[PATCH v5 13/17] drm/rockchip: analogix_dp: Apply &analogix_dp_plat_data.attach() to attach next bridge

[Damon Ding]

There may be the panel or bridge after &analogix_dp_device.bridge.
Add rockchip_dp_attach() to support the next bridge attachment for
the Rockchip side.

Signed-off-by: Damon Ding <damon.d...@rock-chips.com>
---
 .../gpu/drm/rockchip/analogix_dp-rockchip.c   | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c 
b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 0784f19a2ed9..39f1ed293c75 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -164,6 +164,24 @@ static int rockchip_dp_powerdown(struct 
analogix_dp_plat_data *plat_data)
        return 0;
 }
 
+static int rockchip_dp_attach(struct analogix_dp_plat_data *plat_data,
+                                    struct drm_bridge *bridge)
+{
+       struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data);
+       int ret;
+
+       if (plat_data->next_bridge) {
+               ret = drm_bridge_attach(&dp->encoder.encoder, 
plat_data->next_bridge, bridge,
+                                       DRM_BRIDGE_ATTACH_NO_CONNECTOR);
+               if (ret) {
+                       dev_err(dp->dev, "failed to attach following panel or 
bridge (%d)\n", ret);
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
 static bool
 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
                                   const struct drm_display_mode *mode,
@@ -452,6 +470,7 @@ static int rockchip_dp_probe(struct platform_device *pdev)
        dp->plat_data.dev_type = dp->data->chip_type;
        dp->plat_data.power_on = rockchip_dp_poweron;
        dp->plat_data.power_off = rockchip_dp_powerdown;
+       dp->plat_data.attach = rockchip_dp_attach;
        dp->plat_data.ops = &rockchip_dp_component_ops;
 
        ret = rockchip_dp_of_probe(dp);
-- 
2.34.1