linux-kernel - Re: [PATCH v5 6/7] drm/mediatek: support CMDQ interface in ddp component

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Date:   Fri, 20 Dec 2019 21:27:39 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-mediatek@...ts.infradead.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        srv_heupstream@...iatek.com,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Tomasz Figa <tfiga@...omium.org>, CK Hu <ck.hu@...iatek.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 6/7] drm/mediatek: support CMDQ interface in ddp component

On Tue, Dec 10, 2019 at 5:05 AM Bibby Hsieh <bibby.hsieh@...iatek.com> wrote:

>
> +void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value,
> +                  struct mtk_ddp_comp *comp, unsigned int offset)
> +{
> +#if IS_ENABLED(CONFIG_MTK_CMDQ)
Should we use #ifdef like in v4? https://patchwork.kernel.org/patch/11274439/

We got warnings while compiling kernels if CONFIG_MTK_CMDQ is not set,
since cmdq_pkt_write() would still be compiled.
Similar in other #if IS_ENABLED(CONFIG_MTK_CMDQ) (also in 7/7
https://patchwork.kernel.org/patch/11281349/)


> +       if (cmdq_pkt)
> +               cmdq_pkt_write(cmdq_pkt, comp->subsys,
> +                              comp->regs_pa + offset, value);
> +       else
> +#endif
> +               writel(value, comp->regs + offset);
> +}
> +