diff mbox series

[v10,3/3] pwm: sifive: Fix the error in the idempotent test within the pwm_apply_state_debug function

Message ID 20241224093902.1632627-4-nylon.chen@sifive.com (mailing list archive)
State New
Headers show
Series Change PWM-controlled LED pin active mode and algorithm | expand

Checks

Context Check Description
conchuod/vmtest-for-next-PR success PR summary
conchuod/patch-3-test-1 success .github/scripts/patches/tests/build_rv32_defconfig.sh took 101.38s
conchuod/patch-3-test-2 success .github/scripts/patches/tests/build_rv64_clang_allmodconfig.sh took 998.30s
conchuod/patch-3-test-3 success .github/scripts/patches/tests/build_rv64_gcc_allmodconfig.sh took 1178.45s
conchuod/patch-3-test-4 success .github/scripts/patches/tests/build_rv64_nommu_k210_defconfig.sh took 16.04s
conchuod/patch-3-test-5 success .github/scripts/patches/tests/build_rv64_nommu_virt_defconfig.sh took 17.42s
conchuod/patch-3-test-6 success .github/scripts/patches/tests/checkpatch.sh took 0.34s
conchuod/patch-3-test-7 success .github/scripts/patches/tests/dtb_warn_rv64.sh took 36.71s
conchuod/patch-3-test-8 success .github/scripts/patches/tests/header_inline.sh took 0.00s
conchuod/patch-3-test-9 success .github/scripts/patches/tests/kdoc.sh took 0.47s
conchuod/patch-3-test-10 success .github/scripts/patches/tests/module_param.sh took 0.01s
conchuod/patch-3-test-11 success .github/scripts/patches/tests/verify_fixes.sh took 0.00s
conchuod/patch-3-test-12 success .github/scripts/patches/tests/verify_signedoff.sh took 0.02s

Commit Message

Nylon Chen Dec. 24, 2024, 9:39 a.m. UTC 
Round the result to the nearest whole number. This ensures that real_period
is always a reasonable integer that is not lower than the actual value.

e.g.
$ echo 110 > /sys/devices/platform/led-controller-1/leds/d12/brightness
$ .apply is not idempotent (ena=1 pol=0 1739692/4032985) -> (ena=1 pol=0
1739630/4032985)

Co-developed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Nylon Chen <nylon.chen@sifive.com>
---
 drivers/pwm/pwm-sifive.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
index bb9146267bc5..6259f8500f71 100644
--- a/drivers/pwm/pwm-sifive.c
+++ b/drivers/pwm/pwm-sifive.c
@@ -101,7 +101,7 @@  static void pwm_sifive_update_clock(struct pwm_sifive_ddata *ddata,
 
 	/* As scale <= 15 the shift operation cannot overflow. */
 	num = (unsigned long long)NSEC_PER_SEC << (PWM_SIFIVE_CMPWIDTH + scale);
-	ddata->real_period = div64_ul(num, rate);
+	ddata->real_period = DIV_ROUND_UP_ULL(num, rate);
 	dev_dbg(ddata->parent,
 		"New real_period = %u ns\n", ddata->real_period);
 }