linux-kernel - Re: [PATCH 2/2] Bluetooth: hci_qca: wcn3990: Drop baudrate change vendor event

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Date:   Tue, 9 Apr 2019 09:36:35 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     c-hbandi@...eaurora.org, Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hemantg <hemantg@...eaurora.org>
Subject: Re: [PATCH 2/2] Bluetooth: hci_qca: wcn3990: Drop baudrate change
 vendor event

On Thu, Apr 04, 2019 at 08:22:15PM +0530, Balakrishna Godavarthi wrote:
> Hi Matthias,
> 
> On 2019-04-03 21:44, Matthias Kaehlcke wrote:
> > On Wed, Apr 03, 2019 at 11:53:26AM +0530, Balakrishna Godavarthi wrote:
> > > + Harish to update his findings on wcn3998.
> > > Mean time i will perform a regression to detect the failure.
> > 
> > On my system it typically reproduces within a few dozen
> > iterations. Make sure your tree doesn't contain any custom BT patches,
> > even if they just add logging or fix the timeout during
> > initialization. Since this problem is timing sensitive it might get
> > masked. My tree is based on 4.19 LTS with all QCA BT related changes
> > on top:
> > https://chromium.googlesource.com/chromiumos/third_party/kernel/+/refs/heads/chromeos-4.19
> > 
> > I found some problems during initialization easier to reproduce
> > when binding and unbinding the device through sysfs, instead of
> > doing hciconfig up/down, this resembles more the initialization at
> > boot time.
> > 
> [Bala]: I am able to replicate this issue.
>         are you seeing the below error message getting logged on the console
> in the issue case or an different error message.
>         Bluetooth: hci0: QCA TLV response size mismatch

Yes, that's the error message. The size doesn't match because the
driver expects a TLV response but gets a baud rate response.