[v6,0/4] Improve pwm-ir-tx precision

Message

Sean Young Nov. 29, 2023, 9:13 a.m. UTC

The pwm-ir-tx driver has to turn the pwm signal on and off, and suffers
from delays as this is done in process context. Make this work in atomic
context.

changes:

v6:
 - Rename pwm_apply_cansleep() to pwm_apply_might_sleep()
 - rebase

v5:
 - Use dev_err_probe() as Uwe suggested
 - rebase

v4:
 - Split out the pwm_apply_state() rename into seperate commit
 - Atomic pwm function is called pwm_apply_atomic() and sleeping
   counterpart pwm_apply_cansleep()
 - Fix commit messages

v3:
 - Renamed pwm_apply_state() to pwm_apply_cansleep()
 - Moved pwm atomic to struct pwm_chip
 - Fixed pwm docs
 - Other minor code review comments

v2:
 - Simplified the pwm ir tx based on Ivaylo Dimitrov suggestions
 - Renamed pwm_can_sleep() to pwm_is_atomic
 - Fix sleeping issue in pwm-bcm2835 (clk_get_rate() can sleep)
 - use non_block_start() in pwm to check atomic-ness


Sean Young (4):
  pwm: rename pwm_apply_state() to pwm_apply_might_sleep()
  pwm: make it possible to apply pwm changes in atomic context
  pwm: bcm2835: allow pwm driver to be used in atomic context
  media: pwm-ir-tx: trigger edges from hrtimer interrupt context

 Documentation/driver-api/pwm.rst              | 17 +++-
 .../gpu/drm/i915/display/intel_backlight.c    |  6 +-
 drivers/gpu/drm/solomon/ssd130x.c             |  2 +-
 drivers/hwmon/pwm-fan.c                       |  8 +-
 drivers/input/misc/da7280.c                   |  4 +-
 drivers/input/misc/pwm-beeper.c               |  4 +-
 drivers/input/misc/pwm-vibra.c                |  8 +-
 drivers/leds/leds-pwm.c                       |  2 +-
 drivers/leds/rgb/leds-pwm-multicolor.c        |  4 +-
 drivers/media/rc/pwm-ir-tx.c                  | 83 +++++++++++++++++--
 drivers/platform/x86/lenovo-yogabook.c        |  2 +-
 drivers/pwm/core.c                            | 75 +++++++++++++----
 drivers/pwm/pwm-bcm2835.c                     | 31 ++++---
 drivers/pwm/pwm-renesas-tpu.c                 |  1 -
 drivers/pwm/pwm-twl-led.c                     |  2 +-
 drivers/pwm/pwm-vt8500.c                      |  2 +-
 drivers/pwm/sysfs.c                           | 10 +--
 drivers/regulator/pwm-regulator.c             |  4 +-
 drivers/video/backlight/lm3630a_bl.c          |  2 +-
 drivers/video/backlight/lp855x_bl.c           |  2 +-
 drivers/video/backlight/pwm_bl.c              | 12 +--
 drivers/video/fbdev/ssd1307fb.c               |  2 +-
 include/linux/pwm.h                           | 57 +++++++++----
 23 files changed, 248 insertions(+), 92 deletions(-)