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drm/nvd9-/disp: disable display underflow reporting at init
author
Ben Skeggs
<bskeggs@redhat.com>
Thu, 24 Oct 2013 23:59:14 +0000
(09:59 +1000)
committer
Ben Skeggs
<bskeggs@redhat.com>
Fri, 8 Nov 2013 05:39:53 +0000
(15:39 +1000)
Reported-by: Andy Ritger <aritger@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
patch
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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;
}