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SubjectRe: [PATCH v1 0/3] WAR to handle WCN6750 hardware issue
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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

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