linux-kernel - Re: [PATCH] PCI: Avoid ASMedia XHCI USB PME# from D0 defect

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Message-Id: <DECD6DEE-E67C-43BA-8510-067ADBFBD50E@canonical.com>
Date:   Wed, 5 Feb 2020 01:08:00 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Avoid ASMedia XHCI USB PME# from D0 defect

Hi Bjorn,

> On Dec 20, 2019, at 03:20, Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
> 
> The ASMedia USB XHCI Controller claims to support generating PME# while
> in D0:
> 
> 01:00.0 USB controller: ASMedia Technology Inc. Device 2142 (prog-if 30 [XHCI])
>        Subsystem: SUNIX Co., Ltd. Device 312b
>        Capabilities: [78] Power Management version 3
>                Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot-,D3cold-)
>                Status: D0 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME-
> 
> However PME# only gets asserted when plugging USB 2.0 or USB 1.1
> devices, but not for USB 3.0 devices.
> 
> So remove PCI_PM_CAP_PME_D0 to avoid using PME under D0.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205919
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Would it be possible to merge this patch? Thanks.

Kai-Heng

> ---
> drivers/pci/quirks.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 79379b4c9d7a..24c71555dc77 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5436,3 +5436,14 @@ static void quirk_reset_lenovo_thinkpad_p50_nvgpu(struct pci_dev *pdev)
> DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_NVIDIA, 0x13b1,
> 			      PCI_CLASS_DISPLAY_VGA, 8,
> 			      quirk_reset_lenovo_thinkpad_p50_nvgpu);
> +
> +/*
> + * Device [1b21:2142]
> + * When in D0, PME# doesn't get asserted when plugging USB 3.0 device.
> + */
> +static void pci_fixup_no_d0_pme(struct pci_dev *dev)
> +{
> +	pci_info(dev, "PME# does not work under D0, disabling it\n");
> +	dev->pme_support &= ~(PCI_PM_CAP_PME_D0 >> PCI_PM_CAP_PME_SHIFT);
> +}
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x2142, pci_fixup_no_d0_pme);
> -- 
> 2.17.1
>