drm/radeon: reintroduce radeon_dp_work_func content

commit a34fc1bcd2c4d8b09dcfc0b95ac65bca1e579bd7 upstream.

Put back the radeon_dp_work_func logic.  It seems that
handling DP RX interrupts is necessary to make some
panels work.  This was removed with the MST support,
but it regresses some systems so add it back.  While
we are here, add the proper mutex locking.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2567
Fixes: 7a2196c21538 ("drm/radeon: Drop legacy MST support")
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index da2173435eddbfd0b14f11c012f6fb9aca2c9f29..6541c1f6fca61e70a7612f0a5ea43858b4529461 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -100,6 +100,16 @@ static void radeon_hotplug_work_func(struct work_struct *work)
 
 static void radeon_dp_work_func(struct work_struct *work)
 {
+       struct radeon_device *rdev = container_of(work, struct radeon_device,
+                                                 dp_work);
+       struct drm_device *dev = rdev->ddev;
+       struct drm_mode_config *mode_config = &dev->mode_config;
+       struct drm_connector *connector;
+
+       mutex_lock(&mode_config->mutex);
+       list_for_each_entry(connector, &mode_config->connector_list, head)
+               radeon_connector_hotplug(connector);
+       mutex_unlock(&mode_config->mutex);
 }
 
 /**