From: Peng Fan Date: Wed, 5 Jan 2022 12:43:04 +0000 (+0800) Subject: clocksource/drivers/imx-tpm: Exclude sched clock for ARM64 X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=10720e120e2b1d66172dccb06eb4f346a665cca6;p=linux.git 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: Peng Fan Link: https://lore.kernel.org/r/20220105124304.3567629-1-peng.fan@oss.nxp.com Signed-off-by: Daniel Lezcano --- diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c index df8064122b10c..60cefc247b715 100644 --- a/drivers/clocksource/timer-imx-tpm.c +++ b/drivers/clocksource/timer-imx-tpm.c @@ -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",