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Message-ID: <31c42f08-7d5e-4b91-87e9-bfc7e2cfdefe@bootlin.com>
Date: Fri, 19 Jan 2024 18:01:33 +0100
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Subject: Re: [PATCH 01/14] gpio: pca953x: move suspend/resume to
 suspend_noirq/resume_noirq
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To: Tony Lindgren <tony@atomide.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
 Bartosz Golaszewski <brgl@bgdev.pl>, Andy Shevchenko <andy@kernel.org>,
 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>,
 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
References: <20240102-j7200-pcie-s2r-v1-0-84e55da52400@bootlin.com>
 <20240102-j7200-pcie-s2r-v1-1-84e55da52400@bootlin.com>
 <20240116074333.GO5185@atomide.com>
From: Thomas Richard <thomas.richard@bootlin.com>
In-Reply-To: <20240116074333.GO5185@atomide.com>
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Hello Tony,

On 1/16/24 08:43, Tony Lindgren wrote:
> * Thomas Richard <thomas.richard@bootlin.com> [240115 16:16]:
>> Some IOs can be needed during suspend_noirq/resume_noirq.
>> So move suspend/resume callbacks to noirq.
> 
> So have you checked that the pca953x_save_context() and restore works
> this way? There's i2c traffic and regulators may sleep.. I wonder if
> you instead just need to leave gpio-pca953x enabled in some cases
> instead?
> 

Yes I tested it, and it works (with my setup).
But this patch may have an impact for other people.
How could I leave it enabled in some cases ?

Regards,

-- 
Thomas Richard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com