linux-kernel - Re: [PATCH v4, 1/1] drm/mediatek: add lut diff flag for new gamma hardware support

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Date:   Thu, 28 Apr 2022 15:19:44 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yongqiang Niu <yongqiang.niu@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Fabien Parent <fparent@...libre.com>,
        Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Yongqiang Niu <yongqiang.niu@...iatek.corp-partner.google.com>
Subject: Re: [PATCH v4, 1/1] drm/mediatek: add lut diff flag for new gamma
 hardware support

Il 28/04/22 10:58, Yongqiang Niu ha scritto:
> From: Yongqiang Niu <yongqiang.niu@...iatek.corp-partner.google.com>
> 
> mt8183 gamma module usage is different with before soc,
> gamma odd(index start from 0) lut value set to hardware
> register should be
> the difference of current lut value with last lut value.
> 
> for example, chrome os user space set lut
> like this(only r chanel for example):
> 2 4 6 8 10 12.
> 1) mt8183 gamma driver should set the gamma lut to hardware
> register like this:
> 2 [2] 6 [2] 10 [2]
> the value with [] is the difference value
> 2)gamma hardware process display data with original lut
> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>