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clocksource: arm_global_timer: Only check for unusable timer on A9

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The check for a usable global timer in the probe code does not enquire
which CPU we are currently running on. This can cause the driver to
incorrectly assume we have an unusable global timer if we are running
on a CPU other than A9.

Before checking the CPU revision, ensure we are running on an A9 CPU.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Matthew Leach <matthew.leach@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Matthew Leach 2014-03-14 10:18:19 +00:00 committed by Daniel Lezcano
parent a798c10faf
commit 2cf2ff9f1f
1 changed files with 3 additions and 2 deletions
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5
drivers/clocksource/arm_global_timer.c
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@ -246,11 +246,12 @@ static void __init global_timer_of_register(struct device_node *np)
int err = 0;
/*
* In r2p0 the comparators for each processor with the global timer
* In A9 r2p0 the comparators for each processor with the global timer
* fire when the timer value is greater than or equal to. In previous
* revisions the comparators fired when the timer value was equal to.
*/
if ((read_cpuid_id() & 0xf0000f) < 0x200000) {
if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9
&& (read_cpuid_id() & 0xf0000f) < 0x200000) {
pr_warn("global-timer: non support for this cpu version.\n");
return;
}