| Message ID | 1558917399-7065-1-git-send-email-cv-dong@jinso.co.jp (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | [v4] pwm: renesas-tpu: Add suspend/resume function | expand |
Hi > This patch adds suspend/resume function support for Renesas the 16-Bit Timer > Pulse Unit (TPU) driver. This has been tested on the Salvator-XS board > with R-Car M3-N and H3 at renesas-drivers-2019-05-21-v5.2-rc1 tag. > I expect this to work on other SoCs. (snip) > +#ifdef CONFIG_PM_SLEEP > +static int tpu_pwm_suspend(struct device *dev) > +{ > + struct tpu_device *tpu = dev_get_drvdata(dev); > + struct pwm_chip *chip = &tpu->chip; > + struct pwm_device *pwm; > + int i; > + > + for (i = 0; i < TPU_CHANNEL_MAX; i++) { > + pwm = &chip->pwms[i]; > + if (pwm_is_enabled(pwm)) { > + if (!test_bit(PWMF_REQUESTED, &pwm->flags)) > + return 0; > + tpu_pwm_disable(pwm->chip,pwm); > + } > + } I'm not familiar with pwm driver, but pwm_is_enabled() and if (!test_bit(PWMF_REQUESTED, &pwm->flags)) can be happen in the same time ? In other words, can we enable pwm without PWMF_REQUESTED ? > +static int tpu_pwm_resume(struct device *dev) > +{ > + struct tpu_device *tpu = dev_get_drvdata(dev); > + struct pwm_chip *chip = &tpu->chip; > + struct pwm_device *pwm; > + int i; > + > + for (i = 0; i < TPU_CHANNEL_MAX; i++) { > + pwm = &chip->pwms[i]; > + if (pwm_is_enabled(pwm)) { > + if (!test_bit(PWMF_REQUESTED, &pwm->flags)) > + return 0; > + tpu_pwm_enable(pwm->chip,pwm); > + } > + } Please use ${LINUX}/scripts/checkpatch.pl Thank you for your help !! Best regards --- Kuninori Morimoto
Dear Morimoto-san, Thank for your feedback! On 2019/05/27 10:24, Kuninori Morimoto wrote: > Hi > >> This patch adds suspend/resume function support for Renesas the 16-Bit Timer >> Pulse Unit (TPU) driver. This has been tested on the Salvator-XS board >> with R-Car M3-N and H3 at renesas-drivers-2019-05-21-v5.2-rc1 tag. >> I expect this to work on other SoCs. > (snip) >> +#ifdef CONFIG_PM_SLEEP >> +static int tpu_pwm_suspend(struct device *dev) >> +{ >> + struct tpu_device *tpu = dev_get_drvdata(dev); >> + struct pwm_chip *chip = &tpu->chip; >> + struct pwm_device *pwm; >> + int i; >> + >> + for (i = 0; i < TPU_CHANNEL_MAX; i++) { >> + pwm = &chip->pwms[i]; >> + if (pwm_is_enabled(pwm)) { >> + if (!test_bit(PWMF_REQUESTED, &pwm->flags)) >> + return 0; >> + tpu_pwm_disable(pwm->chip,pwm); >> + } >> + } > I'm not familiar with pwm driver, but pwm_is_enabled() and > if (!test_bit(PWMF_REQUESTED, &pwm->flags)) can be happen in the same time ? > In other words, can we enable pwm without PWMF_REQUESTED ? Thank for your help! Can. Perhaps the PWMF_REQUESTED check is not necessary. I will remove it. >> +static int tpu_pwm_resume(struct device *dev) >> +{ >> + struct tpu_device *tpu = dev_get_drvdata(dev); >> + struct pwm_chip *chip = &tpu->chip; >> + struct pwm_device *pwm; >> + int i; >> + >> + for (i = 0; i < TPU_CHANNEL_MAX; i++) { >> + pwm = &chip->pwms[i]; >> + if (pwm_is_enabled(pwm)) { >> + if (!test_bit(PWMF_REQUESTED, &pwm->flags)) >> + return 0; >> + tpu_pwm_enable(pwm->chip,pwm); >> + } >> + } > Please use ${LINUX}/scripts/checkpatch.pl Thanks for the prompt! Thank you, Dong > Thank you for your help !! > Best regards > --- > Kuninori Morimoto
diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c index 4a855a2..3c2819b 100644 --- a/drivers/pwm/pwm-renesas-tpu.c +++ b/drivers/pwm/pwm-renesas-tpu.c @@ -366,6 +366,47 @@ static void tpu_pwm_disable(struct pwm_chip *chip, struct pwm_device *_pwm) tpu_pwm_timer_stop(pwm); } +#ifdef CONFIG_PM_SLEEP +static int tpu_pwm_suspend(struct device *dev) +{ + struct tpu_device *tpu = dev_get_drvdata(dev); + struct pwm_chip *chip = &tpu->chip; + struct pwm_device *pwm; + int i; + + for (i = 0; i < TPU_CHANNEL_MAX; i++) { + pwm = &chip->pwms[i]; + if (pwm_is_enabled(pwm)) { + if (!test_bit(PWMF_REQUESTED, &pwm->flags)) + return 0; + tpu_pwm_disable(pwm->chip,pwm); + } + } + + return 0; +} + +static int tpu_pwm_resume(struct device *dev) +{ + struct tpu_device *tpu = dev_get_drvdata(dev); + struct pwm_chip *chip = &tpu->chip; + struct pwm_device *pwm; + int i; + + for (i = 0; i < TPU_CHANNEL_MAX; i++) { + pwm = &chip->pwms[i]; + if (pwm_is_enabled(pwm)) { + if (!test_bit(PWMF_REQUESTED, &pwm->flags)) + return 0; + tpu_pwm_enable(pwm->chip,pwm); + } + } + + return 0; +} +#endif /* CONFIG_PM_SLEEP */ +static SIMPLE_DEV_PM_OPS(tpu_pwm_pm_ops, tpu_pwm_suspend, tpu_pwm_resume); + static const struct pwm_ops tpu_pwm_ops = { .request = tpu_pwm_request, .free = tpu_pwm_free, @@ -459,6 +500,7 @@ static struct platform_driver tpu_driver = { .remove = tpu_remove, .driver = { .name = "renesas-tpu-pwm", + .pm = &tpu_pwm_pm_ops, .of_match_table = of_match_ptr(tpu_of_table), } };
This patch adds suspend/resume function support for Renesas the 16-Bit Timer Pulse Unit (TPU) driver. This has been tested on the Salvator-XS board with R-Car M3-N and H3 at renesas-drivers-2019-05-21-v5.2-rc1 tag. I expect this to work on other SoCs. Test procedure: - Enable TPU and pin control in DTS. - Make sure switches { SW29-[1-2] are switched off or SW31-[1-4] are switched off(only for Salvator-xs) }. - Exercise userspace PWM control for pwm[2,3] of /sys/class/pwm/pwmchip1/ . - Inspect PWM signals on the input side of { CN29-[58,60] or SW31-[1,2] (only for Salvator-xs) } before and after suspend/resume using an oscilloscope. Signed-off-by: Cao Van Dong <cv-dong@jinso.co.jp> Tested-by: Cao Van Dong <cv-dong@jinso.co.jp> --- Changes v3 -> v4: - Use pwm_is_enabled(pwm) to check channel instead of pwm_get_chip_data(&chip->pwms[i]). - Move tpu_pwm_disable() to tpu_pwm_suspend(), tpu_pwm_enable() to tpu_pwm_resume(). - Remove tpu_pwm_restart_timer() function and remove pm_runtime_get_sync() in tpu_pwm_resume(). --- Changes v2 -> v3: - Changes '3' -> TPU_CHANNEL_MAX in loop. - Remove pm_runtime_put() function in tpu_pwm_suspend() function. --- Changes v1 -> v2: - Repair the handling code to cover case of using multiple timers. --- drivers/pwm/pwm-renesas-tpu.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)