linux-kernel - Re: [PATCH v10 4/9] drm/mediatek: generalize mtk_dither

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Message-ID: <1611808753.19104.2.camel@mtksdaap41>
Date:   Thu, 28 Jan 2021 12:39:13 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        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>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>
Subject: Re: [PATCH v10 4/9] drm/mediatek: generalize mtk_dither_set()
 function

Hi, Hsin-Yi:

On Wed, 2021-01-27 at 12:54 +0800, Hsin-Yi Wang wrote:
> There may be data structure other than mtk_ddp_comp_dev that would call
> mtk_dither_set(), so use regs as parameter instead of device.

You does not change the interface of mtk_dither_set(). You move the
common part in mtk_dither_set() to a new function which could be called
by another caller.

Regards,
CK.

> 
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_drv.h     |  4 ++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 25 +++++++++++++--------
>  2 files changed, 20 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index 46d199b7b4a29..c50d5fc9fd349 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -17,6 +17,10 @@ void mtk_color_config(struct device *dev, unsigned int w,
>  		      unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
>  void mtk_color_start(struct device *dev);
>  
> +void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
> +			   unsigned int bpc, unsigned int CFG,
> +			   struct cmdq_pkt *cmdq_pkt);
> +
>  void mtk_dpi_start(struct device *dev);
>  void mtk_dpi_stop(struct device *dev);
>  
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 7b5293429426d..53d25823a37cc 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -151,33 +151,40 @@ static void mtk_ddp_clk_disable(struct device *dev)
>  	clk_disable_unprepare(priv->clk);
>  }
>  
> -static void mtk_dither_set(struct device *dev, unsigned int bpc,
> -		    unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
> -{
> -	struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
>  
> +void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
> +			   unsigned int bpc, unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
> +{
>  	/* If bpc equal to 0, the dithering function didn't be enabled */
>  	if (bpc == 0)
>  		return;
>  
>  	if (bpc >= MTK_MIN_BPC) {
> -		mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_DITHER_5);
> -		mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_DITHER_7);
> +		mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_5);
> +		mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_7);
>  		mtk_ddp_write(cmdq_pkt,
>  			      DITHER_LSB_ERR_SHIFT_R(MTK_MAX_BPC - bpc) |
>  			      DITHER_ADD_LSHIFT_R(MTK_MAX_BPC - bpc) |
>  			      DITHER_NEW_BIT_MODE,
> -			      &priv->cmdq_reg, priv->regs, DISP_DITHER_15);
> +			      cmdq_reg, regs, DISP_DITHER_15);
>  		mtk_ddp_write(cmdq_pkt,
>  			      DITHER_LSB_ERR_SHIFT_B(MTK_MAX_BPC - bpc) |
>  			      DITHER_ADD_LSHIFT_B(MTK_MAX_BPC - bpc) |
>  			      DITHER_LSB_ERR_SHIFT_G(MTK_MAX_BPC - bpc) |
>  			      DITHER_ADD_LSHIFT_G(MTK_MAX_BPC - bpc),
> -			      &priv->cmdq_reg, priv->regs, DISP_DITHER_16);
> -		mtk_ddp_write(cmdq_pkt, DISP_DITHERING, &priv->cmdq_reg, priv->regs, CFG);
> +			      cmdq_reg, regs, DISP_DITHER_16);
> +		mtk_ddp_write(cmdq_pkt, DISP_DITHERING, cmdq_reg, regs, CFG);
>  	}
>  }
>  
> +static void mtk_dither_set(struct device *dev, unsigned int bpc,
> +		    unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
> +{
> +	struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> +
> +	mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc, CFG, cmdq_pkt);
> +}
> +
>  static void mtk_od_config(struct device *dev, unsigned int w,
>  			  unsigned int h, unsigned int vrefresh,
>  			  unsigned int bpc, struct cmdq_pkt *cmdq_pkt)