linux-kernel - [PATCH 1/7] drm/bridge: analogix_dp: drop extra calls to analogix_dp_prepare

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Message-Id: <20250401-panel-return-void-v1-1-93e1be33dc8d@oss.qualcomm.com>
Date: Tue, 01 Apr 2025 08:11:33 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] drm/bridge: analogix_dp: drop extra calls to
 analogix_dp_prepare_panel()

The analogix_dp_prepare_panel() returns immediately if there is no
attached panel. Drop several calls to this function which are performed
when dp->plat_data->panel is NULL.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 042154e2d8ccd74ac2dc27fe527e810a50e08a09..ab1cfc340aa95bbf13fe021bd33227b565a5458d 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1005,17 +1005,11 @@ static int analogix_dp_get_modes(struct drm_connector *connector)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
 	const struct drm_edid *drm_edid;
-	int ret, num_modes = 0;
+	int num_modes = 0;
 
 	if (dp->plat_data->panel) {
 		num_modes += drm_panel_get_modes(dp->plat_data->panel, connector);
 	} else {
-		ret = analogix_dp_prepare_panel(dp, true, false);
-		if (ret) {
-			DRM_ERROR("Failed to prepare panel (%d)\n", ret);
-			return 0;
-		}
-
 		drm_edid = drm_edid_read_ddc(connector, &dp->aux.ddc);
 
 		drm_edid_connector_update(&dp->connector, drm_edid);
@@ -1024,10 +1018,6 @@ static int analogix_dp_get_modes(struct drm_connector *connector)
 			num_modes += drm_edid_connector_add_modes(&dp->connector);
 			drm_edid_free(drm_edid);
 		}
-
-		ret = analogix_dp_prepare_panel(dp, false, false);
-		if (ret)
-			DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
 	}
 
 	if (dp->plat_data->get_modes)
@@ -1087,19 +1077,9 @@ analogix_dp_detect(struct drm_connector *connector, bool force)
 	if (dp->plat_data->panel)
 		return connector_status_connected;
 
-	ret = analogix_dp_prepare_panel(dp, true, false);
-	if (ret) {
-		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
-		return connector_status_disconnected;
-	}
-
 	if (!analogix_dp_detect_hpd(dp))
 		status = connector_status_connected;
 
-	ret = analogix_dp_prepare_panel(dp, false, false);
-	if (ret)
-		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
-
 	return status;
 }
 

-- 
2.39.5