1 files changed, 25 insertions, 3 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index e7e69ccce5c9..61d932261356 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -6205,6 +6205,30 @@ nouveau_bios_i2c_devices_takedown(struct drm_device *dev)
                 nouveau_i2c_fini(dev, entry);
 }
 
+static bool
+nouveau_bios_posted(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        bool was_locked;
+        unsigned htotal;
+
+        if (dev_priv->chipset >= NV_50) {
+                if (NVReadVgaCrtc(dev, 0, 0x00) == 0 &&
+                    NVReadVgaCrtc(dev, 0, 0x1a) == 0)
+                        return false;
+                return true;
+        }
+
+        was_locked = NVLockVgaCrtcs(dev, false);
+        htotal  = NVReadVgaCrtc(dev, 0, 0x06);
+        htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x01) << 8;
+        htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x20) << 4;
+        htotal |= (NVReadVgaCrtc(dev, 0, 0x25) & 0x01) << 10;
+        htotal |= (NVReadVgaCrtc(dev, 0, 0x41) & 0x01) << 11;
+        NVLockVgaCrtcs(dev, was_locked);
+        return (htotal != 0);
+}
+
 int
 nouveau_bios_init(struct drm_device *dev)
 {
@@ -6239,9 +6263,7 @@ nouveau_bios_init(struct drm_device *dev)
         bios->execute = false;
 
         /* ... unless card isn't POSTed already */
-        if (dev_priv->card_type >= NV_10 &&
-            NVReadVgaCrtc(dev, 0, 0x00) == 0 &&
-            NVReadVgaCrtc(dev, 0, 0x1a) == 0) {
+        if (!nouveau_bios_posted(dev)) {
                 NV_INFO(dev, "Adaptor not initialised\n");
                 if (dev_priv->card_type < NV_50) {
                         NV_ERROR(dev, "Unable to POST this chipset\n");