From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Wed, 13 Dec 2017 09:14:29 +0100 From: Johan Hovold To: alexander.levin@verizon.com Cc: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , Johan Hovold , Marcel Holtmann Subject: Re: [PATCH AUTOSEL for 4.14 19/60] Bluetooth: avoid silent hci_bcm ACPI PM regression Message-ID: <20171213081429.GC5185@localhost> References: <20171213015455.6455-1-alexander.levin@verizon.com> <20171213015455.6455-19-alexander.levin@verizon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20171213015455.6455-19-alexander.levin@verizon.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: On Wed, Dec 13, 2017 at 01:55:14AM +0000, alexander.levin@verizon.com wrote: > From: Johan Hovold > > [ Upstream commit 4294625e029028854596865be401b9c5c1f906ef ] > > The hci_bcm platform-device hack which was used to implement > power management for ACPI devices is being replaced by a > serial-device-bus implementation. > > Unfortunately, when the corresponding change to the ACPI code lands (a > change that will stop enumerating and registering the serial-device-node > child as a platform device) PM will break silently unless serdev > TTY-port controller support has been enabled. Specifically, hciattach > (btattach) would still succeed, but power management would no longer > work. This one is not needed in stable, which does not have the above mentioned ACPI change [ e361d1f85855 ("ACPI / scan: Fix enumeration for special UART devices") ]. The Fixes and stable-CC tags were left out on purpose. Johan