linux-kernel - Re: [PATCH v3 4/9] drm/mediatek: Add gamma support different lut

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Date:   Wed, 14 Sep 2022 09:33:50 +0800
From:   Jason-JH Lin <jason-jh.lin@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.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>
CC:     CK Hu <ck.hu@...iatek.com>, 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 v3 4/9] drm/mediatek: Add gamma support different
 lut_size for other SoC

On Mon, 2022-09-12 at 12:24 +0200, AngeloGioacchino Del Regno wrote:
> Il 11/09/22 17:37, Jason-JH.Lin ha scritto:
> > 1. Add mtk_drm_gamma_get_lut_size() and remove MTK_LUT_SIZE macro.
> > 2. Add lut_size to gamma driver data for different SoC.
> > 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > ---
> >   drivers/gpu/drm/mediatek/mtk_disp_drv.h     |  1 +
> >   drivers/gpu/drm/mediatek/mtk_disp_gamma.c   | 22
> > +++++++++++++++++++--
> >   drivers/gpu/drm/mediatek/mtk_drm_crtc.c     |  4 ++--
> >   drivers/gpu/drm/mediatek/mtk_drm_crtc.h     |  1 -
> >   drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  9 +++++++++
> >   5 files changed, 32 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > index a83e5fbc8724..6a05bb56e693 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > @@ -51,6 +51,7 @@ void mtk_gamma_clk_disable(struct device *dev);
> >   void mtk_gamma_config(struct device *dev, unsigned int w,
> >   		      unsigned int h, unsigned int vrefresh,
> >   		      unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> > +unsigned int mtk_gamma_get_lut_size(struct device *dev);
> >   void mtk_gamma_set(struct device *dev, struct drm_crtc_state
> > *state);
> >   void mtk_gamma_set_common(struct device *dev, void __iomem *regs,
> > struct drm_crtc_state *state);
> >   void mtk_gamma_start(struct device *dev);
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > index f54a6a618348..e69d0b205b9a 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > @@ -24,10 +24,12 @@
> >   #define DISP_GAMMA_LUT				0x0700
> >   
> >   #define LUT_10BIT_MASK				0x03ff
> > +#define LUT_SIZE_DEFAULT			512 /* for setting
> > gamma lut from AAL */
> >   
> >   struct mtk_disp_gamma_data {
> >   	bool has_dither;
> >   	bool lut_diff;
> > +	u16 lut_size;
> >   };
> >   
> >   /*
> > @@ -54,18 +56,32 @@ void mtk_gamma_clk_disable(struct device *dev)
> >   	clk_disable_unprepare(gamma->clk);
> >   }
> >   
> > +unsigned int mtk_gamma_get_size(struct device *dev)
> > +{
> > +	struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
> > +	unsigned int lut_size = LUT_SIZE_DEFAULT;
> > +
> > +	if (gamma && gamma->data)
> > +		lut_size = gamma->data->lut_size;
> > +
> > +	return lut_size;
> > +}
> > +
> >   void mtk_gamma_set_common(struct device *dev, void __iomem *regs,
> > struct drm_crtc_state *state)
> >   {
> >   	struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
> >   	bool lut_diff = false;
> > +	u16 lut_size = LUT_SIZE_DEFAULT;
> 
> This makes us get a double assignment in case gamma->data is
> populated.
> 
> >   	unsigned int i, reg;
> >   	struct drm_color_lut *lut;
> >   	void __iomem *lut_base;
> >   	u32 word;
> >   	u32 diff[3] = {0};
> >   
> > -	if (gamma && gamma->data)
> > +	if (gamma && gamma->data) {
> >   		lut_diff = gamma->data->lut_diff;
> > +		lut_size = gamma->data->lut_size;
> > +	}
> 
> ...you can avoid it like that:
> 
> } else {
> 	lut_size = LUT_SIZE_DEFAULT;
> }
> 
> 
> Regards,
> Angelo
> 
> 
-- 
Jason-JH Lin <jason-jh.lin@...iatek.com>