ice: dpll: fix output pin capabilities

The dpll output pins which are used to feed clock signal of PHY and MAC
circuits cannot be disconnected, those integrated circuits require clock
signal for operation.
By stopping assignment of DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE pin
capability, prevent the user from invoking the state set callback on
those pins, setting the state on those pins already returns error, as
firmware doesn't allow the change of their state.

Fixes: d7999f5 ("ice: implement dpll interface to control cgu")
Fixes: 8a3a565 ("ice: add admin commands to access cgu configuration")
Reviewed-by: Andrii Staikov <andrii.staikov@intel.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Author: kubalewski

drivers/net/ethernet/intel/ice/ice_dpll.c

@@ -1823,6 +1823,7 @@ ice_dpll_init_info_direct_pins(struct ice_pf *pf,
 	int num_pins, i, ret = -EINVAL;
 	struct ice_hw *hw = &pf->hw;
 	struct ice_dpll_pin *pins;
+	unsigned long caps;
 	u8 freq_supp_num;
 	bool input;
 
@@ -1842,6 +1843,7 @@ ice_dpll_init_info_direct_pins(struct ice_pf *pf,
 	}
 
 	for (i = 0; i < num_pins; i++) {
+		caps = 0;
 		pins[i].idx = i;
 		pins[i].prop.board_label = ice_cgu_get_pin_name(hw, i, input);
 		pins[i].prop.type = ice_cgu_get_pin_type(hw, i, input);
@@ -1854,8 +1856,8 @@ ice_dpll_init_info_direct_pins(struct ice_pf *pf,
 						      &dp->input_prio[i]);
 			if (ret)
 				return ret;
-			pins[i].prop.capabilities |=
-				DPLL_PIN_CAPABILITIES_PRIORITY_CAN_CHANGE;
+			caps |= (DPLL_PIN_CAPABILITIES_PRIORITY_CAN_CHANGE |
+				 DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE);
 			pins[i].prop.phase_range.min =
 				pf->dplls.input_phase_adj_max;
 			pins[i].prop.phase_range.max =
@@ -1865,9 +1867,11 @@ ice_dpll_init_info_direct_pins(struct ice_pf *pf,
 				pf->dplls.output_phase_adj_max;
 			pins[i].prop.phase_range.max =
 				-pf->dplls.output_phase_adj_max;
+			ret = ice_cgu_get_output_pin_state_caps(hw, i, &caps);
+			if (ret)
+				return ret;
 		}
-		pins[i].prop.capabilities |=
-			DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE;
+		pins[i].prop.capabilities = caps;
 		ret = ice_dpll_pin_state_update(pf, &pins[i], pin_type, NULL);
 		if (ret)
 			return ret;

drivers/net/ethernet/intel/ice/ice_ptp_hw.c

@@ -3961,3 +3961,57 @@ int ice_get_cgu_rclk_pin_info(struct ice_hw *hw, u8 *base_idx, u8 *pin_num)
 
 	return ret;
 }
+
+/**
+ * ice_cgu_get_output_pin_state_caps - get output pin state capabilities
+ * @hw: pointer to the hw struct
+ * @pin_id: id of a pin
+ * @caps: capabilities to modify
+ *
+ * Return:
+ * * 0 - success, state capabilities were modified
+ * * negative - failure, capabilities were not modified
+ */
+int ice_cgu_get_output_pin_state_caps(struct ice_hw *hw, u8 pin_id,
+				      unsigned long *caps)
+{
+	bool can_change = true;
+
+	switch (hw->device_id) {
+	case ICE_DEV_ID_E810C_SFP:
+		if (pin_id == ZL_OUT2 || pin_id == ZL_OUT3)
+			can_change = false;
+		break;
+	case ICE_DEV_ID_E810C_QSFP:
+		if (pin_id == ZL_OUT2 || pin_id == ZL_OUT3 || pin_id == ZL_OUT4)
+			can_change = false;
+		break;
+	case ICE_DEV_ID_E823L_10G_BASE_T:
+	case ICE_DEV_ID_E823L_1GBE:
+	case ICE_DEV_ID_E823L_BACKPLANE:
+	case ICE_DEV_ID_E823L_QSFP:
+	case ICE_DEV_ID_E823L_SFP:
+	case ICE_DEV_ID_E823C_10G_BASE_T:
+	case ICE_DEV_ID_E823C_BACKPLANE:
+	case ICE_DEV_ID_E823C_QSFP:
+	case ICE_DEV_ID_E823C_SFP:
+	case ICE_DEV_ID_E823C_SGMII:
+		if (hw->cgu_part_number ==
+		    ICE_AQC_GET_LINK_TOPO_NODE_NR_ZL30632_80032 &&
+		    pin_id == ZL_OUT2)
+			can_change = false;
+		else if (hw->cgu_part_number ==
+			 ICE_AQC_GET_LINK_TOPO_NODE_NR_SI5383_5384 &&
+			 pin_id == SI_OUT1)
+			can_change = false;
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (can_change)
+		*caps |= DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE;
+	else
+		*caps &= ~DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE;
+
+	return 0;
+}

drivers/net/ethernet/intel/ice/ice_ptp_hw.h

@@ -282,6 +282,8 @@ int ice_get_cgu_state(struct ice_hw *hw, u8 dpll_idx,
 int ice_get_cgu_rclk_pin_info(struct ice_hw *hw, u8 *base_idx, u8 *pin_num);
 
 void ice_ptp_init_phy_model(struct ice_hw *hw);
+int ice_cgu_get_output_pin_state_caps(struct ice_hw *hw, u8 pin_id,
+				      unsigned long *caps);
 
 #define PFTSYN_SEM_BYTES	4