VIA chipset discussion
Quoted 6 lines · Pete Toscano
according to the linux-usb maintainers, it's a pci irq routing problem. i've asked jeff garzik and martin mares if they'll look into it, but they're pretty busy and i haven't heard anything back from them (not that'd i'd expect to for quite a while, considering their load). i've asked on the list too, but i've only heard back from people with the same problem, not anyone who can fix the problem.
I'm using kernel module below. Find which device your USB is. If it is 0:07.2 and 0:07.3, take 7*8 + 2 = 58 (resp. 59). Then try
for irq in 16 17 18 19; do
insmod setpci devfn=58 irq=$irq
insmod setpci devfn=59 irq=$irq
modprobe <your usb ohci/uhci/alt-uhci>
does it work -> stop
done
After you'll find correct IRQ, you are done ;-) Put this into your initscript before usb loading (you must compile USB as module), or you can insert your devfn/irq pair somewhere into pirq_get_info()...
My BIOS (Apollo Pro 133x) returns incorrect routing table when LPT is not in ECP mode. When it is in ECP, reported routing table is correct (and my USB is on IRQ19, if that matters).
/*
# Based on Makefile for the Linux video drivers.
# 5 Aug 1999, James Simmons, <mailto:[email protected]> # Rewritten to use lists instead of if-statements.
default:
(cd /usr/src/linux; make SUBDIRS=/usr/src/linus/pci modules)
O_TARGET := setp.o
# All of the (potential) objects that export symbols. # This list comes from 'grep -l EXPORT_SYMBOL *.[hc]'.
# Each configuration option enables a list of files.
obj-m += setpci.o
ifdef TOPDIR
include $(TOPDIR)/Rules.make
endif
clean:
rm -f core *.o *.a *.s
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/pci.h>
static unsigned int devfn = -1;
static unsigned int irq = -1;MODULE_PARM(devfn, "i");MODULE_PARM(irq, "i");
static int loadme(void) {
struct pci_dev* dev;
pci_for_each_dev(dev) {
printk(KERN_DEBUG "%p: %04X: %04X:%04X -> %d\n",
dev, dev->devfn, dev->vendor, dev->device, dev->irq);
if (dev->devfn == devfn)
dev->irq = irq;
}
return -EBUSY;
}module_init(loadme);
Best regards,
Petr Vandrovec [email protected]
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected]
Please read the FAQ at http://www.tux.org/lkml/