From: Vandana Kannan <vandana.kannan@intel.com>
Date: Tue, 18 Nov 2014 10:15:29 +0000 (+0530)
Subject: drm/i915/bxt: Update max level of vswing
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9314726b9f7329e223dd279819b42842ab7d413f;p=linux-beck.git

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 2e27b5215a36..aa13608d27ff 100644
--- 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;