linux-kernel - Re: [PATCH] Bluetooth: btusb: Make the CSR clone chip force-suspend workaround more generic

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Message-Id: <D11408EE-8541-4930-A438-6338F342EFB1@holtmann.org>
Date:   Thu, 29 Jul 2021 21:55:45 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Ismael Ferreras Morezuelas <swyterzone@...il.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        BlueZ <linux-bluetooth@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH] Bluetooth: btusb: Make the CSR clone chip force-suspend
 workaround more generic

Hi Ismael,

> Turns out Hans de Goede completed the work I started last year trying to
> improve Chinese-clone detection of CSR controller chips. Quirk after quirk
> these Bluetooth dongles are more usable now.
> 
> Even after a few BlueZ regressions; these clones are so fickle that some
> days they stop working altogether. Except on Windows, they work fine.
> 
> 
> But this force-suspend initialization quirk seems to mostly do the trick,
> after a lot of testing Bluetooth now seems to work *all* the time.
> 
> The only problem is that the solution ended up being masked under a very
> stringent check; when there are probably hundreds of fake dongle
> models out there that benefit from a good reset. Make it so.
> 
> 
> Fixes: 81cac64ba258a ("Bluetooth: Deal with USB devices that are faking CSR vendor")
> Fixes: cde1a8a992875 ("Bluetooth: btusb: Fix and detect most of the Chinese Bluetooth controllers")
> Fixes: d74e0ae7e0303 ("Bluetooth: btusb: Fix detection of some fake CSR controllers with a bcdDevice val of 0x0134")
> Fixes: 0671c0662383e ("Bluetooth: btusb: Add workaround for remote-wakeup issues with Barrot 8041a02 fake CSR controllers")
> 
> Cc: stable@...r.kernel.org
> Cc: Hans de Goede <hdegoede@...hat.com>
> Tested-by: Ismael Ferreras Morezuelas <swyterzone@...il.com>
> Signed-off-by: Ismael Ferreras Morezuelas <swyterzone@...il.com>
> ---
> 
> I've changed the warning line to make it easy to grep and detect if this updated
> workaround is part of the driver. Should make it much more obvious to users in
> case their dongle doesn't work for other reasons. There's a clear then-now.
> 
> Easy to narrow other future issues down. Let me know what you think.
> 
> drivers/bluetooth/btusb.c | 61 +++++++++++++++++++++------------------
> 1 file changed, 33 insertions(+), 28 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel