linux-kernel - [PATCH v3 30/37] drm/bridge: Assume that a bridge is atomic if it has atomic

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Message-Id: <20250213-bridge-connector-v3-30-e71598f49c8f@kernel.org>
Date: Thu, 13 Feb 2025 15:43:49 +0100
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>, 
 Douglas Anderson <dianders@...omium.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Maxime Ripard <mripard@...nel.org>
Subject: [PATCH v3 30/37] drm/bridge: Assume that a bridge is atomic if it
 has atomic_reset

The drm_atomic_bridge_check() runs the atomic_check callback if needed,
or falls back to mode_fixup if it's not there.

Going forward, we'll need to setup the bridge atomic state even though
drivers might not be implementing atomic_check at all.

We can thus switch to using drm_bridge_is_atomic() to take the atomic
path, and do additional things there in the future, or go the mode_fixup
route.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/drm_bridge.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index d2525d0b1324cc3a63e32f5bf6ca6c4f9034eb4e..b6d24092674c8fa33d9b6ebab9ece0f91fb8f8ea 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -803,23 +803,25 @@ EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
 
 static int drm_atomic_bridge_check(struct drm_bridge *bridge,
 				   struct drm_crtc_state *crtc_state,
 				   struct drm_connector_state *conn_state)
 {
-	if (bridge->funcs->atomic_check) {
+	if (drm_bridge_is_atomic(bridge)) {
 		struct drm_bridge_state *bridge_state;
 		int ret;
 
 		bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
 							       bridge);
 		if (WARN_ON(!bridge_state))
 			return -EINVAL;
 
-		ret = bridge->funcs->atomic_check(bridge, bridge_state,
-						  crtc_state, conn_state);
-		if (ret)
-			return ret;
+		if (bridge->funcs->atomic_check) {
+			ret = bridge->funcs->atomic_check(bridge, bridge_state,
+							  crtc_state, conn_state);
+			if (ret)
+				return ret;
+		}
 	} else if (bridge->funcs->mode_fixup) {
 		if (!bridge->funcs->mode_fixup(bridge, &crtc_state->mode,
 					       &crtc_state->adjusted_mode))
 			return -EINVAL;
 	}

-- 
2.48.0