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| author | Paul Walmsley <paul@pwsan.com> | 2011-01-16 07:32:01 +0300 |
|---|---|---|
| committer | Paul Walmsley <paul@pwsan.com> | 2011-01-18 22:04:12 +0300 |
| commit | d8328f3b85f34c0dc5866f10bf6e7842fb511d62 (patch) | |
| tree | cce2477423a170a77d0ca7364fb0f2329038220c /arch/arm/mach-omap1/time.c | |
| parent | e78bf5e6cbe837daa6ab628a5f679548742994d3 (diff) | |
| download | linux-d8328f3b85f34c0dc5866f10bf6e7842fb511d62.tar.xz | |
OMAP: counter_32k: init clocksource as part of machine timer init
After commit dc548fbbd2ecd0fc3b02301d551e5f8e19ae58fd ("ARM: omap: convert
sched_clock() to use new infrastructure"), OMAPs that use the 32KiHz
"synchronization timer" as their clocksource crash during boot:
[ 0.000000] OMAP clockevent source: GPTIMER1 at 32768 Hz
[ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 0.000000] pgd = c0004000
[ 0.000000] [00000000] *pgd=00000000
[ 0.000000] Internal error: Oops: 80000005 [#1] SMP
[ 0.000000] last sysfs file:
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 Tainted: G W (2.6.37-07734-g2467802 #7)
[ 0.000000] PC is at 0x0
[ 0.000000] LR is at sched_clock_poll+0x2c/0x3c
[ 0.000000] pc : [<00000000>] lr : [<c0060b74>] psr: 600001d3
[ 0.000000] sp : c058bfd0 ip : c058a000 fp : 00000000
[ 0.000000] r10: 00000000 r9 : 411fc092 r8 : 800330c8
[ 0.000000] r7 : c05a08e0 r6 : c0034c48 r5 : c05ffc40 r4 : c0034c4c
[ 0.000000] r3 : c05ffe6c r2 : c05a0bc0 r1 : c059f098 r0 : 00000000
[ 0.000000] Flags: nZCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel
[ 0.000000] Control: 10c53c7f Table: 8000404a DAC: 00000017
This is due to the recent ARM init_sched_clock() changes and the late
initialization of the counter_32k clock source. More information here:
http://marc.info/?l=linux-omap&m=129513468605208&w=2
Fix by initializing the counter_32k clocksource during the machine timer
initialization.
Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap1/time.c')
| -rw-r--r-- | arch/arm/mach-omap1/time.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c index ed7a61ff916a..6ec65e599997 100644 --- a/arch/arm/mach-omap1/time.c +++ b/arch/arm/mach-omap1/time.c @@ -244,6 +244,13 @@ static void __init omap_timer_init(void) omap_init_mpu_timer(rate); omap_init_clocksource(rate); + /* + * XXX Since this file seems to deal mostly with the MPU timer, + * this doesn't seem like the correct place for the sync timer + * clocksource init. + */ + if (!cpu_is_omap7xx() && !cpu_is_omap15xx()) + omap_init_clocksource_32k(); } struct sys_timer omap_timer = { |