On Fri, Jun 17, 2016 at 05:39:51PM +0100, Chris Wilson wrote:
> Erratum SKL075: Display Flicker May Occur When Both VT-d And FBC Are Enabled
>
> "Display flickering may occur when both FBC (Frame Buffer Compression)
> and VT - d (Intel® Virtualization Technology for Directed I/O) are enabled
> and in use by the display controller."
WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_fbc.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
> index fddba1eed5ad..e47785467220 100644
> --- a/drivers/gpu/drm/i915/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/intel_fbc.c
> @@ -1230,6 +1230,18 @@ void intel_fbc_init_pipe_state(struct drm_i915_private *dev_priv)
> dev_priv->fbc.visible_pipes_mask |= (1 << crtc->pipe);
> }
>
> +static bool need_vtd_wa(struct drm_i915_private *dev_priv)
> +{
> +#ifdef CONFIG_INTEL_IOMMU
> + if (!intel_iommu_gfx_mapped)
> + return false;
> +
> + if (INTEL_GEN(dev_priv) == 9)
> + return true;
> +#endif
> + return false;
> +}
> +
> /**
> * intel_fbc_init - Initialize FBC
> * @dev_priv: the i915 device
> @@ -1247,6 +1259,12 @@ void intel_fbc_init(struct drm_i915_private *dev_priv)
> fbc->active = false;
> fbc->work.scheduled = false;
>
> + if (need_vtd_wa(dev_priv)) {
> + struct intel_device_info *info =
> + (struct intel_device_info *)&dev_priv->info;
> + info->has_fbc = false;
> + }
> +
> if (!HAS_FBC(dev_priv)) {
> fbc->no_fbc_reason = "unsupported by this chipset";
> return;
> --
> 2.8.1
>
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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