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

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Message-ID: <20190205200957.GA7268@google.com>
Date:   Tue, 5 Feb 2019 14:09:57 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     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

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.

Bjorn