drm/i915/icl: remove dpll from clk_sel

We should not pass DPLL_ID_ICL_DPLL0 or DPLL_ID_ICL_DPLL1 to this
function because the path is only taken for non-combophy ports. Let the
warning trigger if improper value is given.

While at it, rename the function to match the register name we are
trying to program.

v2: fix typo in comment
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190125222444.19926-4-lucas.demarchi@intel.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -995,7 +995,7 @@ static u32 hsw_pll_to_ddi_pll_sel(const struct intel_shared_dpll *pll)
 	}
 }
 
-static u32 icl_pll_to_ddi_pll_sel(struct intel_encoder *encoder,
+static u32 icl_pll_to_ddi_clk_sel(struct intel_encoder *encoder,
 				  const struct intel_crtc_state *crtc_state)
 {
 	const struct intel_shared_dpll *pll = crtc_state->shared_dpll;
@@ -1004,10 +1004,11 @@ static u32 icl_pll_to_ddi_pll_sel(struct intel_encoder *encoder,
 
 	switch (id) {
 	default:
+		/*
+		 * DPLL_ID_ICL_DPLL0 and DPLL_ID_ICL_DPLL1 should not be used
+		 * here, so do warn if this get passed in
+		 */
 		MISSING_CASE(id);
-		/* fall through */
-	case DPLL_ID_ICL_DPLL0:
-	case DPLL_ID_ICL_DPLL1:
 		return DDI_CLK_SEL_NONE;
 	case DPLL_ID_ICL_TBTPLL:
 		switch (clock) {
@@ -2869,7 +2870,7 @@ static void intel_ddi_clk_select(struct intel_encoder *encoder,
 	if (IS_ICELAKE(dev_priv)) {
 		if (!intel_port_is_combophy(dev_priv, port))
 			I915_WRITE(DDI_CLK_SEL(port),
-				   icl_pll_to_ddi_pll_sel(encoder, crtc_state));
+				   icl_pll_to_ddi_clk_sel(encoder, crtc_state));
 	} else if (IS_CANNONLAKE(dev_priv)) {
 		/* Configure DPCLKA_CFGCR0 to map the DPLL to the DDI. */
 		val = I915_READ(DPCLKA_CFGCR0);