Re: [PATCH v6 08/14] drm/rockchip: analogix_dp: Add support to get panel from the DP AUX bus

["Heiko Stübner" <heiko@sntech.de>]

Hi Damon,

Am Donnerstag, 23. Januar 2025, 11:07:41 MEZ schrieb Damon Ding:
> Move drm_of_find_panel_or_bridge() a little later and combine it with
> component_add() into a new function rockchip_dp_link_panel(). The function
> will serve as done_probing() callback of devm_of_dp_aux_populate_bus(),
> aiding to support for obtaining the eDP panel via the DP AUX bus.
> 
> If failed to get the panel from the DP AUX bus, it will then try the other
> way to get panel information through the platform bus.
> 
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
> 
> ---

> @@ -450,9 +461,17 @@ static int rockchip_dp_probe(struct platform_device *pdev)
>  	if (IS_ERR(dp->adp))
>  		return PTR_ERR(dp->adp);
>  
> -	ret = component_add(dev, &rockchip_dp_component_ops);
> -	if (ret)
> -		return ret;
> +	ret = devm_of_dp_aux_populate_bus(analogix_dp_get_aux(dp->adp), rockchip_dp_link_panel);

This causes an undefined-reference error, so you probably need something like:

diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
index f9cbbb40b36f..fa946a809858 100644
--- a/drivers/gpu/drm/rockchip/Kconfig
+++ b/drivers/gpu/drm/rockchip/Kconfig
@@ -8,6 +8,7 @@ config DRM_ROCKCHIP
        select DRM_PANEL
        select VIDEOMODE_HELPERS
        select DRM_ANALOGIX_DP if ROCKCHIP_ANALOGIX_DP
+       select DRM_DISPLAY_DP_AUX_BUS if ROCKCHIP_ANALOGIX_DP
        select DRM_DW_HDMI if ROCKCHIP_DW_HDMI
        select DRM_DW_HDMI_QP if ROCKCHIP_DW_HDMI_QP
        select DRM_DW_MIPI_DSI if ROCKCHIP_DW_MIPI_DSI