diff options
Diffstat (limited to 'recipes/linux/linux-omap-2.6.29/musb/0005-USB-TWL-disable-VUSB-regulators-when-cable-unplugg.patch')
| -rw-r--r-- | recipes/linux/linux-omap-2.6.29/musb/0005-USB-TWL-disable-VUSB-regulators-when-cable-unplugg.patch | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap-2.6.29/musb/0005-USB-TWL-disable-VUSB-regulators-when-cable-unplugg.patch b/recipes/linux/linux-omap-2.6.29/musb/0005-USB-TWL-disable-VUSB-regulators-when-cable-unplugg.patch new file mode 100644 index 0000000000..db3481b87b --- /dev/null +++ b/recipes/linux/linux-omap-2.6.29/musb/0005-USB-TWL-disable-VUSB-regulators-when-cable-unplugg.patch @@ -0,0 +1,181 @@ +From 60e7ce93befe795357db05001fe4caab522a421d Mon Sep 17 00:00:00 2001 +From: Jouni Hogander <jouni.hogander-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org> +Date: Tue, 24 Mar 2009 17:22:57 -0700 +Subject: [PATCH] USB: TWL: disable VUSB regulators when cable unplugged + +This patch disables USB regulators VUSB1V5, VUSB1V8, and VUSB3V1 +when the USB cable is unplugged to reduce power consumption. +Added a depencency from twl4030 usb driver to TWL_REGULATOR. + +Signed-off-by: Jouni Hogander <jouni.hogander-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org> +Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi-sMOQStClEysAvxtiuMwx3w@public.gmane.org> +Signed-off-by: Greg Kroah-Hartman <gregkh-l3A5Bk7waGM@public.gmane.org> +--- + drivers/usb/otg/Kconfig | 2 +- + drivers/usb/otg/twl4030-usb.c | 73 ++++++++++++++++++++++++++++++++++++----- + 2 files changed, 65 insertions(+), 10 deletions(-) + +diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig +index ee55b44..5790a5b 100644 +--- a/drivers/usb/otg/Kconfig ++++ b/drivers/usb/otg/Kconfig +@@ -43,7 +43,7 @@ config ISP1301_OMAP + + config TWL4030_USB + tristate "TWL4030 USB Transceiver Driver" +- depends on TWL4030_CORE ++ depends on TWL4030_CORE && REGULATOR_TWL4030 + select USB_OTG_UTILS + help + Enable this to support the USB OTG transceiver on TWL4030 +diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c +index 416e441..d9478d0 100644 +--- a/drivers/usb/otg/twl4030-usb.c ++++ b/drivers/usb/otg/twl4030-usb.c +@@ -34,6 +34,8 @@ + #include <linux/delay.h> + #include <linux/usb/otg.h> + #include <linux/i2c/twl4030.h> ++#include <linux/regulator/consumer.h> ++#include <linux/err.h> + + + /* Register defines */ +@@ -246,6 +248,11 @@ struct twl4030_usb { + struct otg_transceiver otg; + struct device *dev; + ++ /* TWL4030 internal USB regulator supplies */ ++ struct regulator *usb1v5; ++ struct regulator *usb1v8; ++ struct regulator *usb3v1; ++ + /* for vbus reporting with irqs disabled */ + spinlock_t lock; + +@@ -434,6 +441,18 @@ static void twl4030_phy_power(struct twl4030_usb *twl, int on) + + pwr = twl4030_usb_read(twl, PHY_PWR_CTRL); + if (on) { ++ regulator_enable(twl->usb3v1); ++ regulator_enable(twl->usb1v8); ++ /* ++ * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP ++ * in twl4030) resets the VUSB_DEDICATED2 register. This reset ++ * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to ++ * SLEEP. We work around this by clearing the bit after usv3v1 ++ * is re-activated. This ensures that VUSB3V1 is really active. ++ */ ++ twl4030_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_usb_write(twl, PHY_CLK_CTRL, +@@ -443,6 +462,9 @@ static void twl4030_phy_power(struct twl4030_usb *twl, int on) + } else { + pwr |= PHY_PWR_PHYPWD; + WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0); ++ regulator_disable(twl->usb1v5); ++ regulator_disable(twl->usb1v8); ++ regulator_disable(twl->usb3v1); + } + } + +@@ -468,7 +490,7 @@ static void twl4030_phy_resume(struct twl4030_usb *twl) + twl->asleep = 0; + } + +-static void twl4030_usb_ldo_init(struct twl4030_usb *twl) ++static int twl4030_usb_ldo_init(struct twl4030_usb *twl) + { + /* Enable writing to power configuration registers */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY); +@@ -480,20 +502,45 @@ static void twl4030_usb_ldo_init(struct twl4030_usb *twl) + /* input to VUSB3V1 LDO is from VBAT, not VBUS */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1); + +- /* turn on 3.1V regulator */ +- twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP); ++ /* Initialize 3.1V regulator */ ++ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP); ++ ++ twl->usb3v1 = regulator_get(twl->dev, "usb3v1"); ++ if (IS_ERR(twl->usb3v1)) ++ return -ENODEV; ++ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE); + +- /* turn on 1.5V regulator */ +- twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP); ++ /* Initialize 1.5V regulator */ ++ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP); ++ ++ twl->usb1v5 = regulator_get(twl->dev, "usb1v5"); ++ if (IS_ERR(twl->usb1v5)) ++ goto fail1; ++ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE); + +- /* turn on 1.8V regulator */ +- twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP); ++ /* Initialize 1.8V regulator */ ++ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP); ++ ++ twl->usb1v8 = regulator_get(twl->dev, "usb1v8"); ++ if (IS_ERR(twl->usb1v8)) ++ goto fail2; ++ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE); + + /* disable access to power configuration registers */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY); ++ ++ return 0; ++ ++fail2: ++ regulator_put(twl->usb1v5); ++ twl->usb1v5 = NULL; ++fail1: ++ regulator_put(twl->usb3v1); ++ twl->usb3v1 = NULL; ++ return -ENODEV; + } + + static ssize_t twl4030_usb_vbus_show(struct device *dev, +@@ -598,7 +645,7 @@ static int __init twl4030_usb_probe(struct platform_device *pdev) + { + struct twl4030_usb_data *pdata = pdev->dev.platform_data; + struct twl4030_usb *twl; +- int status; ++ int status, err; + + if (!pdata) { + dev_dbg(&pdev->dev, "platform_data not available\n"); +@@ -622,7 +669,12 @@ static int __init twl4030_usb_probe(struct platform_device *pdev) + /* init spinlock for workqueue */ + spin_lock_init(&twl->lock); + +- twl4030_usb_ldo_init(twl); ++ err = twl4030_usb_ldo_init(twl); ++ if (err) { ++ dev_err(&pdev->dev, "ldo init failed\n"); ++ kfree(twl); ++ return err; ++ } + otg_set_transceiver(&twl->otg); + + platform_set_drvdata(pdev, twl); +@@ -688,6 +740,9 @@ static int __exit twl4030_usb_remove(struct platform_device *pdev) + twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB); + + twl4030_phy_power(twl, 0); ++ regulator_put(twl->usb1v5); ++ regulator_put(twl->usb1v8); ++ regulator_put(twl->usb3v1); + + kfree(twl); + +-- +1.6.0.4 + |