[PATCH 49/49] drm/i915/bxt: Update max level of vswing

Imre Deak
2015-03-17T09:41:07Z

From: Vandana Kannan <vandana.kannan@intel.com>

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>
---
drivers/gpu/drm/i915/intel_dp.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 1cb6eb0..019c224 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2832,7 +2832,9 @@ 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;
--
2.1.0