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x86/hpet: Simplify counter validation

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There is no point to loop for 200k TSC cycles to check afterwards whether
the HPET counter is working. Read the counter inside of the loop and break
out when the counter value changed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Link: https://lkml.kernel.org/r/20190623132435.149535103@linutronix.de
This commit is contained in:
Thomas Gleixner
2019-06-23 15:23:52 +02:00
parent 3222daf970
commit 44b5be5733
1 changed files with 4 additions and 6 deletions
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10
arch/x86/kernel/hpet.c
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@@ -853,15 +853,13 @@ static bool __init hpet_counting(void)
* 1 GHz == 200us
*/
do {
rep_nop();
if (t1 != hpet_readl(HPET_COUNTER))
return true;
now = rdtsc();
} while ((now - start) < 200000UL);
if (t1 == hpet_readl(HPET_COUNTER)) {
pr_warn("Counter not counting. HPET disabled\n");
return false;
}
return true;
pr_warn("Counter not counting. HPET disabled\n");
return false;
}
/**