* [PATCH] pwm: atmel-hlcdc: Implement the suspend/resume hooks
@ 2017-03-01 14:52 ` Boris Brezillon
0 siblings, 0 replies; 4+ messages in thread
From: Boris Brezillon @ 2017-03-01 14:52 UTC (permalink / raw)
To: Thierry Reding, linux-pwm
Cc: Alexandre Belloni, Nicolas Ferre, linux-arm-kernel, Boris Brezillon
Implement the suspend/resume hooks to make sure the PWM device is
restored to a correct state after a suspend.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
This patch depends on the atomic conversion patch [1].
[1]https://patchwork.ozlabs.org/patch/734251/
drivers/pwm/pwm-atmel-hlcdc.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index a3c65a165a52..e432f4d3d8d4 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -191,6 +191,38 @@ static const struct atmel_hlcdc_pwm_errata atmel_hlcdc_pwm_sama5d3_errata = {
.div1_clk_erratum = true,
};
+static int atmel_hlcdc_pwm_suspend(struct device *dev)
+{
+ struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
+
+ /* Keep the periph clock enabled if the PWM is still running. */
+ if (pwm_is_enabled(&chip->chip.pwms[0]))
+ clk_disable_unprepare(chip->hlcdc->periph_clk);
+
+ return 0;
+}
+
+static int atmel_hlcdc_pwm_resume(struct device *dev)
+{
+ struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
+ struct pwm_state state;
+ int ret;
+
+ pwm_get_state(&chip->chip.pwms[0], &state);
+
+ /* Re-enable the periph clock it was stopped during suspend. */
+ if (!state.enabled) {
+ ret = clk_prepare_enable(chip->hlcdc->periph_clk);
+ if (ret)
+ return ret;
+ }
+
+ return atmel_hlcdc_pwm_apply(&chip->chip, &chip->chip.pwms[0], &state);
+}
+
+static SIMPLE_DEV_PM_OPS(atmel_hlcdc_pwm_pm_ops,
+ atmel_hlcdc_pwm_suspend, atmel_hlcdc_pwm_resume);
+
static const struct of_device_id atmel_hlcdc_dt_ids[] = {
{
.compatible = "atmel,at91sam9n12-hlcdc",
@@ -281,6 +313,7 @@ static struct platform_driver atmel_hlcdc_pwm_driver = {
.driver = {
.name = "atmel-hlcdc-pwm",
.of_match_table = atmel_hlcdc_pwm_dt_ids,
+ .pm = &atmel_hlcdc_pwm_pm_ops,
},
.probe = atmel_hlcdc_pwm_probe,
.remove = atmel_hlcdc_pwm_remove,
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] pwm: atmel-hlcdc: Implement the suspend/resume hooks
@ 2017-03-01 14:52 ` Boris Brezillon
0 siblings, 0 replies; 4+ messages in thread
From: Boris Brezillon @ 2017-03-01 14:52 UTC (permalink / raw)
To: linux-arm-kernel
Implement the suspend/resume hooks to make sure the PWM device is
restored to a correct state after a suspend.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
This patch depends on the atomic conversion patch [1].
[1]https://patchwork.ozlabs.org/patch/734251/
drivers/pwm/pwm-atmel-hlcdc.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index a3c65a165a52..e432f4d3d8d4 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -191,6 +191,38 @@ static const struct atmel_hlcdc_pwm_errata atmel_hlcdc_pwm_sama5d3_errata = {
.div1_clk_erratum = true,
};
+static int atmel_hlcdc_pwm_suspend(struct device *dev)
+{
+ struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
+
+ /* Keep the periph clock enabled if the PWM is still running. */
+ if (pwm_is_enabled(&chip->chip.pwms[0]))
+ clk_disable_unprepare(chip->hlcdc->periph_clk);
+
+ return 0;
+}
+
+static int atmel_hlcdc_pwm_resume(struct device *dev)
+{
+ struct atmel_hlcdc_pwm *chip = dev_get_drvdata(dev);
+ struct pwm_state state;
+ int ret;
+
+ pwm_get_state(&chip->chip.pwms[0], &state);
+
+ /* Re-enable the periph clock it was stopped during suspend. */
+ if (!state.enabled) {
+ ret = clk_prepare_enable(chip->hlcdc->periph_clk);
+ if (ret)
+ return ret;
+ }
+
+ return atmel_hlcdc_pwm_apply(&chip->chip, &chip->chip.pwms[0], &state);
+}
+
+static SIMPLE_DEV_PM_OPS(atmel_hlcdc_pwm_pm_ops,
+ atmel_hlcdc_pwm_suspend, atmel_hlcdc_pwm_resume);
+
static const struct of_device_id atmel_hlcdc_dt_ids[] = {
{
.compatible = "atmel,at91sam9n12-hlcdc",
@@ -281,6 +313,7 @@ static struct platform_driver atmel_hlcdc_pwm_driver = {
.driver = {
.name = "atmel-hlcdc-pwm",
.of_match_table = atmel_hlcdc_pwm_dt_ids,
+ .pm = &atmel_hlcdc_pwm_pm_ops,
},
.probe = atmel_hlcdc_pwm_probe,
.remove = atmel_hlcdc_pwm_remove,
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] pwm: atmel-hlcdc: Implement the suspend/resume hooks
2017-03-01 14:52 ` Boris Brezillon
@ 2017-04-06 14:16 ` Thierry Reding
-1 siblings, 0 replies; 4+ messages in thread
From: Thierry Reding @ 2017-04-06 14:16 UTC (permalink / raw)
To: Boris Brezillon
Cc: linux-pwm, Nicolas Ferre, Alexandre Belloni, linux-arm-kernel
[-- Attachment #1: Type: text/plain, Size: 521 bytes --]
On Wed, Mar 01, 2017 at 03:52:27PM +0100, Boris Brezillon wrote:
> Implement the suspend/resume hooks to make sure the PWM device is
> restored to a correct state after a suspend.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> This patch depends on the atomic conversion patch [1].
>
> [1]https://patchwork.ozlabs.org/patch/734251/
>
> drivers/pwm/pwm-atmel-hlcdc.c | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
Applied, thanks.
Thierry
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] pwm: atmel-hlcdc: Implement the suspend/resume hooks
@ 2017-04-06 14:16 ` Thierry Reding
0 siblings, 0 replies; 4+ messages in thread
From: Thierry Reding @ 2017-04-06 14:16 UTC (permalink / raw)
To: linux-arm-kernel
On Wed, Mar 01, 2017 at 03:52:27PM +0100, Boris Brezillon wrote:
> Implement the suspend/resume hooks to make sure the PWM device is
> restored to a correct state after a suspend.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> This patch depends on the atomic conversion patch [1].
>
> [1]https://patchwork.ozlabs.org/patch/734251/
>
> drivers/pwm/pwm-atmel-hlcdc.c | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
Applied, thanks.
Thierry
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2017-03-01 14:52 [PATCH] pwm: atmel-hlcdc: Implement the suspend/resume hooks Boris Brezillon
2017-03-01 14:52 ` Boris Brezillon
2017-04-06 14:16 ` Thierry Reding
2017-04-06 14:16 ` Thierry Reding
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