Messages in this thread Patch in this message |  | | Date | Wed, 14 Feb 2007 15:05:24 +0000 | From | "Jan Beulich" <> | Subject | [PATCH, RFC] adjust legacy IDE resource setting |
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The change to force legacy mode IDE channels' resources to fixed non-zero values confuses (at least some versions of) X, because the values reported by the kernel and those readable from PCI config space aren't consistent anymore. Therefore, this patch arranges for the respective BARs to also get updated if possible.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- linux-2.6.20/drivers/pci/probe.c 2007-02-04 19:44:54.000000000 +0100 +++ 2.6.20-pci-ide-legacy/drivers/pci/probe.c 2007-02-14 15:54:58.000000000 +0100 @@ -639,7 +639,29 @@ static void pci_read_irq(struct pci_dev dev->irq = irq; } -#define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) +static void change_legacy_io_resource(struct pci_dev * dev, unsigned index, + unsigned start, unsigned end) +{ + unsigned base = start & PCI_BASE_ADDRESS_IO_MASK; + unsigned len = (end | ~PCI_BASE_ADDRESS_IO_MASK) - base + 1; + + if (!(pci_resource_flags(dev, index) & IORESOURCE_IO)) + printk(KERN_WARNING "%s: cannot adjust BAR%u (not I/O)\n", + pci_name(dev), index); + else if (pci_resource_len(dev, index) != len) + printk(KERN_WARNING "%s: cannot adjust BAR%u (size %04X)\n", + pci_name(dev), index, (unsigned)pci_resource_len(dev, index)); + else { + printk(KERN_INFO "%s: trying to change BAR%u from %04X to %04X\n", + pci_name(dev), index, + (unsigned)pci_resource_start(dev, index), base); + pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + index * 4, base); + } + pci_resource_start(dev, index) = start; + pci_resource_end(dev, index) = end; + pci_resource_flags(dev, index) = + IORESOURCE_IO | IORESOURCE_PCI_FIXED | PCI_BASE_ADDRESS_SPACE_IO; +} /** * pci_setup_device - fill in class and map information of a device @@ -692,20 +714,12 @@ static int pci_setup_device(struct pci_d u8 progif; pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); if ((progif & 1) == 0) { - dev->resource[0].start = 0x1F0; - dev->resource[0].end = 0x1F7; - dev->resource[0].flags = LEGACY_IO_RESOURCE; - dev->resource[1].start = 0x3F6; - dev->resource[1].end = 0x3F6; - dev->resource[1].flags = LEGACY_IO_RESOURCE; + change_legacy_io_resource(dev, 0, 0x1F0, 0x1F7); + change_legacy_io_resource(dev, 1, 0x3F6, 0x3F6); } if ((progif & 4) == 0) { - dev->resource[2].start = 0x170; - dev->resource[2].end = 0x177; - dev->resource[2].flags = LEGACY_IO_RESOURCE; - dev->resource[3].start = 0x376; - dev->resource[3].end = 0x376; - dev->resource[3].flags = LEGACY_IO_RESOURCE; + change_legacy_io_resource(dev, 2, 0x170, 0x177); + change_legacy_io_resource(dev, 3, 0x376, 0x376); } } break;
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