PCI: Add lane equalization register offsets

As per PCIe spec 6.0.1, add PCIe lane equalization register offset for
data rates 8.0 GT/s, 32.0 GT/s and 64.0 GT/s.

Also add a macro for defining data rate 64.0 GT/s physical layer capability
ID.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://patch.msgid.link/20250328-preset_v6-v9-4-22cfa0490518@oss.qualcomm.com

Author: krishnachaitanya-linux

include/uapi/linux/pci_regs.h

@@ -750,7 +750,8 @@
 #define PCI_EXT_CAP_ID_NPEM	0x29	/* Native PCIe Enclosure Management */
 #define PCI_EXT_CAP_ID_PL_32GT  0x2A    /* Physical Layer 32.0 GT/s */
 #define PCI_EXT_CAP_ID_DOE	0x2E	/* Data Object Exchange */
-#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_DOE
+#define PCI_EXT_CAP_ID_PL_64GT	0x31	/* Physical Layer 64.0 GT/s */
+#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_PL_64GT
 
 #define PCI_EXT_CAP_DSN_SIZEOF	12
 #define PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF 40
@@ -1144,12 +1145,21 @@
 #define PCI_DLF_CAP		0x04	/* Capabilities Register */
 #define  PCI_DLF_EXCHANGE_ENABLE	0x80000000  /* Data Link Feature Exchange Enable */
 
+/* Secondary PCIe Capability 8.0 GT/s */
+#define PCI_SECPCI_LE_CTRL	0x0c /* Lane Equalization Control Register */
+
 /* Physical Layer 16.0 GT/s */
 #define PCI_PL_16GT_LE_CTRL	0x20	/* Lane Equalization Control Register */
 #define  PCI_PL_16GT_LE_CTRL_DSP_TX_PRESET_MASK		0x0000000F
 #define  PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_MASK		0x000000F0
 #define  PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_SHIFT	4
 
+/* Physical Layer 32.0 GT/s */
+#define PCI_PL_32GT_LE_CTRL	0x20	/* Lane Equalization Control Register */
+
+/* Physical Layer 64.0 GT/s */
+#define PCI_PL_64GT_LE_CTRL	0x20	/* Lane Equalization Control Register */
+
 /* Native PCIe Enclosure Management */
 #define PCI_NPEM_CAP     0x04 /* NPEM capability register */
 #define  PCI_NPEM_CAP_CAPABLE     0x00000001 /* NPEM Capable */