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path: root/drivers/pnp/quirks.c
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Diffstat (limited to 'drivers/pnp/quirks.c')
-rw-r--r--drivers/pnp/quirks.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index e903b8c2b1fa..37993206ae5d 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -108,6 +108,77 @@ static void quirk_sb16audio_resources(struct pnp_dev *dev)
"pnp: SB audio device quirk - increasing port range\n");
}
+
+#include <linux/pci.h>
+
+static void quirk_system_pci_resources(struct pnp_dev *dev)
+{
+ struct pci_dev *pdev = NULL;
+ resource_size_t pnp_start, pnp_end, pci_start, pci_end;
+ int i, j;
+
+ /*
+ * Some BIOSes have PNP motherboard devices with resources that
+ * partially overlap PCI BARs. The PNP system driver claims these
+ * motherboard resources, which prevents the normal PCI driver from
+ * requesting them later.
+ *
+ * This patch disables the PNP resources that conflict with PCI BARs
+ * so they won't be claimed by the PNP system driver.
+ */
+ for_each_pci_dev(pdev) {
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM) ||
+ pci_resource_len(pdev, i) == 0)
+ continue;
+
+ pci_start = pci_resource_start(pdev, i);
+ pci_end = pci_resource_end(pdev, i);
+ for (j = 0; j < PNP_MAX_MEM; j++) {
+ if (!pnp_mem_valid(dev, j) ||
+ pnp_mem_len(dev, j) == 0)
+ continue;
+
+ pnp_start = pnp_mem_start(dev, j);
+ pnp_end = pnp_mem_end(dev, j);
+
+ /*
+ * If the PNP region doesn't overlap the PCI
+ * region at all, there's no problem.
+ */
+ if (pnp_end < pci_start || pnp_start > pci_end)
+ continue;
+
+ /*
+ * If the PNP region completely encloses (or is
+ * at least as large as) the PCI region, that's
+ * also OK. For example, this happens when the
+ * PNP device describes a bridge with PCI
+ * behind it.
+ */
+ if (pnp_start <= pci_start &&
+ pnp_end >= pci_end)
+ continue;
+
+ /*
+ * Otherwise, the PNP region overlaps *part* of
+ * the PCI region, and that might prevent a PCI
+ * driver from requesting its resources.
+ */
+ dev_warn(&dev->dev, "mem resource "
+ "(0x%llx-0x%llx) overlaps %s BAR %d "
+ "(0x%llx-0x%llx), disabling\n",
+ (unsigned long long) pnp_start,
+ (unsigned long long) pnp_end,
+ pci_name(pdev), i,
+ (unsigned long long) pci_start,
+ (unsigned long long) pci_end);
+ pnp_mem_flags(dev, j) = 0;
+ }
+ }
+ }
+}
+
/*
* PnP Quirks
* Cards or devices that need some tweaking due to incomplete resource info
@@ -128,6 +199,8 @@ static struct pnp_fixup pnp_fixups[] = {
{"CTL0043", quirk_sb16audio_resources},
{"CTL0044", quirk_sb16audio_resources},
{"CTL0045", quirk_sb16audio_resources},
+ {"PNP0c01", quirk_system_pci_resources},
+ {"PNP0c02", quirk_system_pci_resources},
{""}
};