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

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Message-ID: <ovaomfvo7b3uxoss3tzhrkgdy6cvxi4kr2zxmqsfjxds5qfohl@t6kc4rswq6gp>
Date: Wed, 2 Apr 2025 12:37:34 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Richard Zhu <hongxing.zhu@....com>
Cc: 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?

> 
> 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?

- Mani

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