diff options
| author | Sakethram Bommisetti <sakethram.bommisetti@stericsson.com> | 2013-04-03 12:45:05 +0400 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-04-03 13:00:25 +0400 |
| commit | c2a0ab6bd5ccf031f87bc678152fb70befea5786 (patch) | |
| tree | 0a7e8b976f2dd3b96c8286884f8bb5f59fadc4fc | |
| parent | 7124631aa892712fc8b317ff34d25c14dee6f63d (diff) | |
| download | linux-c2a0ab6bd5ccf031f87bc678152fb70befea5786.tar.xz | |
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>
| -rw-r--r-- | drivers/usb/phy/phy-ab8500-usb.c | 15 |
1 files changed, 15 insertions, 0 deletions
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) |