linux-kernel - Re: [PATCH v4 4/6] PCI: dwc: Only skip the dw_pcie_wait_for

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Message-ID: <069fdf2e-7674-4443-9ecb-849793cb0ecd@rock-chips.com>
Date: Wed, 7 Jan 2026 16:38:39 +0800
From: Shawn Lin <shawn.lin@...k-chips.com>
To: manivannan.sadhasivam@....qualcomm.com, Jingoo Han
 <jingoohan1@...il.com>, Manivannan Sadhasivam <mani@...nel.org>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: shawn.lin@...k-chips.com, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, vincent.guittot@...aro.org,
 zhangsenchuan@...incomputing.com, Richard Zhu <hongxing.zhu@....com>
Subject: Re: [PATCH v4 4/6] PCI: dwc: Only skip the dw_pcie_wait_for_link()
 failure if it returns -ENODEV


在 2026/01/07 星期三 16:11, Manivannan Sadhasivam via B4 Relay 写道:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> 
> dw_pcie_wait_for_link() now returns -ENODEV if the device is not found on
> the bus and -ETIMEDOUT if the link fails to come up for any other reasons.
> And it is incorrect to skip the link up failures other than device not
> found. So only skip the failure for device not found case and handle
> failure for other reasons.
> 

Reviewed-by: Shawn Lin <shawn.lin@...k-chips.com>


> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> ---
>   drivers/pci/controller/dwc/pcie-designware-host.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index fad0cbedefbc..ccde12b85463 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -675,8 +675,10 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>   			goto err_remove_edma;
>   	}
>   
> -	/* Ignore errors, the link may come up later */
> -	dw_pcie_wait_for_link(pci);
> +	/* Skip failure if the device is not found as it may show up later */
> +	ret = dw_pcie_wait_for_link(pci);
> +	if (ret && ret != -ENODEV)
> +		goto err_stop_link;
>   
>   	ret = pci_host_probe(bridge);
>   	if (ret)
>