Everyone:
Here is a preliminary patch for the UHCI driver that may solve the problem
with VIA controllers. I don't have any way to test it since I don't have
any VIA boards (yet).
The worst that might happen is that the controller won't work at all. I
expect things won't be that bad.
Please try the patch and let me know what happens.
Alan Stern
--- 2.6/drivers/usb/host/uhci-hcd.c.orig Sun Feb 8 11:35:24 2004
+++ 2.6/drivers/usb/host/uhci-hcd.c Sat Feb 14 15:57:59 2004
@@ -2199,6 +2199,25 @@
*/
reset_hc(uhci);
pci_write_config_word(hcd->pdev, USBLEGSUP, USBLEGSUP_DEFAULT);
+
+ /* This workaround prevents VIA controllers from shutting themselves
+ * off when they receive a babble packet (I hope).
+ */
+ if (hcd->pdev->vendor == PCI_VENDOR_ID_VIA) {
+ u8 val;
+ int rc;
+
+ rc = pci_read_config_byte(hcd->pdev, 0x40, &val);
+ if (rc == 0 && !(val & 0x40)) {
+ rc = pci_write_config_byte(hcd->pdev, 0x40,
+ val | 0x40);
+ if (rc == 0)
+ info("VIA UHCI babble workaround applied\n");
+ }
+ if (rc)
+ warn("Unable to apply VIA UHCI babble "
+ "workaround: %d\n", rc);
+ }
return 0;
}
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