linux-kernel - [PATCH 0/3] soc: qcom: Add download mode support for QTI platforms

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Message-Id: <cover.1628757036.git.saiprakash.ranjan@codeaurora.org>
Date:   Thu, 12 Aug 2021 14:47:39 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Subject: [PATCH 0/3] soc: qcom: Add download mode support for QTI platforms

Collecting ramdumps on QTI platforms mainly require two things,
SDI (System Debug Image) enabled firmware and kernel support to
configure download mode cookies and SDI settings. Ramdumps can
be collected once the system enters the download mode. To enter
download mode, magic values or cookies need to be set in IMEM
which is used by firmware to decide to enter download mode or not.
Download mode cookies remain the same across targets and SDI disable
register needs to be set or SDI needs to be disabled in case of normal
reboot since ramdumps are supposed to be for crash debugging and
not for every reboot. This series adds the kernel support required
to enter download mode.

Currently this series doesn't add support for android targets where
a couple of SCM calls are required to set/unset the download mode
cookies and SDI configuration but can be easily added gradually to
the same driver, so as of now only chrome platforms are supported
and tested.

Sai Prakash Ranjan (3):
  soc: qcom: Add download mode support
  dt-bindings: msm: Add QTI download mode support binding
  arm64: dts: qcom: sc7180: Add IMEM, pil info and download mode region

 .../bindings/arm/msm/qcom,dload-mode.yaml     |  53 ++++++
 MAINTAINERS                                   |   7 +
 arch/arm64/boot/dts/qcom/sc7180.dtsi          |  21 +++
 drivers/soc/qcom/Kconfig                      |  10 ++
 drivers/soc/qcom/Makefile                     |   1 +
 drivers/soc/qcom/download_mode.c              | 152 ++++++++++++++++++
 6 files changed, 244 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,dload-mode.yaml
 create mode 100644 drivers/soc/qcom/download_mode.c

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