diff --git a/drivers/gpu/drm/i915/display/intel_vbt_defs.h b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
index 509b0a419c20..ba328d130991 100644
--- a/drivers/gpu/drm/i915/display/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
@@ -75,6 +75,20 @@ struct bdb_header {
 	u16 bdb_size;
 } __packed;
 
+/*
+ * BDB version number dependencies are documented as:
+ *
+ * <start>+
+ *    indicates the field was introduced in version <start>
+ *    and is still valid
+ *
+ * <start>-<end>
+ *    indicates the field was introduced in version <start>
+ *    and obsoleted in version <end>+1.
+ *
+ * ??? indicates the specific version number is unknown
+ */
+
 /*
  * There are several types of BIOS data blocks (BDBs), each block has
  * an ID and size in the first 3 bytes (ID in first, size in next 2).
@@ -144,12 +158,12 @@ struct bdb_general_features {
         /* bits 3 */
 	u8 disable_smooth_vision:1;
 	u8 single_dvi:1;
-	u8 rotate_180:1;					/* 181 */
+	u8 rotate_180:1;					/* 181+ */
 	u8 fdi_rx_polarity_inverted:1;
-	u8 vbios_extended_mode:1;				/* 160 */
-	u8 copy_ilfp_dtd_to_sdvo_lvds_dtd:1;			/* 160 */
-	u8 panel_best_fit_timing:1;				/* 160 */
-	u8 ignore_strap_state:1;				/* 160 */
+	u8 vbios_extended_mode:1;				/* 160+ */
+	u8 copy_ilfp_dtd_to_sdvo_lvds_dtd:1;			/* 160+ */
+	u8 panel_best_fit_timing:1;				/* 160+ */
+	u8 ignore_strap_state:1;				/* 160+ */
 
         /* bits 4 */
 	u8 legacy_monitor_detect;
@@ -164,11 +178,11 @@ struct bdb_general_features {
 	u8 rsvd11:2; /* finish byte */
 
 	/* bits 6 */
-	u8 tc_hpd_retry_timeout:7; /* 242 */
+	u8 tc_hpd_retry_timeout:7;				/* 242+ */
 	u8 rsvd12:1;
 
 	/* bits 7 */
-	u8 afc_startup_config:2;/* 249 */
+	u8 afc_startup_config:2;				/* 249+ */
 	u8 rsvd13:6;
 } __packed;
 
@@ -275,27 +289,27 @@ struct bdb_general_features {
 #define DVO_PORT_DPC		8
 #define DVO_PORT_DPD		9
 #define DVO_PORT_DPA		10
-#define DVO_PORT_DPE		11				/* 193 */
-#define DVO_PORT_HDMIE		12				/* 193 */
+#define DVO_PORT_DPE		11				/* 193+ */
+#define DVO_PORT_HDMIE		12				/* 193+ */
 #define DVO_PORT_DPF		13				/* N/A */
 #define DVO_PORT_HDMIF		14				/* N/A */
-#define DVO_PORT_DPG		15				/* 217 */
-#define DVO_PORT_HDMIG		16				/* 217 */
-#define DVO_PORT_DPH		17				/* 217 */
-#define DVO_PORT_HDMIH		18				/* 217 */
-#define DVO_PORT_DPI		19				/* 217 */
-#define DVO_PORT_HDMII		20				/* 217 */
-#define DVO_PORT_MIPIA		21				/* 171 */
-#define DVO_PORT_MIPIB		22				/* 171 */
-#define DVO_PORT_MIPIC		23				/* 171 */
-#define DVO_PORT_MIPID		24				/* 171 */
+#define DVO_PORT_DPG		15				/* 217+ */
+#define DVO_PORT_HDMIG		16				/* 217+ */
+#define DVO_PORT_DPH		17				/* 217+ */
+#define DVO_PORT_HDMIH		18				/* 217+ */
+#define DVO_PORT_DPI		19				/* 217+ */
+#define DVO_PORT_HDMII		20				/* 217+ */
+#define DVO_PORT_MIPIA		21				/* 171+ */
+#define DVO_PORT_MIPIB		22				/* 171+ */
+#define DVO_PORT_MIPIC		23				/* 171+ */
+#define DVO_PORT_MIPID		24				/* 171+ */
 
-#define HDMI_MAX_DATA_RATE_PLATFORM	0			/* 204 */
-#define HDMI_MAX_DATA_RATE_297		1			/* 204 */
-#define HDMI_MAX_DATA_RATE_165		2			/* 204 */
-#define HDMI_MAX_DATA_RATE_594		3			/* 249 */
-#define HDMI_MAX_DATA_RATE_340		4			/* 249 */
-#define HDMI_MAX_DATA_RATE_300		5			/* 249 */
+#define HDMI_MAX_DATA_RATE_PLATFORM	0			/* 204+ */
+#define HDMI_MAX_DATA_RATE_297		1			/* 204+ */
+#define HDMI_MAX_DATA_RATE_165		2			/* 204+ */
+#define HDMI_MAX_DATA_RATE_594		3			/* 249+ */
+#define HDMI_MAX_DATA_RATE_340		4			/* 249+ */
+#define HDMI_MAX_DATA_RATE_300		5			/* 249+ */
 
 #define LEGACY_CHILD_DEVICE_CONFIG_SIZE		33
 
@@ -379,19 +393,19 @@ struct child_device_config {
 		u8  device_id[10]; /* ascii string */
 		struct {
 			u8 i2c_speed;
-			u8 dp_onboard_redriver;			/* 158 */
-			u8 dp_ondock_redriver;			/* 158 */
-			u8 hdmi_level_shifter_value:5;		/* 169 */
-			u8 hdmi_max_data_rate:3;		/* 204 */
-			u16 dtd_buf_ptr;			/* 161 */
-			u8 edidless_efp:1;			/* 161 */
-			u8 compression_enable:1;		/* 198 */
-			u8 compression_method_cps:1;		/* 198 */
-			u8 ganged_edp:1;			/* 202 */
+			u8 dp_onboard_redriver;			/* 158+ */
+			u8 dp_ondock_redriver;			/* 158+ */
+			u8 hdmi_level_shifter_value:5;		/* 158+ */
+			u8 hdmi_max_data_rate:3;		/* 204+ */
+			u16 dtd_buf_ptr;			/* 161+ */
+			u8 edidless_efp:1;			/* 161+ */
+			u8 compression_enable:1;		/* 198+ */
+			u8 compression_method_cps:1;		/* 198+ */
+			u8 ganged_edp:1;			/* 202+ */
 			u8 reserved0:4;
-			u8 compression_structure_index:4;	/* 198 */
+			u8 compression_structure_index:4;	/* 198+ */
 			u8 reserved1:4;
-			u8 slave_port;				/* 202 */
+			u8 slave_port;				/* 202+ */
 			u8 reserved2;
 		} __packed;
 	} __packed;
@@ -412,16 +426,16 @@ struct child_device_config {
 			u8 ddc2_pin;
 		} __packed;
 		struct {
-			u8 efp_routed:1;			/* 158 */
-			u8 lane_reversal:1;			/* 184 */
-			u8 lspcon:1;				/* 192 */
-			u8 iboost:1;				/* 196 */
-			u8 hpd_invert:1;			/* 196 */
-			u8 use_vbt_vswing:1;			/* 218 */
+			u8 efp_routed:1;			/* 158+ */
+			u8 lane_reversal:1;			/* 184+ */
+			u8 lspcon:1;				/* 192+ */
+			u8 iboost:1;				/* 196+ */
+			u8 hpd_invert:1;			/* 196+ */
+			u8 use_vbt_vswing:1;			/* 218+ */
 			u8 flag_reserved:2;
-			u8 hdmi_support:1;			/* 158 */
-			u8 dp_support:1;			/* 158 */
-			u8 tmds_support:1;			/* 158 */
+			u8 hdmi_support:1;			/* 158+ */
+			u8 dp_support:1;			/* 158+ */
+			u8 tmds_support:1;			/* 158+ */
 			u8 support_reserved:5;
 			u8 aux_channel;
 			u8 dongle_detect;
@@ -429,7 +443,7 @@ struct child_device_config {
 	} __packed;
 
 	u8 pipe_cap:2;
-	u8 sdvo_stall:1;					/* 158 */
+	u8 sdvo_stall:1;					/* 158+ */
 	u8 hpd_status:2;
 	u8 integrated_encoder:1;
 	u8 capabilities_reserved:2;
@@ -437,21 +451,21 @@ struct child_device_config {
 
 	union {
 		u8 dvo2_wiring;
-		u8 mipi_bridge_type;				/* 171 */
+		u8 mipi_bridge_type;				/* 171+ */
 	} __packed;
 
 	u16 extended_type;
 	u8 dvo_function;
-	u8 dp_usb_type_c:1;					/* 195 */
-	u8 tbt:1;						/* 209 */
-	u8 flags2_reserved:2;					/* 195 */
-	u8 dp_port_trace_length:4;				/* 209 */
-	u8 dp_gpio_index;					/* 195 */
-	u16 dp_gpio_pin_num;					/* 195 */
-	u8 dp_iboost_level:4;					/* 196 */
-	u8 hdmi_iboost_level:4;					/* 196 */
-	u8 dp_max_link_rate:3;					/* 216/230 GLK+ */
-	u8 dp_max_link_rate_reserved:5;				/* 216/230 */
+	u8 dp_usb_type_c:1;					/* 195+ */
+	u8 tbt:1;						/* 209+ */
+	u8 flags2_reserved:2;					/* 195+ */
+	u8 dp_port_trace_length:4;				/* 209+ */
+	u8 dp_gpio_index;					/* 195+ */
+	u16 dp_gpio_pin_num;					/* 195+ */
+	u8 dp_iboost_level:4;					/* 196+ */
+	u8 hdmi_iboost_level:4;					/* 196+ */
+	u8 dp_max_link_rate:3;					/* 216+ */
+	u8 dp_max_link_rate_reserved:5;				/* 216+ */
 } __packed;
 
 struct bdb_general_definitions {
@@ -690,18 +704,18 @@ struct bdb_edp {
 	u32 sdrrs_msa_timing_delay;
 
 	/* ith bit indicates enabled/disabled for (i+1)th panel */
-	u16 edp_s3d_feature;					/* 162 */
-	u16 edp_t3_optimization;				/* 165 */
-	u64 edp_vswing_preemph;					/* 173 */
-	u16 fast_link_training;					/* 182 */
-	u16 dpcd_600h_write_required;				/* 185 */
-	struct edp_pwm_delays pwm_delays[16];			/* 186 */
-	u16 full_link_params_provided;				/* 199 */
-	struct edp_full_link_params full_link_params[16];	/* 199 */
-	u16 apical_enable;					/* 203 */
-	struct edp_apical_params apical_params[16];		/* 203 */
-	u16 edp_fast_link_training_rate[16];			/* 224 */
-	u16 edp_max_port_link_rate[16];				/* 244 */
+	u16 edp_s3d_feature;					/* 162+ */
+	u16 edp_t3_optimization;				/* 165+ */
+	u64 edp_vswing_preemph;					/* 173+ */
+	u16 fast_link_training;					/* 182+ */
+	u16 dpcd_600h_write_required;				/* 185+ */
+	struct edp_pwm_delays pwm_delays[16];			/* 186+ */
+	u16 full_link_params_provided;				/* 199+ */
+	struct edp_full_link_params full_link_params[16];	/* 199+ */
+	u16 apical_enable;					/* 203+ */
+	struct edp_apical_params apical_params[16];		/* 203+ */
+	u16 edp_fast_link_training_rate[16];			/* 224+ */
+	u16 edp_max_port_link_rate[16];				/* 244+ */
 } __packed;
 
 /*
@@ -710,7 +724,7 @@ struct bdb_edp {
 
 struct bdb_lvds_options {
 	u8 panel_type;
-	u8 panel_type2;						/* 212 */
+	u8 panel_type2;						/* 212+ */
 	/* LVDS capabilities, stored in a dword */
 	u8 pfit_mode:2;
 	u8 pfit_text_mode_enhanced:1;
@@ -733,9 +747,9 @@ struct bdb_lvds_options {
 	/* LVDS backlight control type bits stored here */
 	u32 blt_control_type_bits;
 
-	u16 lcdvcc_s0_enable;					/* 200 */
-	u32 rotation;						/* 228 */
-	u32 position;						/* 240 */
+	u16 lcdvcc_s0_enable;					/* 200+ */
+	u32 rotation;						/* 228+ */
+	u32 position;						/* 240+ */
 } __packed;
 
 /*
@@ -756,7 +770,7 @@ struct lvds_lfp_data_ptr {
 struct bdb_lvds_lfp_data_ptrs {
 	u8 lvds_entries;
 	struct lvds_lfp_data_ptr ptr[16];
-	struct lvds_lfp_data_ptr_table panel_name; /* 156-163? */
+	struct lvds_lfp_data_ptr_table panel_name;		/* (156-163?)+ */
 } __packed;
 
 /*
@@ -808,20 +822,20 @@ struct lvds_lfp_panel_name {
 } __packed;
 
 struct lvds_lfp_black_border {
-	u8 top; /* 227 */
-	u8 bottom; /* 227 */
-	u8 left; /* 238 */
-	u8 right; /* 238 */
+	u8 top;		/* 227+ */
+	u8 bottom;	/* 227+ */
+	u8 left;	/* 238+ */
+	u8 right;	/* 238+ */
 } __packed;
 
 struct bdb_lvds_lfp_data_tail {
-	struct lvds_lfp_panel_name panel_name[16]; /* 156-163? */
-	u16 scaling_enable; /* 187 */
-	u8 seamless_drrs_min_refresh_rate[16]; /* 188 */
-	u8 pixel_overlap_count[16]; /* 208 */
-	struct lvds_lfp_black_border black_border[16]; /* 227 */
-	u16 dual_lfp_port_sync_enable; /* 231 */
-	u16 gpu_dithering_for_banding_artifacts; /* 245 */
+	struct lvds_lfp_panel_name panel_name[16];		/* (156-163?)+ */
+	u16 scaling_enable;					/* 187+ */
+	u8 seamless_drrs_min_refresh_rate[16];			/* 188+ */
+	u8 pixel_overlap_count[16];				/* 208+ */
+	struct lvds_lfp_black_border black_border[16];		/* 227+ */
+	u16 dual_lfp_port_sync_enable;				/* 231+ */
+	u16 gpu_dithering_for_banding_artifacts;		/* 245+ */
 } __packed;
 
 /*
@@ -836,7 +850,7 @@ struct lfp_backlight_data_entry {
 	u8 active_low_pwm:1;
 	u8 obsolete1:5;
 	u16 pwm_freq_hz;
-	u8 min_brightness; /* Obsolete from 234+ */
+	u8 min_brightness;					/* ???-233 */
 	u8 obsolete2;
 	u8 obsolete3;
 } __packed;
@@ -859,7 +873,7 @@ struct lfp_brightness_level {
 struct bdb_lfp_backlight_data {
 	u8 entry_size;
 	struct lfp_backlight_data_entry data[16];
-	u8 level[16]; /* Obsolete from 234+ */
+	u8 level[16];							/* ???-233 */
 	struct lfp_backlight_control_method backlight_control[16];
 	struct lfp_brightness_level brightness_level[16];		/* 234+ */
 	struct lfp_brightness_level brightness_min_level[16];		/* 234+ */
@@ -908,11 +922,11 @@ struct bdb_lfp_power {
 	u16 adb;
 	u16 lace_enabled_status;
 	struct aggressiveness_profile_entry aggressiveness[16];
-	u16 hobl; /* 232+ */
-	u16 vrr_feature_enabled; /* 233+ */
-	u16 elp; /* 247+ */
-	u16 opst; /* 247+ */
-	struct aggressiveness_profile2_entry aggressiveness2[16]; /* 247+ */
+	u16 hobl;							/* 232+ */
+	u16 vrr_feature_enabled;					/* 233+ */
+	u16 elp;							/* 247+ */
+	u16 opst;							/* 247+ */
+	struct aggressiveness_profile2_entry aggressiveness2[16];	/* 247+ */
 } __packed;
 
 /*
@@ -922,10 +936,10 @@ struct bdb_lfp_power {
 #define MAX_MIPI_CONFIGURATIONS	6
 
 struct bdb_mipi_config {
-	struct mipi_config config[MAX_MIPI_CONFIGURATIONS]; /* 175 */
-	struct mipi_pps_data pps[MAX_MIPI_CONFIGURATIONS]; /* 177 */
-	struct edp_pwm_delays pwm_delays[MAX_MIPI_CONFIGURATIONS]; /* 186 */
-	u8 pmic_i2c_bus_number[MAX_MIPI_CONFIGURATIONS]; /* 190 */
+	struct mipi_config config[MAX_MIPI_CONFIGURATIONS];		/* 175+ */
+	struct mipi_pps_data pps[MAX_MIPI_CONFIGURATIONS];		/* 177+ */
+	struct edp_pwm_delays pwm_delays[MAX_MIPI_CONFIGURATIONS];	/* 186+ */
+	u8 pmic_i2c_bus_number[MAX_MIPI_CONFIGURATIONS];		/* 190+ */
 } __packed;
 
 /*
