[PATCH v3 0/2] pwm: loongson: Fix PWM configuration handling

[Keguang Zhang via B4 Relay]

This series fixes two issues in the Loongson PWM driver:

- Fix the handling of the Low Pulse Buffer Register, which was
  incorrectly treated as a duty-cycle register.

- Reset the PWM counter when disabling the PWM and release it when
  enabling the PWM so that updated LOW and PERIOD values are latched
  before the PWM starts running again.

The fixes were verified on LS1B, LS1C, and LS2K0300 boards.

Signed-off-by: Keguang Zhang <keguang.zhang@xxxxxxxxx>
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Changes in v3:
- Calculate the low pulse as period - duty after rounding the duty cycle.
- Handle LOW > PERIOD in pwm_loongson_get_state().
- Add a Fixes tag to the second patch.
- Link to v2: https://lore.kernel.org/r/20260626-pwm-loongson-fix-v2-0-5492db953879@xxxxxxxxx

Changes in v2:
- Drop the -ERANGE return change and restore the original behavior.
- Use mul_u64_u64_div_u64_roundup() to calculate the low pulse width.
- Update the commit message accordingly.
- Link to v1: https://lore.kernel.org/r/20260616-pwm-loongson-fix-v1-0-491dbf260a7f@xxxxxxxxx

---
Keguang Zhang (2):
      pwm: loongson: Fix low pulse buffer register handling
      pwm: loongson: Reload PWM configuration through counter reset

 drivers/pwm/pwm-loongson.c | 40 ++++++++++++++++++++++++++--------------
 1 file changed, 26 insertions(+), 14 deletions(-)
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base-commit: cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5
change-id: 20260612-pwm-loongson-fix-183763451e93

Best regards,
-- 
Keguang Zhang <keguang.zhang@xxxxxxxxx>