drm/i915/ltphy: Hook up LT Phy Enable & Disable sequences

Hook up the LT Phy enable and disable sequences using encoder->
enable/disable_clock and reusing the TBT enable disable sequence from
cx0 PHY since it remains the same.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patch.msgid.link/20251101032513.4171255-18-suraj.kandpal@intel.com

Author: surajk8

drivers/gpu/drm/i915/display/intel_cx0_phy.c

@@ -18,6 +18,7 @@
 #include "intel_display_utils.h"
 #include "intel_dp.h"
 #include "intel_hdmi.h"
+#include "intel_lt_phy.h"
 #include "intel_panel.h"
 #include "intel_psr.h"
 #include "intel_snps_hdmi_pll.h"
@@ -3150,8 +3151,8 @@ static int intel_mtl_tbt_clock_select(struct intel_display *display,
 	}
 }
 
-static void intel_mtl_tbt_pll_enable(struct intel_encoder *encoder,
-				     const struct intel_crtc_state *crtc_state)
+void intel_mtl_tbt_pll_enable(struct intel_encoder *encoder,
+			      const struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(encoder);
 	enum phy phy = intel_encoder_to_phy(encoder);
@@ -3335,7 +3336,7 @@ static bool intel_cx0_pll_is_enabled(struct intel_encoder *encoder)
 			     intel_cx0_get_pclk_pll_request(lane);
 }
 
-static void intel_mtl_tbt_pll_disable(struct intel_encoder *encoder)
+void intel_mtl_tbt_pll_disable(struct intel_encoder *encoder)
 {
 	struct intel_display *display = to_intel_display(encoder);
 	enum phy phy = intel_encoder_to_phy(encoder);

drivers/gpu/drm/i915/display/intel_cx0_phy.h

@@ -63,5 +63,8 @@ int intel_mtl_tbt_calc_port_clock(struct intel_encoder *encoder);
 void intel_cx0_pll_power_save_wa(struct intel_display *display);
 void intel_lnl_mac_transmit_lfps(struct intel_encoder *encoder,
 				 const struct intel_crtc_state *crtc_state);
+void intel_mtl_tbt_pll_enable(struct intel_encoder *encoder,
+			      const struct intel_crtc_state *crtc_state);
+void intel_mtl_tbt_pll_disable(struct intel_encoder *encoder);
 
 #endif /* __INTEL_CX0_PHY_H__ */

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

@@ -72,6 +72,7 @@
 #include "intel_hotplug.h"
 #include "intel_hti.h"
 #include "intel_lspcon.h"
+#include "intel_lt_phy.h"
 #include "intel_mg_phy_regs.h"
 #include "intel_modeset_lock.h"
 #include "intel_panel.h"
@@ -5231,7 +5232,11 @@ void intel_ddi_init(struct intel_display *display,
 	encoder->cloneable = 0;
 	encoder->pipe_mask = ~0;
 
-	if (DISPLAY_VER(display) >= 14) {
+	if (HAS_LT_PHY(display)) {
+		encoder->enable_clock = intel_xe3plpd_pll_enable;
+		encoder->disable_clock = intel_xe3plpd_pll_disable;
+		encoder->port_pll_type = intel_mtl_port_pll_type;
+	} else if (DISPLAY_VER(display) >= 14) {
 		encoder->enable_clock = intel_mtl_pll_enable;
 		encoder->disable_clock = intel_mtl_pll_disable;
 		encoder->port_pll_type = intel_mtl_port_pll_type;

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

@@ -1705,3 +1705,24 @@ void intel_lt_phy_pll_disable(struct intel_encoder *encoder)
 
 	intel_lt_phy_transaction_end(encoder, wakeref);
 }
+
+void intel_xe3plpd_pll_enable(struct intel_encoder *encoder,
+			      const struct intel_crtc_state *crtc_state)
+{
+	struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
+
+	if (intel_tc_port_in_tbt_alt_mode(dig_port))
+		intel_mtl_tbt_pll_enable(encoder, crtc_state);
+	else
+		intel_lt_phy_pll_enable(encoder, crtc_state);
+}
+
+void intel_xe3plpd_pll_disable(struct intel_encoder *encoder)
+{
+	struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
+
+	if (intel_tc_port_in_tbt_alt_mode(dig_port))
+		intel_mtl_tbt_pll_disable(encoder);
+	else
+		intel_lt_phy_pll_disable(encoder);
+}

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

@@ -20,6 +20,9 @@ intel_lt_phy_pll_calc_state(struct intel_crtc_state *crtc_state,
 			    struct intel_encoder *encoder);
 int intel_lt_phy_calc_port_clock(struct intel_encoder *encoder,
 				 const struct intel_crtc_state *crtc_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);
 
 #define HAS_LT_PHY(display) (DISPLAY_VER(display) >= 35)