drm/i915/bxt: Update max level of vswing
Broxton supports 3 voltage swing levels on all DP ports.
Max level of pre-emphasis will be taken care with the existing code.
v2: Patch rebased
v3: (imre)
- keep existing behavior for other platforms
- clarify commit message
Signed-off-by: Vandana Kannan <vandana.kannan@intel.com> (v2)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2e27b52..aa13608 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2887,7 +2887,9 @@
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = dp_to_dig_port(intel_dp)->port;
- if (INTEL_INFO(dev)->gen >= 9) {
+ if (IS_BROXTON(dev))
+ return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
+ else if (INTEL_INFO(dev)->gen >= 9) {
if (dev_priv->vbt.edp_low_vswing && port == PORT_A)
return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
return DP_TRAIN_VOLTAGE_SWING_LEVEL_2;