From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Praveen Talari <praveen.talari@oss.qualcomm.com>
Cc: Jiri Slaby <jirislaby@kernel.org>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-serial@vger.kernel.org, bryan.odonoghue@linaro.org,
dmitry.baryshkov@oss.qualcomm.com, andersson@kernel.org,
psodagud@quicinc.com, djaggi@quicinc.com,
quic_msavaliy@quicinc.com, quic_vtanuku@quicinc.com,
quic_arandive@quicinc.com, quic_shazhuss@quicinc.com,
quic_cchiluve@quicinc.com
Subject: Re: [PATCH v1] serial: qcom_geni: Fix BT failure regression on RB2 platform
Date: Wed, 7 Jan 2026 08:25:00 +0100 [thread overview]
Message-ID: <2026010746-maker-oink-39fb@gregkh> (raw)
In-Reply-To: <20260107064834.1006428-1-praveen.talari@oss.qualcomm.com>
On Wed, Jan 07, 2026 at 12:18:34PM +0530, Praveen Talari wrote:
> A regression in linux-next causes Bluetooth functionality to fail during
> 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.
>
> 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@oss.qualcomm.com>
> Closes:
> https://lore.kernel.org/all/20251110101043.2108414-4-praveen.talari@oss.qualcomm.com/
No line wrapping for tags please.
thanks,
greg k-h
next prev parent reply other threads:[~2026-01-07 7:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-07 6:48 [PATCH v1] serial: qcom_geni: Fix BT failure regression on RB2 platform Praveen Talari
2026-01-07 6:54 ` Dmitry Baryshkov
2026-01-07 7:06 ` Praveen Talari
2026-01-07 7:22 ` Dmitry Baryshkov
2026-01-07 9:24 ` Praveen Talari
2026-01-07 10:46 ` Konrad Dybcio
2026-01-07 10:58 ` Praveen Talari
2026-01-07 11:35 ` Dmitry Baryshkov
2026-01-07 14:08 ` Praveen Talari
2026-01-07 16:13 ` Dmitry Baryshkov
2026-01-07 7:25 ` Greg Kroah-Hartman [this message]
2026-01-07 7:25 ` Greg Kroah-Hartman
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