linux-kernel - Re: [PATCH v4 1/5] PCI: dwc: Return -ENODEV from dw_pcie_wait_for

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Message-ID: <aXCMuCQXbcWOEqEn@ryzen>
Date: Wed, 21 Jan 2026 09:22:16 +0100
From: Niklas Cassel <cassel@...nel.org>
To: manivannan.sadhasivam@....qualcomm.com
Cc: 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>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	vincent.guittot@...aro.org, zhangsenchuan@...incomputing.com,
	Shawn Lin <shawn.lin@...k-chips.com>,
	Richard Zhu <hongxing.zhu@....com>
Subject: Re: [PATCH v4 1/5] PCI: dwc: Return -ENODEV from
 dw_pcie_wait_for_link() if device is not found

On Tue, Jan 20, 2026 at 11:17:40PM +0530, Manivannan Sadhasivam via B4 Relay wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> 
> The dw_pcie_wait_for_link() function waits up to 1 second for the PCIe link
> to come up and returns -ETIMEDOUT for all failures without distinguishing
> cases where no device is present on the bus. But the callers may want to
> just skip the failure if the device is not found on the bus and handle
> failure for other reasons.
> 
> So after timeout, if the LTSSM is in Detect.Quiet or Detect.Active state,
> return -ENODEV to indicate the callers that the device is not found on the
> bus and return -ETIMEDOUT otherwise.
> 
> Also add kernel doc to document the parameter and return values.
> 
> Tested-by: Richard Zhu <hongxing.zhu@....com>
> Tested-by: Vincent Guittot <vincent.guittot@...aro.org>
> Reviewed-by: Shawn Lin <shawn.lin@...k-chips.com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> ---

Reviewed-by: Niklas Cassel <cassel@...nel.org>