[PATCH 08/18] i915: split some DP modesetting code into a separate function

[Dariusz Gadomski]

From: Dave Airlie <airlied at redhat.com>

BugLink: https://bugs.launchpad.net/bugs/1104230

this is just prep work for mst support.

Signed-off-by: Dave Airlie <airlied at redhat.com>

Conflicts:
	drivers/gpu/drm/i915/intel_ddi.c

(cherry picked from commit 88657d851fd55e84f7e94cae6e93c228ca3fb5c1 upstream)
Signed-off-by: Dariusz Gadomski <dariusz.gadomski at canonical.com>
---
 drivers/gpu/drm/i915/intel_ddi.c | 15 ++++++++++++---
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index a80cb3e..7a9186f 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -364,6 +364,17 @@ void hsw_fdi_link_train(struct drm_crtc *crtc)
 	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)
 {
@@ -1269,9 +1280,7 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_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);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index f8e0843..991c828 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -717,6 +717,7 @@ void intel_ddi_fdi_disable(struct drm_crtc *crtc);
 void intel_ddi_get_config(struct intel_encoder *encoder,
 			  struct intel_crtc_config *pipe_config);
 
+void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder);
 
 /* intel_display.c */
 const char *intel_output_name(int output);
-- 
1.9.1