linux-kernel - Re: [PATCH v2] PCI: imx6: Support more than Gen2 speed link mode

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Date:   Wed, 20 Jul 2022 16:15:41 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     l.stach@...gutronix.de, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, tharvey@...eworks.com,
        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 v2] PCI: imx6: Support more than Gen2 speed link mode

On Wed, Jul 20, 2022 at 11:26:16AM +0800, Richard Zhu wrote:
> Support more than Gen2 speed link mode, since i.MX8MP PCIe supports up to
> Gen3 link speed.
> 
> Link: https://lore.kernel.org/r/1652866528-13220-2-git-send-email-hongxing.zhu@nxp.com
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

You should not post patches with my signed-off-by.

I add my signed-off-by to patches when I merge them.

I applied this to pci/ctrl/imx6, replacing the v1 patch, thanks!

> ---
> Changes from v1:
> - The Supported Link Speeds of the PCI_EXP_LNKCAP should be re-configured too.
> - When only Gen1 is enabled, refine the dev_info accordingly.
> 
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index e1ba11dabaa8..b66876f7efe0 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -844,12 +844,12 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
>  	if (ret)
>  		goto err_reset_phy;
>  
> -	if (pci->link_gen == 2) {
> -		/* Allow Gen2 mode after the link is up. */
> +	if (pci->link_gen > 1) {
> +		/* 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);
>  		tmp &= ~PCI_EXP_LNKCAP_SLS;
> -		tmp |= PCI_EXP_LNKCAP_SLS_5_0GB;
> +		tmp |= pci->link_gen;
>  		dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, tmp);
>  
>  		/*
> @@ -884,7 +884,7 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
>  		if (ret)
>  			goto err_reset_phy;
>  	} else {
> -		dev_info(dev, "Link: Gen2 disabled\n");
> +		dev_info(dev, "Link: Only Gen1 is enabled\n");
>  	}
>  
>  	imx6_pcie->link_is_up = true;
> -- 
> 2.25.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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