From: Marcel Holtmann <marcel@holtmann.org>
To: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Cc: chromeos-bluetooth-upstreaming
<chromeos-bluetooth-upstreaming@chromium.org>,
Kai-Heng Feng <kai.heng.feng@canonical.com>,
Bluetooth Kernel Mailing List <linux-bluetooth@vger.kernel.org>,
Alex Lu <alex_lu@realsil.com.cn>,
linux-pm@vger.kernel.org, Johan Hedberg <johan.hedberg@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Revert "Bluetooth: btusb: Disable runtime suspend on Realtek devices"
Date: Thu, 30 Jul 2020 11:55:51 +0200 [thread overview]
Message-ID: <C006448A-9FE3-4F83-AB67-68973709C0C2@holtmann.org> (raw)
In-Reply-To: <20200729161740.1.Ib03d0827c8e48fc3df887fec698f79fa335c9274@changeid>
Hi Abhishek,
> This reverts commit 7ecacafc240638148567742cca41aa7144b4fe1e.
>
> Testing this change on a board with RTL8822CE, I found that enabling
> autosuspend has no effect on the stability of the system. The board
> continued working after autosuspend, suspend and reboot.
>
> The original commit makes it impossible to enable autosuspend on working
> systems so it should be reverted. Disabling autosuspend should be done
> via module param or udev in userspace instead.
>
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> ---
> We have a few Chromebooks using the RTL 8822CE part over USB and they
> are running without problems with autosuspend enabled. While bringing up
> a new board, I found some power regressions that I was able to narrow
> down to this change so I'm requesting a revert.
>
> I tested this on Hp Chromebook 14a (running 4.14 kernel and 5.4 kernel)
> with this revert:
> * Enabled autosuspend, used it normally with a HID device
> * Suspended the Chromebook and verified it worked normally on resume
> * Rebooted the Chromebook and verified Bluetooth was working on next
> boot
>
> I didn't see the issue that was originally reported with this fix. For
> the original reporter, if you're still seeing this issue, there are
> other ways to disable autosuspend for your device:
> * set module param: enable_autosuspend=0
> * change your kconfig so BT_HCIBTUSB_AUTOSUSPEND=n
> * use a udev rule to disable autosuspend for specific vid:pid
>
> Keeping this change in the kernel makes it impossible to enable
> autosuspend so it should be reverted.
>
> drivers/bluetooth/btusb.c | 4 ----
> 1 file changed, 4 deletions(-)
patch has been applied to bluetooth-next tree.
Regards
Marcel
prev parent reply other threads:[~2020-07-30 9:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-29 23:17 [PATCH] Revert "Bluetooth: btusb: Disable runtime suspend on Realtek devices" Abhishek Pandit-Subedi
2020-07-30 4:14 ` Kai-Heng Feng
2020-07-30 7:30 ` Marcel Holtmann
2020-07-30 9:50 ` Kai-Heng Feng
2020-07-30 9:55 ` Marcel Holtmann [this message]
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