The question has been asked many times, and finally I found the
official document which explains the problem of HPET on Baytrail
that it will halt in deep idle states.
Signed-off-by: Feng Tang <feng.t...@intel.com>
---
arch/x86/kernel/early-quirks.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index fe9f0b7..9cdc6acb 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -628,7 +628,10 @@ static struct chipset early_qrk[] __initdata = {
QFLAG_APPLY_ONCE, intel_graphics_stolen },
/*
* HPET on current version of Baytrail platform has accuracy
- * problems, disable it for now:
+ * problems, that it will halt in deep idle state, so disable it.
+ *
+ * Please refer section 18.10.1.3 of
http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/atom-z8000-datasheet-vol-1.pdf
+ * for more details.
*/
{ PCI_VENDOR_ID_INTEL, 0x0f00,
PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
--
1.7.9.5
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