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Message-ID: <1553744279.14682.10.camel@mtksdaap41>
Subject: Re: [PATCH v2 05/25] drm/mediatek: split DISP_REG_CONFIG_DSI_SEL
 setting into another use case
From:   CK Hu <ck.hu@mediatek.com>
To:     <yongqiang.niu@mediatek.com>
CC:     <p.zabel@pengutronix.de>, <robh+dt@kernel.org>,
        <matthias.bgg@gmail.com>, <airlied@linux.ie>,
        <mark.rutland@arm.com>, <dri-devel@lists.freedesktop.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>, <Bibby.Hsieh@mediatek.com>,
        <yt.shen@mediatek.com>
Date:   Thu, 28 Mar 2019 11:37:59 +0800
In-Reply-To: <1553667561-25447-6-git-send-email-yongqiang.niu@mediatek.com>
References: <1553667561-25447-1-git-send-email-yongqiang.niu@mediatek.com>
         <1553667561-25447-6-git-send-email-yongqiang.niu@mediatek.com>
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Hi, Yongqiang:

On Wed, 2019-03-27 at 14:19 +0800, yongqiang.niu@mediatek.com wrote:
> From: Yongqiang Niu <yongqiang.niu@mediatek.com>
> 
> Here is two modifition in this patch:
> 1.bls->dpi0 and rdma1->dsi are differen usecase,
> Split DISP_REG_CONFIG_DSI_SEL setting into anther usecase
> 2.remove DISP_REG_CONFIG_DPI_SEL setting, DPI_SEL_IN_BLS is 0 and
> this is same with hardware defautl setting,
> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> index 495ebc5..80dc91f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -401,10 +401,9 @@ static void mtk_ddp_sout_sel(void __iomem *config_regs,
>  	} else if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DPI0) {
>  		writel_relaxed(BLS_TO_DPI_RDMA1_TO_DSI,
>  			       config_regs + DISP_REG_CONFIG_OUT_SEL);
> +	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DSI0) {
>  		writel_relaxed(DSI_SEL_IN_RDMA,
>  			       config_regs + DISP_REG_CONFIG_DSI_SEL);
> -		writel_relaxed(DPI_SEL_IN_BLS,
> -			       config_regs + DISP_REG_CONFIG_DPI_SEL);

The original code is implemented by Bibby and I think MT2701 has some
hardware limitation so the code works like this. Please make sure that
your patch would make other SoC works.

Regards,
CK

>  	}
>  }
>