[PATCH 13/13] drm/amd/display: Skip panel power savings on eDP links without a panel

[Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>]

From: Andre Eikmeyer <dev@deq.rocks>

When GMUX routes the internal panel to the integrated GPU, the eDP link
of the AMD GPU has no sink. It still exposed panel_power_savings, and
tuned writes it on every switch between AC and battery. Each write sends
a hotplug event and the following connector probe runtime resumes the
GPU that GMUX had powered off. Only create the attribute when the link
has a panel.

Signed-off-by: Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>
Signed-off-by: Andre Eikmeyer <dev@deq.rocks>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_backlight.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_backlight.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_backlight.c
index 703d0617d..c8fbd2167 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_backlight.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_backlight.c
@@ -761,6 +761,9 @@ amdgpu_dm_should_create_sysfs(struct amdgpu_dm_connector *amdgpu_dm_connector)
 	if (amdgpu_dm_connector->base.connector_type != DRM_MODE_CONNECTOR_eDP)
 		return false;
 
+	if (!amdgpu_dm_connector->dc_link->edp_sink_present)
+		return false;
+
 	if (link->panel_type != PANEL_TYPE_LCD && !link->panel_config.cacp.cacp_supported)
 		return false;
 
-- 
2.55.0