From: Sergei Shtylyov Date: Wed, 6 Jul 2011 19:19:38 +0000 (+0400) Subject: EHCI: only power off port if over-current is active X-Git-Tag: v3.0.1~20 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e151a2a6651a0a46fc03a845614b23c3b630042e;p=profile%2Fivi%2Fkernel-adaptation-intel-automotive.git EHCI: only power off port if over-current is active commit 81463c1d707186adbbe534016cd1249edeab0dac upstream. MAX4967 USB power supply chip we use on our boards signals over-current when power is not enabled; once it's enabled, over-current signal returns to normal. That unfortunately caused the endless stream of "over-current change on port" messages. The EHCI root hub code reacts on every over-current signal change with powering off the port -- such change event is generated the moment the port power is enabled, so once enabled the power is immediately cut off. I think we should only cut off power when we're seeing the active over-current signal, so I'm adding such check to that code. I also think that the fact that we've cut off the port power should be reflected in the result of GetPortStatus request immediately, hence I'm adding a PORTSCn register readback after write... Signed-off-by: Sergei Shtylyov Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index ea6184b..88cfb8f 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -891,10 +891,11 @@ static int ehci_hub_control ( * power switching; they're allowed to just limit the * current. khubd will turn the power back on. */ - if (HCS_PPC (ehci->hcs_params)){ + if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) { ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_POWER), status_reg); + temp = ehci_readl(ehci, status_reg); } }