linux-kernel - [PATCH 3/5] drm/nouveau: Add missing RPM get/put() when probing connectors

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Message-Id: <20180716235936.11268-4-lyude@redhat.com>
Date:   Mon, 16 Jul 2018 19:59:27 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     nouveau@...ts.freedesktop.org
Cc:     Karol Herbst <karolherbst@...il.com>, stable@...r.kernel.org,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] drm/nouveau: Add missing RPM get/put() when probing connectors

While the GPU is guaranteed to be on when a hotplug has been received,
the same assertion does not hold true if a connector probe has been
started by userspace without having had received a sysfs event. So
ensure that any connector probing keeps the GPU alive for the duration
of the probe.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Cc: Karol Herbst <karolherbst@...il.com>
Cc: stable@...r.kernel.org
---
 drivers/gpu/drm/nouveau/dispnv50/disp.c     |  2 +-
 drivers/gpu/drm/nouveau/nouveau_connector.c | 21 +++++++++++++++++++--
 drivers/gpu/drm/nouveau/nouveau_connector.h |  3 +++
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index ea2a886854fe..0f283ca75189 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -858,7 +858,7 @@ static const struct drm_connector_funcs
 nv50_mstc = {
 	.reset = nouveau_conn_reset,
 	.detect = nv50_mstc_detect,
-	.fill_modes = drm_helper_probe_single_connector_modes,
+	.fill_modes = nouveau_connector_probe_single_connector_modes,
 	.destroy = nv50_mstc_destroy,
 	.atomic_duplicate_state = nouveau_conn_atomic_duplicate_state,
 	.atomic_destroy_state = nouveau_conn_atomic_destroy_state,
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 2a45b4c2ceb0..feb142fb7a8a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -770,6 +770,23 @@ nouveau_connector_force(struct drm_connector *connector)
 	nouveau_connector_set_encoder(connector, nv_encoder);
 }
 
+int
+nouveau_connector_probe_single_connector_modes(struct drm_connector *connector,
+					       uint32_t maxX, uint32_t maxY)
+{
+	struct device *dev = connector->dev->dev;
+	int ret;
+
+	ret = pm_runtime_get_sync(dev);
+	if (WARN_ON(ret < 0 && ret != -EACCES))
+		return 0;
+
+	ret = drm_helper_probe_single_connector_modes(connector, maxX, maxY);
+
+	pm_runtime_put_autosuspend(dev);
+	return ret;
+}
+
 static int
 nouveau_connector_set_property(struct drm_connector *connector,
 			       struct drm_property *property, uint64_t value)
@@ -1088,7 +1105,7 @@ nouveau_connector_funcs = {
 	.reset = nouveau_conn_reset,
 	.detect = nouveau_connector_detect,
 	.force = nouveau_connector_force,
-	.fill_modes = drm_helper_probe_single_connector_modes,
+	.fill_modes = nouveau_connector_probe_single_connector_modes,
 	.set_property = nouveau_connector_set_property,
 	.destroy = nouveau_connector_destroy,
 	.atomic_duplicate_state = nouveau_conn_atomic_duplicate_state,
@@ -1103,7 +1120,7 @@ nouveau_connector_funcs_lvds = {
 	.reset = nouveau_conn_reset,
 	.detect = nouveau_connector_detect_lvds,
 	.force = nouveau_connector_force,
-	.fill_modes = drm_helper_probe_single_connector_modes,
+	.fill_modes = nouveau_connector_probe_single_connector_modes,
 	.set_property = nouveau_connector_set_property,
 	.destroy = nouveau_connector_destroy,
 	.atomic_duplicate_state = nouveau_conn_atomic_duplicate_state,
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.h b/drivers/gpu/drm/nouveau/nouveau_connector.h
index 2d9d35a146a4..e9ffc6eebda2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.h
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.h
@@ -106,6 +106,9 @@ nouveau_crtc_connector_get(struct nouveau_crtc *nv_crtc)
 
 struct drm_connector *
 nouveau_connector_create(struct drm_device *, const struct dcb_output *);
+int
+nouveau_connector_probe_single_connector_modes(struct drm_connector *,
+					       uint32_t, uint32_t);
 
 extern int nouveau_tv_disable;
 extern int nouveau_ignorelid;
-- 
2.17.1