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SubjectRe: [PATCH v9 4/9] clocksource/drivers/arm_arch_timer: use readq to get 64-bit CNTVCT
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Will Deacon wrote:
>> > {
>> >- u32 vct_lo, vct_hi, tmp_hi;
>> >-
>> >- do {
>> >- vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI);
>> >- vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO);
>> >- tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI);
>> >- } while (vct_hi != tmp_hi);
>> >-
>> >- return ((u64) vct_hi << 32) | vct_lo;
>> >+ return readq(arch_counter_base + CNTVCT_LO);
> Please drop this patch. It doesn't work.

On systems where readq() does work, wouldn't it be more optimal than the
above while-loop?

--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, hosted by The Linux Foundation.

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