Re: [PATCH 6/9] drm/i915: Disable scanout VT-d workaround for TGL+

["Hogander, Jouni" <jouni.hogander@intel.com>]

On Wed, 2024-10-09 at 21:22 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> TGL+ should no longer need any VT-d scanout workarounds.
> Don't apply any.
> 
> Not 100% sure whether pre-SNB might also suffer from this. The
> workaround did originate on SNB but who knows if it was just
> never caught before that. Not that I ever managed to enable
> VT-d any older hardware. Last time I tried on my ILK it ate
> the disk!

Any possibility to have bspec reference or is it just some offline
documentation?

BR,

Jouni Högander
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index 2afd10bbe7b8..7c25060e5f32 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -8694,5 +8694,5 @@ void intel_hpd_poll_fini(struct
> drm_i915_private *i915)
>  
>  bool intel_scanout_needs_vtd_wa(struct drm_i915_private *i915)
>  {
> -       return DISPLAY_VER(i915) >= 6 && i915_vtd_active(i915);
> +       return IS_DISPLAY_VER(i915, 6, 11) && i915_vtd_active(i915);
>  }