linux-kernel - Re: [PATCH] PCI: layerscape: fix index passed to syscon_regmap_lookup_by_phandle

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Message-ID: <Z+VwWRWh3mn8bJqE@lizhi-Precision-Tower-5810>
Date: Thu, 27 Mar 2025 11:35:53 -0400
From: Frank Li <Frank.li@....com>
To: Ioana Ciornei <ioana.ciornei@....com>, bhelgaas@...gle.com
Cc: Roy Zang <roy.zang@....com>, Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-pci@...r.kernel.org, imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: layerscape: fix index passed to
 syscon_regmap_lookup_by_phandle_args

On Thu, Mar 27, 2025 at 05:19:49PM +0200, Ioana Ciornei wrote:
> The arg_count variable passed to the
> syscon_regmap_lookup_by_phandle_args() function represents the number of
> argument cells following the phandle. In this case, the number of
> arguments should be 1 instead of 2 since the dt property looks like
> below.
> 	fsl,pcie-scfg = <&scfg 0>;
>
> Without this fix, layerscape-pcie fails with the following message on
> LS1043A:
>
> [    0.157041] OF: /soc/pcie@...0000: phandle scfg@...0000 needs 2, found 1
> [    0.157050] layerscape-pcie 3500000.pcie: No syscfg phandle specified
> [    0.157053] layerscape-pcie 3500000.pcie: probe with driver layerscape-pcie failed with error -22
>
> Fixes: 149fc35734e5 ("PCI: layerscape: Use syscon_regmap_lookup_by_phandle_args")
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> ---

Bjorn:
	This is hot fix for some layerscape platform, which block pcie
functions. 149fc35734e5 still in v6.14 next.

Reviewed-by: Frank Li <Frank.Li@....com>

>  drivers/pci/controller/dwc/pci-layerscape.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
> index 239a05b36e8e..a44b5c256d6e 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -356,7 +356,7 @@ static int ls_pcie_probe(struct platform_device *pdev)
>  	if (pcie->drvdata->scfg_support) {
>  		pcie->scfg =
>  			syscon_regmap_lookup_by_phandle_args(dev->of_node,
> -							     "fsl,pcie-scfg", 2,
> +							     "fsl,pcie-scfg", 1,
>  							     index);
>  		if (IS_ERR(pcie->scfg)) {
>  			dev_err(dev, "No syscfg phandle specified\n");
> --
> 2.34.1
>