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From:   Andreas Kemnade <andreas@kemnade.info>
To:     tony@atomide.com, lee.jones@linaro.org, linux-omap@vger.kernel.org,
        linux-kernel@vger.kernel.org, Wolfram Sang <wsa@the-dreams.de>,
        linux-i2c@vger.kernel.org, Dave Gerlach <d-gerlach@ti.com>,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        Keerthy <j-keerthy@ti.com>, Tero Kristo <t-kristo@ti.com>,
        letux-kernel@openphoenux.org
Cc:     Andreas Kemnade <andreas@kemnade.info>
Subject: [PATCH] mfd: twl-core: disable irq while suspended
Date:   Sat, 23 Feb 2019 12:47:54 +0100
Message-Id: <20190223114754.16286-1-andreas@kemnade.info>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Since commit
6e2bd956936 ("i2c: omap: Use noirq system sleep pm ops to idle device for suspend")
on gta04 we have handle_twl4030_pih() called in situations where pm_runtime_get()
in i2c-omap.c returns -EACCES.
[   86.474365] Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done.
[   86.485473] printk: Suspending console(s) (use no_console_suspend to debug)
[   86.555572] Disabling non-boot CPUs ...
[   86.555664] Successfully put all powerdomains to target state
[   86.563720] twl: Read failed (mod 1, reg 0x01 count 1)
[   86.563751] twl4030: I2C error -13 reading PIH ISR
[   86.563812] twl: Read failed (mod 1, reg 0x01 count 1)
[   86.563812] twl4030: I2C error -13 reading PIH ISR
[   86.563873] twl: Read failed (mod 1, reg 0x01 count 1)
[   86.563903] twl4030: I2C error -13 reading PIH ISR

This happens when we wakeup via something behing twl4030
(powerbutton or rtc alarm).
This goes on for minutes until the system is finally resumed.
Disable the irq on suspend and enable it on resume to avoid
having i2c access problems when the irq registers are checked.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 drivers/mfd/twl-core.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 299016bc46d9..104477b512a2 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -1245,6 +1245,28 @@ twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	return status;
 }
 
+static int __maybe_unused twl_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	if (client->irq)
+		disable_irq(client->irq);
+
+	return 0;
+}
+
+static int __maybe_unused twl_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	if (client->irq)
+		enable_irq(client->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(twl_dev_pm_ops, twl_suspend, twl_resume);
+
 static const struct i2c_device_id twl_ids[] = {
 	{ "twl4030", TWL4030_VAUX2 },	/* "Triton 2" */
 	{ "twl5030", 0 },		/* T2 updated */
@@ -1262,6 +1284,7 @@ static const struct i2c_device_id twl_ids[] = {
 /* One Client Driver , 4 Clients */
 static struct i2c_driver twl_driver = {
 	.driver.name	= DRIVER_NAME,
+	.driver.pm	= &twl_dev_pm_ops,
 	.id_table	= twl_ids,
 	.probe		= twl_probe,
 	.remove		= twl_remove,
-- 
2.11.0