From 7e40e2a70c5781e20057c3f16adea48710aacc1a Mon Sep 17 00:00:00 2001
From: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Date: Sat, 25 Dec 2021 09:31:51 +0300
Subject: drm/bridge_connector: enable HPD by default if supported
Git-commit: 09077bc3116581f4d1cb961ec359ad56586e370b
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Hotplug events reported by bridge drivers over drm_bridge_hpd_notify()
get ignored unless somebody calls drm_bridge_hpd_enable(). When the
connector for the bridge is bridge_connector, such a call is done from
drm_bridge_connector_enable_hpd().
However drm_bridge_connector_enable_hpd() is never called on init paths,
documentation suggests that it is intended for suspend/resume paths.
In result, once encoders are switched to bridge_connector,
bridge-detected HPD stops working.
This patch adds a call to that API on init path.
This fixes HDMI HPD with rcar-du + adv7513 case when adv7513 reports HPD
events via interrupts.
Fixes: c24110a8fd09 ("drm: rcar-du: Use drm_bridge_connector_init() helper")
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211225063151.2110878-1-nikita.yoush@cogentembedded.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/drm_bridge_connector.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
index 60923cdfe8e1..6b3dad03d77d 100644
--- a/drivers/gpu/drm/drm_bridge_connector.c
+++ b/drivers/gpu/drm/drm_bridge_connector.c
@@ -384,8 +384,10 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
connector_type, ddc);
drm_connector_helper_add(connector, &drm_bridge_connector_helper_funcs);
- if (bridge_connector->bridge_hpd)
+ if (bridge_connector->bridge_hpd) {
connector->polled = DRM_CONNECTOR_POLL_HPD;
+ drm_bridge_connector_enable_hpd(connector);
+ }
else if (bridge_connector->bridge_detect)
connector->polled = DRM_CONNECTOR_POLL_CONNECT
| DRM_CONNECTOR_POLL_DISCONNECT;
--
2.38.1