Message-ID: <CAAOTY_9jsunT=PH59yrJ=q_uPM83WVH1m4c379APCUOGL3ZjdQ@mail.gmail.com>
Date:   Sat, 25 Jul 2020 11:50:50 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Yongqiang Niu <yongqiang.niu@...iatek.com>
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>,
        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: [v7, PATCH 6/7] drm/mediatek: add fifo_size into rdma private data

The primary thing of this patch is to get fifo size from device tree.
So you may modify title to show the primary thing.

Yongqiang Niu <yongqiang.niu@...iatek.com> 於 2020年7月23日 週四 上午10:12寫道：
>
> the fifo size of rdma in mt8183 is different.
> rdma0 fifo size is 5k
> rdma1 fifo size is 2k

I would like the description to be "Get the fifo size from device tree
because each rdma in the same SoC may have different fifo size."

Regards,
Chun-Kuang.

>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> index e04319f..794acc5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> @@ -63,6 +63,7 @@ struct mtk_disp_rdma {
>         struct mtk_ddp_comp             ddp_comp;
>         struct drm_crtc                 *crtc;
>         const struct mtk_disp_rdma_data *data;
> +       u32                             fifo_size;
>  };
>
>  static inline struct mtk_disp_rdma *comp_to_rdma(struct mtk_ddp_comp *comp)
> @@ -131,12 +132,18 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
>         unsigned int threshold;
>         unsigned int reg;
>         struct mtk_disp_rdma *rdma = comp_to_rdma(comp);
> +       u32 rdma_fifo_size;
>
>         mtk_ddp_write_mask(cmdq_pkt, width, comp,
>                            DISP_REG_RDMA_SIZE_CON_0, 0xfff);
>         mtk_ddp_write_mask(cmdq_pkt, height, comp,
>                            DISP_REG_RDMA_SIZE_CON_1, 0xfffff);
>
> +       if (rdma->fifo_size)
> +               rdma_fifo_size = rdma->fifo_size;
> +       else
> +               rdma_fifo_size = RDMA_FIFO_SIZE(rdma);
> +
>         /*
>          * Enable FIFO underflow since DSI and DPI can't be blocked.
>          * Keep the FIFO pseudo size reset default of 8 KiB. Set the
> @@ -145,7 +152,7 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
>          */
>         threshold = width * height * vrefresh * 4 * 7 / 1000000;
>         reg = RDMA_FIFO_UNDERFLOW_EN |
> -             RDMA_FIFO_PSEUDO_SIZE(RDMA_FIFO_SIZE(rdma)) |
> +             RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) |
>               RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
>         mtk_ddp_write(cmdq_pkt, reg, comp, DISP_REG_RDMA_FIFO_CON);
>  }
> @@ -291,6 +298,16 @@ static int mtk_disp_rdma_probe(struct platform_device *pdev)
>                 return comp_id;
>         }
>
> +       if (of_find_property(dev->of_node, "mediatek,rdma_fifo_size", &ret)) {
> +               ret = of_property_read_u32(dev->of_node,
> +                                          "mediatek,rdma_fifo_size",
> +                                          &priv->fifo_size);
> +               if (ret) {
> +                       dev_err(dev, "Failed to get rdma fifo size\n");
> +                       return ret;
> +               }
> +       }
> +
>         ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id,
>                                 &mtk_disp_rdma_funcs);
>         if (ret) {
> --
> 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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