linux-kernel - Re: Linux Kernel Regression: HAPS quirk breaks PCIe on i.MX6QP

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Message-ID: <30102591E157244384E984126FC3CB4F639C0F73@us01wembx1.internal.synopsys.com>
Date:   Tue, 5 Feb 2019 20:38:58 +0000
From:   Thinh Nguyen <thinh.nguyen@...opsys.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Thinh Nguyen <thinh.nguyen@...opsys.com>
CC:     Lukas Wunner <lukas@...ner.de>,
        "Lukas F. Hartmann" <lukas@...mn.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Youn <john.youn@...opsys.com>
Subject: Re: Linux Kernel Regression: HAPS quirk breaks PCIe on i.MX6QP

Hi Bjorn,

Bjorn Helgaas wrote:
> On Fri, Feb 01, 2019 at 08:27:00PM +0000, Thinh Nguyen wrote:
>> Lukas Wunner wrote:
>>> On Thu, Jan 31, 2019 at 11:46:23PM +0000, Thinh Nguyen wrote:
>>>> --- a/drivers/pci/quirks.c
>>>> +++ b/drivers/pci/quirks.c
>>>> @@ -629,6 +629,9 @@ static void quirk_synopsys_haps(struct pci_dev *pdev)
>>>>  {
>>>>         u32 class = pdev->class;
>>>>  
>>>> +       if (class != PCI_CLASS_SERIAL_USB_XHCI)
>>>> +               return;
>>>> +
>>>>         switch (pdev->device) {
>>>>         case PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3:
>>>>         case PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI:
>>> Please use DECLARE_PCI_FIXUP_CLASS_HEADER() instead.
>> Sure. That's a better option. Can you test this with your setup?
>>
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index b0a413f3f7ca..f46e7de9e15d 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -639,8 +639,8 @@ static void quirk_synopsys_haps(struct pci_dev *pdev)
>>                 break;
>>         }
>>  }
>> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SYNOPSYS, PCI_ANY_ID,
>> -                        quirk_synopsys_haps);
>> +DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_SYNOPSYS, PCI_ANY_ID,
>> +               PCI_CLASS_SERIAL_USB_XHCI, 0, quirk_synopsys_haps);
>>  
>>  /*
>>   * Let's make the southbridge information explicit instead of having to
>>
>>
> Can we get a formal patch, including details about the issue (I assume
> Synopsys released two different parts with Device ID 0xabcd) and a
> signed-off-by?
>
> I'd like to get this into for-linus as soon as possible for v5.0.
>

I already submitted a patch for this. Please review patch subject
"[PATCH] PCI: Check for USB xHCI class for HAPS platform".

Thanks,
Thinh