cti_plx_int_enable(9)

💖 NAME 💖

okay bestie, meet cti_plx_int_enable(9) from the Kernel API Manual ✨ the whole vibe is: Enable UART interrupts to PLX bridge 💅

• cti_plx_int_enable — Enable UART interrupts to PLX bridge

---

✨ SYNOPSIS ✨

the signature ate and left no crumbs:

int cti_plx_int_enable (struct exar8250 *priv );

---

🎀 ARGUMENTS 🎀

• priv — Device's private structure. it's the device's little backstage pass, and yes you need it 🎟️

---

🌸 DESCRIPTION 🌸

okay so real talk: some older CTI cards are built different — they literally require MPIO_0 to be set low to enable the interrupts from the UART to the PLX PCI->PCIe bridge. that's the whole assignment, and this function is the one handling it 💅✨

---

🔥 RETURN 🔥

• 0 — on success, slay 💖
• negative error code — on failure, it's giving flop 😭

---

🦋 SEE ALSO 🦋

• Kernel file: ./drivers/tty/serial/8250/8250_exar.c
• struct exar8250_board(9)
• exar_mpio_config_output(9)
• _exar_mpio_set(9)
• cti_tristate_disable(9)
• cti_read_osc_freq(9)
• cti_get_port_type_xr17c15x_xr17v25x(9)
• cti_get_port_type_fpga(9)
• cti_get_port_type_xr17v35x(9)

---

source/version: ./drivers/tty/serial/8250 · date: October 2026 · cti_plx_int_enable(9) signing off — go get those UART interrupts enabled, bestie 💖👑