linux-kernel - Re: [PATCH v2, 12/17] drm/mediatek: fix gamma size config

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Message-ID: <CAAOTY_9=QuVvyrFiUP=8-EMNPmgTK9TZr_ZmuJ=SbHZEjNnxyw@mail.gmail.com>
Date:   Wed, 23 Dec 2020 23:48:17 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Yongqiang Niu <yongqiang.niu@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        CK Hu <ck.hu@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2, 12/17] drm/mediatek: fix gamma size config

Hi, Yongqiang:

Yongqiang Niu <yongqiang.niu@...iatek.com> 於 2020年12月23日 週三 上午9:37寫道：
>
> On Tue, 2020-12-15 at 07:40 +0800, Chun-Kuang Hu wrote:
> > Hi, Yongqiang:
> >
> > Yongqiang Niu <yongqiang.niu@...iatek.com> 於 2020年12月12日 週六 下午12:13寫道：
> > >
> > > fix gamma size config
> >
> > I would like you to provide more information. The original code works
> > in mt8173, why do you modify this? The description may be something
> > like this:
> >
> > According to data sheet, the width is in bits [31, 16] and height is
> > in bits [15, 0]. Even though wrong setting may works in some SoC such
> > as mt8173, but it does not work in mt8192.
> >
> > Regards,
> > Chun-Kuang.
>
> it still works in mt8192.
> just modify this follow data sheet

This patch is not strongly related to MT8192, so move this patch out
of this series.

Regards,
Chun-Kuang.

>
> >
> > >
> > > Fixes: e0a5d3370245 (drm/mediatek: Add GAMMA engine basic function)
> > > Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> > > ---
> > >  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > > index 00d5687..52b6fc7 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > > @@ -297,7 +297,7 @@ static void mtk_gamma_config(struct mtk_ddp_comp *comp, unsigned int w,
> > >                              unsigned int h, unsigned int vrefresh,
> > >                              unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> > >  {
> > > -       mtk_ddp_write(cmdq_pkt, h << 16 | w, comp, DISP_GAMMA_SIZE);
> > > +       mtk_ddp_write(cmdq_pkt, w << 16 | h, comp, DISP_GAMMA_SIZE);
> > >         mtk_dither_set(comp, bpc, DISP_GAMMA_CFG, cmdq_pkt);
> > >  }
> > >
> > > --
> > > 1.8.1.1.dirty
> > > _______________________________________________
> > > Linux-mediatek mailing list
> > > Linux-mediatek@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-mediatek
>

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