diff options
| author | Mike J. Chen <mjchen@google.com> | 2012-03-26 15:35:28 -0700 |
|---|---|---|
| committer | Mike J. Chen <mjchen@google.com> | 2012-03-26 15:35:28 -0700 |
| commit | 10e01499cf44ac7291e89719f4cb11a94f944696 (patch) | |
| tree | 55313bf40da7c266e6b06d30b194e12dd79842a3 | |
| parent | fc7400093da994e9855cc045f9f8e226f4817e85 (diff) | |
| download | uboot-10e01499cf44ac7291e89719f4cb11a94f944696.tar.gz | |
TWL4030: Force power down before powering up the PHY
To address issues with USB not enumerating properly when the cable
is connected on a warm reboot, make sure the PHY is powered down
before powering it up. This results in proper enumeration on a
warm reboot.
Change-Id: If52df6386ec7c8bd3c6715b96644e1dad752b9a7
| -rw-r--r-- | drivers/usb/phy/twl4030.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/usb/phy/twl4030.c b/drivers/usb/phy/twl4030.c index 54d2e615c..6dcf6c92e 100644 --- a/drivers/usb/phy/twl4030.c +++ b/drivers/usb/phy/twl4030.c @@ -118,10 +118,22 @@ static void twl4030_phy_power(void) { u8 pwr, clk; - /* Power the PHY */ + /* First make sure PHY is powered down to + * clear any state from a previous reboot and + * force unenumeration. Otherwise, sometimes + * the device doesn't enumerate properly on + * a warm reboot. + */ + + /* Power down the PHY */ pwr = twl4030_usb_read(TWL4030_USB_PHY_PWR_CTRL); + pwr |= PHYPWD; + twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr); + + /* Power the PHY */ pwr &= ~PHYPWD; twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr); + /* Enable clocks */ clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL); clk |= CLOCKGATING_EN | CLK32K_EN; @@ -139,6 +151,8 @@ int twl4030_usb_ulpi_init(void) long timeout = 1000 * 1000; /* 1 sec */; u8 clk, sts, pwr; + i2c_set_bus_num(0); + /* twl4030 ldo init */ twl4030_usb_ldo_init(); |