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(parent: f767625) | patch
x86: HPET: read back compare register before reading counter
authorThomas Gleixner <tglx@linutronix.de>
Sat, 6 Sep 2008 01:06:08 +0000 (03:06 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Sat, 6 Sep 2008 05:21:17 +0000 (07:21 +0200)
commit72d43d9bc9210d24d09202eaf219eac09e17b339
tree0ec1d67060e32ad3e2b3772d0c0cb33a8809b594tree | snapshot
parentf7676254f179eac6b5244a80195ec8ae0e9d4606commit | diff
x86: HPET: read back compare register before reading counter

After fixing the u32 thinko I sill had occasional hickups on ATI chipsets
with small deltas. There seems to be a delay between writing the compare
register and the transffer to the internal register which triggers the
interrupt. Reading back the value makes sure, that it hit the internal
match register befor we compare against the counter value.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
arch/x86/kernel/hpet.c diff | blob | history
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