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clocksource/drivers/imx-tpm: Exclude sched clock for ARM64

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For ARM64 platform such as i.MX8ULP which has ARMv8 generic timer as sched
clock, which is much faster compared with tpm sched clock. Reading the
tpm count register in i.MX8ULP requires about 290ns, this is slow and
introduce scheduler latency. So exclude tpm sched clock for ARM64
platform.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20220105124304.3567629-1-peng.fan@oss.nxp.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Peng Fan 2022-01-05 20:43:04 +08:00 committed by Daniel Lezcano
parent e547ffe9e6
commit 10720e120e
1 changed files with 1 additions and 1 deletions
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2
drivers/clocksource/timer-imx-tpm.c
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@ -150,10 +150,10 @@ static int __init tpm_clocksource_init(void)
tpm_delay_timer.read_current_timer = &tpm_read_current_timer;
tpm_delay_timer.freq = timer_of_rate(&to_tpm) >> 3;
register_current_timer_delay(&tpm_delay_timer);
#endif
sched_clock_register(tpm_read_sched_clock, counter_width,
timer_of_rate(&to_tpm) >> 3);
#endif
return clocksource_mmio_init(timer_base + TPM_CNT,
"imx-tpm",