drm/i915: Move DDI clock readout to encoder->get_config()

Move the *_get_ddi_pll() stuff into the encodet->get_config() hook.
There it neatly sits next to the matching .{enable,disable}_clock()
functions.

In order to avoid excessive boilerplate I changed the behaviour
such that all platforms now do the readout via
crtc_state->port_dpll[].

ICL+ TC is still a bit special due to TBTPLL not having a functional
.get_freq(). Should probably change that by adopting the LCPLL
approach, but that would require a fairly substantial rework of the
DPLL ID handling. So leave it for later.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Mika Kahola <[email protected]>

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

@@ -1490,14 +1490,10 @@ static void gen11_dsi_get_cmd_mode_config(struct intel_dsi *intel_dsi,
 static void gen11_dsi_get_config(struct intel_encoder *encoder,
 				 struct intel_crtc_state *pipe_config)
 {
-	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 
-	/* FIXME: adapt icl_ddi_clock_get() for DSI and use that? */
-	pipe_config->port_clock = intel_dpll_get_freq(i915,
-						      pipe_config->shared_dpll,
-						      &pipe_config->dpll_hw_state);
+	intel_ddi_get_clock(encoder, pipe_config, icl_ddi_combo_get_pll(encoder));
 
 	pipe_config->hw.adjusted_mode.crtc_clock = intel_dsi->pclk;
 	if (intel_dsi->dual_link)

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

@@ -142,7 +142,7 @@ static void hsw_crt_get_config(struct intel_encoder *encoder,
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 
-	intel_ddi_get_config(encoder, pipe_config);
+	hsw_ddi_get_config(encoder, pipe_config);
 
 	pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
 					      DRM_MODE_FLAG_NHSYNC |