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authorAndreas Mohr <[andi@rhlx01.fht-esslingen.de]>2006-06-26 15:58:00 -0400
committerLen Brown <len.brown@intel.com>2006-06-28 03:27:02 -0400
commitb488f02156d3deb08f5ad7816d565c370a8cc6f1 (patch)
tree7ba4c86b66451780a39c28b618dcfa8037584cb2 /include/asm-ia64/serial.h
parent95b38b3f453c16de0f8cddcde3e71050bbfb37b9 (diff)
ACPI: restore comment justifying 'extra' P_LVLx access
While trying to look for superfluous I/O accesses that can be optimized away, I stumbled upon this ACPI sleep I/O access and couldn't figure out why the hell this dummy op was necessary. After more than one hour of internet research, I had collected a sufficient number of documents (among those very old kernel versions) that finally told me what this dummy read was about: STPCLK# doesn't get asserted in time on (some) chipsets, which is why we need to have a dummy I/O read to delay further instruction processing until the CPU is fully stopped. Signed-off-by: Andreas Mohr <andi@lisas.de> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include/asm-ia64/serial.h')
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