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From: Marcel Holtmann <>
To: Hui Wang <>
Cc: Bluetooth Kernel Mailing List <>,
Subject: Re: [PATCH] Bluetooth: btusb: Some Qualcomm Bluetooth adapters stop working
Date: Mon, 8 Feb 2021 14:53:07 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hi Hui,

> This issue starts from linux-5.10-rc1, I reproduced this issue on my
> Dell Inspiron 7447 with BT adapter 0cf3:e005, the kernel will print
> out: "Bluetooth: hci0: don't support firmware rome 0x31010000", and
> someone else also reported the similar issue to bugzilla #211571.
> I found this is a regression introduced by 'commit b40f58b97386
> ("Bluetooth: btusb: Add Qualcomm Bluetooth SoC WCN6855 support"), the
> patch assumed that if high ROM version is not zero, it is an adapter
> on WCN6855, but many old adapters don't need to load rampatch or nvm,
> and they have non-zero high ROM version.
> To fix it, let the driver match the rom_version in the
> qca_devices_table first, if there is no entry matched, check the
> high ROM version, if it is not zero, we assume this adapter is ready
> to work and no need to load rampatch and nvm like previously.
> BugLink:
> Fixes: b40f58b97386 ("Bluetooth: btusb: Add Qualcomm Bluetooth SoC WCN6855 support")
> Signed-off-by: Hui Wang <>
> ---
> drivers/bluetooth/btusb.c | 7 +++++++
> 1 file changed, 7 insertions(+)

patch has been applied to bluetooth-next tree.



      parent reply	other threads:[~2021-02-08 13:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-08  5:02 [PATCH] Bluetooth: btusb: Some Qualcomm Bluetooth adapters stop working Hui Wang
2021-02-08  6:10 `
2021-02-08 13:53 ` Marcel Holtmann [this message]

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