diff options
author | Marcelo Tosatti <marcelo@kvack.org> | 2007-02-16 09:27:44 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 16:13:58 (GMT) |
commit | 07190a08eef3666a8687070226c8d403c1d548b7 (patch) | |
tree | 20a9f7e9b6bf925a6721f88e438ec551fa8ce992 /kernel/softirq.c | |
parent | 5d8b34fdcb384161552d01ee8f34af5ff11f9684 (diff) | |
download | linux-fsl-qoriq-07190a08eef3666a8687070226c8d403c1d548b7.tar.xz |
[PATCH] Mark TSC on GeodeLX reliable
The Geode can safely use the TSC for highres, since:
1) Does not support frequency scaling,
2) The TSC _does_ count when the CPU is halted. Furthermore, the Geode
supports a mode called "suspension on halt", where Suspend mode (which
interacts with the power management states) is entered. TSC counting
during suspend mode is controlled by bit 8 of the Bus Controller
Configuration Register #0 (thanks Tom!).
3) no SMP :)
Check if "RTSC counts during suspension" and remove the requirement for
verification, so the clocksource code can safely select it as an timesource
for the highres timers subsystem.
Signed-off-by: Marcelo Tosatti <marcelo@kvack.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/softirq.c')
0 files changed, 0 insertions, 0 deletions