linux-kernel - Re: [PATCH v2 15/15] PCI: j721e: add suspend and resume support

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Message-ID: <CAHp75Vfzvi-08DUvmBO8Lt1a-orozD+Z=YNOQJykJKWDZA5gGA@mail.gmail.com>
Date: Fri, 26 Jan 2024 23:55:03 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Andy Shevchenko <andy@...nel.org>, Tony Lindgren <tony@...mide.com>, 
	Haojian Zhuang <haojian.zhuang@...aro.org>, Vignesh R <vigneshr@...com>, 
	Aaro Koskinen <aaro.koskinen@....fi>, Janusz Krzysztofik <jmkrzyszt@...il.com>, 
	Andi Shyti <andi.shyti@...nel.org>, Peter Rosin <peda@...ntia.se>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Tom Joseph <tjoseph@...ence.com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org, 
	linux-phy@...ts.infradead.org, linux-pci@...r.kernel.org, 
	gregory.clement@...tlin.com, theo.lebrun@...tlin.com, 
	thomas.petazzoni@...tlin.com, u-kumar1@...com
Subject: Re: [PATCH v2 15/15] PCI: j721e: add suspend and resume support

On Fri, Jan 26, 2024 at 4:38 PM Thomas Richard
<thomas.richard@...tlin.com> wrote:
>
> From: Théo Lebrun <theo.lebrun@...tlin.com>
>
> Add suspend and resume support. Only the rc mode is supported.
>
> During the suspend stage PERST# is asserted, then deasserted during the
> resume stage.

..

> +static int j721e_pcie_suspend_noirq(struct device *dev)
> +{
> +       struct j721e_pcie *pcie = dev_get_drvdata(dev);
> +
> +       if (pcie->mode == PCI_MODE_RC) {
> +               gpiod_set_value_cansleep(pcie->reset_gpio, 0);
> +               clk_disable_unprepare(pcie->refclk);

Same Q as in a few mails before: Do you need unprepare? What will be
the benefit from a PM perspective?

> +       }
> +
> +       cdns_pcie_disable_phy(pcie->cdns_pcie);
> +
> +       return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko