linux-kernel - Re: [PATCH RESEND v3 5/9] drm/mediatek: Add gamma support different lut

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Date:   Wed, 14 Sep 2022 09:17:51 +0800
From:   Jason-JH Lin <jason-jh.lin@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH RESEND v3 5/9] drm/mediatek: Add gamma support different
 lut_bits for other SoC

Hi CK,

Thanks for the reviews.

On Mon, 2022-09-12 at 11:40 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Mon, 2022-09-12 at 09:30 +0800, Jason-JH.Lin wrote:
> > Add lut_bits in gamma driver data for each SoC and adjust the usage
> > of lut_bits in mtk_drm_gamma_set_common().
> > 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 36 ++++++++++++++++---
> > --
> > --
> >  1 file changed, 25 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > index 0a1022032b71..be82d15a5204 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > @@ -25,11 +25,14 @@
> >  
> >  #define LUT_10BIT_MASK				0x03ff
> >  #define LUT_SIZE_DEFAULT			512 /* for setting
> > gamma lut from AAL */
> > +#define LUT_BITS_DEFAULT			10
> > +#define LUT_INPUT_BITS				16 /* input lut
> > bit from application */
> 
> I think we should use drm_color_lut_extract() to let the input bits
> transparent. So add one patch to use drm_color_lut_extract(), and
> then
> apply this patch.
> 
> Regards,
> CK

OK, I'll separate it to 2 patches, 1 is using drm_color_lut_extract()
to handle with input lut data and the other is adding gamma support
lut_bits and shift_bits.

Regards,
Jason-JH.Lin