linux-kernel - [PATCH] drm/probe_helper: Don't bother probing when connectors are forced off

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Date:   Mon, 17 Sep 2018 13:43:44 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/probe_helper: Don't bother probing when connectors are forced off

Userspace asked them to be forced off, so why would we care about what a
probe tells us?

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/drm_probe_helper.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index a1bb157bfdfa..56d2b5dd1f58 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -269,7 +269,9 @@ drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
 retry:
 	ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx);
 	if (!ret) {
-		if (funcs->detect_ctx)
+		if (connector->force == DRM_FORCE_OFF)
+			ret = connector_status_disconnected;
+		else if (funcs->detect_ctx)
 			ret = funcs->detect_ctx(connector, &ctx, force);
 		else if (connector->funcs->detect)
 			ret = connector->funcs->detect(connector, force);
@@ -317,6 +319,9 @@ drm_helper_probe_detect(struct drm_connector *connector,
 	if (ret)
 		return ret;
 
+	if (connector->force == DRM_FORCE_OFF)
+		return connector_status_disconnected;
+
 	if (funcs->detect_ctx)
 		return funcs->detect_ctx(connector, ctx, force);
 	else if (connector->funcs->detect)
-- 
2.17.1