4 files changed, 56 insertions, 16 deletions

diff --git a/arch/arm/mach-ep93xx/ts72xx.c b/arch/arm/mach-ep93xx/ts72xx.c
index 9be01b0c3f48..e24566b88a78 100644
--- a/arch/arm/mach-ep93xx/ts72xx.c
+++ b/arch/arm/mach-ep93xx/ts72xx.c
@@ -111,21 +111,21 @@ static void __init ts72xx_map_io(void)
         }
 }
 
-static unsigned char ts72xx_rtc_readb(unsigned long addr)
+static unsigned char ts72xx_rtc_readbyte(unsigned long addr)
 {
         __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
         return __raw_readb(TS72XX_RTC_DATA_VIRT_BASE);
 }
 
-static void ts72xx_rtc_writeb(unsigned char value, unsigned long addr)
+static void ts72xx_rtc_writebyte(unsigned char value, unsigned long addr)
 {
         __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
         __raw_writeb(value, TS72XX_RTC_DATA_VIRT_BASE);
 }
 
 static struct m48t86_ops ts72xx_rtc_ops = {
-        .readb                  = ts72xx_rtc_readb,
-        .writeb                 = ts72xx_rtc_writeb,
+        .readbyte               = ts72xx_rtc_readbyte,
+        .writebyte              = ts72xx_rtc_writebyte,
 };
 
 static struct platform_device ts72xx_rtc_device = {
diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c
index 2e3b643a4dc4..1649a175a206 100644
--- a/arch/i386/kernel/acpi/earlyquirk.c
+++ b/arch/i386/kernel/acpi/earlyquirk.c
@@ -5,17 +5,34 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
+#include <linux/acpi.h>
+
 #include <asm/pci-direct.h>
 #include <asm/acpi.h>
 #include <asm/apic.h>
 
+#ifdef CONFIG_ACPI
+
+static int nvidia_hpet_detected __initdata;
+
+static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
+{
+        nvidia_hpet_detected = 1;
+        return 0;
+}
+#endif
+
 static int __init check_bridge(int vendor, int device)
 {
 #ifdef CONFIG_ACPI
-        /* According to Nvidia all timer overrides are bogus. Just ignore
-           them all. */
+        /* According to Nvidia all timer overrides are bogus unless HPET
+           is enabled. */
         if (vendor == PCI_VENDOR_ID_NVIDIA) {
-                acpi_skip_timer_override = 1;
+                nvidia_hpet_detected = 0;
+                acpi_table_parse(ACPI_HPET, nvidia_hpet_check);
+                if (nvidia_hpet_detected == 0) {
+                        acpi_skip_timer_override = 1;
+                }
         }
 #endif
         if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 846e1639ef7c..dd6b0e3386ce 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1547,15 +1547,18 @@ void __init setup_arch(char **cmdline_p)
         if (efi_enabled)
                 efi_map_memmap();
 
-#ifdef CONFIG_X86_IO_APIC
-        check_acpi_pci();       /* Checks more than just ACPI actually */
-#endif
-
 #ifdef CONFIG_ACPI
         /*
          * Parse the ACPI tables for possible boot-time SMP configuration.
          */
         acpi_boot_table_init();
+#endif
+
+#ifdef CONFIG_X86_IO_APIC
+        check_acpi_pci();       /* Checks more than just ACPI actually */
+#endif
+
+#ifdef CONFIG_ACPI
         acpi_boot_init();
 
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 0de3ea938830..9cc7031b7151 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -271,6 +271,18 @@ __setup("enable_8254_timer", setup_enable_8254_timer);
 #include <linux/pci_ids.h>
 #include <linux/pci.h>
 
+
+#ifdef CONFIG_ACPI
+
+static int nvidia_hpet_detected __initdata;
+
+static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
+{
+        nvidia_hpet_detected = 1;
+        return 0;
+}
+#endif
+
 /* Temporary Hack. Nvidia and VIA boards currently only work with IO-APIC
    off. Check for an Nvidia or VIA PCI bridge and turn it off.
    Use pci direct infrastructure because this runs before the PCI subsystem. 
@@ -317,11 +329,19 @@ void __init check_ioapic(void)
                                         return;
                                 case PCI_VENDOR_ID_NVIDIA:
 #ifdef CONFIG_ACPI
-                                        /* All timer overrides on Nvidia
-                                           seem to be wrong. Skip them. */
-                                        acpi_skip_timer_override = 1;
-                                        printk(KERN_INFO 
-             "Nvidia board detected. Ignoring ACPI timer override.\n");
+                                        /*
+                                         * All timer overrides on Nvidia are
+                                         * wrong unless HPET is enabled.
+                                         */
+                                        nvidia_hpet_detected = 0;
+                                        acpi_table_parse(ACPI_HPET,
+                                                        nvidia_hpet_check);
+                                        if (nvidia_hpet_detected == 0) {
+                                                acpi_skip_timer_override = 1;
+                                                printk(KERN_INFO "Nvidia board "
+                                                    "detected. Ignoring ACPI "
+                                                    "timer override.\n");
+                                        }
 #endif
                                         /* RED-PEN skip them on mptables too? */
                                         return;