Hi Bala,
When is the estimated start date and timeline of the driver development?
Thanks,
Miao
On Fri, Apr 29, 2022 at 8:09 PM Balakrishna Godavarthi (QUIC)
<quic_bgodavar@xxxxxxxxxxx> wrote:
>
> Hi Marcel,
>
> -----Original Message-----
> From: Marcel Holtmann <marcel@xxxxxxxxxxxx>
> Sent: Friday, April 29, 2022 8:24 PM
> To: Balakrishna Godavarthi (QUIC) <quic_bgodavar@xxxxxxxxxxx>
> Cc: Andy Gross <agross@xxxxxxxxxx>; robh+dt@xxxxxxxxxx; bjorn.andersson@xxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Johan Hedberg <johan.hedberg@xxxxxxxxx>; mka@xxxxxxxxxxxx; linux-bluetooth@xxxxxxxxxxxxxxx; Hemant Gupta (QUIC) <quic_hemantg@xxxxxxxxxxx>; Sai Teja Aluvala (Temp) (QUIC) <quic_saluvala@xxxxxxxxxxx>; quic_rjliao <quic_rjliao@xxxxxxxxxxx>; mcchou@xxxxxxxxxxxx
> Subject: Re: [PATCH v1 3/3] Bluetooth: hci_qca: WAR to handle WCN6750 HW issue
>
> Hi Balakrishna,
>
> > The patch is workaround for hardware issue on WCN6750.
> > On WCN6750 sometimes observed AON power source takes 100ms time to
> > fully discharge voltage during OFF. As WCN6750 is combo chip for WLAN
> > and BT. If any of the tech area ON is triggered during discharge
> > phase, it fails to turn ON.
> > To overcome this hardware issue, During BT ON, driver check for
> > WLAN_EN pin status. If it high, it will pull BT_EN to high immediately
> > else it will wait for 100ms assuming WLAN was just powered OFF and
> > then BT_EN will be pulled to high.
> >
> > Fixes: d8f97da1b92d2 ("Bluetooth: hci_qca: Add support for QTI
> > Bluetooth chip wcn6750")
> > Reviewed-by: Miao-chen Chou <mcchou@xxxxxxxxxxxx>
> > Signed-off-by: Sai Teja Aluvala <quic_saluvala@xxxxxxxxxxx>
> > Signed-off-by: Balakrishna Godavarthi <quic_bgodavar@xxxxxxxxxxx>
> > ---
> > drivers/bluetooth/hci_qca.c | 30 ++++++++++++++++++++++++------
> > 1 file changed, 24 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> > index eab34e2..c3862d1 100644
> > --- a/drivers/bluetooth/hci_qca.c
> > +++ b/drivers/bluetooth/hci_qca.c
> > @@ -219,6 +219,7 @@ struct qca_serdev {
> > struct hci_uart serdev_hu;
> > struct gpio_desc *bt_en;
> > struct gpio_desc *sw_ctrl;
> > + struct gpio_desc *wlan_en;
> > struct clk *susclk;
> > enum qca_btsoc_type btsoc_type;
> > struct qca_power *bt_power;
>
> I am really against these intermixing of Bluetooth and WiFi details. There is work ongoing to do some sequence power procedure. Maybe that is something you should look into. This is a mess.
>
> And again, we are still hacking around hci_qca.c instead of writing a clean serdev only driver for this hardware. I have the feeling that nobody listens to review comments these days. It is just hacking patches together to get hardware enabled somehow and then disappear.
>
> [Bala]: We are working on serdev like driver for our QCA platform. We are in initial stages of discussion, and soon we will start the driver development work.
> In mean to stop stability or functional issues we are trying to add these HACKs in QCA driver.
>
> Regards
>
> Marcel
>
