[Intel-gfx] [PATCH 11/18] drm/i915/display13: Required bandwidth increases when VT-d is active

[Matt Roper]

If VT-d is active, the memory bandwidth usage of the display is 5%
higher.  Take this into account when determining whether we can support
a display configuration.

Bspec: 64631
Cc: Matt Atwood <matthew.s.atwood at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 32522ec1ffb9..14cb3fbf0039 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -398,6 +398,9 @@ static unsigned int intel_bw_data_rate(struct drm_i915_private *dev_priv,
 	for_each_pipe(dev_priv, pipe)
 		data_rate += bw_state->data_rate[pipe];
 
+	if (HAS_DISPLAY13(dev_priv) && intel_vtd_active())
+		data_rate = data_rate * 105 / 100;
+
 	return data_rate;
 }
 
-- 
2.25.4