linux-kernel - Re: [PATCH v2] drm/mediatek: add ctm property support

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Date:   Thu, 5 Dec 2019 16:08:43 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <yongqiang.niu@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2] drm/mediatek: add ctm property support

Hi, Yongqiang:

On Mon, 2019-12-02 at 17:03 +0800, yongqiang.niu@...iatek.com wrote:
> From: Yongqiang Niu <yongqiang.niu@...iatek.com>
> 
> add ctm property support
> 
> Change-Id: I8111da7b309b1809c6302e7748dd9fd06dc97bde
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c     | 15 ++++++-
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 61 ++++++++++++++++++++++++++++-
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 11 ++++++
>  3 files changed, 84 insertions(+), 3 deletions(-)
> 

[snip]


> @@ -870,6 +875,12 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>  		}
>  
>  		mtk_crtc->ddp_comp[i] = comp;
> +
> +		if (comp_id == DDP_COMPONENT_CCORR)
> +			has_ctm = true;
> +
> +		if (comp_id == DDP_COMPONENT_GAMMA)

Not only DDP_COMPONENT_GAMMA has gamma function, but also
DDP_COMPONENT_AAL0 and DDP_COMPONENT_AAL1. I think it's no good to use
comp_id to decide what function of this component has. The easy way is
just to check weather the function point exist.

Regards,
CK

> +			gamma_lut_size = MTK_LUT_SIZE;
>  	}
>  
>  	for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> @@ -891,7 +902,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>  	if (ret < 0)
>  		return ret;
>  	drm_mode_crtc_set_gamma_size(&mtk_crtc->base, MTK_LUT_SIZE);
> -	drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, false, MTK_LUT_SIZE);
> +	drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, has_ctm, gamma_lut_size);
>  	priv->num_pipes++;
>  #ifdef CONFIG_MTK_CMDQ
>  	mtk_crtc->cmdq_client =