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Subject[PATCH AUTOSEL 5.4 143/350] drm/nouveau: Resume hotplug interrupts earlier
Date
From: Lyude Paul <lyude@redhat.com>

[ Upstream commit ac0de16a38a9ec7026ca96132e3883c564497068 ]

Currently, we enable hotplug detection only after we re-enable the
display. However, this is too late if we're planning on sending sideband
messages during the resume process - which we'll need to do in order to
reprobe the topology on resume.

So, enable hotplug events before reinitializing the display.

Cc: Juston Li <juston.li@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Harry Wentland <hwentlan@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-11-lyude@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/nouveau/nouveau_display.c | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 6f038511a03a9..53f9bceaf17a5 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -407,6 +407,17 @@ nouveau_display_init(struct drm_device *dev, bool resume, bool runtime)
struct drm_connector_list_iter conn_iter;
int ret;

+ /*
+ * Enable hotplug interrupts (done as early as possible, since we need
+ * them for MST)
+ */
+ drm_connector_list_iter_begin(dev, &conn_iter);
+ nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
+ struct nouveau_connector *conn = nouveau_connector(connector);
+ nvif_notify_get(&conn->hpd);
+ }
+ drm_connector_list_iter_end(&conn_iter);
+
ret = disp->init(dev, resume, runtime);
if (ret)
return ret;
@@ -416,14 +427,6 @@ nouveau_display_init(struct drm_device *dev, bool resume, bool runtime)
*/
drm_kms_helper_poll_enable(dev);

- /* enable hotplug interrupts */
- drm_connector_list_iter_begin(dev, &conn_iter);
- nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
- struct nouveau_connector *conn = nouveau_connector(connector);
- nvif_notify_get(&conn->hpd);
- }
- drm_connector_list_iter_end(&conn_iter);
-
return ret;
}

--
2.20.1
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