From: Alex Deucher <alexander.deucher@xxxxxxx> 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: 01ad1d9c2888 ("drm/radeon: Drop legacy MST support") Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Cc: Lyude Paul <lyude@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/radeon/radeon_irq_kms.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- 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(str 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); } /**
