Messages in this thread Patch in this message | | | From | "Peng Fan (OSS)" <> | Subject | [PATCH] clocksource/drivers/imx-tpm: exclude sched clock for ARM64 | Date | Wed, 5 Jan 2022 20:43:04 +0800 |
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From: Peng Fan <peng.fan@nxp.com>
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> --- drivers/clocksource/timer-imx-tpm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c index 2cdc077a39f5..2bd530b9adc4 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", -- 2.25.1
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