From: Lukas Wunner <lukas@wunner.de>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
Mario.Limonciello@dell.com,
Michael Jamet <michael.jamet@intel.com>,
Yehezkel Bernat <yehezkel.bernat@intel.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH v3 1/5] PCI: Make sure all bridges reserve at least one bus number
Date: Sat, 31 Mar 2018 12:18:16 +0200 [thread overview]
Message-ID: <20180331101816.GA18877@wunner.de> (raw)
In-Reply-To: <20180331095804.GU2703@lahna.fi.intel.com>
On Sat, Mar 31, 2018 at 12:58:04PM +0300, Mika Westerberg wrote:
> On Sat, Mar 31, 2018 at 11:30:17AM +0200, Lukas Wunner wrote:
> > > The whole point here is that those are *not* hotplug slots just regular
> > > downstream ports.
> >
> > Okay, understood. Is this about the NHI or XHCI? Because at least
> > on Alpine Ridge (C step), the bridge above the XHCI *is* a hotplug
> > bridge. Only the bridge above the NHI is not.
>
> Yes, exactly. I tried to clarify this mechanism a bit better in the
> other email I just sent.
But in the e-mail you just sent, the bridge above the XHCI is not a
hotplug bridge and according to the lspci output of a MacBookPro13,3
I have here, it *is* a hotplug bridge on Alpine Ridge (C step).
FWIW, the HDA controller integrated into Nvidia GPUs can be made
visible or hidden in a similar fashion by setting a bit in the
GPU's config space. Some laptop DSDTs use this to hide the HDA
controller on boot (and resume from system sleep) if no HDMI cable
is plugged in. I think this behavior is geared towards Windows'
driver model. On Linux it's mostly an annoyance and we're considering
un-hiding the HDA controller unconditionally from a PCI quirk:
https://bugs.freedesktop.org/show_bug.cgi?id=75985
Thanks,
Lukas
next prev parent reply other threads:[~2018-03-31 10:18 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-26 13:21 [PATCH v3 0/5] PCI: Fixes for native PCIe and ACPI hotplug Mika Westerberg
2018-02-26 13:21 ` [PATCH v3 1/5] PCI: Make sure all bridges reserve at least one bus number Mika Westerberg
2018-03-27 18:57 ` Bjorn Helgaas
2018-03-28 11:43 ` Mika Westerberg
2018-03-28 18:09 ` Bjorn Helgaas
2018-03-29 11:59 ` Mika Westerberg
2018-03-31 8:29 ` Lukas Wunner
2018-03-31 8:58 ` Mika Westerberg
2018-03-31 9:12 ` Lukas Wunner
2018-03-31 9:19 ` Rafael J. Wysocki
2018-03-31 9:20 ` Mika Westerberg
2018-03-31 9:30 ` Lukas Wunner
2018-03-31 9:58 ` Mika Westerberg
2018-03-31 10:18 ` Lukas Wunner [this message]
2018-03-31 10:37 ` Mika Westerberg
2018-03-31 9:30 ` Rafael J. Wysocki
2018-03-31 9:56 ` Mika Westerberg
2018-03-31 10:05 ` Rafael J. Wysocki
2018-03-31 10:12 ` Mika Westerberg
2018-02-26 13:21 ` [PATCH v3 2/5] PCI: Take bridge window alignment into account when distributing resources Mika Westerberg
2018-03-27 19:23 ` Bjorn Helgaas
2018-03-28 12:01 ` Mika Westerberg
2018-03-29 21:29 ` Bjorn Helgaas
2018-03-31 9:18 ` Mika Westerberg
2018-02-26 13:21 ` [PATCH v3 3/5] PCI: pciehp: Clear Presence Detect and Data Link Layer Status Changed on resume Mika Westerberg
2018-02-26 13:21 ` [PATCH v3 4/5] ACPI / hotplug / PCI: Do not scan all bridges when native PCIe hotplug is used Mika Westerberg
2018-02-26 13:21 ` [PATCH v3 5/5] ACPI / hotplug / PCI: Mark stale PCI devices disconnected Mika Westerberg
2018-03-27 19:45 ` Bjorn Helgaas
2018-03-27 20:52 ` Lukas Wunner
2018-03-27 22:13 ` Bjorn Helgaas
2018-03-28 6:25 ` Greg Kroah-Hartman
2018-02-26 15:16 ` [PATCH v3 0/5] PCI: Fixes for native PCIe and ACPI hotplug Andy Shevchenko
2018-03-15 6:00 ` Mika Westerberg
2018-03-26 10:01 ` Mika Westerberg
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