drm/nvd9-/disp: disable display underflow reporting at init

Reported-by: Andy Ritger <aritger@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
index 52dd7a1..378a015 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
@@ -541,6 +541,15 @@ nvd0_disp_base_init(struct nouveau_object *object)
        nv_wr32(priv, 0x6100a0, 0x00000000);
        nv_wr32(priv, 0x6100b0, 0x00000307);
 
+       /* disable underflow reporting, preventing an intermittent issue
+        * on some nve4 boards where the production vbios left this
+        * setting enabled by default.
+        *
+        * ftp://download.nvidia.com/open-gpu-doc/gk104-disable-underflow-reporting/1/gk104-disable-underflow-reporting.txt
+        */
+       for (i = 0; i < priv->head.nr; i++)
+               nv_mask(priv, 0x616308 + (i * 0x800), 0x00000111, 0x00000010);
+
        return 0;
 }