[PATCH] drm: Fix output poll work for drm_kms_helper_poll=n

[Imre Deak]

If drm_kms_helper_poll=n the output poll work will only get scheduled
from drm_helper_probe_single_connector_modes() to handle a delayed
hotplug event. Since polling is disabled the work in this case should
just call drm_kms_helper_hotplug_event() w/o detecting the state of
connectors and rescheduling the work.

After commit d33a54e3991d after a delayed hotplug event above the
connectors did get re-detected in the poll work and the work got
re-scheduled periodically (since poll_running is also false if
drm_kms_helper_poll=n), in effect ignoring the drm_kms_helper_poll=n
kernel param.

Fix the above by calling only drm_kms_helper_hotplug_event() for a
delayed hotplug event if drm_kms_helper_hotplug_event=n, as was done
before d33a54e3991d.

Cc: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
Reported-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Fixes: d33a54e3991d ("drm/probe_helper: sort out poll_running vs poll_enabled")
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/drm_probe_helper.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 19ecb749704be..4d60cc810b577 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -767,9 +767,11 @@ static void output_poll_execute(struct work_struct *work)
 	changed = dev->mode_config.delayed_event;
 	dev->mode_config.delayed_event = false;
 
-	if (!drm_kms_helper_poll && dev->mode_config.poll_running) {
-		drm_kms_helper_disable_hpd(dev);
-		dev->mode_config.poll_running = false;
+	if (!drm_kms_helper_poll) {
+		if (dev->mode_config.poll_running) {
+			drm_kms_helper_disable_hpd(dev);
+			dev->mode_config.poll_running = false;
+		}
 		goto out;
 	}
 
-- 
2.43.3