Hi, Enric:
Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> 於 2020年4月17日 週五 下午11:06寫道：
>
> 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.
>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> ---
>
> Changes in v3:
> - Move the bridge.type line to the patch that adds drm_bridge support. (Laurent Pinchart)
>
> Changes in v2: None
>
> drivers/gpu/drm/mediatek/mtk_dsi.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 157097c63b23..85f76b01ae4d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -17,6 +17,7 @@
>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
> #include <drm/drm_mipi_dsi.h>
> #include <drm/drm_of.h>
> #include <drm/drm_panel.h>
> @@ -183,6 +184,7 @@ struct mtk_dsi {
> struct drm_encoder encoder;
> struct drm_bridge bridge;
> struct drm_bridge *next_bridge;
> + struct drm_connector *connector;
> struct phy *phy;
>
> void __iomem *regs;
> @@ -977,10 +979,19 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
> */
> dsi->encoder.possible_crtcs = 1;
>
> - ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
> + ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL,
> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> if (ret)
> goto err_cleanup_encoder;
>
> + dsi->connector = drm_bridge_connector_init(drm, &dsi->encoder);
> + if (IS_ERR(dsi->connector)) {
> + DRM_ERROR("Unable to create bridge connector\n");
> + ret = PTR_ERR(dsi->connector);
> + goto err_cleanup_encoder;
> + }
> + drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
> +
I'm not very clear about how brige-connector works, but why connector
does not attach to panel?
Regards,
Chun-Kuang.
> return 0;
>
> err_cleanup_encoder:
> --
> 2.25.1
>
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