iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
118,563 Commits 104 Branches 1,843 Tags
Commit Graph

4 Commits

Author SHA1 Message Date
Ralf Baechle
8dfa741f14 [MIPS] Sibyte: Stop timers before programming next even. 
We have no guarantee by the generic time code that the timer is stopped
when the ->next_event method is called.  Modifying the Timer Initial Count
register while the timer is enabled has UNPREDICTABLE effect according to
the BCM1250/BCM1125/BCM1125H User Manual.  So stop the timer before
reprogramming.

This is a paranoia fix; no ill effects have been observed previously.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2007-11-15 23:21:50 +00:00
Ralf Baechle
622477533d [MIPS] Sibyte: Increase minimum oneshot timer interval to two ticks. 
For the old minimum of a single tick a value of zero would be programmed
into the init value register which in the BCM1250/BCM1125/BCM1125H User
Manual in the Timer Special Cases section is documented to have
UNPREDICTABLE effect.

Observable sympthoms of this bug were hangs of several seconds on the
console during bootup and later if both dyntick and highres timer options
were activated.

In theory contiguous mode of the timers is also affected but in an act of
hopeless lack of realism I'll assume nobody will ever configure a KERNEL
for HZ > 500kHz but if so I leave that to evolution to sort out.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2007-11-15 23:21:50 +00:00
Ralf Baechle
07a80e4924 [MIPS] Sibyte: pin timer interrupt to their cores. 
Or strange things will happen.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2007-11-15 23:21:48 +00:00
Ralf Baechle
217dd11e9d [MIPS] Sibyte: Split and move clock code. 
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2007-11-02 16:13:47 +00:00