linux-kernel - Re: [PATCH v1 0/3] WAR to handle WCN6750 hardware issue

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Date:   Wed, 22 Jun 2022 10:33:48 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Balakrishna Godavarthi <quic_bgodavar@...cinc.com>,
        agross@...nel.org, robh+dt@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, marcel@...tmann.org,
        johan.hedberg@...il.com
Cc:     mka@...omium.org, linux-bluetooth@...r.kernel.org,
        quic_hemantg@...cinc.com, quic_saluvala@...cinc.com,
        quic_rjliao@...cinc.com, mcchou@...omium.org
Subject: Re: [PATCH v1 0/3] WAR to handle WCN6750 hardware issue

On 29/04/2022 13:27, Balakrishna Godavarthi wrote:
> 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.

Ugh. This adds another point to support separate power sequencer device 
for WiFi+BT devices. Let me refresh my last patchset, so that we can 
implement it as a part of common code, rather than hacking hci_qca on 
and on.

> 
> Balakrishna Godavarthi (3):
>    dt-bindings: net: bluetooth: Add wlan-gpio entry for wcn6750
>    arm64: dts: qcom: sc7280: Add wlan enable gpio to bluetooth node
>    Bluetooth: hci_qca: WAR to handle WCN6750 HW issue
> 
>   .../bindings/net/qualcomm-bluetooth.yaml           |  6 +++++
>   arch/arm64/boot/dts/qcom/sc7280-idp.dtsi           |  1 +
>   drivers/bluetooth/hci_qca.c                        | 30 +++++++++++++++++-----
>   3 files changed, 31 insertions(+), 6 deletions(-)
> 


-- 
With best wishes
Dmitry