drm/i915/cx0: Add MTL+ .get_dplls hook

Add .get_dplls function pointer for MTL+ platforms
to support dpll framework. Reuse the ICL function
pointer.

v2: Getting configuration either for a C10 or on the PTL port B
    eDP on TypeC PHY case for a C20 PHY PLL. Hence refer to this
    case as "non_tc_phy" instead of "c10phy".
v3: Fix comment to "eDP over TypeC" (Suraj)
    Fix pll id as separate variable (Suraj)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://lore.kernel.org/r/20251117104602.2363671-20-mika.kahola@intel.com

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

@@ -203,6 +203,22 @@ enum intel_dpll_id icl_tc_port_to_pll_id(enum tc_port tc_port)
 	return tc_port - TC_PORT_1 + DPLL_ID_ICL_MGPLL1;
 }
 
+enum intel_dpll_id mtl_port_to_pll_id(struct intel_display *display, enum port port)
+{
+	if (port >= PORT_TC1)
+		return icl_tc_port_to_pll_id(intel_port_to_tc(display, port));
+
+	switch (port) {
+	case PORT_A:
+		return DPLL_ID_ICL_DPLL0;
+	case PORT_B:
+		return DPLL_ID_ICL_DPLL1;
+	default:
+		MISSING_CASE(port);
+		return DPLL_ID_ICL_DPLL0;
+	}
+}
+
 static i915_reg_t
 intel_combo_pll_enable_reg(struct intel_display *display,
 			   struct intel_dpll *pll)
@@ -3490,6 +3506,36 @@ static int icl_get_tc_phy_dplls(struct intel_atomic_state *state,
 	return ret;
 }
 
+/*
+ * Get the PLL for either a port using a C10 PHY PLL, or in the
+ * PTL port B eDP over TypeC PHY case, the PLL for a port using
+ * a C20 PHY PLL.
+ */
+static int mtl_get_non_tc_phy_dpll(struct intel_atomic_state *state,
+				      struct intel_crtc *crtc,
+				      struct intel_encoder *encoder)
+{
+	struct intel_display *display = to_intel_display(crtc);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct icl_port_dpll *port_dpll =
+		&crtc_state->icl_port_dplls[ICL_PORT_DPLL_DEFAULT];
+	enum intel_dpll_id pll_id = mtl_port_to_pll_id(display, encoder->port);
+
+	port_dpll->pll = intel_find_dpll(state, crtc,
+					 &port_dpll->hw_state,
+					 BIT(pll_id));
+	if (!port_dpll->pll)
+		return -EINVAL;
+
+	intel_reference_dpll(state, crtc,
+			     port_dpll->pll, &port_dpll->hw_state);
+
+	icl_update_active_dpll(state, crtc, encoder);
+
+	return 0;
+}
+
 static int icl_compute_dplls(struct intel_atomic_state *state,
 			     struct intel_crtc *crtc,
 			     struct intel_encoder *encoder)
@@ -4387,10 +4433,21 @@ static int mtl_compute_dplls(struct intel_atomic_state *state,
 		return mtl_compute_non_tc_phy_dpll(state, crtc, encoder);
 }
 
+static int mtl_get_dplls(struct intel_atomic_state *state,
+			 struct intel_crtc *crtc,
+			 struct intel_encoder *encoder)
+{
+	if (intel_encoder_is_tc(encoder))
+		return icl_get_tc_phy_dplls(state, crtc, encoder);
+	else
+		return mtl_get_non_tc_phy_dpll(state, crtc, encoder);
+}
+
 __maybe_unused
 static const struct intel_dpll_mgr mtl_pll_mgr = {
 	.dpll_info = mtl_plls,
 	.compute_dplls = mtl_compute_dplls,
+	.get_dplls = mtl_get_dplls,
 };
 
 /**

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

@@ -450,6 +450,7 @@ bool intel_dpll_compare_hw_state(struct intel_display *display,
 				 const struct intel_dpll_hw_state *a,
 				 const struct intel_dpll_hw_state *b);
 enum intel_dpll_id icl_tc_port_to_pll_id(enum tc_port tc_port);
+enum intel_dpll_id mtl_port_to_pll_id(struct intel_display *display, enum port port);
 bool intel_dpll_is_combophy(enum intel_dpll_id id);
 
 void intel_dpll_state_verify(struct intel_atomic_state *state,