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usb: phy: ab8500-usb: fix eye diagram for ab8500 v2.0 

AB8500 v2.0 has eye diagram issues when drawing more than 100mA from
VBUS.  Force charging current to 100mA in case of standard host.

Signed-off-by: Sakethram Bommisetti <sakethram.bommisetti@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Sakethram Bommisetti 2013-04-03 10:45:05 +02:00 committed by Felipe Balbi
parent 7124631aa8
commit c2a0ab6bd5
1 changed files with 15 additions and 0 deletions
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15
drivers/usb/phy/phy-ab8500-usb.c
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@ -485,6 +485,19 @@ static void ab8500_usb_phy_disable_work(struct work_struct *work)
ab8500_usb_peri_phy_dis(ab); ab8500_usb_peri_phy_dis(ab);
} }
static unsigned ab8500_eyediagram_workaroud(struct ab8500_usb *ab, unsigned mA)
{
/*
* AB8500 V2 has eye diagram issues when drawing more than 100mA from
* VBUS. Set charging current to 100mA in case of standard host
*/
if (is_ab8500_2p0_or_earlier(ab->ab8500))
if (mA > 100)
mA = 100;
return mA;
}
static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA) static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA)
{ {
struct ab8500_usb *ab; struct ab8500_usb *ab;
@ -494,6 +507,8 @@ static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA)
ab = phy_to_ab(phy); ab = phy_to_ab(phy);
mA = ab8500_eyediagram_workaroud(ab, mA);
ab->vbus_draw = mA; ab->vbus_draw = mA;
if (mA) if (mA)