From 54dfbb08051c2fa666bd4ce6cb7626b9e2a80655 Mon Sep 17 00:00:00 2001 From: Fabio Baltieri Date: Wed, 3 Apr 2013 10:45:08 +0200 Subject: usb: phy: ab8500-usb: enable/disable regulator on phy events Add ab8500_usb_regulator_{enable,disable} functions to control USB phy regulators on corresponding ab8500_usb_phy_{enable,disable} events. This contains some workaround and optimization for specific AB8500 versions. Signed-off-by: Mian Yousaf Kaukab Signed-off-by: Sakethram Bommisetti Signed-off-by: Praveena Nadahally Acked-by: Linus Walleij Signed-off-by: Fabio Baltieri Signed-off-by: Felipe Balbi --- drivers/usb/phy/phy-ab8500-usb.c | 68 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 66 insertions(+), 2 deletions(-) (limited to 'drivers/usb/phy') diff --git a/drivers/usb/phy/phy-ab8500-usb.c b/drivers/usb/phy/phy-ab8500-usb.c index 58b194b72432..96b4854f25df 100644 --- a/drivers/usb/phy/phy-ab8500-usb.c +++ b/drivers/usb/phy/phy-ab8500-usb.c @@ -130,6 +130,7 @@ struct ab8500_usb { struct regulator *v_ape; struct regulator *v_musb; struct regulator *v_ulpi; + int saved_v_ulpi; int previous_link_status_state; }; @@ -161,6 +162,67 @@ static void ab8500_usb_wd_workaround(struct ab8500_usb *ab) 0); } +static void ab8500_usb_regulator_enable(struct ab8500_usb *ab) +{ + int ret, volt; + + regulator_enable(ab->v_ape); + + if (!is_ab8500_2p0_or_earlier(ab->ab8500)) { + ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi); + if (ab->saved_v_ulpi < 0) + dev_err(ab->dev, "Failed to get v_ulpi voltage\n"); + + ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000); + if (ret < 0) + dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n", + ret); + + ret = regulator_set_optimum_mode(ab->v_ulpi, 28000); + if (ret < 0) + dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n", + ret); + } + + regulator_enable(ab->v_ulpi); + + if (!is_ab8500_2p0_or_earlier(ab->ab8500)) { + volt = regulator_get_voltage(ab->v_ulpi); + if ((volt != 1300000) && (volt != 1350000)) + dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n", + volt); + } + + regulator_enable(ab->v_musb); +} + +static void ab8500_usb_regulator_disable(struct ab8500_usb *ab) +{ + int ret; + + regulator_disable(ab->v_musb); + + regulator_disable(ab->v_ulpi); + + /* USB is not the only consumer of Vintcore, restore old settings */ + if (!is_ab8500_2p0_or_earlier(ab->ab8500)) { + if (ab->saved_v_ulpi > 0) { + ret = regulator_set_voltage(ab->v_ulpi, + ab->saved_v_ulpi, ab->saved_v_ulpi); + if (ret < 0) + dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n", + ab->saved_v_ulpi, ret); + } + + ret = regulator_set_optimum_mode(ab->v_ulpi, 0); + if (ret < 0) + dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n", + ret); + } + + regulator_disable(ab->v_ape); +} + static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit) { /* Workaround for v2.0 bug # 31952 */ @@ -178,6 +240,8 @@ static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host) bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN : AB8500_BIT_PHY_CTRL_DEVICE_EN; + ab8500_usb_regulator_enable(ab); + abx500_mask_and_set_register_interruptible(ab->dev, AB8500_USB, AB8500_USB_PHY_CTRL_REG, bit, bit); @@ -197,6 +261,8 @@ static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host) /* Needed to disable the phy.*/ ab8500_usb_wd_workaround(ab); + + ab8500_usb_regulator_disable(ab); } #define ab8500_usb_host_phy_en(ab) ab8500_usb_phy_enable(ab, true) @@ -544,7 +610,6 @@ static int ab8500_usb_set_peripheral(struct usb_otg *otg, */ if (!gadget) { - /* TODO: Disable regulators. */ otg->gadget = NULL; schedule_work(&ab->phy_dis_work); } else { @@ -576,7 +641,6 @@ static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host) */ if (!host) { - /* TODO: Disable regulators. */ otg->host = NULL; schedule_work(&ab->phy_dis_work); } else { -- cgit v1.2.3-59-g8ed1b