linux-kernel - Re: [PATCH v8, 1/6] dt-bindings: mediatek: add rdma_fifo_size description for mt8183 display

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Date:   Fri, 11 Dec 2020 08:43:36 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC:     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 v8, 1/6] dt-bindings: mediatek: add rdma_fifo_size
 description for mt8183 display

On Thu, 2020-12-10 at 23:40 +0800, Chun-Kuang Hu wrote:
> Hi, Yongqiang:
> 
> Yongqiang Niu <yongqiang.niu@...iatek.com> 於 2020年12月10日 週四 下午5:22寫道：
> >
> > rdma fifo size may be different even in same SOC, add this
> > property to the corresponding rdma
> >
> > Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> > ---
> >  .../bindings/display/mediatek/mediatek,disp.txt          | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt b/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt
> > index 1212207..64c64ee 100644
> > --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt
> > +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt
> > @@ -66,6 +66,13 @@ Required properties (DMA function blocks):
> >    argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
> >    for details.
> >
> > +Optional properties (RDMA function blocks):
> > +- mediatek,rdma_fifo_size: rdma fifo size may be different even in same SOC, add this
> > +  property to the corresponding rdma
> > +  the value is the Max value which defined in hardware data sheet.
> > +  rdma_fifo_size of rdma0 in mt8183 is 5120
> > +  rdma_fifo_size of rdma1 in mt8183 is 2048
> > +
> >  Examples:
> >
> >  mmsys: clock-controller@...00000 {
> > @@ -207,3 +214,12 @@ od@...23000 {
> >         power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
> >         clocks = <&mmsys CLK_MM_DISP_OD>;
> >  };
> > +
> > +rdma1: rdma@...0c000 {
> > +       compatible = "mediatek,mt8183-disp-rdma";
> > +       reg = <0 0x1400c000 0 0x1000>;
> > +       interrupts = <GIC_SPI 229 IRQ_TYPE_LEVEL_LOW>;
> > +       power-domains = <&scpsys MT8183_POWER_DOMAIN_DISP>;
> > +       clocks = <&mmsys CLK_MM_DISP_RDMA1>;
> > +       mediatek,rdma_fifo_size = <2048>;
> > +};
> 
> In [1], Rob has suggest that not add example of rdma1, it's better to
> add mediatek,rdma_fifo_size in rdma0 for example.
> 
> [1] https://patchwork.kernel.org/project/linux-mediatek/patch/1596855231-5782-2-git-send-email-yongqiang.niu@mediatek.com/
> 
> Regards,
> Chun-Kuang.

the description of rdma0 is mt8173, and mt8173 rdma driver set the
correspond fifo size already ok like this:
static const struct mtk_disp_rdma_data mt8173_rdma_driver_data = {
	.fifo_size = SZ_8K,
}; 

please double confirm shall we add this information into rdma0
description.

> 
> > --
> > 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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