kernel-ark/arch
Linus Torvalds a6a80e1d8c Fix potential fast PIT TSC calibration startup glitch
During bootup, when we reprogram the PIT (programmable interval timer)
to start counting down from 0xffff in order to use it for the fast TSC
calibration, we should also make sure to delay a bit afterwards to allow
the PIT hardware to actually start counting with the new value.

That will happens at the next CLK pulse (1.193182 MHz), so the easiest
way to do that is to just wait at least one microsecond after
programming the new PIT counter value.  We do that by just reading the
counter value back once - which will take about 2us on PC hardware.

Reported-and-tested-by: john stultz <johnstul@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-17 07:58:26 -07:00
..
alpha cpumask: Use cpu_*_mask accessors code: alpha 2009-02-16 17:32:00 +10:30
arm Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-03-15 13:34:56 -07:00
avr32 [ARM] 5400/1: Add support for inverted rdy_busy pin for Atmel nand device controller 2009-02-16 21:40:39 +00:00
blackfin Blackfin arch: SPI_MMC is now mainlined MMC_SPI 2009-03-06 00:27:57 +08:00
cris
frv FRV: in_interrupt() requires #inclusion of linux/hardirq.h not asm/hardirq.h now 2009-02-09 08:51:35 -08:00
h8300
ia64 [IA64] fix PCI DMA flag propagation on SN (Altix) with PICs 2009-03-06 10:41:13 -08:00
m32r
m68k m68k: atari - Rename "mfp" to "st_mfp" 2009-02-22 09:23:02 -08:00
m68knommu m68knommu: m528x build fix 2009-03-10 15:55:12 -07:00
mips MIPS: Mark Eins: Fix configuration. 2009-03-13 23:08:00 +01:00
mn10300 mn10300: fix typo && -> || in arch/mn10300/unit-asb2305/pci.c 2009-02-20 17:57:48 -08:00
parisc parisc: update defconfigs 2009-03-13 01:33:34 -04:00
powerpc Merge commit 'gcl/merge' into merge 2009-03-11 10:40:29 +11:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2009-03-03 17:05:08 -08:00
sh sh: Add media/soc_camera.h to board setup of Renesas AP325RXA 2009-03-10 15:20:54 +09:00
sparc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 2009-03-12 09:27:53 -07:00
um uml: fix WARNING: vmlinux: 'memcpy' exported twice 2009-03-12 16:20:23 -07:00
x86 Fix potential fast PIT TSC calibration startup glitch 2009-03-17 07:58:26 -07:00
xtensa xtensa: fix compilation somewhat 2009-03-10 15:55:10 -07:00
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