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Date: Tue, 17 Jan 2012 16:54:12 +0400
From: Dmitry Antipov <dmitry.antipov@...aro.org>
To: Steve Glendinning <steve.glendinning@...c.com>
Cc: Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linaro-dev@...ts.linaro.org, patches@...aro.org,
Dmitry Antipov <dmitry.antipov@...aro.org>
Subject: [PATCH 3/3] smsc95xx: use usleep_range(), get rid out of jiffies
Use usleep_range() with return value to implement time-bounded
wait-for hardware loop where delay is applicable; use ktime
instead of jiffies for a busy-wait loop.
Signed-off-by: Dmitry Antipov <dmitry.antipov@...aro.org>
---
drivers/net/usb/smsc95xx.c | 52 ++++++++++++++++++++-----------------------
1 files changed, 24 insertions(+), 28 deletions(-)
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index d45520e..7264090 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -114,19 +114,18 @@ static int smsc95xx_write_reg(struct usbnet *dev, u32 index, u32 data)
return ret;
}
-/* Loop until the read is completed with timeout
- * called with phy_mutex held */
+/* Busy-wait loop until the read is completed, but
+ no longer than 10ms. Called with phy_mutex held. */
static int smsc95xx_phy_wait_not_busy(struct usbnet *dev)
{
- unsigned long start_time = jiffies;
+ ktime_t start = ktime_get();
u32 val;
- do {
+ while (ktime_us_delta(ktime_get(), start) < 10000) {
smsc95xx_read_reg(dev, MII_ADDR, &val);
if (!(val & MII_BUSY_))
return 0;
- } while (!time_after(jiffies, start_time + HZ));
-
+ }
return -EIO;
}
@@ -195,15 +194,15 @@ static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
static int smsc95xx_wait_eeprom(struct usbnet *dev)
{
- unsigned long start_time = jiffies;
+ unsigned long timeout = 0;
u32 val;
do {
smsc95xx_read_reg(dev, E2P_CMD, &val);
if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
break;
- udelay(40);
- } while (!time_after(jiffies, start_time + HZ));
+ timeout += usleep_range(40, 50);
+ } while (timeout < USEC_PER_MSEC * 10);
if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
netdev_warn(dev->net, "EEPROM read operation timeout\n");
@@ -215,17 +214,15 @@ static int smsc95xx_wait_eeprom(struct usbnet *dev)
static int smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
{
- unsigned long start_time = jiffies;
+ unsigned long timeout = 0;
u32 val;
do {
smsc95xx_read_reg(dev, E2P_CMD, &val);
-
if (!(val & E2P_CMD_BUSY_))
return 0;
-
- udelay(40);
- } while (!time_after(jiffies, start_time + HZ));
+ timeout += usleep_range(40, 50);
+ } while (timeout < USEC_PER_MSEC * 10);
netdev_warn(dev->net, "EEPROM is busy\n");
return -EIO;
@@ -674,7 +671,8 @@ static void smsc95xx_start_rx_path(struct usbnet *dev)
static int smsc95xx_phy_initialize(struct usbnet *dev)
{
- int bmcr, timeout = 0;
+ int bmcr;
+ unsigned long timeout = 0;
/* Initialize MII structure */
dev->mii.dev = dev->net;
@@ -688,12 +686,11 @@ static int smsc95xx_phy_initialize(struct usbnet *dev)
smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
do {
- msleep(10);
+ timeout += usleep_range(10000, 15000);
bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
- timeout++;
- } while ((bmcr & BMCR_RESET) && (timeout < 100));
+ } while ((bmcr & BMCR_RESET) && (timeout < USEC_PER_SEC));
- if (timeout >= 100) {
+ if (timeout >= USEC_PER_SEC) {
netdev_warn(dev->net, "timeout on PHY Reset");
return -EIO;
}
@@ -717,7 +714,8 @@ static int smsc95xx_reset(struct usbnet *dev)
{
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
u32 read_buf, write_buf, burst_cap;
- int ret = 0, timeout;
+ unsigned long timeout;
+ int ret = 0;
netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
@@ -736,11 +734,10 @@ static int smsc95xx_reset(struct usbnet *dev)
netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
return ret;
}
- msleep(10);
- timeout++;
- } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
+ timeout += usleep_range(10000, 15000);
+ } while ((read_buf & HW_CFG_LRST_) && (timeout < USEC_PER_SEC));
- if (timeout >= 100) {
+ if (timeout >= USEC_PER_SEC) {
netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
return ret;
}
@@ -759,11 +756,10 @@ static int smsc95xx_reset(struct usbnet *dev)
netdev_warn(dev->net, "Failed to read PM_CTRL: %d\n", ret);
return ret;
}
- msleep(10);
- timeout++;
- } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
+ timeout += usleep_range(10000, 15000);
+ } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < USEC_PER_SEC));
- if (timeout >= 100) {
+ if (timeout >= USEC_PER_SEC) {
netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
return ret;
}
--
1.7.7.5
--
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