[v3,07/48] drm/i915/xelpd: Required bandwidth increases when VT-d is active

Commit Message

Matt Roper May 8, 2021, 2:27 a.m. UTC

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 <[e-mail]>
Signed-off-by: Matt Roper <[e-mail]>
Reviewed-by: Anusha Srivatsa <[e-mail]>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 969169743630..a35435083b60 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -344,6 +344,9 @@  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 (DISPLAY_VER(dev_priv) >= 13 && intel_vtd_active())
+		data_rate = data_rate * 105 / 100;
+
 	return data_rate;
 }