drm/i915: Push TRANS_DDI_FUNC_CTL into the encoder->enable() hook

Push the TRANS_DDI_FUNC_CTL into the encoder enable hook. The disable
is already there, and as a followup will enable us to pass the encoder
all the way down.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200417134720.16654-3-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_crt.c

@@ -308,6 +308,8 @@ static void hsw_enable_crt(struct intel_atomic_state *state,
 
 	drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
 
+	intel_ddi_enable_transcoder_func(crtc_state);
+
 	intel_enable_pipe(crtc_state);
 
 	lpt_pch_enable(crtc_state);

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -3765,6 +3765,8 @@ static void intel_enable_ddi(struct intel_atomic_state *state,
 {
 	WARN_ON(crtc_state->has_pch_encoder);
 
+	intel_ddi_enable_transcoder_func(crtc_state);
+
 	intel_enable_pipe(crtc_state);
 
 	intel_crtc_vblank_on(crtc_state);

drivers/gpu/drm/i915/display/intel_display.c

@@ -7077,9 +7077,6 @@ static void hsw_crtc_enable(struct intel_atomic_state *state,
 	if (INTEL_GEN(dev_priv) >= 11)
 		icl_pipe_mbus_enable(crtc);
 
-	if (!transcoder_is_dsi(cpu_transcoder))
-		intel_ddi_enable_transcoder_func(new_crtc_state);
-
 	intel_encoders_enable(state, crtc);
 
 	if (psl_clkgate_wa) {

drivers/gpu/drm/i915/display/intel_dp_mst.c

@@ -510,6 +510,8 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 
 	drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
 
+	intel_ddi_enable_transcoder_func(pipe_config);
+
 	intel_enable_pipe(pipe_config);
 
 	intel_crtc_vblank_on(pipe_config);