github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-27 09:36:22 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

pwm: stm32: Make use of mul_u64_u64_div_u64_roundup()

Browse Source 
When the driver was converted to the waveform API the need for this
function arised but at that time this function didn't exist yet. In the
meantime it's available, so switch to the global function and drop the
driver specific implementation.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/788319f0fff963feca4df3c5fcdd471dcf70ccdf.1776264104.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
This commit is contained in:
Uwe Kleine-König 2026-04-15 16:50:13 +02:00 committed by Uwe Kleine-König
parent 5ac9b13e3f
commit 35ce15049e
1 changed files with 5 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/pwm/pwm-stm32.c
View File

@ -193,22 +193,6 @@ static int stm32_pwm_round_waveform_tohw(struct pwm_chip *chip,
return ret;
}
/*
* This should be moved to lib/math/div64.c. Currently there are some changes
* pending to mul_u64_u64_div_u64. Uwe will care for that when the dust settles.
*/
static u64 stm32_pwm_mul_u64_u64_div_u64_roundup(u64 a, u64 b, u64 c)
{
u64 res = mul_u64_u64_div_u64(a, b, c);
/* Those multiplications might overflow but it doesn't matter */
u64 rem = a * b - c * res;
if (rem)
res += 1;
return res;
}
static int stm32_pwm_round_waveform_fromhw(struct pwm_chip *chip,
struct pwm_device *pwm,
const void *_wfhw,
@ -223,16 +207,15 @@ static int stm32_pwm_round_waveform_fromhw(struct pwm_chip *chip,
u64 ccr_ns;
/* The result doesn't overflow for rate >= 15259 */
wf->period_length_ns = stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1),
NSEC_PER_SEC, rate);
wf->period_length_ns = mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1),
NSEC_PER_SEC, rate);
ccr_ns = stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * wfhw->ccr,
NSEC_PER_SEC, rate);
ccr_ns = mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * wfhw->ccr, NSEC_PER_SEC, rate);
if (wfhw->ccer & TIM_CCER_CCxP(ch + 1)) {
wf->duty_length_ns =
stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1 - wfhw->ccr),
NSEC_PER_SEC, rate);
mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1 - wfhw->ccr),
NSEC_PER_SEC, rate);
wf->duty_offset_ns = ccr_ns;
} else {