pwm-bcm2835: add atomic update support - Githubissues

lategoodbye / rpi-zero

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pwm-bcm2835: add atomic update support #16

Closed lategoodbye closed 3 years ago

lategoodbye commented 7 years ago

Currently the pwm-bcm2835 provides the non-atomic ops, so change the driver accordingly:

https://github.com/torvalds/linux/commit/2bf1c98aa5a41651f5e6455117ff06f66ff3cc50 https://github.com/torvalds/linux/commit/daa5abc41c80e32ebaf069bd482b7561e0ada71d

Btw we should check for:

correct 0% and 100% duty cycle support (okay)
possible rounding issues
possible overflow on low PWM rates

lategoodbye commented 3 years ago

Lino is working on this: https://patchwork.ozlabs.org/project/linux-pwm/patch/1606564926-19555-1-git-send-email-LinoSanfilippo@gmx.de/

lategoodbye commented 3 years ago

v4 has been applied