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usb: phy: ab8500-usb: restart phy during probe

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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>
This commit is contained in:
Sakethram Bommisetti
2013-05-15 14:03:27 +02:00
committed by Felipe Balbi
parent d0ed0645a5
commit fb21f37a52
1 changed files with 33 additions and 0 deletions
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33
drivers/usb/phy/phy-ab8500-usb.c
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@@ -668,6 +668,33 @@ static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
return 0; 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) static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
{ {
int err; int err;
@@ -887,6 +914,12 @@ static int ab8500_usb_probe(struct platform_device *pdev)
/* Needed to enable ID detection. */ /* Needed to enable ID detection. */
ab8500_usb_wd_workaround(ab); 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); abx500_usb_link_status_update(ab);
dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev); dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);