linux-kernel - Re: [PATCH v4 0/7] Add support to the mmsys driver to be a reset controller

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Date:   Fri, 8 Oct 2021 15:16:43 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-kernel@...r.kernel.org
Cc:     linux-mediatek@...ts.infradead.org, eizan@...omium.org,
        kernel@...labora.com, drinkcat@...omium.org,
        jitao.shi@...iatek.com, chunkuang.hu@...nel.org,
        hsinyi@...omium.org, Crystal Guo <crystal.guo@...iatek.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Fabien Parent <fparent@...libre.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v4 0/7] Add support to the mmsys driver to be a reset
 controller



On 30/09/2021 10:31, Enric Balletbo i Serra wrote:
> Dear all,
> 
> The following patchset is a reimplementation of the patch sent by Jitao
> Shi [1] some time ago. As suggested by Chun-Kuang Hu, this time the
> reset is done using the reset API, where the mmsys driver is the reset
> controller and the mtk_dsi driver is the reset consumer.
> 
> Note that the first patch is kind of unrelated change, it's just a
> cleanup but is needed if you want to apply all the following patches
> cleanly.
> 
> This patchset is important in order to have the DSI panel working on some
> kukui MT8183 Chromebooks (i.e Lenovo IdeaPad Duet). Without it, you just
> get a black screen.
> 

Patch 1-5 pushed to v5.15-next/dts64
Patch 6-7 pushed to v5.15-next/soc

Thanks!
Matthias

> Best regards,
>    Enric
> 
> [1] https://lore.kernel.org/linux-arm-kernel/20210420132614.150242-4-jitao.shi@mediatek.com/
> 
> 
> Changes in v4:
> - Remove unnused variable as pointed by Hsin-Yi
> 
> Changes in v3:
> - Based on top of the patch that converts mmsys to schema
> - Fix typo in the commit description
> 
> Changes in v2:
> - Fix build test ERROR Reported-by: kernel test robot <lkp@...el.com>
> - Added a new patch to describe the dsi reset optional property.
> 
> Enric Balletbo i Serra (7):
>    arm64: dts: mediatek: Move reset controller constants into common
>      location
>    dt-bindings: mediatek: Add #reset-cells to mmsys system controller
>    dt-bindings: display: mediatek: add dsi reset optional property
>    arm64: dts: mt8173: Add the mmsys reset bit to reset the dsi0
>    arm64: dts: mt8183: Add the mmsys reset bit to reset the dsi0
>    soc: mediatek: mmsys: Add reset controller support
>    drm/mediatek: mtk_dsi: Reset the dsi0 hardware
> 
>   .../bindings/arm/mediatek/mediatek,mmsys.yaml |  4 ++
>   .../display/mediatek/mediatek,dsi.txt         |  6 ++
>   arch/arm64/boot/dts/mediatek/mt8173.dtsi      |  2 +
>   arch/arm64/boot/dts/mediatek/mt8183.dtsi      |  5 +-
>   drivers/gpu/drm/mediatek/mtk_dsi.c            |  5 +-
>   drivers/soc/mediatek/mtk-mmsys.c              | 68 +++++++++++++++++++
>   drivers/soc/mediatek/mtk-mmsys.h              |  2 +
>   drivers/watchdog/mtk_wdt.c                    |  6 +-
>   .../mt2712-resets.h                           |  0
>   include/dt-bindings/reset/mt8173-resets.h     |  2 +
>   .../mt8183-resets.h                           |  3 +
>   .../mt8192-resets.h                           |  0
>   12 files changed, 97 insertions(+), 6 deletions(-)
>   rename include/dt-bindings/{reset-controller => reset}/mt2712-resets.h (100%)
>   rename include/dt-bindings/{reset-controller => reset}/mt8183-resets.h (98%)
>   rename include/dt-bindings/{reset-controller => reset}/mt8192-resets.h (100%)
>