lkml.org 
[lkml]   [2019]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH AUTOSEL 5.4 133/350] Bluetooth: hci_bcm: Fix RTS handling during startup
On Mon, Dec 16, 2019 at 02:15:12PM +0100, Ondřej Jirman wrote:
> Hi,
>
> On Tue, Dec 10, 2019 at 04:03:58PM -0500, Sasha Levin wrote:
> > From: Stefan Wahren <wahrenst@gmx.net>
> >
> > [ Upstream commit 3347a80965b38f096b1d6f995c00c9c9e53d4b8b ]
> >
> > The RPi 4 uses the hardware handshake lines for CYW43455, but the chip
> > doesn't react to HCI requests during DT probe. The reason is the inproper
> > handling of the RTS line during startup. According to the startup
> > signaling sequence in the CYW43455 datasheet, the hosts RTS line must
> > be driven after BT_REG_ON and BT_HOST_WAKE.
> >
> > Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
> > Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
> > Signed-off-by: Sasha Levin <sashal@kernel.org>
> > ---
> > drivers/bluetooth/hci_bcm.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
> > index 7646636f2d183..0f73f6a686cb7 100644
> > --- a/drivers/bluetooth/hci_bcm.c
> > +++ b/drivers/bluetooth/hci_bcm.c
> > @@ -445,9 +445,11 @@ static int bcm_open(struct hci_uart *hu)
> >
> > out:
> > if (bcm->dev) {
> > + hci_uart_set_flow_control(hu, true);
> > hu->init_speed = bcm->dev->init_speed;
> > hu->oper_speed = bcm->dev->oper_speed;
> > err = bcm_gpio_set_power(bcm->dev, true);
> > + hci_uart_set_flow_control(hu, false);
> > if (err)
> > goto err_unset_hu;
> > }
>
> This causes bluetooth breakage (degraded bluetooth performance, due to failure to
> switch to higher baudrate) for Orange Pi 3 board:
>
> [ 3.839134] Bluetooth: hci0: command 0xfc18 tx timeout
> [ 11.999136] Bluetooth: hci0: BCM: failed to write update baudrate (-110)
> [ 12.004613] Bluetooth: hci0: Failed to set baudrate
> [ 12.123187] Bluetooth: hci0: BCM: chip id 130
> [ 12.128398] Bluetooth: hci0: BCM: features 0x0f
> [ 12.154686] Bluetooth: hci0: BCM4345C5
> [ 12.157165] Bluetooth: hci0: BCM4345C5 (003.006.006) build 0000
> [ 15.343684] Bluetooth: hci0: BCM4345C5 (003.006.006) build 0038
>
> I suggest not pushing this to stable.

Is it being fixed in Linus's tree?

thanks,

greg k-h

\
 
 \ /
  Last update: 2019-12-16 14:28    [W:0.212 / U:0.416 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site