i915: split some DP modesetting code into a separate function
this is just prep work for mst support.
Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index b226724..1aec425 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -365,6 +365,18 @@
DRM_ERROR("FDI link training failed!\n");
}
+void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder)
+{
+ struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+ struct intel_digital_port *intel_dig_port =
+ enc_to_dig_port(&encoder->base);
+
+ intel_dp->DP = intel_dig_port->saved_port_bits |
+ DDI_BUF_CTL_ENABLE | DDI_BUF_EMP_400MV_0DB_HSW;
+ intel_dp->DP |= DDI_PORT_WIDTH(intel_dp->lane_count);
+
+}
+
static struct intel_encoder *
intel_ddi_get_crtc_encoder(struct drm_crtc *crtc)
{
@@ -1015,12 +1027,8 @@
if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
- struct intel_digital_port *intel_dig_port =
- enc_to_dig_port(encoder);
- intel_dp->DP = intel_dig_port->saved_port_bits |
- DDI_BUF_CTL_ENABLE | DDI_BUF_EMP_400MV_0DB_HSW;
- intel_dp->DP |= DDI_PORT_WIDTH(intel_dp->lane_count);
+ intel_ddi_init_dp_buf_reg(intel_encoder);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
intel_dp_start_link_train(intel_dp);