[PATCH] PCI: brcmstb: Assign pcie->gen from pcie_get_link_speed()

[Bjorn Helgaas]

On Fri, May 01, 2026 at 01:24:38PM -0700, Florian Fainelli wrote:
> After commit 03f920936977 ("PCI: controller: Validate max-link-speed"),
> pcie->gen stopped being assigned and as a result the established PCIe
> link would stop supporting Gen3 speeds on 2712 since pcie->gen is used
> to populate LnkCntl2 and LnkCap in brcm_pcie_set_gen().
> 
> Link: https://github.com/raspberrypi/linux/issues/7343
> Reported-by: Dom Cobley <popcornmix at gmail.com>
> Reported-by: Phil Elwell <phil at raspberrypi.com>
> Fixes: 03f920936977 ("PCI: controller: Validate max-link-speed")
> Signed-off-by: Florian Fainelli <florian.fainelli at broadcom.com>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index 714bcab97b60..6138fc4bc064 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -2072,8 +2072,7 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(pcie->clk);
>  
>  	ret = of_pci_get_max_link_speed(np);
> -	if (pcie_get_link_speed(ret) == PCI_SPEED_UNKNOWN)
> -		pcie->gen = 0;
> +	pcie->gen = pcie_get_link_speed(ret);

Take a look at https://sashiko.dev/#/patchset/20260501202438.376033-1-florian.fainelli%40broadcom.com

The notes at https://github.com/raspberrypi/linux/issues/7343 assumed
PCI_SPEED_UNKNOWN was 0, but in fact it is 0xff, which means you might
want the more defensive patch instead.

I'll be happy to replace what's on pci/for-linus if so.

>  	pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
>  
> -- 
> 2.43.0
>