed: -110

It still seems to work but I think that is only a fluke.

The "if (rc < 0)" is not actually checking the return value of
phy_read_poll_timeout but is looking at the value of the register
read.  I don't think rc will ever be negative in this case.  If you
change the code to "rc = phy_read_poll_timeout(...)" so that it
actually checks the error then the function will behave differently
than before.  The original code would only return an error if phy_read
returned an error.  On a timeout it just continued.  So the "if" could
be changed to "if (rc < 0 && rc != -ETIMEDOUT)".  But you will still
get the extra messages in the log that were not there before.

Kevin

Re: [PATCH net-next v7 09/10] net: phy: smsc: use phy_read_poll_timeout() to simplify the code

[Dejin Zheng]

On Mon, Jun 01, 2020 at 02:58:21PM -0400, Kevin Groeneveld wrote:
> On Mon, Mar 23, 2020 at 11:10 AM Dejin Zheng <zhengdejin5@gmail.com> wrote:
> >
> > use phy_read_poll_timeout() to replace the poll codes for
> > simplify lan87xx_read_status() function.
> >
> > Suggested-by: Andrew Lunn <andrew@lunn.ch>
> > Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
> > Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
> > ---
> > v6 -> v7:
> >         - adapt to a newly added parameter sleep_before_read.
> > v5 -> v6:
> >         - no changed.
> > v4 -> v5:
> >         - add msleep before phy_read_poll_timeout() to keep the
> >           code more similar
> > v3 -> v4:
> >         - add this patch by Andrew's suggestion. Thanks Andrew!
> >
> >  drivers/net/phy/smsc.c | 16 +++++-----------
> >  1 file changed, 5 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
> > index b73298250793..93da7d3d0954 100644
> > --- a/drivers/net/phy/smsc.c
> > +++ b/drivers/net/phy/smsc.c
> > @@ -112,8 +112,6 @@ static int lan87xx_read_status(struct phy_device
> *phydev)
> >         int err = genphy_read_status(phydev);
> >
> >         if (!phydev->link && priv->energy_enable) {
> > -               int i;
> > -
> >                 /* Disable EDPD to wake up PHY */
> >                 int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
> >                 if (rc < 0)
> > @@ -125,15 +123,11 @@ static int lan87xx_read_status(struct phy_device
> *phydev)
> >                         return rc;
> >
> >                 /* Wait max 640 ms to detect energy */
> > -               for (i = 0; i < 64; i++) {
> > -                       /* Sleep to allow link test pulses to be sent */
> > -                       msleep(10);
> > -                       rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
> > -                       if (rc < 0)
> > -                               return rc;
> > -                       if (rc & MII_LAN83C185_ENERGYON)
> > -                               break;
> > -               }
> > +               phy_read_poll_timeout(phydev, MII_LAN83C185_CTRL_STATUS,
> > +                                     rc & MII_LAN83C185_ENERGYON, 10000,
> > +                                     640000, true);
> > +               if (rc < 0)
> > +                       return rc;
> >
> >                 /* Re-enable EDPD */
> >                 rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
> > --
> > 2.25.0
> >
> 
> This patch causes the kernel log to be spammed with the following when
> Ethernet cable is not connected:
> SMSC LAN8710/LAN8720 2188000.ethernet-1:00: lan87xx_read_status failed: -110
>
Kevin, I am very sorry for the trouble caused by my patch. 

> It still seems to work but I think that is only a fluke.
> 
> The "if (rc < 0)" is not actually checking the return value of
> phy_read_poll_timeout but is looking at the value of the register read.  I
> don't think rc will ever be negative in this case.  If you change the code
> to "rc = phy_read_poll_timeout(...)" so that it actually checks the error
> then the function will behave differently than before.  The original code
> would only return an error if phy_read returned an error.  On a timeout it
> just continued.  So the "if" could be changed to "if (rc < 0 && rc !=
> -ETIMEDOUT)".  But you will still get the extra messages in the log that
> were not there before.
>
Yes, My patch did change the original behavior. It will not have error message
whether it is timeout or phy_read fails, but my patch changed it and will
print some error messages. It is my mistake. I'm so sorry for that.
How do you think of the following fix?

> >                 /* Wait max 640 ms to detect energy */
> > -               for (i = 0; i < 64; i++) {
> > -                       /* Sleep to allow link test pulses to be sent */
> > -                       msleep(10);
> > -                       rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
> > -                       if (rc < 0)
> > -                               return rc;
> > -                       if (rc & MII_LAN83C185_ENERGYON)
> > -                               break;
> > -               }
> > +               phy_read_poll_timeout(phydev, MII_LAN83C185_CTRL_STATUS,
> > +                                     rc & MII_LAN83C185_ENERGYON, 10000,
> > +                                     640000, true);
> > +               if (rc < 0)
> > +                       return rc;

		ret = read_poll_timeout(phy_read, rc, rc & MII_LAN83C185_ENERGYON || rc < 0,                                                         
		       		10000, 640000, true, phydev, MII_LAN83C185_CTRL_STATUS);
		if (!ret && rc < 0)
			return rc;
BR,
Dejin
>
> Kevin

[PATCH net-next v7 10/10] net: phy: tja11xx: use phy_read_poll_timeout() to simplify the code

[Dejin Zheng]

use phy_read_poll_timeout() to replace the poll codes for
simplify tja11xx_check() function.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v6 -> v7:
	- adapt to a newly added parameter sleep_before_read.
v5 -> v6:
	- no changed.
v4 -> v5:
	- no changed.
v3 -> v4:
	- add this patch by Andrew's suggestion. Thanks Andrew!

 drivers/net/phy/nxp-tja11xx.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
index b705d0bd798b..47caae770ffc 100644
--- a/drivers/net/phy/nxp-tja11xx.c
+++ b/drivers/net/phy/nxp-tja11xx.c
@@ -72,20 +72,10 @@ static struct tja11xx_phy_stats tja11xx_hw_stats[] = {
 
 static int tja11xx_check(struct phy_device *phydev, u8 reg, u16 mask, u16 set)
 {
-	int i, ret;
-
-	for (i = 0; i < 200; i++) {
-		ret = phy_read(phydev, reg);
-		if (ret < 0)
-			return ret;
-
-		if ((ret & mask) == set)
-			return 0;
-
-		usleep_range(100, 150);
-	}
+	int val;
 
-	return -ETIMEDOUT;
+	return phy_read_poll_timeout(phydev, reg, val, (val & mask) == set,
+				     150, 30000, false);
 }
 
 static int phy_modify_check(struct phy_device *phydev, u8 reg,
-- 
2.25.0

Re: [PATCH net-next v7 00/10] introduce read_poll_timeout

[David Miller]

From: Dejin Zheng <zhengdejin5@gmail.com>
Date: Mon, 23 Mar 2020 23:05:50 +0800

> This patch sets is introduce read_poll_timeout macro, it is an extension
> of readx_poll_timeout macro. the accessor function op just supports only
> one parameter in the readx_poll_timeout macro, but this macro can
> supports multiple variable parameters for it. so functions like
> phy_read(struct phy_device *phydev, u32 regnum) and
> phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum) can
> use this poll timeout framework.
> 
> the first patch introduce read_poll_timeout macro, and the second patch
> redefined readx_poll_timeout macro by read_poll_timeout(), and the other
> patches are examples using read_poll_timeout macro.
 ...

Series applied, thanks.