linux-kernel - Re: [PATCH] Bluetooth: btusb: Disable runtime suspend on Realtek devices

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Date:   Thu, 5 Dec 2019 10:32:19 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Alex Lu <alex_lu@...lsil.com.cn>, pkshih@...ltek.com,
        linux-bluetooth@...r.kernel.or, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: btusb: Disable runtime suspend on Realtek
 devices

Hi Kai-Heng,

> After commit 9e45524a0111 ("Bluetooth: btusb: Fix suspend issue for
> Realtek devices") both WiFi and Bluetooth stop working after reboot:
> [   34.322617] usb 1-8: reset full-speed USB device number 3 using xhci_hcd
> [   34.450401] usb 1-8: device descriptor read/64, error -71
> [   34.694375] usb 1-8: device descriptor read/64, error -71
> ...
> [   44.599111] rtw_pci 0000:02:00.0: failed to poll offset=0x5 mask=0x3 value=0x0
> [   44.599113] rtw_pci 0000:02:00.0: mac power on failed
> [   44.599114] rtw_pci 0000:02:00.0: failed to power on mac
> [   44.599114] rtw_pci 0000:02:00.0: leave idle state failed
> [   44.599492] rtw_pci 0000:02:00.0: failed to leave ips state
> [   44.599493] rtw_pci 0000:02:00.0: failed to leave idle state
> 
> That commit removed USB_QUIRK_RESET_RESUME, which not only resets the USB
> device after resume, it also prevents the device from being runtime
> suspended by USB core. My experiment shows if the Realtek btusb device
> ever runtime suspends once, the entire wireless module becomes useless
> after reboot.
> 
> So let's explicitly disable runtime suspend on Realtek btusb device for
> now.
> 
> Fixes: 9e45524a0111 ("Bluetooth: btusb: Fix suspend issue for Realtek devices")
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
> drivers/bluetooth/btusb.c | 4 ++++
> 1 file changed, 4 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel