linux-kernel - Re: [RFC PATCH v6 0/5] Bluetooth: Handle system suspend gracefully

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Message-ID: <CANFp7mV-0HjEzYwh4LacMPOJCqgF1=1zwQ66e+8Hd6pODa3dMQ@mail.gmail.com>
Date:   Wed, 11 Mar 2020 10:20:16 -0700
From:   Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Alain Michaud <alainm@...omium.org>,
        Bluez mailing list <linux-bluetooth@...r.kernel.org>,
        ChromeOS Bluetooth Upstreaming 
        <chromeos-bluetooth-upstreaming@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Johan Hedberg <johan.hedberg@...il.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [RFC PATCH v6 0/5] Bluetooth: Handle system suspend gracefully

Let's continue the discussion on the bluez list.

I will update the patch series so that the "set_wake_capable"
management change is last in the series there as well and send out an
update today.

Thanks
Abhishek

On Wed, Mar 11, 2020 at 10:05 AM Marcel Holtmann <marcel@...tmann.org> wrote:
>
> Hi Abhishek,
>
> > This patch series prepares the Bluetooth controller for system suspend
> > by disconnecting all devices and preparing the event filter and LE
> > whitelist with devices that can wake the system from suspend.
> >
> > The main motivation for doing this is so we can enable Bluetooth as
> > a wake up source during suspend without it being noisy. Bluetooth should
> > wake the system when a HID device receives user input but otherwise not
> > send any events to the host.
> >
> > This patch series was tested on several Chromebooks with both btusb and
> > hci_serdev on kernel 4.19. The set of tests was basically the following:
> > * Reconnects after suspend succeed
> > * HID devices can wake the system from suspend (needs some related bluez
> >  changes to call the Set Wake Capable management command)
> > * System properly pauses and unpauses discovery + advertising around
> >  suspend
> > * System does not wake from any events from non wakeable devices
> >
> > Series 2 has refactored the change into multiple smaller commits as
> > requested. I tried to simplify some of the whitelist filtering edge
> > cases but unfortunately it remains quite complex.
> >
> > Series 3 has refactored it further and should have resolved the
> > whitelisting complexity in series 2.
> >
> > Series 4 adds a fix to check for powered down and powering down adapters.
> >
> > Series 5 moves set_wake_capable to the last patch in the series and
> > changes BT_DBG to bt_dev_dbg.
> >
> > Please review and provide any feedback.
> >
> > Thanks
> > Abhishek
> >
> >
> > Changes in v6:
> > * Removed unused variables in hci_req_prepare_suspend
> > * Add int old_state to this patch
> >
> > Changes in v5:
> > * Convert BT_DBG to bt_dev_dbg
> > * Added wakeable list and changed BT_DBG to bt_dev_dbg
> > * Add wakeable to hci_conn_params and change BT_DBG to bt_dev_dbg
> > * Changed BT_DBG to bt_dev_dbg
> > * Wakeable entries moved to other commits
> > * Patch moved to end of series
> >
> > Changes in v4:
> > * Added check for mgmt_powering_down and hdev_is_powered in notifier
> >
> > Changes in v3:
> > * Refactored to only handle BR/EDR devices
> > * Split LE changes into its own commit
> > * Added wakeable property to le_conn_param
> > * Use wakeable list for BR/EDR and wakeable property for LE
> >
> > Changes in v2:
> > * Moved pm notifier registration into its own patch and moved params out
> >  of separate suspend_state
> > * Refactored filters and whitelist settings to its own patch
> > * Refactored update_white_list to have clearer edge cases
> > * Add connected devices to whitelist (previously missing corner case)
> > * Refactored pause discovery + advertising into its own patch
> >
> > Abhishek Pandit-Subedi (5):
> >  Bluetooth: Handle PM_SUSPEND_PREPARE and PM_POST_SUSPEND
> >  Bluetooth: Handle BR/EDR devices during suspend
> >  Bluetooth: Handle LE devices during suspend
> >  Bluetooth: Pause discovery and advertising during suspend
> >  Bluetooth: Add mgmt op set_wake_capable
> >
> > include/net/bluetooth/hci.h      |  17 +-
> > include/net/bluetooth/hci_core.h |  43 ++++
> > include/net/bluetooth/mgmt.h     |   7 +
> > net/bluetooth/hci_core.c         | 102 ++++++++++
> > net/bluetooth/hci_event.c        |  24 +++
> > net/bluetooth/hci_request.c      | 331 ++++++++++++++++++++++++++-----
> > net/bluetooth/hci_request.h      |   2 +
> > net/bluetooth/mgmt.c             |  92 +++++++++
> > 8 files changed, 558 insertions(+), 60 deletions(-)
>
> patches 1-4 have been applied to bluetooth-next tree.
>
> I skipped patch 5 since now we have to discuss how best the API for setting the wakeable devices will be. Care to start up a discussion thread for that?
>
> Regards
>
> Marcel
>