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| author | Anup Patel <apatel@ventanamicro.com> | 2023-01-03 19:41:02 +0530 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2023-02-13 13:10:16 +0100 |
| commit | 8932a9533a9cdd1fa2924a061dc87277991507ca (patch) | |
| tree | 1f856cdbc6b3997fa126584b3702d4837d2002f9 /drivers/clocksource | |
| parent | e2bcf2d876fd7ca6ecca09794ac58d7e3a544794 (diff) | |
| download | lwn-8932a9533a9cdd1fa2924a061dc87277991507ca.tar.gz lwn-8932a9533a9cdd1fa2924a061dc87277991507ca.zip | |
clocksource/drivers/timer-riscv: Set CLOCK_EVT_FEAT_C3STOP based on DT
We should set CLOCK_EVT_FEAT_C3STOP for a clock_event_device only
when riscv,timer-cannot-wake-cpu DT property is present in the RISC-V
timer DT node.
This way CLOCK_EVT_FEAT_C3STOP feature is set for clock_event_device
based on RISC-V platform capabilities rather than having it set for
all RISC-V platforms.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20230103141102.772228-4-apatel@ventanamicro.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/timer-riscv.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c index a0d66fabf073..1b4b36df5484 100644 --- a/drivers/clocksource/timer-riscv.c +++ b/drivers/clocksource/timer-riscv.c @@ -28,6 +28,7 @@ #include <asm/timex.h> static DEFINE_STATIC_KEY_FALSE(riscv_sstc_available); +static bool riscv_timer_cannot_wake_cpu; static int riscv_clock_next_event(unsigned long delta, struct clock_event_device *ce) @@ -85,6 +86,8 @@ static int riscv_timer_starting_cpu(unsigned int cpu) ce->cpumask = cpumask_of(cpu); ce->irq = riscv_clock_event_irq; + if (riscv_timer_cannot_wake_cpu) + ce->features |= CLOCK_EVT_FEAT_C3STOP; clockevents_config_and_register(ce, riscv_timebase, 100, 0x7fffffff); enable_percpu_irq(riscv_clock_event_irq, @@ -139,6 +142,13 @@ static int __init riscv_timer_init_dt(struct device_node *n) if (cpuid != smp_processor_id()) return 0; + child = of_find_compatible_node(NULL, NULL, "riscv,timer"); + if (child) { + riscv_timer_cannot_wake_cpu = of_property_read_bool(child, + "riscv,timer-cannot-wake-cpu"); + of_node_put(child); + } + domain = NULL; child = of_get_compatible_child(n, "riscv,cpu-intc"); if (!child) { |