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 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2887,7 +2887,9 @@ intel_dp_voltage_max(struct intel_dp *intel_dp)
        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;