linux-kernel - Re: [PATCH v7 0/2] Bluetooth: hci_h5: btrtl: Add support for RTL8822CS hci

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Message-Id: <9CE136E5-3BEC-42CB-8A19-644E2B4D0D10@holtmann.org>
Date:   Wed, 26 Jan 2022 14:40:38 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Vyacheslav Bocharov <adeep@...ina.in>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        BlueZ <linux-bluetooth@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Rudi Heitbaum <rudi@...tbaum.com>
Subject: Re: [PATCH v7 0/2] Bluetooth: hci_h5: btrtl: Add support for
 RTL8822CS hci_ver 0x08

Hi Vyacheslav,

> Add a variation of RTL8822CS with hci_ver = 0x08. This is fully similar
> to RTL8822CS with hci_ver = 0x0a observed on the Tanix TX6 Android set-top
> box and JetHome JetHub H1.
> 
> While testing the RTL8822CS SDIO WiFi/BT adapter, I found that in some
> cases the kernel could not initialize it. However, manually resetting the
> adapter via gpio allows it to start correctly.
> Apparently at system start the adapter is in an undefined state (including
> the unknown state of gpio after starting uboot). A forced reset helps to
> initialize the adapter in most cases. Experimentally it was found that
> 100ms is enough to reset.
> So, add power reset via enable-gpios in h5_btrtl_open function.
> 
> Changes from v6..v4:
> - fix patch description
> Changes from v3:
> - add has_msft_ext option
> Changes from v2:
> - align the patches for bluetooth-next
> Changes from v1:
> - remove Signed-off-by chbgdn <chbgdn@...il.com> as not reachable
> 
> Vyacheslav Bocharov (2):
>  Bluetooth: btrtl: Add support for RTL8822C hci_ver 0x08
>  Bluetooth: hci_h5: Add power reset via gpio in h5_btrtl_open
> 
> drivers/bluetooth/btrtl.c  | 8 ++++++++
> drivers/bluetooth/hci_h5.c | 5 +++++
> 2 files changed, 13 insertions(+)

both patches have been applied to bluetooth-next tree.

Regards

Marcel