linux-kernel - Re: [PATCH 3.8 23/81] PCI: Enable INTx if BIOS left them disabled

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Message-ID: <CAErSpo6iSiYn0pcv86c3srAXHznYf_Xdqa+yJnhz_BezgXmeig@mail.gmail.com>
Date:	Tue, 25 Mar 2014 12:34:26 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Kamal Mostafa <kamal@...onical.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	kernel-team@...ts.ubuntu.com,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: Re: [PATCH 3.8 23/81] PCI: Enable INTx if BIOS left them disabled

On Tue, Mar 25, 2014 at 11:15 AM, Kamal Mostafa <kamal@...onical.com> wrote:
> 3.8.13.20 -stable review patch.  If anyone has any objections, please let me know.

If you pick up this one, you need the follow-up fix as well:

866d54177b4e671cd52bed1fb487d140d7b691f5 PCI: Enable INTx in
pci_reenable_device() only when MSI/MSI-X not enabled


> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> commit 1f42db786b14a31bf807fc41ee5583a00c08fcb1 upstream.
>
> Some firmware leaves the Interrupt Disable bit set even if the device uses
> INTx interrupts.  Clear Interrupt Disable so we get those interrupts.
>
> Based on the report mentioned below, if the user selects the "EHCI only"
> option in the Intel Baytrail BIOS, the EHCI device is handed off to the OS
> with the PCI_COMMAND_INTX_DISABLE bit set.
>
> Link: http://lkml.kernel.org/r/20140114181721.GC12126@xanatos
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=70601
> Reported-by: Chris Cheng <chris.cheng@...ustcorp.com>
> Reported-and-tested-by: Jamie Chen <jamie.chen@...el.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> CC: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
> Signed-off-by: Kamal Mostafa <kamal@...onical.com>
> ---
>  drivers/pci/pci.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index d1b4e00..4235728 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -1126,6 +1126,8 @@ EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state);
>  static int do_pci_enable_device(struct pci_dev *dev, int bars)
>  {
>         int err;
> +       u16 cmd;
> +       u8 pin;
>
>         err = pci_set_power_state(dev, PCI_D0);
>         if (err < 0 && err != -EIO)
> @@ -1135,6 +1137,14 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars)
>                 return err;
>         pci_fixup_device(pci_fixup_enable, dev);
>
> +       pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
> +       if (pin) {
> +               pci_read_config_word(dev, PCI_COMMAND, &cmd);
> +               if (cmd & PCI_COMMAND_INTX_DISABLE)
> +                       pci_write_config_word(dev, PCI_COMMAND,
> +                                             cmd & ~PCI_COMMAND_INTX_DISABLE);
> +       }
> +
>         return 0;
>  }
>
> --
> 1.8.3.2
>
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