linux-kernel - Re: [PATCH] PCI: Extend PCI root port device IDs for Zhaoxin platforms

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Message-ID: <20231201155320.GA518898@bhelgaas>
Date:   Fri, 1 Dec 2023 09:53:20 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     LeoLiu-oc <LeoLiu-oc@...oxin.com>
Cc:     bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, CobeChen@...oxin.com,
        TonyWWang@...oxin.com, YeeLi@...oxin.com, Leoliu@...oxin.com
Subject: Re: [PATCH] PCI: Extend PCI root port device IDs for Zhaoxin
 platforms

On Fri, Dec 01, 2023 at 08:09:42PM +0800, LeoLiu-oc wrote:
> From: leoliu-oc <leoliu-oc@...oxin.com>
> 
> Add more PCI root port device IDs to the
> pci_quirk_zhaoxin_pcie_ports_acs() for some new Zhaoxin platforms.

Can you please add a note about the plan to deal with this for future
devices, e.g., something like "future Zhaoxin devices now in
development will advertise an ACS Capability as described in the
PCIe spec"?

The point of quirks is to work around hardware that is broken or
doesn't conform to the spec in some way.  We have to add quirks when
broken hardware is already in the field, but we should have a plan to
fix newer devices so they don't require quirks.

> Signed-off-by: leoliu-oc <leoliu-oc@...oxin.com>
> ---
>  drivers/pci/quirks.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index ea476252280a..db74f8f07096 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -4709,7 +4709,7 @@ static int  pci_quirk_zhaoxin_pcie_ports_acs(struct pci_dev *dev, u16 acs_flags)
>  	switch (dev->device) {
>  	case 0x0710 ... 0x071e:
>  	case 0x0721:
> -	case 0x0723 ... 0x0732:
> +	case 0x0723 ... 0x073b:
>  		return pci_acs_ctrl_enabled(acs_flags,
>  			PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);
>  	}
> -- 
> 2.34.1
>