b488f02156
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> |
||
|---|---|---|
| .. | ||
| dispatcher | ||
| events | ||
| executer | ||
| hardware | ||
| namespace | ||
| parser | ||
| resources | ||
| sleep | ||
| tables | ||
| utilities | ||
| ac.c | ||
| acpi_memhotplug.c | ||
| asus_acpi.c | ||
| battery.c | ||
| blacklist.c | ||
| bus.c | ||
| button.c | ||
| container.c | ||
| debug.c | ||
| dock.c | ||
| ec.c | ||
| event.c | ||
| fan.c | ||
| glue.c | ||
| hotkey.c | ||
| ibm_acpi.c | ||
| Kconfig | ||
| Makefile | ||
| motherboard.c | ||
| numa.c | ||
| osl.c | ||
| pci_bind.c | ||
| pci_irq.c | ||
| pci_link.c | ||
| pci_root.c | ||
| power.c | ||
| processor_core.c | ||
| processor_idle.c | ||
| processor_perflib.c | ||
| processor_thermal.c | ||
| processor_throttling.c | ||
| scan.c | ||
| system.c | ||
| tables.c | ||
| thermal.c | ||
| toshiba_acpi.c | ||
| utils.c | ||
| video.c | ||