From: Martin Kepplinger <martin.kepplinger@puri.sm>
To: rafael@kernel.org, khilman@kernel.org, ulf.hansson@linaro.org,
robh@kernel.org, krzysztof.kozlowski@linaro.org,
shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com,
pavel@ucw.cz
Cc: kernel@puri.sm, linux-imx@nxp.com, broonie@kernel.org,
l.stach@pengutronix.de, aford173@gmail.com,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Martin Kepplinger <martin.kepplinger@puri.sm>
Subject: [PATCH v6 1/2] power: domain: handle genpd correctly when needing interrupts
Date: Tue, 26 Jul 2022 10:32:56 +0200 [thread overview]
Message-ID: <20220726083257.1730630-2-martin.kepplinger@puri.sm> (raw)
In-Reply-To: <20220726083257.1730630-1-martin.kepplinger@puri.sm>
If for example the power-domains' power-supply node (regulator) needs
interrupts to work, the current setup with noirq callbacks cannot
work; for example a pmic regulator on i2c, when suspending, usually already
times out during suspend_noirq:
[ 41.024193] buck4: failed to disable: -ETIMEDOUT
So fix system suspend and resume for these power-domains by using the
"outer" suspend/resume callbacks instead. Tested on the imx8mq-librem5 board,
but by looking at the dts, this will fix imx8mq-evk and possibly many other
boards too.
This is designed so that genpd providers just say "this genpd needs
interrupts" (by setting the flag) - without implying an implementation.
Initially system suspend problems had been discussed at
https://lore.kernel.org/linux-arm-kernel/20211002005954.1367653-8-l.stach@pengutronix.de/
which led to discussing the pmic that contains the regulators which
serve as power-domain power-supplies:
https://lore.kernel.org/linux-pm/573166b75e524517782471c2b7f96e03fd93d175.camel@puri.sm/T/
Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
---
drivers/base/power/domain.c | 13 +++++++++++--
include/linux/pm_domain.h | 5 +++++
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 5a2e0232862e..58376752a4de 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -130,6 +130,7 @@ static const struct genpd_lock_ops genpd_spin_ops = {
#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN)
#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON)
+#define genpd_irq_on(genpd) (genpd->flags & GENPD_FLAG_IRQ_ON)
static inline bool irq_safe_dev_in_sleep_domain(struct device *dev,
const struct generic_pm_domain *genpd)
@@ -2065,8 +2066,15 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
genpd->domain.ops.runtime_resume = genpd_runtime_resume;
genpd->domain.ops.prepare = genpd_prepare;
- genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
- genpd->domain.ops.resume_noirq = genpd_resume_noirq;
+
+ if (genpd_irq_on(genpd)) {
+ genpd->domain.ops.suspend = genpd_suspend_noirq;
+ genpd->domain.ops.resume = genpd_resume_noirq;
+ } else {
+ genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
+ genpd->domain.ops.resume_noirq = genpd_resume_noirq;
+ }
+
genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
@@ -2769,6 +2777,7 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
goto err;
dev_gpd_data(dev)->default_pstate = pstate;
}
+
return 1;
err:
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index ebc351698090..9cdedbc21158 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -60,6 +60,10 @@
* GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its
* components' next wakeup when determining the
* optimal idle state.
+ *
+ * GENPD_FLAG_IRQ_ON: genpd needs irqs to be able to manage power
+ * on/off. Use the outer suspend/resume callbacks
+ * instead of noirq for example.
*/
#define GENPD_FLAG_PM_CLK (1U << 0)
#define GENPD_FLAG_IRQ_SAFE (1U << 1)
@@ -68,6 +72,7 @@
#define GENPD_FLAG_CPU_DOMAIN (1U << 4)
#define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5)
#define GENPD_FLAG_MIN_RESIDENCY (1U << 6)
+#define GENPD_FLAG_IRQ_ON (1U << 7)
enum gpd_status {
GENPD_STATE_ON = 0, /* PM domain is on */
--
2.30.2
next prev parent reply other threads:[~2022-07-26 8:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-26 8:32 [PATCH v6 0/2] power: domain: handle power supplies that need interrupts Martin Kepplinger
2022-07-26 8:32 ` Martin Kepplinger [this message]
2022-07-26 15:07 ` [PATCH v6 1/2] power: domain: handle genpd correctly when needing interrupts Ulf Hansson
2022-07-26 18:33 ` Rafael J. Wysocki
2022-07-28 9:19 ` Ulf Hansson
2022-08-19 9:17 ` Martin Kepplinger
2022-08-19 14:53 ` Ulf Hansson
2022-08-22 8:38 ` Martin Kepplinger
2022-08-24 13:30 ` Ulf Hansson
2022-08-25 7:06 ` Martin Kepplinger
2022-09-23 13:55 ` Ulf Hansson
2022-09-26 9:52 ` Martin Kepplinger
2023-06-21 18:20 ` Martin Kepplinger
2023-06-26 9:50 ` Ulf Hansson
2022-07-26 8:32 ` [PATCH v6 2/2] soc: imx: gpcv2: fix suspend/resume by setting GENPD_FLAG_IRQ_ON Martin Kepplinger
2022-07-26 15:08 ` Ulf Hansson
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