From: Sakethram Bommisetti <sakethram.bommisetti@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Fabio Baltieri <fabio.baltieri@xxxxxxxxxx>
---
drivers/usb/phy/phy-ab8500-usb.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/usb/phy/phy-ab8500-usb.c b/drivers/usb/phy/phy-ab8500-usb.c
index 5b92a59..1fd0780 100644
--- a/drivers/usb/phy/phy-ab8500-usb.c
+++ b/drivers/usb/phy/phy-ab8500-usb.c
@@ -485,6 +485,18 @@ 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 +506,8 @@ 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)
--
1.8.1.3
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