[PATCH 1/3] PCI: Add PCIE_SPEED2LNKCTL2_TLS_ENC conversion macro

[Hans Zhang]

Introduce PCIE_SPEED2LNKCTL2_TLS_ENC macro to standardize the conversion
between PCIe speed enumerations and LNKCTL2_TLS register values. This
centralizes speed-to-register mapping logic, eliminating duplicated
conversion code across multiple drivers.

Signed-off-by: Hans Zhang <18255117159@xxxxxxx>
---
 drivers/pci/pci.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index f92928dadc6a..b7e2d08825c6 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -415,6 +415,15 @@ void pci_bus_put(struct pci_bus *bus);
 	 (lnkctl2) == PCI_EXP_LNKCTL2_TLS_2_5GT ? PCIE_SPEED_2_5GT : \
 	 PCI_SPEED_UNKNOWN)
 
+#define PCIE_SPEED2LNKCTL2_TLS_ENC(speed) \
+	((speed) == PCIE_SPEED_2_5GT ? PCI_EXP_LNKCTL2_TLS_2_5GT : \
+	 (speed) == PCIE_SPEED_5_0GT ? PCI_EXP_LNKCTL2_TLS_5_0GT : \
+	 (speed) == PCIE_SPEED_8_0GT ? PCI_EXP_LNKCTL2_TLS_8_0GT : \
+	 (speed) == PCIE_SPEED_16_0GT ? PCI_EXP_LNKCTL2_TLS_16_0GT : \
+	 (speed) == PCIE_SPEED_32_0GT ? PCI_EXP_LNKCTL2_TLS_32_0GT : \
+	 (speed) == PCIE_SPEED_64_0GT ? PCI_EXP_LNKCTL2_TLS_64_0GT : \
+	 0)
+
 /* PCIe speed to Mb/s reduced by encoding overhead */
 #define PCIE_SPEED2MBS_ENC(speed) \
 	((speed) == PCIE_SPEED_64_0GT ? 64000*1/1 : \
-- 
2.25.1