linux-kernel - [PATCH 06/29] drm/bridge: Implement atomic_print

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Message-Id: <20250902-drm-state-readout-v1-6-14ad5315da3f@kernel.org>
Date: Tue, 02 Sep 2025 10:32:34 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, 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>, 
 Jyri Sarha <jyri.sarha@....fi>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Devarsh Thakkar <devarsht@...com>, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 06/29] drm/bridge: Implement atomic_print_state

Bridges have some fields in their state worth printing, but we don't
provide an atomic_print_state implementation to show those fields.

Let's do so.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/drm_bridge.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index dd439d55177a867acb7ab73c02182bada44d93c9..e803dfd8fd5aae9c16931445213df04d8715b9f6 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -370,13 +370,31 @@ drm_bridge_atomic_destroy_priv_state(struct drm_private_obj *obj,
 	struct drm_bridge *bridge = drm_priv_to_bridge(obj);
 
 	bridge->funcs->atomic_destroy_state(bridge, state);
 }
 
+static void
+drm_bridge_atomic_print_priv_state(struct drm_printer *p,
+				   const struct drm_private_state *s)
+{
+	const struct drm_bridge_state *state =
+		container_of_const(s, struct drm_bridge_state, base);
+	struct drm_bridge *bridge = drm_priv_to_bridge(s->obj);
+
+	drm_printf(p, "bridge: %s", drm_get_connector_type_name(bridge->type));
+	drm_printf(p, "\tinput bus configuration:");
+	drm_printf(p, "\t\tcode: %04x", state->input_bus_cfg.format);
+	drm_printf(p, "\t\tflags: %08x", state->input_bus_cfg.flags);
+	drm_printf(p, "\toutput bus configuration:");
+	drm_printf(p, "\t\tcode: %04x", state->output_bus_cfg.format);
+	drm_printf(p, "\t\tflags: %08x", state->output_bus_cfg.flags);
+}
+
 static const struct drm_private_state_funcs drm_bridge_priv_state_funcs = {
 	.atomic_duplicate_state = drm_bridge_atomic_duplicate_priv_state,
 	.atomic_destroy_state = drm_bridge_atomic_destroy_priv_state,
+	.atomic_print_state = drm_bridge_atomic_print_priv_state,
 };
 
 static bool drm_bridge_is_atomic(struct drm_bridge *bridge)
 {
 	return bridge->funcs->atomic_reset != NULL;

-- 
2.50.1