* [PATCH] pwm: renesas-tpu: Add suspend/resume function
@ 2019-05-22 8:06 Cao Van Dong
2019-05-23 0:29 ` Cao Van Dong
0 siblings, 1 reply; 2+ messages in thread
From: Cao Van Dong @ 2019-05-22 8:06 UTC (permalink / raw)
To: linux-renesas-soc, thierry.reding, horms+renesas, geert+renesas,
broonie, linux-pwm
Cc: yoshihiro.shimoda.uh, kuninori.morimoto.gx, h-inayoshi, na-hoan, cv-dong
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>
---
drivers/pwm/pwm-renesas-tpu.c | 49 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c
index 4a855a2..97b026e 100644
--- a/drivers/pwm/pwm-renesas-tpu.c
+++ b/drivers/pwm/pwm-renesas-tpu.c
@@ -366,6 +366,54 @@ static void tpu_pwm_disable(struct pwm_chip *chip, struct pwm_device *_pwm)
tpu_pwm_timer_stop(pwm);
}
+#ifdef CONFIG_PM_SLEEP
+static struct pwm_device *tpu_pwm_dev_to_pwm_dev(struct device *dev)
+{
+ struct tpu_device *tpu = dev_get_drvdata(dev);
+ struct pwm_chip *chip = &tpu->chip;
+
+ if((pwm_get_chip_data(&chip->pwms[0])) != NULL)
+ return &chip->pwms[0];
+ if((pwm_get_chip_data(&chip->pwms[1])) != NULL)
+ return &chip->pwms[1];
+ if((pwm_get_chip_data(&chip->pwms[2])) != NULL)
+ return &chip->pwms[2];
+ if((pwm_get_chip_data(&chip->pwms[3])) != NULL)
+ return &chip->pwms[3];
+
+ return NULL;
+}
+
+static int tpu_pwm_suspend(struct device *dev)
+{
+ struct pwm_device *pwm = tpu_pwm_dev_to_pwm_dev(dev);
+
+ if (!test_bit(PWMF_REQUESTED, &pwm->flags))
+ return 0;
+
+ pm_runtime_put(dev);
+
+ return 0;
+}
+
+static int tpu_pwm_resume(struct device *dev)
+{
+ struct pwm_device *pwm = tpu_pwm_dev_to_pwm_dev(dev);
+
+ if ((!test_bit(PWMF_REQUESTED, &pwm->flags)) || pwm == NULL)
+ return 0;
+
+ pm_runtime_get_sync(dev);
+
+ /* Restart timer */
+ tpu_pwm_disable(pwm->chip,pwm);
+ 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 +507,7 @@ 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),
}
};
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] pwm: renesas-tpu: Add suspend/resume function
2019-05-22 8:06 [PATCH] pwm: renesas-tpu: Add suspend/resume function Cao Van Dong
@ 2019-05-23 0:29 ` Cao Van Dong
0 siblings, 0 replies; 2+ messages in thread
From: Cao Van Dong @ 2019-05-23 0:29 UTC (permalink / raw)
To: linux-renesas-soc, thierry.reding, horms+renesas, geert+renesas,
broonie, linux-pwm
Cc: yoshihiro.shimoda.uh, kuninori.morimoto.gx, h-inayoshi, na-hoan, cv-dong
On 2019/05/22 17:06, Cao Van Dong wrote:
> 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>
> ---
> drivers/pwm/pwm-renesas-tpu.c | 49 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 49 insertions(+)
>
> diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c
> index 4a855a2..97b026e 100644
> --- a/drivers/pwm/pwm-renesas-tpu.c
> +++ b/drivers/pwm/pwm-renesas-tpu.c
> @@ -366,6 +366,54 @@ static void tpu_pwm_disable(struct pwm_chip *chip, struct pwm_device *_pwm)
> tpu_pwm_timer_stop(pwm);
> }
>
> +#ifdef CONFIG_PM_SLEEP
> +static struct pwm_device *tpu_pwm_dev_to_pwm_dev(struct device *dev)
> +{
> + struct tpu_device *tpu = dev_get_drvdata(dev);
> + struct pwm_chip *chip = &tpu->chip;
> +
> + if((pwm_get_chip_data(&chip->pwms[0])) != NULL)
> + return &chip->pwms[0];
> + if((pwm_get_chip_data(&chip->pwms[1])) != NULL)
> + return &chip->pwms[1];
> + if((pwm_get_chip_data(&chip->pwms[2])) != NULL)
> + return &chip->pwms[2];
> + if((pwm_get_chip_data(&chip->pwms[3])) != NULL)
> + return &chip->pwms[3];
Sorry everyone,
The current handling code only cover the case of using a timer.
In case of using multiple timers at a time, it will not be able
to restart all of them. Therefore, I will repair it to cover all
and resubmit in version v2.
Thank you,
Dong
> + return NULL;
> +}
> +
> +static int tpu_pwm_suspend(struct device *dev)
> +{
> + struct pwm_device *pwm = tpu_pwm_dev_to_pwm_dev(dev);
> +
> + if (!test_bit(PWMF_REQUESTED, &pwm->flags))
> + return 0;
> +
> + pm_runtime_put(dev);
> +
> + return 0;
> +}
> +
> +static int tpu_pwm_resume(struct device *dev)
> +{
> + struct pwm_device *pwm = tpu_pwm_dev_to_pwm_dev(dev);
> +
> + if ((!test_bit(PWMF_REQUESTED, &pwm->flags)) || pwm == NULL)
> + return 0;
> +
> + pm_runtime_get_sync(dev);
> +
> + /* Restart timer */
> + tpu_pwm_disable(pwm->chip,pwm);
> + 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 +507,7 @@ 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),
> }
> };
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2019-05-23 0:29 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-22 8:06 [PATCH] pwm: renesas-tpu: Add suspend/resume function Cao Van Dong
2019-05-23 0:29 ` Cao Van Dong
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).