[PATCH 0/5] Add support for ECS LIVA QC710 mini PC/devkit

[Val Packett <val@packett.cool>]

This piece of Arm history was an early Windows dev kit before Volterra..
(Though it holds the brand of its manufacturer Elitegroup, not Microsoft's).
It's also a cheap device that can be used wherever you need a mini PC.
Now with Linux ^_^

Most things work, including Wi-Fi, Bluetooth, USB, eMMC, microSD, GPU.

The device tree is mostly based on Aspire1, with most things deleted :)
and the "fun" USB/DP setup added (the QMPPHY is permanently in 2+2 mode,
2 lanes are routed to a USB-A SuperSpeed port, and the other 2 to a
DP-to-HDMI bridge, which is permanently enabled).

The HDMI display does work.. though I'm seeing flickering artifacts in the
top part of the screen. I was told it also happens with DP on other sc7180
devices. A "disp_cc_mdss_dp_pixel_clk_src: rcg didn't update its configuration."
is logged once on boot, but seems to be a red herring, just due to trying
too early (the clock actually updates fine later, changes on mode switch etc.)
But then, I see this fault spammed constantly when display is working:
arm-smmu 15000000.iommu: Unhandled context fault: fsr=0x402, iova=0x9bc00000, fsynr=0x10021, cbfrsynra=0x800, cb=8
Suspiciously, 0x9bc00000 is the PA for the framebuffer provided by EFI!
Though the issue doesn't go away if efifb is completely disabled in Linux.

As for HDMI audio, it does work on Windows so there must be some way to get it
working, I've tried configuring DP audio and I'm seeing the *exact* same errors
as https://lore.kernel.org/linux-arm-msm/DD8RLVPWQQ7O.1B3E1P6VNMWV1@fairphone.com/
(DSP returned error[9], AFE enable for port 0x6020 failed -22) but that fix
of course has long been applied so it's a different issue with the same symptom
(I checked with prints, it's *not* DP not being ready).

~val

Val Packett (5):
  dt-bindings: arm: qcom: Add ECS LIVA QC710
  dt-bindings: display: bridge: simple: document the Algoltek AG6311
    DP-to-HDMI bridge
  drm/bridge: simple: add the Algoltek AG6311 DP-to-HDMI bridge
  arm64: dts: qcom: Add support for ECS LIVA QC710
  firmware: qcom: scm: Allow QSEECOM on ECS LIVA QC710

 .../devicetree/bindings/arm/qcom.yaml         |   1 +
 .../display/bridge/simple-bridge.yaml         |   1 +
 arch/arm64/boot/dts/qcom/Makefile             |   2 +
 .../boot/dts/qcom/sc7180-ecs-liva-qc710.dts   | 625 ++++++++++++++++++
 drivers/firmware/qcom/qcom_scm.c              |   1 +
 drivers/gpu/drm/bridge/simple-bridge.c        |   5 +
 6 files changed, 635 insertions(+)
 create mode 100644 arch/arm64/boot/dts/qcom/sc7180-ecs-liva-qc710.dts

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2.51.2