Re: [ACPI] Re: Fw: Anybody? 2.6.11 (stable and -rc) ACPI breaks USB

[Bjorn Helgaas]

On Sun, 2005-03-13 at 16:14 +0100, Grzegorz Kulewski wrote:
> On Fri, 11 Mar 2005, Bjorn Helgaas wrote:
> > So here's another patch to try (revert the first one, then apply this).
> >
> > ===== drivers/acpi/pci_irq.c 1.37 vs edited =====
> > --- 1.37/drivers/acpi/pci_irq.c	2005-03-01 09:57:29 -07:00
> > +++ edited/drivers/acpi/pci_irq.c	2005-03-11 15:13:49 -07:00
> > @@ -438,10 +439,17 @@
> > 		}
> >  	}
> >
> > -	if (via_interrupt_line_quirk)
> > -		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq & 15);
> > -
> > 	dev->irq = acpi_register_gsi(irq, edge_level, active_high_low);
> > +
> > +	if (dev->vendor == PCI_VENDOR_ID_VIA) {
> > +		u8 old_irq, new_irq = dev->irq & 0xf;
> > +
> > +		pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &old_irq);
> > +		printk(KERN_INFO PREFIX "Via IRQ fixup for %s, from %d "
> > +			"to %d\n", pci_name(dev), old_irq, new_irq);
> > +		udelay(15);
> > +		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, new_irq);
> > +	}
> >
> > 	printk(KERN_INFO PREFIX "PCI interrupt %s[%c] -> GSI %u "
> > 		"(%s, %s) -> IRQ %d\n",
> >

> Ok, this patch works. Here is the log:
> Mar 13 17:16:17 kangur USB Universal Host Controller Interface driver v2.2
> Mar 13 17:16:17 kangur ACPI: Via IRQ fixup for 0000:00:07.2, from 9 to 10
> Mar 13 17:16:17 kangur ACPI: PCI interrupt 0000:00:07.2[D] -> GSI 10 
> (level, low) -> IRQ 10
> Mar 13 17:16:17 kangur uhci_hcd 0000:00:07.2: UHCI Host Controller
> Mar 13 17:16:17 kangur uhci_hcd 0000:00:07.2: irq 10, io base 0xc800
> Mar 13 17:16:17 kangur uhci_hcd 0000:00:07.2: new USB bus registered, 
> assigned bus number 1
> Mar 13 17:16:17 kangur hub 1-0:1.0: USB hub found
> Mar 13 17:16:17 kangur hub 1-0:1.0: 2 ports detected
> Mar 13 17:16:17 kangur ACPI: Via IRQ fixup for 0000:00:07.3, from 9 to 10
> Mar 13 17:16:17 kangur ACPI: PCI interrupt 0000:00:07.3[D] -> GSI 10 
> (level, low) -> IRQ 10

> To me everything works (at least now). Can this patch be pushed into 
> 2.6.12 and/or 2.6.11.4 fast?

The patch I sent you was just for debugging -- I think we can come
up with a cleaner fix.

I think the INTERRUPT_LINE write should actually happen in a
pci_enable_device() fixup.  Then we could get rid of all gunk
in pirq_enable_irq() and acpi_pci_irq_enable().

Something like the following will probably work for you, Grzegorz,
but I expect that it won't be enough for somebody with a Via
northbridge.

The previous quirk_via_bridge() says "if the system contains any
Via device with devfn==0, then do the INTERRUPT_LINE fixup for
every PCI device in the system, regardless of what the Via
device is or where it is relative to the current device."

That seems awfully suspicious to me.  So the following is
probably safe as far as it goes, but not sufficient for all
cases.

Shaohua, Len, Zwane?  This is related to 
    http://bugzilla.kernel.org/show_bug.cgi?id=3319

===== arch/i386/pci/irq.c 1.55 vs edited =====
--- 1.55/arch/i386/pci/irq.c	2005-02-07 22:39:15 -07:00
+++ edited/arch/i386/pci/irq.c	2005-03-15 10:11:44 -07:00
@@ -1026,7 +1026,6 @@
 static int pirq_enable_irq(struct pci_dev *dev)
 {
 	u8 pin;
-	extern int via_interrupt_line_quirk;
 	struct pci_dev *temp_dev;
 
 	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
@@ -1081,10 +1080,6 @@
 		printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
 		       'A' + pin, pci_name(dev), msg);
 	}
-	/* VIA bridges use interrupt line for apic/pci steering across
-	   the V-Link */
-	else if (via_interrupt_line_quirk)
-		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq & 15);
 	return 0;
 }
 
===== drivers/acpi/pci_irq.c 1.37 vs edited =====
--- 1.37/drivers/acpi/pci_irq.c	2005-03-01 09:57:29 -07:00
+++ edited/drivers/acpi/pci_irq.c	2005-03-15 10:10:57 -07:00
@@ -388,7 +388,6 @@
 	u8			pin = 0;
 	int			edge_level = ACPI_LEVEL_SENSITIVE;
 	int			active_high_low = ACPI_ACTIVE_LOW;
-	extern int		via_interrupt_line_quirk;
 
 	ACPI_FUNCTION_TRACE("acpi_pci_irq_enable");
 
@@ -437,9 +436,6 @@
 			return_VALUE(0);
 		}
  	}
-
-	if (via_interrupt_line_quirk)
-		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq & 15);
 
 	dev->irq = acpi_register_gsi(irq, edge_level, active_high_low);
 
===== drivers/pci/quirks.c 1.72 vs edited =====
--- 1.72/drivers/pci/quirks.c	2005-03-10 01:38:25 -07:00
+++ edited/drivers/pci/quirks.c	2005-03-15 12:15:00 -07:00
@@ -683,19 +683,23 @@
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_82454NX,	quirk_disable_pxb );
 
-/*
- *	VIA northbridges care about PCI_INTERRUPT_LINE
- */
-int via_interrupt_line_quirk;
-
-static void __devinit quirk_via_bridge(struct pci_dev *pdev)
+static void __devinit quirk_via_irqpic(struct pci_dev *dev)
 {
-	if(pdev->devfn == 0) {
-		printk(KERN_INFO "PCI: Via IRQ fixup\n");
-		via_interrupt_line_quirk = 1;
+	u8 irq, new_irq = dev->irq & 0xf;
+
+	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
+	if (new_irq != irq) {
+		printk(KERN_INFO "PCI: Via IRQ fixup for %s, from %d to %d\n",
+			pci_name(dev), irq, new_irq);
+		udelay(15);
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, new_irq);
 	}
 }
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_ANY_ID,                     quirk_via_bridge );
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2, quirk_via_irqpic);
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5, quirk_via_irqpic);
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_6, quirk_via_irqpic);
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_5,   quirk_via_irqpic);
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_7,   quirk_via_irqpic);
 
 /*
  *	Serverworks CSB5 IDE does not fully support native mode


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