linux-kernel - [PATCH v2 RESEND] i2c: cadence: Add system suspend and resume PM support

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Date: Fri, 19 Jan 2024 09:33:26 +0800
From: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
To: Michal Simek <michal.simek@....com>,
	Andi Shyti <andi.shyti@...nel.org>
Cc: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>,
	Ley Foon Tan <leyfoon.tan@...rfivetech.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 RESEND] i2c: cadence: Add system suspend and resume PM support

Enable device system suspend and resume PM support, and mark the device
state as suspended during system suspend to reject any data transfer.

Signed-off-by: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
---
Initial v2 was archived, previous discussion can be found in [1].
[1]: https://lore.kernel.org/all/20231209131516.1916550-1-jisheng.teoh@starfivetech.com/

Changes since v1:
- Add missing err assignment in cdns_i2c_resume().
---
 drivers/i2c/busses/i2c-cadence.c | 33 ++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index de3f58b60dce..4bb7d6756947 100644
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -1176,6 +1176,18 @@ static int __maybe_unused cdns_i2c_runtime_suspend(struct device *dev)
 	return 0;
 }
 
+static int __maybe_unused cdns_i2c_suspend(struct device *dev)
+{
+	struct cdns_i2c *xi2c = dev_get_drvdata(dev);
+
+	i2c_mark_adapter_suspended(&xi2c->adap);
+
+	if (!pm_runtime_status_suspended(dev))
+		return cdns_i2c_runtime_suspend(dev);
+
+	return 0;
+}
+
 /**
  * cdns_i2c_init -  Controller initialisation
  * @id:		Device private data structure
@@ -1219,7 +1231,28 @@ static int __maybe_unused cdns_i2c_runtime_resume(struct device *dev)
 	return 0;
 }
 
+static int __maybe_unused cdns_i2c_resume(struct device *dev)
+{
+	struct cdns_i2c *xi2c = dev_get_drvdata(dev);
+	int err;
+
+	err = cdns_i2c_runtime_resume(dev);
+	if (err)
+		return err;
+
+	if (pm_runtime_status_suspended(dev)) {
+		err = cdns_i2c_runtime_suspend(dev);
+		if (err)
+			return err;
+	}
+
+	i2c_mark_adapter_resumed(&xi2c->adap);
+
+	return 0;
+}
+
 static const struct dev_pm_ops cdns_i2c_dev_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cdns_i2c_suspend, cdns_i2c_resume)
 	SET_RUNTIME_PM_OPS(cdns_i2c_runtime_suspend,
 			   cdns_i2c_runtime_resume, NULL)
 };
-- 
2.43.0