Luca Fresi 4a8887dd3a serial: sc16is7xx: enable THRI before filling TX FIFO ...

[ Upstream commit 246ac114f4 ]

sc16is7xx_handle_tx() currently requests the THRI enable only after it has
filled the TX FIFO. The request is asynchronous because the IER update is
performed later by reg_work.

The SC16IS7xx generates a THRI interrupt when the TX FIFO crosses its
trigger level. If the FIFO drains past that level before reg_work enables
THRI, the chip does not generate a new interrupt. Characters remain queued
indefinitely even though the hardware FIFO is empty.

This was observed on an SC16IS752 while both UART channels were active.
During the stall the software TX buffer remained non-empty while TXLVL
reported 64 bytes free, LSR reported THR and transmitter empty, IER had
THRI enabled, and IIR reported no interrupt pending.

Enable THRI synchronously before filling the FIFO so the threshold crossing
cannot be missed.

Fixes: cc4c1d05eb ("sc16is7xx: Properly resume TX after stop")
Cc: stable <stable@kernel.org>
Signed-off-by: Luca Fresi <luca.fresi@bithiatec.com>
Link: https://patch.msgid.link/20260721222404.204746-1-luca.fresi@bithiatec.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-08-27 14:29:44 +02:00

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hvc

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ipwireless

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serdev

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serial

serial: sc16is7xx: enable THRI before filling TX FIFO

2026-08-27 14:29:44 +02:00

vt

vt: stabilize tty reference in kbd_keycode with tty_port_tty_get

2026-08-19 18:13:09 +02:00

amiserial.c

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ehv_bytechan.c

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goldfish.c

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Kconfig

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Makefile

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mips_ejtag_fdc.c

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moxa.c

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mxser.c

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n_gsm.c

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n_hdlc.c

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n_null.c

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n_tty.c

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nozomi.c

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pty.c

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rpmsg_tty.c

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synclink_gt.c

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sysrq.c

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tty_audit.c

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tty_baudrate.c

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tty_buffer.c

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tty_io.c

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tty_ioctl.c

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tty_jobctrl.c

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tty_ldisc.c

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tty_ldsem.c

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tty_mutex.c

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tty_port.c

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tty.h

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ttynull.c

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vcc.c

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