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Date: Fri, 16 Feb 2024 16:46:32 +0530
From: Siddharth Vadapalli <s-vadapalli@ti.com>
To: =?utf-8?B?VGjDqW8=?= Lebrun <theo.lebrun@bootlin.com>
CC: Siddharth Vadapalli <s-vadapalli@ti.com>,
        Thomas Richard
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Subject: Re: [PATCH v3 18/18] PCI: j721e: add suspend and resume support
Message-ID: <8d47e1d0-69a3-475e-8dd8-64514872e026@ti.com>
References: <20240102-j7200-pcie-s2r-v3-0-5c2e4a3fac1f@bootlin.com>
 <20240102-j7200-pcie-s2r-v3-18-5c2e4a3fac1f@bootlin.com>
 <aa791703-81d8-420c-ba35-c8fd08bc3f07@ti.com>
 <CZ6GG6OQUJTX.2OM5TC9YLOAXV@bootlin.com>
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In-Reply-To: <CZ6GG6OQUJTX.2OM5TC9YLOAXV@bootlin.com>

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@bootlin.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.