linux-kernel - RE: [PATCH v3 3/6] PCI: imx6: Workaround i.MX95 PCIe may not exit L23 ready

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Message-ID:
 <AS8PR04MB8676BB3EDFCF3E5A490AC0628CAE2@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date: Thu, 3 Apr 2025 03:22:40 +0000
From: Hongxing Zhu <hongxing.zhu@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC: Frank Li <frank.li@....com>, "l.stach@...gutronix.de"
	<l.stach@...gutronix.de>, "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
	"kw@...ux.com" <kw@...ux.com>, "robh@...nel.org" <robh@...nel.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>, "shawnguo@...nel.org"
	<shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>, "festevam@...il.com"
	<festevam@...il.com>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 3/6] PCI: imx6: Workaround i.MX95 PCIe may not exit L23
 ready

> -----Original Message-----
> From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Sent: 2025年4月2日 23:18
> To: Hongxing Zhu <hongxing.zhu@....com>
> Cc: Frank Li <frank.li@....com>; l.stach@...gutronix.de; lpieralisi@...nel.org;
> kw@...ux.com; robh@...nel.org; bhelgaas@...gle.com;
> shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> festevam@...il.com; linux-pci@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; imx@...ts.linux.dev;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v3 3/6] PCI: imx6: Workaround i.MX95 PCIe may not exit L23
> ready
> 
> On Wed, Apr 02, 2025 at 07:59:26AM +0000, Hongxing Zhu wrote:
> > > -----Original Message-----
> > > From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > Sent: 2025年4月2日 15:08
> > > To: Hongxing Zhu <hongxing.zhu@....com>
> > > Cc: Frank Li <frank.li@....com>; l.stach@...gutronix.de;
> > > lpieralisi@...nel.org; kw@...ux.com; robh@...nel.org;
> > > bhelgaas@...gle.com; shawnguo@...nel.org; s.hauer@...gutronix.de;
> > > kernel@...gutronix.de; festevam@...il.com;
> > > linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> > > imx@...ts.linux.dev; linux-kernel@...r.kernel.org
> > > Subject: Re: [PATCH v3 3/6] PCI: imx6: Workaround i.MX95 PCIe may
> > > not exit L23 ready
> > >
> > > On Fri, Mar 28, 2025 at 11:02:10AM +0800, Richard Zhu wrote:
> > > > ERR051624: The Controller Without Vaux Cannot Exit L23 Ready
> > > > Through Beacon or PERST# De-assertion
> > >
> > > Is it possible to share the link to the erratum?
> > >
> > Sorry, the erratum document isn't ready to be published yet.
> > > >
> > > > When the auxiliary power is not available, the controller cannot
> > > > exit from
> > > > L23 Ready with beacon or PERST# de-assertion when main power is
> > > > not removed.
> > > >
> > >
> > > I don't understand how the presence of Vaux affects the controller.
> > > Same goes for PERST# deassertion. How does that relate to Vaux? Is
> > > this erratum for a specific endpoint behavior?
> > IMHO I don't know the exact details of the power supplies in this IP design.
> > Refer to my guess , maybe the beacon detect or wake-up logic in
> > designs is  relied on the status of SYS_AUX_PWR_DET signals in this case.
> 
> Can you please try to get more details? I couldn't understand the errata.
> 
Sure. Will contact designer and try to get more details.

Best Regards
Richard Zhu
> - Mani
> 
> --
> மணிவண்ணன் சதாசிவம்