diff options
Diffstat (limited to 'drivers/usb/otg/twl4030-usb.c')
| -rw-r--r-- | drivers/usb/otg/twl4030-usb.c | 74 |
1 files changed, 51 insertions, 23 deletions
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c index 0e8888588d4e..0bc97698af15 100644 --- a/drivers/usb/otg/twl4030-usb.c +++ b/drivers/usb/otg/twl4030-usb.c @@ -347,11 +347,20 @@ static void twl4030_i2c_access(struct twl4030_usb *twl, int on) } } -static void twl4030_phy_power(struct twl4030_usb *twl, int on) +static void __twl4030_phy_power(struct twl4030_usb *twl, int on) { - u8 pwr; + u8 pwr = twl4030_usb_read(twl, PHY_PWR_CTRL); + + if (on) + pwr &= ~PHY_PWR_PHYPWD; + else + pwr |= PHY_PWR_PHYPWD; - pwr = twl4030_usb_read(twl, PHY_PWR_CTRL); + WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0); +} + +static void twl4030_phy_power(struct twl4030_usb *twl, int on) +{ if (on) { regulator_enable(twl->usb3v1); regulator_enable(twl->usb1v8); @@ -365,15 +374,13 @@ static void twl4030_phy_power(struct twl4030_usb *twl, int on) twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2); regulator_enable(twl->usb1v5); - pwr &= ~PHY_PWR_PHYPWD; - WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0); + __twl4030_phy_power(twl, 1); twl4030_usb_write(twl, PHY_CLK_CTRL, twl4030_usb_read(twl, PHY_CLK_CTRL) | (PHY_CLK_CTRL_CLOCKGATING_EN | PHY_CLK_CTRL_CLK32K_EN)); - } else { - pwr |= PHY_PWR_PHYPWD; - WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0); + } else { + __twl4030_phy_power(twl, 0); regulator_disable(twl->usb1v5); regulator_disable(twl->usb1v8); regulator_disable(twl->usb3v1); @@ -387,19 +394,25 @@ static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off) twl4030_phy_power(twl, 0); twl->asleep = 1; + dev_dbg(twl->dev, "%s\n", __func__); } -static void twl4030_phy_resume(struct twl4030_usb *twl) +static void __twl4030_phy_resume(struct twl4030_usb *twl) { - if (!twl->asleep) - return; - twl4030_phy_power(twl, 1); twl4030_i2c_access(twl, 1); twl4030_usb_set_mode(twl, twl->usb_mode); if (twl->usb_mode == T2_USB_MODE_ULPI) twl4030_i2c_access(twl, 0); +} + +static void twl4030_phy_resume(struct twl4030_usb *twl) +{ + if (!twl->asleep) + return; + __twl4030_phy_resume(twl); twl->asleep = 0; + dev_dbg(twl->dev, "%s\n", __func__); } static int twl4030_usb_ldo_init(struct twl4030_usb *twl) @@ -408,8 +421,8 @@ static int twl4030_usb_ldo_init(struct twl4030_usb *twl) twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY); twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x0C, PROTECT_KEY); - /* put VUSB3V1 LDO in active state */ - twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2); + /* Keep VUSB3V1 LDO in sleep state until VBUS/ID change detected*/ + /*twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);*/ /* input to VUSB3V1 LDO is from VBAT, not VBUS */ twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1); @@ -502,6 +515,26 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl) return IRQ_HANDLED; } +static void twl4030_usb_phy_init(struct twl4030_usb *twl) +{ + int status; + + status = twl4030_usb_linkstat(twl); + if (status >= 0) { + if (status == USB_EVENT_NONE) { + __twl4030_phy_power(twl, 0); + twl->asleep = 1; + } else { + __twl4030_phy_resume(twl); + twl->asleep = 0; + } + + blocking_notifier_call_chain(&twl->otg.notifier, status, + twl->otg.gadget); + } + sysfs_notify(&twl->dev->kobj, NULL, "vbus"); +} + static int twl4030_set_suspend(struct otg_transceiver *x, int suspend) { struct twl4030_usb *twl = xceiv_to_twl(x); @@ -568,7 +601,7 @@ static int __devinit twl4030_usb_probe(struct platform_device *pdev) twl->otg.set_peripheral = twl4030_set_peripheral; twl->otg.set_suspend = twl4030_set_suspend; twl->usb_mode = pdata->usb_mode; - twl->asleep = 1; + twl->asleep = 1; /* init spinlock for workqueue */ spin_lock_init(&twl->lock); @@ -606,15 +639,10 @@ static int __devinit twl4030_usb_probe(struct platform_device *pdev) return status; } - /* The IRQ handler just handles changes from the previous states - * of the ID and VBUS pins ... in probe() we must initialize that - * previous state. The easy way: fake an IRQ. - * - * REVISIT: a real IRQ might have happened already, if PREEMPT is - * enabled. Else the IRQ may not yet be configured or enabled, - * because of scheduling delays. + /* Power down phy or make it work according to + * current link state. */ - twl4030_usb_irq(twl->irq, twl); + twl4030_usb_phy_init(twl); dev_info(&pdev->dev, "Initialized TWL4030 USB module\n"); return 0; |