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

[AngeloGioacchino Del Regno]

Il 28/04/22 10:58, Yongqiang Niu ha scritto:
> From: Yongqiang Niu <yongqiang.niu at mediatek.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 at mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>