Messages in this thread | | | From | Florian Vaussard <> | Subject | [PATCH v2 0/3] leds-pwm: Defer PWM calls if PWM can sleep | Date | Fri, 25 Jan 2013 14:44:28 +0100 |
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Hello,
When using the leds-pwm module with external PWM chips connected through I2C, the kernel will panic when settings a trigger. In this case, PWM calls can sleep, and should be deferred.
Patch 1 and 2 add the necessary API to the PWM subsystem, and update matching drivers. Patch 3 updates leds-pwm to use a worker if the PWM chip can sleep, or performs direct calls otherwise.
This patchset is based on the for-next branch of the led subsystem [1], as patch 3 depends on the recent work of Peter for DT bindings in leds-pwm. The pwm patches should probably follow the same path.
Tested on Overo (OMAP3 + TWL4030) with device tree.
Best regards,
Florian
[1] git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds.git
Changes from v1: * pwm_can_sleep -> pwm_cansleep * avoid duplicated code between the worker and the direct call * cache the value of pwm_cansleep inside leds-pwm to avoid API calls
Florian Vaussard (3): pwm: Add pwm_cansleep() as exported API to users pwm: Add can_sleep property to drivers leds: leds-pwm: Defer led_pwm_set() if PWM can sleep
drivers/leds/leds-pwm.c | 50 +++++++++++++++++++++++++++++++++++++------- drivers/pwm/core.c | 12 ++++++++++ drivers/pwm/pwm-twl-led.c | 1 + drivers/pwm/pwm-twl.c | 1 + include/linux/pwm.h | 10 +++++++++ 5 files changed, 66 insertions(+), 8 deletions(-)
-- 1.7.5.4
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