linux-kernel - Re: [PATCH v3 0/8] Support for NVDEC on Tegra234

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Date:   Mon, 24 Oct 2022 15:15:52 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Mikko Perttunen <cyndis@...si.fi>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Ashish Mhetre <amhetre@...dia.com>,
        Sameer Pujar <spujar@...dia.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/8] Support for NVDEC on Tegra234

On Tue, Sep 20, 2022 at 11:11:55AM +0300, Mikko Perttunen wrote:
> From: Mikko Perttunen <mperttunen@...dia.com>
> 
> v3:
> * Updated patch 3 based on comments
> 
> v2:
> * Updated patches 1,3 based on comments
> * Added Acked-by to patch 2
> 
> Original message:
> 
> Hi all,
> 
> this series adds support for the HW video decoder, NVDEC,
> on Tegra234 (Orin). The main change is a switch from Falcon
> to RISC-V for the internal microcontroller, which brings along
> a change in how the engine is booted. Otherwise it is backwards
> compatible with earlier versions.
> 
> In previous iterations, firmware was simply loaded from disk and
> written into engine internal memory. Now, the engine has a
> bootrom that loads the firmware from a carveout where it has been
> loaded by the system bootloader; however, we still need to tell it
> where that carveout is loaded and some offsets into it. For that,
> the first patch adds a new memory controller API to query the
> carveout address. The offsets are read from device tree -- the
> expectation is that at flashing time (when the firmware is also
> flashed), the flasher also delivers a device tree overlay with
> values corresponding to the flashed firmware.
> 
> The currently available Linux for Tegra release doesn't yet
> include this device tree overlay flashing, and the firmware version
> it contains is incompatible with this series. The plan is to fix
> that for the next Linux for Tegra release, but if necessary, we
> can postpone merging of this series to once those changes are
> available.
> 
> Thanks!
> Mikko
> 
> Mikko Perttunen (8):
>   memory: tegra: Add API for retrieving carveout bounds
>   dt-bindings: Add headers for NVDEC on Tegra234
>   dt-bindings: Add bindings for Tegra234 NVDEC
>   arm64: tegra: Add NVDEC on Tegra234
>   gpu: host1x: Add stream ID register data for NVDEC on Tegra234
>   drm/tegra: nvdec: Support multiple clocks
>   drm/tegra: Add code for booting RISC-V based engines
>   drm/tegra: Add Tegra234 support to NVDEC driver
> 
>  .../gpu/host1x/nvidia,tegra234-nvdec.yaml     | 156 ++++++++++++++++
>  arch/arm64/boot/dts/nvidia/tegra234.dtsi      |  27 +++
>  drivers/gpu/drm/tegra/Makefile                |   3 +-
>  drivers/gpu/drm/tegra/drm.c                   |   1 +
>  drivers/gpu/drm/tegra/nvdec.c                 | 171 +++++++++++++++---
>  drivers/gpu/drm/tegra/riscv.c                 | 106 +++++++++++
>  drivers/gpu/drm/tegra/riscv.h                 |  30 +++
>  drivers/gpu/host1x/dev.c                      |  12 ++
>  drivers/memory/tegra/mc.c                     |  25 +++
>  drivers/memory/tegra/tegra234.c               |   5 +
>  include/dt-bindings/clock/tegra234-clock.h    |   4 +
>  include/dt-bindings/memory/tegra234-mc.h      |   3 +
>  .../dt-bindings/power/tegra234-powergate.h    |   1 +
>  include/dt-bindings/reset/tegra234-reset.h    |   1 +
>  include/soc/tegra/mc.h                        |  11 ++
>  15 files changed, 530 insertions(+), 26 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra234-nvdec.yaml
>  create mode 100644 drivers/gpu/drm/tegra/riscv.c
>  create mode 100644 drivers/gpu/drm/tegra/riscv.h

Applied, thanks.

Thierry

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