drm/i915/ltphy: Define the LT Phy state compare function

Define function to compare the state and if mismatch is detected
dump both the states.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patch.msgid.link/20251101032513.4171255-22-suraj.kandpal@intel.com

Author: surajk8

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

@@ -100,6 +100,7 @@
 #include "intel_hdmi.h"
 #include "intel_hotplug.h"
 #include "intel_link_bw.h"
+#include "intel_lt_phy.h"
 #include "intel_lvds.h"
 #include "intel_lvds_regs.h"
 #include "intel_modeset_setup.h"
@@ -5000,6 +5001,24 @@ static bool allow_vblank_delay_fastset(const struct intel_crtc_state *old_crtc_s
 	       !intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_DSI);
 }
 
+static void
+pipe_config_lt_phy_pll_mismatch(struct drm_printer *p, bool fastset,
+				const struct intel_crtc *crtc,
+				const char *name,
+				const struct intel_lt_phy_pll_state *a,
+				const struct intel_lt_phy_pll_state *b)
+{
+	struct intel_display *display = to_intel_display(crtc);
+	char *chipname = "LTPHY";
+
+	pipe_config_mismatch(p, fastset, crtc, name, chipname);
+
+	drm_printf(p, "expected:\n");
+	intel_lt_phy_dump_hw_state(display, a);
+	drm_printf(p, "found:\n");
+	intel_lt_phy_dump_hw_state(display, b);
+}
+
 bool
 intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 			  const struct intel_crtc_state *pipe_config,
@@ -5124,6 +5143,16 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 	} \
 } while (0)
 
+#define PIPE_CONF_CHECK_PLL_LT(name) do { \
+	if (!intel_lt_phy_pll_compare_hw_state(&current_config->name, \
+					       &pipe_config->name)) { \
+		pipe_config_lt_phy_pll_mismatch(&p, fastset, crtc, __stringify(name), \
+						&current_config->name, \
+						&pipe_config->name); \
+		ret = false; \
+	} \
+} while (0)
+
 #define PIPE_CONF_CHECK_TIMINGS(name) do {     \
 	PIPE_CONF_CHECK_I(name.crtc_hdisplay); \
 	PIPE_CONF_CHECK_I(name.crtc_htotal); \
@@ -5351,7 +5380,9 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 		PIPE_CONF_CHECK_PLL(dpll_hw_state);
 
 	/* FIXME convert MTL+ platforms over to dpll_mgr */
-	if (DISPLAY_VER(display) >= 14)
+	if (HAS_LT_PHY(display))
+		PIPE_CONF_CHECK_PLL_LT(dpll_hw_state.ltpll);
+	else if (DISPLAY_VER(display) >= 14)
 		PIPE_CONF_CHECK_PLL_CX0(dpll_hw_state.cx0pll);
 
 	PIPE_CONF_CHECK_X(dsi_pll.ctrl);

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

@@ -1856,6 +1856,36 @@ void intel_lt_phy_set_signal_levels(struct intel_encoder *encoder,
 	intel_lt_phy_transaction_end(encoder, wakeref);
 }
 
+void intel_lt_phy_dump_hw_state(struct intel_display *display,
+				const struct intel_lt_phy_pll_state *hw_state)
+{
+	int i, j;
+
+	drm_dbg_kms(display->drm, "lt_phy_pll_hw_state:\n");
+	for (i = 0; i < 3; i++) {
+		drm_dbg_kms(display->drm, "config[%d] = 0x%.4x,\n",
+			    i, hw_state->config[i]);
+	}
+
+	for (i = 0; i <= 12; i++)
+		for (j = 3; j >= 0; j--)
+			drm_dbg_kms(display->drm, "vdr_data[%d][%d] = 0x%.4x,\n",
+				    i, j, hw_state->data[i][j]);
+}
+
+bool
+intel_lt_phy_pll_compare_hw_state(const struct intel_lt_phy_pll_state *a,
+				  const struct intel_lt_phy_pll_state *b)
+{
+	if (memcmp(&a->config, &b->config, sizeof(a->config)) != 0)
+		return false;
+
+	if (memcmp(&a->data, &b->data, sizeof(a->data)) != 0)
+		return false;
+
+	return true;
+}
+
 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

@@ -8,6 +8,7 @@
 
 #include <linux/types.h>
 
+struct intel_display;
 struct intel_encoder;
 struct intel_crtc_state;
 struct intel_lt_phy_pll_state;
@@ -22,6 +23,11 @@ int intel_lt_phy_calc_port_clock(struct intel_encoder *encoder,
 				 const struct intel_crtc_state *crtc_state);
 void intel_lt_phy_set_signal_levels(struct intel_encoder *encoder,
 				    const struct intel_crtc_state *crtc_state);
+void intel_lt_phy_dump_hw_state(struct intel_display *display,
+				const struct intel_lt_phy_pll_state *hw_state);
+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_xe3plpd_pll_enable(struct intel_encoder *encoder,
 			      const struct intel_crtc_state *crtc_state);
 void intel_xe3plpd_pll_disable(struct intel_encoder *encoder);