On Fri, Sep 12, 2025 at 04:58:42PM +0800, Damon Ding wrote:
> 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);
Can this be handled inside analogix_dp_bridge's attach callback?
> + 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
>
--
With best wishes
Dmitry
