drm/bridge: analogix_dp: Add support to get panel from the DP AUX bus

The main modification is moving the DP AUX initialization from function
analogix_dp_bind() to analogix_dp_probe(). In order to get the EDID of
eDP panel during probing, it is also needed to advance PM operations to
ensure that eDP controller and phy are prepared for AUX transmission.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250310104114.2608063-7-damon.ding@rock-chips.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 8fdd0365693404251904ba0bec7b3c63d856869e..84ad34f712440b0a46480c088b90e2777effe960 100644 (file)
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1646,6 +1646,17 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
                goto err_disable_clk;
        }
 
+       dp->aux.name = "DP-AUX";
+       dp->aux.transfer = analogix_dpaux_transfer;
+       dp->aux.dev = dp->dev;
+       drm_dp_aux_init(&dp->aux);
+
+       pm_runtime_use_autosuspend(dp->dev);
+       pm_runtime_set_autosuspend_delay(dp->dev, 100);
+       ret = devm_pm_runtime_enable(dp->dev);
+       if (ret)
+               goto err_disable_clk;
+
        return dp;
 
 err_disable_clk:
@@ -1696,15 +1707,6 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
        dp->drm_dev = drm_dev;
        dp->encoder = dp->plat_data->encoder;
 
-       pm_runtime_use_autosuspend(dp->dev);
-       pm_runtime_set_autosuspend_delay(dp->dev, 100);
-       ret = devm_pm_runtime_enable(dp->dev);
-       if (ret)
-               return ret;
-
-       dp->aux.name = "DP-AUX";
-       dp->aux.transfer = analogix_dpaux_transfer;
-       dp->aux.dev = dp->dev;
        dp->aux.drm_dev = drm_dev;
 
        ret = drm_dp_aux_register(&dp->aux);