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Message-ID: <3b9dfb8d-af1d-4f5d-9554-d256008ed9bc@amd.com>
Date: Wed, 21 Aug 2024 15:59:58 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Mathias Nyman <mathias.nyman@...ux.intel.com>, superm1@...nel.org,
Mathias Nyman <mathias.nyman@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
Kai-Heng Feng <kai.heng.feng@...onical.com>, mika.westerberg@...ux.intel.com
Subject: Re: [PATCH 1/2] xhci: pci: If no ports have wakeup enabled then
disable PCI device at S4
On 8/21/2024 04:25, Mathias Nyman wrote:
> On 12.7.2024 21.54, superm1@...nel.org wrote:
>> From: Mario Limonciello <mario.limonciello@....com>
>>
>> If a port on an XHCI controller hasn't been marked for wakeup at S4, then
>> leaving it at D0 will needlessly consume power than necessary.
>>
>> Explicitly check ports configured for wakeup and if none are found then
>> put the controller into D3hot before hibernate.
>>
>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>> ---
>> drivers/usb/host/xhci-pci.c | 9 +++++++++
>> 1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
>> index 05881153883ec..4408d4caf66d2 100644
>> --- a/drivers/usb/host/xhci-pci.c
>> +++ b/drivers/usb/host/xhci-pci.c
>> @@ -823,6 +823,7 @@ static int xhci_pci_poweroff_late(struct usb_hcd
>> *hcd, bool do_wakeup)
>> struct usb_device *udev;
>> u32 portsc;
>> int i;
>> + bool wakeup = false;
>> /*
>> * Systems with XHCI_RESET_TO_DEFAULT quirk have boot firmware that
>> @@ -860,6 +861,14 @@ static int xhci_pci_poweroff_late(struct usb_hcd
>> *hcd, bool do_wakeup)
>> port->rhub->hcd->self.busnum, port->hcd_portnum + 1);
>> portsc = xhci_port_state_to_neutral(portsc);
>> writel(portsc | PORT_PE, port->addr);
>> + wakeup = true;
>> + }
>> +
>> + if (!wakeup) {
>> + struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
>> +
>> + xhci_shutdown(hcd);
>> + pci_set_power_state(pdev, PCI_D3hot);
>
> Not sure we should force D3 here.
> I think usb core will set the PCI D state in the next .poweroff_noirq
> stage,
>
> for s4:
> .poweroff = hcd_pci_suspend,
> .poweroff_late = hcd_pci_poweroff_late,
> .poweroff_noirq = hcd_pci_suspend_noirq,
>
> hcd_pci_suspend_noirq()
> pci_prepare_to_sleep();
> target_state = pci_target_state(dev, wakeup)
> pci_set_power_state(dev, target_state)
>
> Maybe the target_state isn't D3 for some reason? (missing ACPI entries?)
>
Thanks for looking.
Even a lack of ACPI entries *should* still lead to D3hot if wakeup is
turned off with that flow.
I'll add some more debugging for the various callbacks and see what I
can come up with to explain it.
Can you please also review the other patch in the series?
Thanks!
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