From c2a0ab6bd5ccf031f87bc678152fb70befea5786 Mon Sep 17 00:00:00 2001 From: Sakethram Bommisetti Date: Wed, 3 Apr 2013 10:45:05 +0200 Subject: 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 Acked-by: Linus Walleij Signed-off-by: Fabio Baltieri Signed-off-by: Felipe Balbi --- drivers/usb/phy/phy-ab8500-usb.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/usb/phy/phy-ab8500-usb.c b/drivers/usb/phy/phy-ab8500-usb.c index 5b92a59804eb..441b2954cffd 100644 --- a/drivers/usb/phy/phy-ab8500-usb.c +++ b/drivers/usb/phy/phy-ab8500-usb.c @@ -485,6 +485,19 @@ static void ab8500_usb_phy_disable_work(struct work_struct *work) 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) { 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); + mA = ab8500_eyediagram_workaroud(ab, mA); + ab->vbus_draw = mA; if (mA) -- cgit v1.2.3