drm/i915/dpll: add intel_dpll_crtc_compute_clock()

Avoid referencing the function pointer directly to be able to abstract
the call better.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/12ac40c1ef9915fe680c6657b603b08be022626b.1643896905.git.jani.nikula@intel.com

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

@@ -5266,7 +5266,7 @@ static int intel_crtc_atomic_check(struct intel_atomic_state *state,
 
 	if (mode_changed && crtc_state->hw.enable &&
 	    !drm_WARN_ON(&dev_priv->drm, crtc_state->shared_dpll)) {
-		ret = dev_priv->dpll_funcs->crtc_compute_clock(crtc_state);
+		ret = intel_dpll_crtc_compute_clock(crtc_state);
 		if (ret)
 			return ret;
 	}

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

@@ -1400,6 +1400,14 @@ static const struct intel_dpll_funcs i8xx_dpll_funcs = {
 	.crtc_compute_clock = i8xx_crtc_compute_clock,
 };
 
+int intel_dpll_crtc_compute_clock(struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+
+	return i915->dpll_funcs->crtc_compute_clock(crtc_state);
+}
+
 void
 intel_dpll_init_clock_hook(struct drm_i915_private *dev_priv)
 {

drivers/gpu/drm/i915/display/intel_dpll.h

@@ -15,6 +15,7 @@ struct intel_crtc_state;
 enum pipe;
 
 void intel_dpll_init_clock_hook(struct drm_i915_private *dev_priv);
+int intel_dpll_crtc_compute_clock(struct intel_crtc_state *crtc_state);
 int vlv_calc_dpll_params(int refclk, struct dpll *clock);
 int pnv_calc_dpll_params(int refclk, struct dpll *clock);
 int i9xx_calc_dpll_params(int refclk, struct dpll *clock);