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

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Message-ID: <1651228073-1999-1-git-send-email-quic_bgodavar@quicinc.com>
Date:   Fri, 29 Apr 2022 15:57:50 +0530
From:   Balakrishna Godavarthi <quic_bgodavar@...cinc.com>
To:     <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>,
        Balakrishna Godavarthi <quic_bgodavar@...cinc.com>
Subject: [PATCH v1 0/3] WAR to handle WCN6750 hardware issue

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.

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(-)

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