linux-kernel - Re: [PATCH v1 2/2] PCI: dwc: Do stop link in the dw_pcie_suspend

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Message-ID: <20241003060942.af3nycevgtspzigj@thinkpad>
Date: Thu, 3 Oct 2024 11:39:42 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Richard Zhu <hongxing.zhu@....com>
Cc: jingoohan1@...il.com, kwilczynski@...nel.org, bhelgaas@...gle.com,
	lpieralisi@...nel.org, frank.li@....com, robh@...nel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev
Subject: Re: [PATCH v1 2/2] PCI: dwc: Do stop link in the
 dw_pcie_suspend_noirq

In subject,

s/Do/Always

On Wed, Sep 25, 2024 at 01:48:37PM +0800, Richard Zhu wrote:
> On i.MX8QM, PCIe link can't be re-established again in
> dw_pcie_resume_noirq(), if the LTSSM_EN bit is not cleared properly in
> dw_pcie_suspend_noirq().
> 
> Add dw_pcie_stop_link() into dw_pcie_suspend_noirq() to fix this issue and
> keep symmetric in suspend/resume function since there is
> dw_pcie_start_link() in dw_pcie_resume_noirq().
> 
> Fixes: 4774faf854f5 ("PCI: dwc: Implement generic suspend/resume functionality")
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index cb8c3c2bcc79..9ca33895456f 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -952,6 +952,7 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
>  		}
>  	}
>  
> +	dw_pcie_stop_link(pci);
>  	if (pci->pp.ops->deinit)
>  		pci->pp.ops->deinit(&pci->pp);
>  
> -- 
> 2.37.1
> 

-- 
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