linux-kernel - Re: [PATCH v10 02/13] drm/mediatek: add *driver

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Date:   Mon, 5 Dec 2016 20:50:41 +0800
From:   YT Shen <yt.shen@...iatek.com>
To:     Daniel Kurtz <djkurtz@...omium.org>
CC:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mao Huang <littlecvr@...omium.org>, CK Hu <ck.hu@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        "Jie Qiu" <jie.qiu@...iatek.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        shaoming chen <shaoming.chen@...iatek.com>,
        Jitao Shi <jitao.shi@...iatek.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Yingjoe Chen (陳英洲) 
        <yingjoe.chen@...iatek.com>,
        Emil Velikov <emil.l.velikov@...il.com>
Subject: Re: [PATCH v10 02/13] drm/mediatek: add *driver_data for different
 hardware settings

Hi Daniel,

On Wed, 2016-11-30 at 14:42 +0800, Daniel Kurtz wrote:
> Hi YT,
> 
> 
> On Fri, Nov 25, 2016 at 6:34 PM, YT Shen <yt.shen@...iatek.com> wrote:
> >
> > There are some hardware settings changed, between MT8173 & MT2701:
> > DISP_OVL address offset changed, color format definition changed.
> > DISP_RDMA fifo size changed.
> > DISP_COLOR offset changed.
> > MIPI_TX pll setting changed.
> > And add prefix for mtk_ddp_main & mtk_ddp_ext & mutex_mod.
> 
> Sorry, I have not had time to thoroughly review the new patch set, but
> one quick comment:
> 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > index 22a33ee..cfaa760 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> > @@ -78,6 +78,10 @@ struct mtk_ddp_comp_funcs {
> >                           struct drm_crtc_state *state);
> >  };
> >
> > +struct mtk_ddp_comp_driver_data {
> > +       unsigned int color_offset;
> > +};
> > +
> >  struct mtk_ddp_comp {
> >         struct clk *clk;
> >         void __iomem *regs;
> > @@ -85,6 +89,7 @@ struct mtk_ddp_comp {
> >         struct device *larb_dev;
> >         enum mtk_ddp_comp_id id;
> >         const struct mtk_ddp_comp_funcs *funcs;
> > +       const struct mtk_ddp_comp_driver_data *data;
> 
> I want to avoid adding this generic pointer here to all mtk_ddp_comp,
> since this is only used by the color component.
> Instead, define color specific types:
> 
> struct mtk_disp_color_data {
>        unsigned int offset;
> };
> 
> struct mtk_disp_color {
>        struct mtk_ddp_comp             ddp_comp;
>        const struct mtk_disp_color_data *data;
> };
> 
> Then, add another comp_type check and fetch the dev data in
> mtk_drm_probe()  or maybe mtk_ddp_comp_init().
> 
> -Dan
OK, we will remove the color data pointer from generic mtk_ddp_comp.
Thanks.

Regards,
yt.shen