linux-kernel - [PATCH] drm: xlnx: zynqmp_dpsub: also call drm_helper_hpd_irq

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Message-ID: <20240923074803.10306-1-lists@steffen.cc>
Date: Mon, 23 Sep 2024 09:48:03 +0200
From: lists@...ffen.cc
To: dri-devel@...ts.freedesktop.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Steffen Dirkwinkel <lists@...ffen.cc>,
	Steffen Dirkwinkel <s.dirkwinkel@...khoff.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Michal Simek <michal.simek@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm: xlnx: zynqmp_dpsub: also call drm_helper_hpd_irq_event

From: Steffen Dirkwinkel <s.dirkwinkel@...khoff.com>

With hpd going through the bridge as of commit eb2d64bfcc17
("drm: xlnx: zynqmp_dpsub: Report HPD through the bridge")
we don't get hotplug events in userspace on zynqmp hardware.
Also sending hotplug events with drm_helper_hpd_irq_event works.

Fixes: eb2d64bfcc17 ("drm: xlnx: zynqmp_dpsub: Report HPD through the bridge")
Signed-off-by: Steffen Dirkwinkel <s.dirkwinkel@...khoff.com>
---
 drivers/gpu/drm/xlnx/zynqmp_dp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 1846c4971fd8..cb823540a412 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -17,6 +17,7 @@
 #include <drm/drm_fourcc.h>
 #include <drm/drm_modes.h>
 #include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
 
 #include <linux/clk.h>
 #include <linux/delay.h>
@@ -1614,6 +1615,9 @@ static void zynqmp_dp_hpd_work_func(struct work_struct *work)
 					    hpd_work.work);
 	enum drm_connector_status status;
 
+	if (dp->bridge.dev)
+		drm_helper_hpd_irq_event(dp->bridge.dev);
+
 	status = zynqmp_dp_bridge_detect(&dp->bridge);
 	drm_bridge_hpd_notify(&dp->bridge, status);
 }
-- 
2.46.1