drm/i915/intel_combo_phy: Print I/O voltage info

Print I/O voltage and process info for each combo phy ports.

v2: Used drm_dbg_kms for logs. (Jani)
Added names for different voltage levels. (Imre)

v3: Used const char * for names. (Jani)

v4: Dropped the procom values and changed commit msg (Imre)
Suggested-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220323094307.2439004-1-ankit.k.nautiyal@intel.com

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

@@ -25,18 +25,29 @@ enum {
 };
 
 static const struct icl_procmon {
+	const char *name;
 	u32 dw1, dw9, dw10;
 } icl_procmon_values[] = {
-	[PROCMON_0_85V_DOT_0] =
-		{ .dw1 = 0x00000000, .dw9 = 0x62AB67BB, .dw10 = 0x51914F96, },
-	[PROCMON_0_95V_DOT_0] =
-		{ .dw1 = 0x00000000, .dw9 = 0x86E172C7, .dw10 = 0x77CA5EAB, },
-	[PROCMON_0_95V_DOT_1] =
-		{ .dw1 = 0x00000000, .dw9 = 0x93F87FE1, .dw10 = 0x8AE871C5, },
-	[PROCMON_1_05V_DOT_0] =
-		{ .dw1 = 0x00000000, .dw9 = 0x98FA82DD, .dw10 = 0x89E46DC1, },
-	[PROCMON_1_05V_DOT_1] =
-		{ .dw1 = 0x00440000, .dw9 = 0x9A00AB25, .dw10 = 0x8AE38FF1, },
+	[PROCMON_0_85V_DOT_0] = {
+		.name = "0.85V dot0 (low-voltage)",
+		.dw1 = 0x00000000, .dw9 = 0x62AB67BB, .dw10 = 0x51914F96,
+	},
+	[PROCMON_0_95V_DOT_0] = {
+		.name = "0.95V dot0",
+		.dw1 = 0x00000000, .dw9 = 0x86E172C7, .dw10 = 0x77CA5EAB,
+	},
+	[PROCMON_0_95V_DOT_1] = {
+		.name = "0.95V dot1",
+		.dw1 = 0x00000000, .dw9 = 0x93F87FE1, .dw10 = 0x8AE871C5,
+	},
+	[PROCMON_1_05V_DOT_0] = {
+		.name = "1.05V dot0",
+		.dw1 = 0x00000000, .dw9 = 0x98FA82DD, .dw10 = 0x89E46DC1,
+	},
+	[PROCMON_1_05V_DOT_1] = {
+		.name = "1.05V dot1",
+		.dw1 = 0x00440000, .dw9 = 0x9A00AB25, .dw10 = 0x8AE38FF1,
+	},
 };
 
 static const struct icl_procmon *
@@ -113,6 +124,10 @@ static bool icl_verify_procmon_ref_values(struct drm_i915_private *dev_priv,
 
 	procmon = icl_get_procmon_ref_values(dev_priv, phy);
 
+	drm_dbg_kms(&dev_priv->drm,
+		    "Combo PHY %c Voltage/Process Info : %s\n",
+		    phy_name(phy), procmon->name);
+
 	ret = check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW1(phy),
 			    (0xff << 16) | 0xff, procmon->dw1);
 	ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW9(phy),