linux-kernel - Re: [PATCH v1] serial: qcom_geni: Fix BT failure regression on RB2 platform

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Message-ID: <CAO9ioeUsLwOs2RqGPcbeuOpHg4zuwwsstjJnTCH4-oRL=ss6kQ@mail.gmail.com>
Date: Wed, 7 Jan 2026 08:54:05 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Praveen Talari <praveen.talari@....qualcomm.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        bryan.odonoghue@...aro.org, andersson@...nel.org, psodagud@...cinc.com,
        djaggi@...cinc.com, quic_msavaliy@...cinc.com,
        quic_vtanuku@...cinc.com, quic_arandive@...cinc.com,
        quic_shazhuss@...cinc.com, quic_cchiluve@...cinc.com
Subject: Re: [PATCH v1] serial: qcom_geni: Fix BT failure regression on RB2 platform

On Wed, 7 Jan 2026 at 08:48, Praveen Talari
<praveen.talari@....qualcomm.com> wrote:
>
> A regression in linux-next causes Bluetooth functionality to fail during

linux-next is an ephemeral thing. Please reference the exact commit.

> bootup on the RB2 platform, preventing proper BT initialization. However,
> BT works correctly after bootup completes.
>
> The issue occurs when runtime PM is enabled and uart_add_one_port() is
> called before wakeup IRQ setup. The uart_add_one_port() call activates the
> device through runtime PM, which configures GPIOs to their default state.
> When wakeup IRQ registration happens afterward, it conflicts with these
> GPIO settings, causing state corruption that breaks Bluetooth
> functionality.

How does it "conflict with GPIO settings", what is "state corruption"?


>
> Fix this by moving runtime PM enablement and uart_add_one_port() after
> wakeup IRQ registration, ensuring proper initialization order.
>
> Reported-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> Closes:
> https://lore.kernel.org/all/20251110101043.2108414-4-praveen.talari@oss.qualcomm.com/
> Fixes: 10904d725f6e ("serial: qcom-geni: Enable PM runtime for serial driver")
> Signed-off-by: Praveen Talari <praveen.talari@....qualcomm.com>
> ---
>  drivers/tty/serial/qcom_geni_serial.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>

Tested-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry