linux-kernel - Re: [PATCH v8 01/11] PCI: imx6: Fix establish link failure in EP mode for iMX8MM and iMX8MP

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Message-ID: <ZtZCxrrVCfPKHdvJ@lizhi-Precision-Tower-5810>
Date: Mon, 2 Sep 2024 18:57:10 -0400
From: Frank Li <Frank.li@....com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-pci@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v8 01/11] PCI: imx6: Fix establish link failure in EP
 mode for iMX8MM and iMX8MP

On Mon, Sep 02, 2024 at 03:59:34PM -0500, Bjorn Helgaas wrote:
> On Mon, Jul 29, 2024 at 04:18:08PM -0400, Frank Li wrote:
> > From: Richard Zhu <hongxing.zhu@....com>
> >
> > Add IMX6_PCIE_FLAG_HAS_APP_RESET flag to IMX8MM_EP and IMX8MP_EP drvdata.
> > This flag was overlooked during code restructuring. It is crucial to
> > release the app-reset from the System Reset Controller before initiating
> > LTSSM to rectify the issue
>
> What exactly is the issue?  What does it look like to a user?  The
> endpoint doesn't establish a link correctly?

Yes. Link can't establish.

>
> > Fixes: 0c9651c21f2a ("PCI: imx6: Simplify reset handling by using *_FLAG_HAS_*_RESET")
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > Signed-off-by: Frank Li <Frank.Li@....com>
>
> Does this need a -stable tag?

Yes.

Do I need repost it?

Frank

>
> 0c9651c21f2a appeared in v6.9, but this could arguably be v6.11
> material if it fixes a serious issue.
>
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 964d67756eb2b..42fd17fbadfa5 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -1562,7 +1562,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> >  	},
> >  	[IMX8MM_EP] = {
> >  		.variant = IMX8MM_EP,
> > -		.flags = IMX6_PCIE_FLAG_HAS_PHYDRV,
> > +		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> > +			 IMX6_PCIE_FLAG_HAS_PHYDRV,
> >  		.mode = DW_PCIE_EP_TYPE,
> >  		.gpr = "fsl,imx8mm-iomuxc-gpr",
> >  		.clk_names = imx8mm_clks,
> > @@ -1573,7 +1574,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> >  	},
> >  	[IMX8MP_EP] = {
> >  		.variant = IMX8MP_EP,
> > -		.flags = IMX6_PCIE_FLAG_HAS_PHYDRV,
> > +		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> > +			 IMX6_PCIE_FLAG_HAS_PHYDRV,
> >  		.mode = DW_PCIE_EP_TYPE,
> >  		.gpr = "fsl,imx8mp-iomuxc-gpr",
> >  		.clk_names = imx8mm_clks,
> >
> > --
> > 2.34.1
> >