linux-kernel - Re: [PATCH v10 07/16] drm/mediatek: aal: Use bitfield macros

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Message-ID: <663daba1611ba84c96dcbf33ed93f151d5e3f160.camel@mediatek.com>
Date:   Thu, 12 Oct 2023 04:05:07 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "wenst@...omium.org" <wenst@...omium.org>,
        "kernel@...labora.com" <kernel@...labora.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "ehristev@...labora.com" <ehristev@...labora.com>
Subject: Re: [PATCH v10 07/16] drm/mediatek: aal: Use bitfield macros

Hi, Angelo:

On Fri, 2023-08-04 at 09:28 +0200, AngeloGioacchino Del Regno wrote:
> Make the code more robust and improve readability by using bitfield
> macros instead of open coding bit operations.

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_aal.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> index e2e4155faf01..bec035780db0 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> @@ -18,6 +18,8 @@
>  #define DISP_AAL_EN				0x0000
>  #define AAL_EN						BIT(0)
>  #define DISP_AAL_SIZE				0x0030
> +#define DISP_AAL_SIZE_HSIZE				GENMASK(28, 16)
> +#define DISP_AAL_SIZE_VSIZE				GENMASK(12, 0)
>  #define DISP_AAL_OUTPUT_SIZE			0x04d8
>  #define DISP_AAL_LUT_SIZE			512
>  
> @@ -56,9 +58,13 @@ void mtk_aal_config(struct device *dev, unsigned
> int w,
>  			   unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
>  {
>  	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> +	u32 sz;
>  
> -	mtk_ddp_write(cmdq_pkt, w << 16 | h, &aal->cmdq_reg, aal->regs, 
> DISP_AAL_SIZE);
> -	mtk_ddp_write(cmdq_pkt, w << 16 | h, &aal->cmdq_reg, aal->regs, 
> DISP_AAL_OUTPUT_SIZE);
> +	sz = FIELD_PREP(DISP_AAL_SIZE_HSIZE, w);
> +	sz |= FIELD_PREP(DISP_AAL_SIZE_VSIZE, h);
> +
> +	mtk_ddp_write(cmdq_pkt, sz, &aal->cmdq_reg, aal->regs,
> DISP_AAL_SIZE);
> +	mtk_ddp_write(cmdq_pkt, sz, &aal->cmdq_reg, aal->regs,
> DISP_AAL_OUTPUT_SIZE);
>  }
>  
>  /**