linux-kernel - Re: [PATCH v4 2/7] PCI: imx6: Skip one dw_pcie_wait_for

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Message-ID: <Z+7q/okGW9uBlT/w@lizhi-Precision-Tower-5810>
Date: Thu, 3 Apr 2025 16:09:34 -0400
From: Frank Li <Frank.li@....com>
To: Richard Zhu <hongxing.zhu@....com>
Cc: l.stach@...gutronix.de, lpieralisi@...nel.org, kw@...ux.com,
	manivannan.sadhasivam@...aro.org, robh@...nel.org,
	bhelgaas@...gle.com, shawnguo@...nel.org, s.hauer@...gutronix.de,
	kernel@...gutronix.de, festevam@...il.com,
	iinux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/7] PCI: imx6: Skip one dw_pcie_wait_for_link() in
 workaround link training

On Thu, Apr 03, 2025 at 01:39:32PM +0800, Richard Zhu wrote:
> Skip one dw_pcie_wait_for_link() in workaround link training.

Remove one reduntant dw_pcie_wait_for_link() in link traning workaround
because common framework already do that.

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

>
> Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 15 ++++-----------
>  1 file changed, 4 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 57aa777231ae..84d2f94e3da0 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -881,11 +881,11 @@ static int imx_pcie_start_link(struct dw_pcie *pci)
>  	/* Start LTSSM. */
>  	imx_pcie_ltssm_enable(dev);
>
> -	ret = dw_pcie_wait_for_link(pci);
> -	if (ret)
> -		goto err_reset_phy;
> -
>  	if (pci->max_link_speed > 1) {
> +		ret = dw_pcie_wait_for_link(pci);
> +		if (ret)
> +			goto err_reset_phy;
> +
>  		/* Allow faster modes after the link is up */
>  		dw_pcie_dbi_ro_wr_en(pci);
>  		tmp = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
> @@ -907,17 +907,10 @@ static int imx_pcie_start_link(struct dw_pcie *pci)
>  			dev_err(dev, "Failed to bring link up!\n");
>  			goto err_reset_phy;
>  		}
> -
> -		/* Make sure link training is finished as well! */
> -		ret = dw_pcie_wait_for_link(pci);
> -		if (ret)
> -			goto err_reset_phy;
>  	} else {
>  		dev_info(dev, "Link: Only Gen1 is enabled\n");
>  	}
>
> -	tmp = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
> -	dev_info(dev, "Link up, Gen%i\n", tmp & PCI_EXP_LNKSTA_CLS);
>  	return 0;
>
>  err_reset_phy:
> --
> 2.37.1
>