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drm/nvd9-/disp: disable display underflow reporting at init
Reported-by: Andy Ritger <aritger@nvidia.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -541,6 +541,15 @@ nvd0_disp_base_init(struct nouveau_object *object)
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nv_wr32(priv, 0x6100a0, 0x00000000);
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nv_wr32(priv, 0x6100b0, 0x00000307);
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/* disable underflow reporting, preventing an intermittent issue
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* on some nve4 boards where the production vbios left this
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* setting enabled by default.
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*
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* ftp://download.nvidia.com/open-gpu-doc/gk104-disable-underflow-reporting/1/gk104-disable-underflow-reporting.txt
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*/
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for (i = 0; i < priv->head.nr; i++)
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nv_mask(priv, 0x616308 + (i * 0x800), 0x00000111, 0x00000010);
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return 0;
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}
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