[PATCH 4/5] drivers/thunderbolt: Clarify/correct register offsets for tb_cap_plug_events

[Mario Limonciello]

The USB4 1.0 specification outlines the `cap_plug_events` structure in
table 13-14 located on page 507.  This shows that there was a mistake
in VSC_CS_1 where plug events disable should be 4 bits and
"TBT3-Compatible" should be 3 bits.

While correcting the mistake, update the names and comments to more
closely match the specification.  This should not change anything
functionally.

Link: https://www.usb.org/sites/default/files/USB4%20Specification%2020211116.zip
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/thunderbolt/tb_regs.h | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/thunderbolt/tb_regs.h b/drivers/thunderbolt/tb_regs.h
index 70795a2aa9bb..8c42f8bc679e 100644
--- a/drivers/thunderbolt/tb_regs.h
+++ b/drivers/thunderbolt/tb_regs.h
@@ -146,14 +146,14 @@ struct tb_eeprom_ctl {
 
 struct tb_cap_plug_events {
 	struct tb_cap_extended_short cap_header;
-	u32 __unknown1:2;
-	u32 plug_events:5;
-	u32 __unknown2:25;
-	u32 __unknown3;
-	u32 __unknown4;
+	u32 __unknown1:3; /* VSC_CS_1 */
+	u32 plug_events:4; /* VSC_CS_1 */
+	u32 __unknown2:25; /* VSC_CS_1 */
+	u32 vsc_cs_2;
+	u32 vsc_cs_3;
 	struct tb_eeprom_ctl eeprom_ctl;
-	u32 __unknown5[7];
-	u32 drom_offset; /* 32 bit register, but eeprom addresses are 16 bit */
+	u32 __unknown5[7]; /* VSC_CS_5 -> VSC_CS_11 */
+	u32 drom_offset; /* VSC_CS_12: 32 bit register, but eeprom addresses are 16 bit */
 } __packed;
 
 /* device headers */
@@ -464,6 +464,10 @@ struct tb_regs_hop {
 
 /* Plug Events registers */
 #define TB_PLUG_EVENTS_USB_DISABLE		BIT(2)
+#define USB4_PLUG_EVENTS_LANE_DISABLE		BIT(3)
+#define USB4_PLUG_EVENTS_DPOUT_DISABLE		BIT(4)
+#define USB4_PLUG_EVENTS_LOW_DPIN_DISABLE	BIT(5)
+#define USB4_PLUG_EVENTS_HIGH_DPIN_DISABLE	BIT(6)
 
 #define TB_PLUG_EVENTS_PCIE_WR_DATA		0x1b
 #define TB_PLUG_EVENTS_PCIE_CMD			0x1c
-- 
2.34.1