drm/nv50/dp: fix hack to work for macbooks booted via EFI

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nv50_sor.c b/drivers/gpu/drm/nouveau/nv50_sor.c
index c25c59386420d4a3c5eca828238e60edabd51fe3..ffe8b483b7b0735a175d49ef0601d313c247f944 100644 (file)
--- a/drivers/gpu/drm/nouveau/nv50_sor.c
+++ b/drivers/gpu/drm/nouveau/nv50_sor.c
@@ -318,6 +318,8 @@ nv50_sor_create(struct drm_connector *connector, struct dcb_entry *entry)
                uint32_t tmp;
 
                tmp = nv_rd32(dev, 0x61c700 + (or * 0x800));
+               if (!tmp)
+                       tmp = nv_rd32(dev, 0x610798 + (or * 8));
 
                switch ((tmp & 0x00000f00) >> 8) {
                case 8: