Commit 10720e12 authored by Peng Fan's avatar Peng Fan Committed by Daniel Lezcano
Browse files

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



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: default avatarPeng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20220105124304.3567629-1-peng.fan@oss.nxp.com


Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent e547ffe9

drivers/clocksource/timer-imx-tpm.c

+1 −1
Original line number Diff line number Diff line
@@ -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",