1 files changed, 43 insertions, 1 deletions

diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index b3296cc2f2f2..37a770859e71 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -52,7 +52,8 @@
 #define ONE_BASED_CHASSIS_NUM   1
 
 /* register offsets inside the host bridge space */
-#define PHB_CSR_OFFSET          0x0110
+#define CALGARY_CONFIG_REG      0x0108
+#define PHB_CSR_OFFSET          0x0110 /* Channel Status */
 #define PHB_PLSSR_OFFSET        0x0120
 #define PHB_CONFIG_RW_OFFSET    0x0160
 #define PHB_IOBASE_BAR_LOW      0x0170
@@ -83,6 +84,8 @@
 #define TAR_VALID               0x0000000000000008UL
 /* CSR (Channel/DMA Status Register) */
 #define CSR_AGENT_MASK          0xffe0ffff
+/* CCR (Calgary Configuration Register) */
+#define CCR_2SEC_TIMEOUT        0x000000000000000EUL
 
 #define MAX_NUM_OF_PHBS         8 /* how many PHBs in total? */
 #define MAX_NUM_CHASSIS         8 /* max number of chassis */
@@ -732,6 +735,38 @@ static void calgary_watchdog(unsigned long data)
         }
 }
 
+static void __init calgary_increase_split_completion_timeout(void __iomem *bbar,
+        unsigned char busnum)
+{
+        u64 val64;
+        void __iomem *target;
+        unsigned long phb_shift = -1;
+        u64 mask;
+
+        switch (busno_to_phbid(busnum)) {
+        case 0: phb_shift = (63 - 19);
+                break;
+        case 1: phb_shift = (63 - 23);
+                break;
+        case 2: phb_shift = (63 - 27);
+                break;
+        case 3: phb_shift = (63 - 35);
+                break;
+        default:
+                BUG_ON(busno_to_phbid(busnum));
+        }
+
+        target = calgary_reg(bbar, CALGARY_CONFIG_REG);
+        val64 = be64_to_cpu(readq(target));
+
+        /* zero out this PHB's timer bits */
+        mask = ~(0xFUL << phb_shift);
+        val64 &= mask;
+        val64 |= (CCR_2SEC_TIMEOUT << phb_shift);
+        writeq(cpu_to_be64(val64), target);
+        readq(target); /* flush */
+}
+
 static void __init calgary_enable_translation(struct pci_dev *dev)
 {
         u32 val32;
@@ -756,6 +791,13 @@ static void __init calgary_enable_translation(struct pci_dev *dev)
         writel(cpu_to_be32(val32), target);
         readl(target); /* flush */
 
+        /*
+         * Give split completion a longer timeout on bus 1 for aic94xx
+         * http://bugzilla.kernel.org/show_bug.cgi?id=7180
+         */
+        if (busnum == 1)
+                calgary_increase_split_completion_timeout(bbar, busnum);
+
         init_timer(&tbl->watchdog_timer);
         tbl->watchdog_timer.function = &calgary_watchdog;
         tbl->watchdog_timer.data = (unsigned long)dev;