linux-kernel - [PATCH v1 0/4] Enable Serial on SA8255p Qualcomm platforms

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Message-Id: <20251110101043.2108414-1-praveen.talari@oss.qualcomm.com>
Date: Mon, 10 Nov 2025 15:40:39 +0530
From: Praveen Talari <praveen.talari@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-serial@...r.kernel.org, alexey.klimov@...aro.org,
        krzk@...nel.org, bryan.odonoghue@...aro.org,
        jorge.ramirez@....qualcomm.com, dmitry.baryshkov@....qualcomm.com
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>, 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,
        Praveen Talari <praveen.talari@....qualcomm.com>
Subject: [PATCH v1 0/4] Enable Serial on SA8255p Qualcomm platforms

PM runtime support was previously added to the serial driver but had to
be reverted due to wakeup IRQ storms and deadlock issues observed on the
RB1 platform.

Reference:
https://lore.kernel.org/all/DC0D53ZTNOBU.E8LSD5E5Z8TX@linaro.org/

This patch series reintroduces PM runtime support for UART on SA8255p
with fixes to resolve those issues.

The Qualcomm automotive SA8255p SoC relies on firmware to configure
platform resources, including clocks, interconnects and TLMM.
The driver requests resources operations over SCMI using power
and performance protocols.

The SCMI power protocol enables or disables resources like clocks,
interconnect paths, and TLMM (GPIOs) using runtime PM framework APIs,
such as resume/suspend, to control power states(on/off).

The SCMI performance protocol manages UART baud rates, with each baud
rate represented by a performance level. The driver uses the
dev_pm_opp_set_level() API to request the desired baud rate by
specifying the performance level.

Praveen Talari (4):
  arm64: dts: qcom: qrb2210-rb1: Fix UART3 wakeup IRQ storm
  pinctrl: qcom: msm: Fix potential deadlock in pinmux configuration
  serial: qcom-geni: Enable PM runtime for serial driver
  serial: qcom-geni: Enable Serial on SA8255p Qualcomm platforms

 arch/arm64/boot/dts/qcom/qrb2210-rb1.dts |   2 +-
 drivers/pinctrl/qcom/pinctrl-msm.c       |   2 +-
 drivers/tty/serial/qcom_geni_serial.c    | 178 ++++++++++++++++++++---
 3 files changed, 163 insertions(+), 19 deletions(-)

base-commit: ab40c92c74c6b0c611c89516794502b3a3173966
-- 
2.34.1