linux-kernel - Re: [PATCH v3 18/18] PCI: j721e: add suspend and resume support

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Date: Fri, 16 Feb 2024 16:46:32 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Théo Lebrun <theo.lebrun@...tlin.com>
CC: Siddharth Vadapalli <s-vadapalli@...com>,
        Thomas Richard
	<thomas.richard@...tlin.com>,
        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>,
        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>,
        <thomas.petazzoni@...tlin.com>, <u-kumar1@...com>
Subject: Re: [PATCH v3 18/18] PCI: j721e: add suspend and resume support

On 24/02/16 12:09PM, Théo Lebrun wrote:
> Hello,
> 
> On Fri Feb 16, 2024 at 11:48 AM CET, Siddharth Vadapalli wrote:
> > On 24/02/15 04:18PM, Thomas Richard 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.
> >
> > Wouldn't this imply that the Endpoint device will be reset and therefore
> > lose context? Or is it expected that the driver corresponding to the
> > Endpoint Function in Linux will restore the state on resume, post reset?
> 
> This does imply exactly that. Endpoint driver must be able to restore
> context anyway, as system-wide suspend could mean lost power to PCI RC
> controller (eg suspend-to-RAM) or PCI rails (dependent on hardware).

Thank you for confirming.

Regards,
Siddharth.