drm/i915/ltphy: Define function to readout LT Phy PLL state

Define a function to readout hw state for LT Phy PLL which
can be used in get_config function call.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patch.msgid.link/20251101032513.4171255-23-suraj.kandpal@intel.com

Author: surajk8

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

@@ -4246,6 +4246,19 @@ void intel_ddi_get_clock(struct intel_encoder *encoder,
 						     &crtc_state->dpll_hw_state);
 }
 
+static void xe3plpd_ddi_get_config(struct intel_encoder *encoder,
+				   struct intel_crtc_state *crtc_state)
+{
+	intel_lt_phy_pll_readout_hw_state(encoder, crtc_state, &crtc_state->dpll_hw_state.ltpll);
+
+	if (crtc_state->dpll_hw_state.ltpll.tbt_mode)
+		crtc_state->port_clock = intel_mtl_tbt_calc_port_clock(encoder);
+	else
+		crtc_state->port_clock =
+			intel_lt_phy_calc_port_clock(encoder, crtc_state);
+	intel_ddi_get_config(encoder, crtc_state);
+}
+
 static void mtl_ddi_get_config(struct intel_encoder *encoder,
 			       struct intel_crtc_state *crtc_state)
 {
@@ -5241,6 +5254,7 @@ void intel_ddi_init(struct intel_display *display,
 		encoder->enable_clock = intel_xe3plpd_pll_enable;
 		encoder->disable_clock = intel_xe3plpd_pll_disable;
 		encoder->port_pll_type = intel_mtl_port_pll_type;
+		encoder->get_config = xe3plpd_ddi_get_config;
 	} else if (DISPLAY_VER(display) >= 14) {
 		encoder->enable_clock = intel_mtl_pll_enable;
 		encoder->disable_clock = intel_mtl_pll_disable;

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

@@ -1886,6 +1886,39 @@ intel_lt_phy_pll_compare_hw_state(const struct intel_lt_phy_pll_state *a,
 	return true;
 }
 
+void intel_lt_phy_pll_readout_hw_state(struct intel_encoder *encoder,
+				       const struct intel_crtc_state *crtc_state,
+				       struct intel_lt_phy_pll_state *pll_state)
+{
+	u8 owned_lane_mask;
+	u8 lane;
+	intel_wakeref_t wakeref;
+	int i, j, k;
+
+	pll_state->tbt_mode = intel_tc_port_in_tbt_alt_mode(enc_to_dig_port(encoder));
+	if (pll_state->tbt_mode)
+		return;
+
+	owned_lane_mask = intel_lt_phy_get_owned_lane_mask(encoder);
+	lane = owned_lane_mask & INTEL_LT_PHY_LANE0 ? : INTEL_LT_PHY_LANE1;
+	wakeref = intel_lt_phy_transaction_begin(encoder);
+
+	pll_state->config[0] = intel_lt_phy_read(encoder, lane, LT_PHY_VDR_0_CONFIG);
+	pll_state->config[1] = intel_lt_phy_read(encoder, INTEL_LT_PHY_LANE0, LT_PHY_VDR_1_CONFIG);
+	pll_state->config[2] = intel_lt_phy_read(encoder, lane, LT_PHY_VDR_2_CONFIG);
+
+	for (i = 0; i <= 12; i++) {
+		for (j = 3, k = 0; j >= 0; j--, k++)
+			pll_state->data[i][k] =
+				intel_lt_phy_read(encoder, INTEL_LT_PHY_LANE0,
+						  LT_PHY_VDR_X_DATAY(i, j));
+	}
+
+	pll_state->clock =
+		intel_lt_phy_calc_port_clock(encoder, crtc_state);
+	intel_lt_phy_transaction_end(encoder, wakeref);
+}
+
 void intel_xe3plpd_pll_enable(struct intel_encoder *encoder,
 			      const struct intel_crtc_state *crtc_state)
 {

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

@@ -28,6 +28,9 @@ void intel_lt_phy_dump_hw_state(struct intel_display *display,
 bool
 intel_lt_phy_pll_compare_hw_state(const struct intel_lt_phy_pll_state *a,
 				  const struct intel_lt_phy_pll_state *b);
+void intel_lt_phy_pll_readout_hw_state(struct intel_encoder *encoder,
+				       const struct intel_crtc_state *crtc_state,
+				       struct intel_lt_phy_pll_state *pll_state);
 void intel_xe3plpd_pll_enable(struct intel_encoder *encoder,
 			      const struct intel_crtc_state *crtc_state);
 void intel_xe3plpd_pll_disable(struct intel_encoder *encoder);