diff options
| author | Ingo Molnar <mingo@kernel.org> | 2025-04-22 08:31:41 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-04-22 08:31:41 +0200 |
| commit | c96f564e6f943cf5d8536e1c43f243aa7c42b4ed (patch) | |
| tree | ada98ccab9b31fe9519b4e6ea2beec63ad98cb16 /drivers/pwm/pwm-rcar.c | |
| parent | 321550859f3bd64f547d0b4e9fbd97bd539ef47c (diff) | |
| parent | 06e09002bc1d46505d6b3bd947ebaf3cec7acab8 (diff) | |
Merge branch 'x86/cpu' into x86/microcode, to pick up dependent commits
Avoid a conflict in <asm/cpufeatures.h> by merging pending x86/cpu changes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/pwm/pwm-rcar.c')
| -rw-r--r-- | drivers/pwm/pwm-rcar.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/drivers/pwm/pwm-rcar.c b/drivers/pwm/pwm-rcar.c index 2261789cc27d..578dbdd2d5a7 100644 --- a/drivers/pwm/pwm-rcar.c +++ b/drivers/pwm/pwm-rcar.c @@ -8,6 +8,7 @@ * - The hardware cannot generate a 0% duty cycle. */ +#include <linux/bitfield.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/io.h> @@ -102,23 +103,24 @@ static void rcar_pwm_set_clock_control(struct rcar_pwm_chip *rp, rcar_pwm_write(rp, value, RCAR_PWMCR); } -static int rcar_pwm_set_counter(struct rcar_pwm_chip *rp, int div, int duty_ns, - int period_ns) +static int rcar_pwm_set_counter(struct rcar_pwm_chip *rp, int div, u64 duty_ns, + u64 period_ns) { - unsigned long long one_cycle, tmp; /* 0.01 nanoseconds */ + unsigned long long tmp; unsigned long clk_rate = clk_get_rate(rp->clk); u32 cyc, ph; - one_cycle = NSEC_PER_SEC * 100ULL << div; - do_div(one_cycle, clk_rate); + /* div <= 24 == RCAR_PWM_MAX_DIVISION, so the shift doesn't overflow. */ + tmp = mul_u64_u64_div_u64(period_ns, clk_rate, (u64)NSEC_PER_SEC << div); + if (tmp > FIELD_MAX(RCAR_PWMCNT_CYC0_MASK)) + tmp = FIELD_MAX(RCAR_PWMCNT_CYC0_MASK); - tmp = period_ns * 100ULL; - do_div(tmp, one_cycle); - cyc = (tmp << RCAR_PWMCNT_CYC0_SHIFT) & RCAR_PWMCNT_CYC0_MASK; + cyc = FIELD_PREP(RCAR_PWMCNT_CYC0_MASK, tmp); - tmp = duty_ns * 100ULL; - do_div(tmp, one_cycle); - ph = tmp & RCAR_PWMCNT_PH0_MASK; + tmp = mul_u64_u64_div_u64(duty_ns, clk_rate, (u64)NSEC_PER_SEC << div); + if (tmp > FIELD_MAX(RCAR_PWMCNT_PH0_MASK)) + tmp = FIELD_MAX(RCAR_PWMCNT_PH0_MASK); + ph = FIELD_PREP(RCAR_PWMCNT_PH0_MASK, tmp); /* Avoid prohibited setting */ if (cyc == 0 || ph == 0) |