drm/i915/ltphy: Define LT PHY PLL state verify function

Define function to verify the LT PHY PLL state function and call it
in intel_modeset_verify_crtc.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patch.msgid.link/20251101032513.4171255-24-suraj.kandpal@intel.com

Author: surajk8

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

@@ -3575,7 +3575,7 @@ void intel_cx0pll_state_verify(struct intel_atomic_state *state,
 	struct intel_encoder *encoder;
 	struct intel_cx0pll_state mpll_hw_state = {};
 
-	if (DISPLAY_VER(display) < 14)
+	if (!IS_DISPLAY_VER(display, 14, 30))
 		return;
 
 	if (!new_crtc_state->hw.active)

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

@@ -1919,6 +1919,61 @@ void intel_lt_phy_pll_readout_hw_state(struct intel_encoder *encoder,
 	intel_lt_phy_transaction_end(encoder, wakeref);
 }
 
+void intel_lt_phy_pll_state_verify(struct intel_atomic_state *state,
+				   struct intel_crtc *crtc)
+{
+	struct intel_display *display = to_intel_display(state);
+	struct intel_digital_port *dig_port;
+	const struct intel_crtc_state *new_crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_encoder *encoder;
+	struct intel_lt_phy_pll_state pll_hw_state = {};
+	const struct intel_lt_phy_pll_state *pll_sw_state = &new_crtc_state->dpll_hw_state.ltpll;
+	int clock;
+	int i, j;
+
+	if (DISPLAY_VER(display) < 35)
+		return;
+
+	if (!new_crtc_state->hw.active)
+		return;
+
+	/* intel_get_crtc_new_encoder() only works for modeset/fastset commits */
+	if (!intel_crtc_needs_modeset(new_crtc_state) &&
+	    !intel_crtc_needs_fastset(new_crtc_state))
+		return;
+
+	encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
+	intel_lt_phy_pll_readout_hw_state(encoder, new_crtc_state, &pll_hw_state);
+	clock = intel_lt_phy_calc_port_clock(encoder, new_crtc_state);
+
+	dig_port = enc_to_dig_port(encoder);
+	if (intel_tc_port_in_tbt_alt_mode(dig_port))
+		return;
+
+	INTEL_DISPLAY_STATE_WARN(display, pll_hw_state.clock != clock,
+				 "[CRTC:%d:%s] mismatch in LT PHY: Register CLOCK (expected %d, found %d)",
+				 crtc->base.base.id, crtc->base.name,
+				 pll_sw_state->clock, pll_hw_state.clock);
+
+	for (i = 0; i < 3; i++) {
+		INTEL_DISPLAY_STATE_WARN(display, pll_hw_state.config[i] != pll_sw_state->config[i],
+					 "[CRTC:%d:%s] mismatch in LT PHY PLL CONFIG%d: (expected 0x%04x, found 0x%04x)",
+					 crtc->base.base.id, crtc->base.name, i,
+					 pll_sw_state->config[i], pll_hw_state.config[i]);
+	}
+
+	for (i = 0; i <= 12; i++) {
+		for (j = 3; j >= 0; j--)
+			INTEL_DISPLAY_STATE_WARN(display,
+						 pll_hw_state.data[i][j] !=
+						 pll_sw_state->data[i][j],
+						 "[CRTC:%d:%s] mismatch in LT PHY PLL DATA[%d][%d]: (expected 0x%04x, found 0x%04x)",
+						 crtc->base.base.id, crtc->base.name, i, j,
+						 pll_sw_state->data[i][j], pll_hw_state.data[i][j]);
+	}
+}
+
 void intel_xe3plpd_pll_enable(struct intel_encoder *encoder,
 			      const struct intel_crtc_state *crtc_state)
 {
@@ -1938,4 +1993,5 @@ void intel_xe3plpd_pll_disable(struct intel_encoder *encoder)
 		intel_mtl_tbt_pll_disable(encoder);
 	else
 		intel_lt_phy_pll_disable(encoder);
+
 }

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

@@ -8,9 +8,11 @@
 
 #include <linux/types.h>
 
+struct intel_atomic_state;
 struct intel_display;
 struct intel_encoder;
 struct intel_crtc_state;
+struct intel_crtc;
 struct intel_lt_phy_pll_state;
 
 void intel_lt_phy_pll_enable(struct intel_encoder *encoder,
@@ -31,6 +33,8 @@ intel_lt_phy_pll_compare_hw_state(const struct intel_lt_phy_pll_state *a,
 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_lt_phy_pll_state_verify(struct intel_atomic_state *state,
+				   struct intel_crtc *crtc);
 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);

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

@@ -16,6 +16,7 @@
 #include "intel_display_core.h"
 #include "intel_display_types.h"
 #include "intel_fdi.h"
+#include "intel_lt_phy.h"
 #include "intel_modeset_verify.h"
 #include "intel_snps_phy.h"
 #include "skl_watermark.h"
@@ -246,6 +247,7 @@ void intel_modeset_verify_crtc(struct intel_atomic_state *state,
 	intel_dpll_state_verify(state, crtc);
 	intel_mpllb_state_verify(state, crtc);
 	intel_cx0pll_state_verify(state, crtc);
+	intel_lt_phy_pll_state_verify(state, crtc);
 }
 
 void intel_modeset_verify_disabled(struct intel_atomic_state *state)