linux-toradex.git/drivers/usb/host, branch v2.6.19

USB: OHCI: fix root-hub resume bug

2006-11-16T22:26:11+00:00

When a suspended OHCI controller sees a port's status change, it sets
both the Root-Hub-Status-Change and the Resume-Detect bits in the
Interrupt Status register.  Processing both these bits, the driver
tries to resume the root hub twice!

This patch (as807) fixes the bug by ignoring RD if RHSC is set.  It
also prints a slightly more informative log message when a
remote-wakeup event occurs.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

OHCI: disallow autostop when wakeup is not available

2006-11-16T22:26:11+00:00

This patch (as822) prevents the OHCI autostop mechanism from kicking in
if the root hub is not able or not allowed to issue wakeup requests.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

UHCI: workaround for Asus motherboard

2006-10-17T21:46:31+00:00

This patch (as798) adds a workaround to uhci-hcd.  At least one Asus
motherboard is wired in such a way that any device attached to a
suspended UHCI controller will prevent the system from entering
suspend-to-RAM by immediately waking it up.  The only way around the
problem is to turn the controller off instead of suspending it.

This fixes Bugzilla #6193.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

USB: ohci-pnx4008 build fixes

2006-10-17T21:46:30+00:00

The OHCI bus glue for the Philips PNX chips is missing a few calls.

 - Bus suspend/resume were wrongly omitted in the original submission.
 - Two new calls were added since that glue was submitted:
     * Root hub irq enable call
     * Shutdown hook for usbcore

Plus usb_bus.hcpriv has now been removed from usbcore.

Signed-off-by: David Brownell 
Signed-off-by: Greg Kroah-Hartman

USB: revert EHCI VIA workaround patch

2006-10-17T20:57:18+00:00

This reverts 26f953fd884ea4879585287917f855c63c6b2666 which caused
resume problems on the mac mini.

Cc: David Brownell 
Signed-off-by: Greg Kroah-Hartman

[PATCH] ohci: don't play with IRQ regs

2006-10-06T15:53:40+00:00

This is a more correct fix for the way the ohci hcd was referencing pt_regs
in the unlink paths.

Signed-off-by: David Brownell 
Cc: Greg KH 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

2006-10-05T14:10:12+00:00

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells 
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

Remove all inclusions of

2006-10-04T07:38:54+00:00

kbuild explicitly includes this at build time.

Signed-off-by: Dave Jones

USB: fix build error in ohci driver

2006-09-29T00:06:45+00:00

Thanks to Andrew for the original patch for this.
I need to upgrade my version of gcc to catch these things...

Signed-off-by: Greg Kroah-Hartman

OHCI: add auto-stop support

2006-09-28T22:36:46+00:00

This patch (as790b) adds "autostop" support to ohci-hcd: the driver
will automatically stop the host controller when no devices have been
connected for at least one second.  This feature is useful when the
USB autosuspend facility isn't available, such as when
CONFIG_USB_SUSPEND hasn't been set.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman