linux-kernel - [PATCH v7 1/3] drm/debugfs: bridges

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Message-Id: <20250819-drm-bridge-debugfs-removed-v7-1-970702579978@bootlin.com>
Date: Tue, 19 Aug 2025 11:42:10 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.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>
Cc: Hui Pu <Hui.Pu@...ealthcare.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Dmitry Baryshkov <lumag@...nel.org>
Subject: [PATCH v7 1/3] drm/debugfs: bridges_show: show refcount

Now that bridges are refcounted, exposing the refcount in debugfs can be
useful.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

---

Changes in v7:
- rebased on current code:
  - code is in drm_bridge.c now
  - removed if (drm_bridge_is_refcounted(bridge)), refcounting is not
    optional

This patch was added in v6.
---
 drivers/gpu/drm/drm_bridge.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 0688f936eeb69d9f5655f2b00de4a0843dc76088..36e0829d25c29457cff5da5fec99646c74b6ad5a 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -1477,6 +1477,9 @@ static void drm_bridge_debugfs_show_bridge(struct drm_printer *p,
 					   unsigned int idx)
 {
 	drm_printf(p, "bridge[%u]: %ps\n", idx, bridge->funcs);
+
+	drm_printf(p, "\trefcount: %u\n", kref_read(&bridge->refcount));
+
 	drm_printf(p, "\ttype: [%d] %s\n",
 		   bridge->type,
 		   drm_get_connector_type_name(bridge->type));

-- 
2.50.1