The patch titled
Force enable HPET on VT8235/8237 chipsets
has been added to the -mm tree. Its filename is
hpet-force-enable-on-vt8235-37-chipsets.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Force enable HPET on VT8235/8237 chipsets
From: "Udo A. Steinberg" <us15@xxxxxxxxxxxxxxxxxxxx>
This patch adds quirks to force enable HPET on Via VT8235 and VT8237 chipse=
ts. The datasheet for 8237 documents HPET functionality (although wrongly)
wher= eas HPET is undocumented for 8235.
Tested on A7V880 (8237) and K7VT4A+ (8235) boards.
Signed-off-by: Udo A. Steinberg <us15@xxxxxxxxxxxxxxxxxxxx>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: john stultz <johnstul@xxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/quirks.c | 68 +++++++++++++++++++++++++++++++++++-
1 files changed, 67 insertions(+), 1 deletion(-)
diff -puN arch/i386/kernel/quirks.c~hpet-force-enable-on-vt8235-37-chipsets arch/i386/kernel/quirks.c
--- a/arch/i386/kernel/quirks.c~hpet-force-enable-on-vt8235-37-chipsets
+++ a/arch/i386/kernel/quirks.c
@@ -56,7 +56,8 @@ unsigned long force_hpet_address;
static enum {
NONE_FORCE_HPET_RESUME,
OLD_ICH_FORCE_HPET_RESUME,
- ICH_FORCE_HPET_RESUME
+ ICH_FORCE_HPET_RESUME,
+ VT8237_FORCE_HPET_RESUME
} force_hpet_resume_type;
static void __iomem *rcba_base;
@@ -245,6 +246,68 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_I
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
old_ich_force_enable_hpet);
+
+static void vt8237_force_hpet_resume(void)
+{
+ u32 val;
+
+ if (!force_hpet_address || !cached_dev)
+ return;
+
+ val = 0xfed00000 | 0x80;
+ pci_write_config_dword(cached_dev, 0x68, val);
+
+ pci_read_config_dword(cached_dev, 0x68, &val);
+ if (val & 0x80)
+ printk(KERN_DEBUG "Force enabled HPET at resume\n");
+ else
+ BUG();
+}
+
+static void vt8237_force_enable_hpet(struct pci_dev *dev)
+{
+ u32 val;
+
+ if (hpet_address || force_hpet_address)
+ return;
+
+ pci_read_config_dword(dev, 0x68, &val);
+ /*
+ * Bit 7 is HPET enable bit.
+ * Bit 31:10 is HPET base address (contrary to what datasheet claims)
+ */
+ if (val & 0x80) {
+ force_hpet_address = (val & ~0x3ff);
+ printk(KERN_DEBUG "HPET at base address 0x%lx\n",
+ force_hpet_address);
+ return;
+ }
+
+ /*
+ * HPET is disabled. Trying enabling at FED00000 and check
+ * whether it sticks
+ */
+ val = 0xfed00000 | 0x80;
+ pci_write_config_dword(dev, 0x68, val);
+
+ pci_read_config_dword(dev, 0x68, &val);
+ if (val & 0x80) {
+ force_hpet_address = (val & ~0x3ff);
+ printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n",
+ force_hpet_address);
+ cached_dev = dev;
+ force_hpet_resume_type = VT8237_FORCE_HPET_RESUME;
+ return;
+ }
+
+ printk(KERN_DEBUG "Failed to force enable HPET\n");
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
+ vt8237_force_enable_hpet);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
+ vt8237_force_enable_hpet);
+
void force_hpet_resume(void)
{
switch (force_hpet_resume_type) {
@@ -254,6 +317,9 @@ void force_hpet_resume(void)
case OLD_ICH_FORCE_HPET_RESUME:
return old_ich_force_hpet_resume();
+ case VT8237_FORCE_HPET_RESUME:
+ return vt8237_force_hpet_resume();
+
default:
break;
}
_
Patches currently in -mm which might be from us15@xxxxxxxxxxxxxxxxxxxx are
hpet-force-enable-on-ich34.patch
hpet-force-enable-on-vt8235-37-chipsets.patch
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