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| author | Sakethram Bommisetti <sakethram.bommisetti@stericsson.com> | 2013-05-15 14:03:27 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-05-28 20:01:01 +0300 |
| commit | fb21f37a5249374ed63f763455a0b07b80c1e50c (patch) | |
| tree | a4a4339cd9cba88cd7521ac3a3a979fd1007e744 /drivers/usb/phy | |
| parent | d0ed0645a5cfb0cccca6baa84b459eb2078e7fb1 (diff) | |
| download | linux-fb21f37a5249374ed63f763455a0b07b80c1e50c.tar.gz linux-fb21f37a5249374ed63f763455a0b07b80c1e50c.tar.bz2 linux-fb21f37a5249374ed63f763455a0b07b80c1e50c.zip | |
usb: phy: ab8500-usb: restart phy during probe
Add an ab8500_usb_restart_phy() function called during probe to ensure
that the AB8500 USB phy is initialized properly even when a cable is
connected at probe time.
Without this fix subsequent host reconnections are not detected
properly.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Sakethram Bommisetti <sakethram.bommisetti@stericsson.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/phy')
| -rw-r--r-- | drivers/usb/phy/phy-ab8500-usb.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-ab8500-usb.c b/drivers/usb/phy/phy-ab8500-usb.c index bdf7f570b5e4..63bb7cc14a2a 100644 --- a/drivers/usb/phy/phy-ab8500-usb.c +++ b/drivers/usb/phy/phy-ab8500-usb.c @@ -668,6 +668,33 @@ static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host) return 0; } +static void ab8500_usb_restart_phy(struct ab8500_usb *ab) +{ + abx500_mask_and_set_register_interruptible(ab->dev, + AB8500_USB, AB8500_USB_PHY_CTRL_REG, + AB8500_BIT_PHY_CTRL_DEVICE_EN, + AB8500_BIT_PHY_CTRL_DEVICE_EN); + + udelay(100); + + abx500_mask_and_set_register_interruptible(ab->dev, + AB8500_USB, AB8500_USB_PHY_CTRL_REG, + AB8500_BIT_PHY_CTRL_DEVICE_EN, + 0); + + abx500_mask_and_set_register_interruptible(ab->dev, + AB8500_USB, AB8500_USB_PHY_CTRL_REG, + AB8500_BIT_PHY_CTRL_HOST_EN, + AB8500_BIT_PHY_CTRL_HOST_EN); + + udelay(100); + + abx500_mask_and_set_register_interruptible(ab->dev, + AB8500_USB, AB8500_USB_PHY_CTRL_REG, + AB8500_BIT_PHY_CTRL_HOST_EN, + 0); +} + static int ab8500_usb_regulator_get(struct ab8500_usb *ab) { int err; @@ -887,6 +914,12 @@ static int ab8500_usb_probe(struct platform_device *pdev) /* Needed to enable ID detection. */ ab8500_usb_wd_workaround(ab); + /* + * This is required for usb-link-status to work properly when a + * cable is connected at boot time. + */ + ab8500_usb_restart_phy(ab); + abx500_usb_link_status_update(ab); dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev); |