linux-kernel - Re: [PATCH v14 12/17] PCI: imx6: Mark the link down as non-fatal error

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Message-ID: <cf3ee1c46da73693a05ecc81ddd3bf81d4d8f185.camel@pengutronix.de>
Date:   Wed, 13 Jul 2022 10:44:50 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Richard Zhu <hongxing.zhu@....com>, bhelgaas@...gle.com,
        robh+dt@...nel.org, broonie@...nel.org, lorenzo.pieralisi@....com,
        festevam@...il.com, francesco.dolcini@...adex.com
Cc:     linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        linux-imx@....com
Subject: Re: [PATCH v14 12/17] PCI: imx6: Mark the link down as non-fatal
 error

Am Freitag, dem 01.07.2022 um 11:25 +0800 schrieb Richard Zhu:
> Let the driver probe successfully, return zero in imx6_pcie_start_link()
> when PCIe link is down.
> 
> Link: https://lore.kernel.org/r/1655189942-12678-7-git-send-email-hongxing.zhu@nxp.com
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 0b168f0d57b8..e236f824c808 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -836,7 +836,9 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
>  	/* Start LTSSM. */
>  	imx6_pcie_ltssm_enable(dev);
>  
> -	dw_pcie_wait_for_link(pci);
> +	ret = dw_pcie_wait_for_link(pci);
> +	if (ret)
> +		goto err_reset_phy;
>  
>  	if (pci->link_gen == 2) {
>  		/* Allow Gen2 mode after the link is up. */
> @@ -872,7 +874,9 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
>  		}
>  
>  		/* Make sure link training is finished as well! */
> -		dw_pcie_wait_for_link(pci);
> +		ret = dw_pcie_wait_for_link(pci);
> +		if (ret)
> +			goto err_reset_phy;
>  	} else {
>  		dev_info(dev, "Link: Gen2 disabled\n");
>  	}
> @@ -886,7 +890,7 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
>  		dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0),
>  		dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1));
>  	imx6_pcie_reset_phy(imx6_pcie);
> -	return ret;
> +	return 0;
>  }
>  
>  static int imx6_pcie_host_init(struct pcie_port *pp)