Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>


On 3/17/2015 3:10 PM, Imre Deak wrote:
> 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;