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clocksource: extend the max_delta_ns of timer-riscv and timer-clint to ULONG_MAX

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When registering the riscv-timer or clint-timer as a clock_event device,
the driver needs to specify the value of max_delta_ticks. This value
directly influences the max_delta_ns, which represents the maximum time
interval for configuring subsequent clock events. Currently, both
riscv-timer and clint-timer are set with a max_delta_ticks value of
0x7fff_ffff. When the timer operates at a high frequency, this values
limists the system to sleep only for a short time. For the 1GHz case,
the sleep cannot exceed two seconds. To address this limitation, refer to
other timer implementations to extend it to 2^(bit-width of the timer) - 1.
Because the bit-width of $mtimecmp is 64bit, this value becomes ULONG_MAX
(0xffff_ffff_ffff_ffff).

Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Link: https://lore.kernel.org/r/20230905070945.404653-1-vincent.chen@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Vincent Chen 2023-09-05 15:09:45 +08:00 committed by Palmer Dabbelt
parent 67daf84203
commit d38e2e7bcb
No known key found for this signature in database
GPG key ID: 2E1319F35FBB1889
2 changed files with 2 additions and 2 deletions
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2
drivers/clocksource/timer-clint.c
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@ -131,7 +131,7 @@ static int clint_timer_starting_cpu(unsigned int cpu)
struct clock_event_device *ce = per_cpu_ptr(&clint_clock_event, cpu);
ce->cpumask = cpumask_of(cpu);
clockevents_config_and_register(ce, clint_timer_freq, 100, 0x7fffffff);
clockevents_config_and_register(ce, clint_timer_freq, 100, ULONG_MAX);
enable_percpu_irq(clint_timer_irq,
irq_get_trigger_type(clint_timer_irq));

2
drivers/clocksource/timer-riscv.c
View file

@ -114,7 +114,7 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
ce->features |= CLOCK_EVT_FEAT_C3STOP;
if (static_branch_likely(&riscv_sstc_available))
ce->rating = 450;
clockevents_config_and_register(ce, riscv_timebase, 100, 0x7fffffff);
clockevents_config_and_register(ce, riscv_timebase, 100, ULONG_MAX);
enable_percpu_irq(riscv_clock_event_irq,
irq_get_trigger_type(riscv_clock_event_irq));