linux-kernel - Re: [PATCH] drm/mediatek: mtk_dpi: Create connector for bridges

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Date:   Fri, 11 Dec 2020 22:04:38 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/mediatek: mtk_dpi: Create connector for bridges

Hi, Hsin-Yi:

Hsin-Yi Wang <hsinyi@...omium.org> 於 2020年12月3日 週四 下午4:24寫道：
>
> Similar to a9d9fea74be2 ("drm/mediatek: mtk_dsi: Create connector for bridges"):
>
> Use the drm_bridge_connector helper to create a connector for pipelines
> that use drm_bridge. This allows splitting connector operations across
> multiple bridges when necessary, instead of having the last bridge in
> the chain creating the connector and handling all connector operations
> internally.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>

>
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 52f11a63a330..189377e342fa 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -20,6 +20,7 @@
>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_of.h>
>  #include <drm/drm_simple_kms_helper.h>
> @@ -66,6 +67,7 @@ struct mtk_dpi {
>         struct drm_encoder encoder;
>         struct drm_bridge bridge;
>         struct drm_bridge *next_bridge;
> +       struct drm_connector *connector;
>         void __iomem *regs;
>         struct device *dev;
>         struct clk *engine_clk;
> @@ -603,12 +605,21 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
>
>         dpi->encoder.possible_crtcs = mtk_drm_find_possible_crtc_by_comp(drm_dev, dpi->ddp_comp);
>
> -       ret = drm_bridge_attach(&dpi->encoder, &dpi->bridge, NULL, 0);
> +       ret = drm_bridge_attach(&dpi->encoder, &dpi->bridge, NULL,
> +                               DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>         if (ret) {
>                 dev_err(dev, "Failed to attach bridge: %d\n", ret);
>                 goto err_cleanup;
>         }
>
> +       dpi->connector = drm_bridge_connector_init(drm_dev, &dpi->encoder);
> +       if (IS_ERR(dpi->connector)) {
> +               dev_err(dev, "Unable to create bridge connector\n");
> +               ret = PTR_ERR(dpi->connector);
> +               goto err_cleanup;
> +       }
> +       drm_connector_attach_encoder(dpi->connector, &dpi->encoder);
> +
>         dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
>         dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
>         dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
> --
> 2.29.2.576.ga3fc446d84-goog
>