redonkable/alistair23-linux
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USB: EHCI hooks for high speed electrical tests

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EHCI hooks for high speed electrical tests of the root hub ports.

The expectation is that a usermode program actually triggers the test,
making the same control request it would make for an external hub.
Tests for peripheral upstream ports would issue a different request.
In all cases, the hardware needs re-initialization before it could
be used "normally" again (e.g. unplug/replug, rmmod/modprobe).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2006-11-16 23:56:15 -08:00 committed by Greg Kroah-Hartman
parent 1f26e28d3e
commit f0d7f27351
1 changed files with 19 additions and 0 deletions
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19
drivers/usb/host/ehci-hub.c
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@ -319,6 +319,7 @@ static int ehci_hub_control (
u32 temp, status;
unsigned long flags;
int retval = 0;
unsigned selector;
/*
* FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
@ -506,6 +507,8 @@ static int ehci_hub_control (
}
break;
case SetPortFeature:
selector = wIndex >> 8;
wIndex &= 0xff;
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
@ -559,6 +562,22 @@ static int ehci_hub_control (
}
writel (temp, &ehci->regs->port_status [wIndex]);
break;
/* For downstream facing ports (these): one hub port is put
* into test mode according to USB2 11.24.2.13, then the hub
* must be reset (which for root hub now means rmmod+modprobe,
* or else system reboot). See EHCI 2.3.9 and 4.14 for info
* about the EHCI-specific stuff.
*/
case USB_PORT_FEAT_TEST:
if (!selector || selector > 5)
goto error;
ehci_quiesce(ehci);
ehci_halt(ehci);
temp |= selector << 16;
writel (temp, &ehci->regs->port_status [wIndex]);
break;
default:
goto error;
}