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From: Thomas Richard <thomas.richard@bootlin.com>
Date: Mon, 15 Jan 2024 17:14:44 +0100
Subject: [PATCH 03/14] i2c: omap: wakeup the controller during suspend
 callback
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Message-Id: <20240102-j7200-pcie-s2r-v1-3-84e55da52400@bootlin.com>
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To: Linus Walleij <linus.walleij@linaro.org>, 
 Bartosz Golaszewski <brgl@bgdev.pl>, Andy Shevchenko <andy@kernel.org>, 
 Tony Lindgren <tony@atomide.com>, 
 Haojian Zhuang <haojian.zhuang@linaro.org>, Vignesh R <vigneshr@ti.com>, 
 Aaro Koskinen <aaro.koskinen@iki.fi>, 
 Janusz Krzysztofik <jmkrzyszt@gmail.com>, 
 Andi Shyti <andi.shyti@kernel.org>, Peter Rosin <peda@axentia.se>, 
 Vinod Koul <vkoul@kernel.org>, Kishon Vijay Abraham I <kishon@kernel.org>, 
 Philipp Zabel <p.zabel@pengutronix.de>, Tom Joseph <tjoseph@cadence.com>, 
 Lorenzo Pieralisi <lpieralisi@kernel.org>, 
 =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= <kw@linux.com>, 
 Rob Herring <robh@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, 
 linux-i2c@vger.kernel.org, linux-phy@lists.infradead.org, 
 linux-pci@vger.kernel.org, gregory.clement@bootlin.com, 
 theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, 
 Thomas Richard <thomas.richard@bootlin.com>

A device may need the controller up during suspend_noirq or
resume_noirq.
But if the controller is autosuspended, there is no way to wakeup it
during suspend_noirq or resume_noirq because runtime pm is disabled
at this time.

The suspend callback wakes up the controller, so it is available until
its suspend_noirq callback (pm_runtime_force_suspend).
During the resume, it's restored by resume_noirq callback
(pm_runtime_force_resume). Then resume callback enables autosuspend.

So the controller is up during a little time slot in suspend and resume
sequences even if it's not used.

Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
---
 drivers/i2c/busses/i2c-omap.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 42165ef57946..57f0738fa748 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1575,9 +1575,24 @@ static int __maybe_unused omap_i2c_runtime_resume(struct device *dev)
 	return 0;
 }
 
+
+static int omap_i2c_suspend(struct device *dev)
+{
+	return pm_runtime_resume_and_get(dev);
+}
+
+static int omap_i2c_resume(struct device *dev)
+{
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
+	return 0;
+}
+
 static const struct dev_pm_ops omap_i2c_pm_ops = {
 	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 				      pm_runtime_force_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(omap_i2c_suspend, omap_i2c_resume)
 	SET_RUNTIME_PM_OPS(omap_i2c_runtime_suspend,
 			   omap_i2c_runtime_resume, NULL)
 };

-- 
2.39.2