linux-kernel - Re: [PATCH v2] PCI: Disable D3cold support on Intel XMM7360

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Date:   Mon, 12 Apr 2021 16:18:16 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] PCI: Disable D3cold support on Intel XMM7360

On Mon, Mar 29, 2021 at 1:23 PM Kai-Heng Feng
<kai.heng.feng@...onical.com> wrote:
>
> On some platforms, the root port for Intel XMM7360 WWAN supports D3cold.
> When the root port is put to D3cold by system suspend or runtime
> suspend, attempt to systems resume or runtime resume will freeze the
> laptop for a while, then it automatically shuts down.
>
> The root cause is unclear for now, as the Intel XMM7360 doesn't have a
> driver yet.
>
> So disable D3cold for XMM7360 as a workaround, until proper device
> driver is in place.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=212419
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

A gentle ping...

> ---
> v2:
>  - Add comment.
>
>  drivers/pci/quirks.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 653660e3ba9e..c48b0b4a4164 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5612,3 +5612,16 @@ static void apex_pci_fixup_class(struct pci_dev *pdev)
>  }
>  DECLARE_PCI_FIXUP_CLASS_HEADER(0x1ac1, 0x089a,
>                                PCI_CLASS_NOT_DEFINED, 8, apex_pci_fixup_class);
> +
> +/*
> + * Device [8086:7360]
> + * When it resumes from D3cold, system freeze and shutdown happens.
> + * Currently there's no driver for XMM7360, so add it as a PCI quirk.
> + * https://bugzilla.kernel.org/show_bug.cgi?id=212419
> + */
> +static void pci_fixup_no_d3cold(struct pci_dev *pdev)
> +{
> +       pci_info(pdev, "disable D3cold\n");
> +       pci_d3cold_disable(pdev);
> +}
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x7360, pci_fixup_no_d3cold);
> --
> 2.30.2
>