[PATCH 3/4] nouveau: fall back to ACPI EDID retrieval

[Daniel Dadap <ddadap-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

Fall back to retrieving the EDID via the ACPI _DDC method, when present
for notebook internal panels, when EDID retrieval via the standard EDID
paths is unsuccessful.

Signed-off-by: Daniel Dadap <ddadap-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/gpu/drm/nouveau/nouveau_connector.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 9a9a7f5003d3..95836a02a06b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -581,6 +581,12 @@ nouveau_connector_detect(struct drm_connector *connector, bool force)
 		else
 			nv_connector->edid = drm_get_edid(connector, i2c);
 
+		if (!nv_connector->edid &&
+			(nv_connector->type == DCB_CONNECTOR_LVDS ||
+			nv_connector->type == DCB_CONNECTOR_eDP)) {
+			nv_connector->edid = drm_get_edid_acpi();
+		}
+
 		drm_connector_update_edid_property(connector,
 							nv_connector->edid);
 		if (!nv_connector->edid) {
-- 
2.18.4