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

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Message-ID: <20220128112432.GA28@adf6a34bf206>
Date:   Fri, 28 Jan 2022 11:24:32 +0000
From:   Rudi Heitbaum <rudi@...tbaum.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Vyacheslav Bocharov <adeep@...ina.in>,
        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>
Subject: Re: [PATCH v7 0/2] Bluetooth: hci_h5: btrtl: Add support for
 RTL8822CS hci_ver 0x08

On Wed, Jan 26, 2022 at 02:40:38PM +0100, Marcel Holtmann wrote:
> 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.

Thanks Marcel and Vyacheslav

> Regards
> 
> Marcel
>