[PATCH] rtc: max77686: Fix wake-ups for max77620

[PATCH] rtc: max77686: Fix wake-ups for max77620

[Jon Hunter]

Following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
fire before system resume"), RTC wake-ups stopped working on Jetson TX2
and Jetson Xavier platforms. The Jetson TX2 uses the max77620 PMIC and
the Jetson Xavier uses max20024 PMIC. Both of these PMICs have the same
max77620 RTC controller.

For the max77620 RTC, the variable 'rtc_irq_from_platform' is defined as
true in the max77686 driver and because of this the IRQ passed to the
max77686 driver for RTC is the PMIC IRQ and not the parent. Hence,
following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
fire before system resume"), for the max77620 the RTC IRQ within the
PMIC is now getting disabled on entry to suspend and unable to wake the
system up. Fix this by only disabling interrupts on entry to suspend
in the max77686 RTC driver, if the interrupt is the parent interrupt.

Fixes: d8f090dbeafd ("rtc: max77686: Do not allow interrupt to fire before system resume")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
---
 drivers/rtc/rtc-max77686.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 645de5af707b..d51cc12114cb 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -815,13 +815,15 @@ static int max77686_rtc_suspend(struct device *dev)
 	}
 
 	/*
-	 * Main IRQ (not virtual) must be disabled during suspend because if it
-	 * happens while suspended it will be handled before resuming I2C.
+	 * If the main IRQ (not virtual) is the parent IRQ, then it must be
+	 * disabled during suspend because if it happens while suspended it
+	 * will be handled before resuming I2C.
 	 *
 	 * Since Main IRQ is shared, all its users should disable it to be sure
 	 * it won't fire while one of them is still suspended.
 	 */
-	disable_irq(info->rtc_irq);
+	if (!info->drv_data->rtc_irq_from_platform)
+		disable_irq(info->rtc_irq);
 
 	return ret;
 }
@@ -830,7 +832,8 @@ static int max77686_rtc_resume(struct device *dev)
 {
 	struct max77686_rtc_info *info = dev_get_drvdata(dev);
 
-	enable_irq(info->rtc_irq);
+	if (!info->drv_data->rtc_irq_from_platform)
+		enable_irq(info->rtc_irq);
 
 	if (device_may_wakeup(dev)) {
 		struct max77686_rtc_info *info = dev_get_drvdata(dev);
-- 
2.25.1

Re: [PATCH] rtc: max77686: Fix wake-ups for max77620

[Krzysztof Kozlowski]

On Thu, Aug 06, 2020 at 01:54:31PM +0100, Jon Hunter wrote:
> Following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
> fire before system resume"), RTC wake-ups stopped working on Jetson TX2
> and Jetson Xavier platforms. The Jetson TX2 uses the max77620 PMIC and
> the Jetson Xavier uses max20024 PMIC. Both of these PMICs have the same
> max77620 RTC controller.
> 
> For the max77620 RTC, the variable 'rtc_irq_from_platform' is defined as
> true in the max77686 driver and because of this the IRQ passed to the
> max77686 driver for RTC is the PMIC IRQ and not the parent. Hence,
> following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
> fire before system resume"), for the max77620 the RTC IRQ within the
> PMIC is now getting disabled on entry to suspend and unable to wake the
> system up. Fix this by only disabling interrupts on entry to suspend
> in the max77686 RTC driver, if the interrupt is the parent interrupt.
> 
> Fixes: d8f090dbeafd ("rtc: max77686: Do not allow interrupt to fire before system resume")
> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
> ---
>  drivers/rtc/rtc-max77686.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)

Acked-by: Krzysztof Kozlowski <krzk@kernel.org>

Best regards,
Krzysztof

Re: [PATCH] rtc: max77686: Fix wake-ups for max77620

[Thierry Reding]

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On Thu, Aug 06, 2020 at 01:54:31PM +0100, Jon Hunter wrote:
> Following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
> fire before system resume"), RTC wake-ups stopped working on Jetson TX2
> and Jetson Xavier platforms. The Jetson TX2 uses the max77620 PMIC and
> the Jetson Xavier uses max20024 PMIC. Both of these PMICs have the same
> max77620 RTC controller.
> 
> For the max77620 RTC, the variable 'rtc_irq_from_platform' is defined as
> true in the max77686 driver and because of this the IRQ passed to the
> max77686 driver for RTC is the PMIC IRQ and not the parent. Hence,
> following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
> fire before system resume"), for the max77620 the RTC IRQ within the
> PMIC is now getting disabled on entry to suspend and unable to wake the
> system up. Fix this by only disabling interrupts on entry to suspend
> in the max77686 RTC driver, if the interrupt is the parent interrupt.
> 
> Fixes: d8f090dbeafd ("rtc: max77686: Do not allow interrupt to fire before system resume")
> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
> ---
>  drivers/rtc/rtc-max77686.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)

Looks good and fixes suspend/resume with rtcwake for me on Jetson TX2
and Jetson AGX Xavier:

Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>

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Re: [PATCH] rtc: max77686: Fix wake-ups for max77620

[Alexandre Belloni]

On Thu, 6 Aug 2020 13:54:31 +0100, Jon Hunter wrote:
> Following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
> fire before system resume"), RTC wake-ups stopped working on Jetson TX2
> and Jetson Xavier platforms. The Jetson TX2 uses the max77620 PMIC and
> the Jetson Xavier uses max20024 PMIC. Both of these PMICs have the same
> max77620 RTC controller.
> 
> For the max77620 RTC, the variable 'rtc_irq_from_platform' is defined as
> true in the max77686 driver and because of this the IRQ passed to the
> max77686 driver for RTC is the PMIC IRQ and not the parent. Hence,
> following commit d8f090dbeafd ("rtc: max77686: Do not allow interrupt to
> fire before system resume"), for the max77620 the RTC IRQ within the
> PMIC is now getting disabled on entry to suspend and unable to wake the
> system up. Fix this by only disabling interrupts on entry to suspend
> in the max77686 RTC driver, if the interrupt is the parent interrupt.

Applied, thanks!

[1/1] rtc: max77686: Fix wake-ups for max77620
      commit: 16c24801122e2961c588562f04707b98f9c84bbb

Best regards,
-- 
Alexandre Belloni <alexandre.belloni@bootlin.com>