linux-kernel - Re: [PATCH v2 1/5] PCI: iproc: Activate PAXC bridge quirk for more devices

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Date:   Wed, 11 Jul 2018 09:52:31 -0700
From:   Ray Jui <ray.jui@...adcom.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 1/5] PCI: iproc: Activate PAXC bridge quirk for more
 devices

Hi Bjorn,

On 7/11/2018 6:11 AM, Bjorn Helgaas wrote:
> On Mon, Jun 11, 2018 at 05:21:03PM -0700, Ray Jui wrote:
>> Activate PAXC bridge quirk for more PAXC based PCIe root complex with
>> the following PCIe device ID:
>> 0xd750, 0xd802, 0xd804
>>
>> Signed-off-by: Ray Jui <ray.jui@...adcom.com>
> 
> Because this quirk_paxc_bridge() mechanism is already established,
> 
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
> 

Thanks!

> BUT, I would push back on quirk_paxc_bridge() if it were new code.
> 
> I think it would be much better to implement this in the driver's
> config accessors so lspci would show the correct things and the
> generic code that deals with pcie_mpss would work unmodified.
>

Noted.

I agree with you. I'll find time to improve this by moving them into the 
driver's config accessors in the future, after v4.19.

>> ---
>>   drivers/pci/quirks.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index 2990ad1..47dfea0 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -2195,6 +2195,9 @@ static void quirk_paxc_bridge(struct pci_dev *pdev)
>>   }
>>   DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x16cd, quirk_paxc_bridge);
>>   DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x16f0, quirk_paxc_bridge);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0xd750, quirk_paxc_bridge);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0xd802, quirk_paxc_bridge);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0xd804, quirk_paxc_bridge);
>>   #endif
>>   
>>   /* Originally in EDAC sources for i82875P:
>> -- 
>> 2.1.4
>>