ar71xx: remove useless irq_desc.status initializations

[openwrt.git] / target / linux / ar71xx / files / arch / mips / pci / pci-ar71xx.c

diff --git a/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c b/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c
index c6c6e55..1014acc 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c
+++ b/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c
@@ -136,6 +136,7 @@ static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
        static u32 mask[8] = {0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0};
        unsigned long flags;
        u32 data;
+       int retry = 0;
        int ret;
 
        ret = PCIBIOS_SUCCESSFUL;
@@ -143,6 +144,7 @@ static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
        DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d\n", bus->number,
                        PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
 
+retry:
        spin_lock_irqsave(&ar71xx_pci_lock, flags);
 
        if (bus->number == 0 && devfn == 0) {
@@ -176,6 +178,14 @@ static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 
        *value = (data >> (8 * (where & 3))) & mask[size & 7];
 
+       /*
+        * PCI controller bug: sometimes reads to the PCI_COMMAND register
+        * return 0xffff, even though the PCI trace shows the correct value.
+        * Work around this by retrying reads to this register
+        */
+       if (where == PCI_COMMAND && (*value & 0xffff) == 0xffff && retry++ < 2)
+               goto retry;
+
        return ret;
 }
 
@@ -363,11 +373,9 @@ static void __init ar71xx_pci_irq_init(void)
        __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
 
        for (i = AR71XX_PCI_IRQ_BASE;
-            i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++) {
-               irq_desc[i].status = IRQ_DISABLED;
+            i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++)
                set_irq_chip_and_handler(i, &ar71xx_pci_irq_chip,
                                         handle_level_irq);
-       }
 
        set_irq_chained_handler(AR71XX_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
 }