[v1] 8250 DW UART fixes when under constant Rx pressure

[PATCH 0/6] 8250 DW UART fixes when under constant Rx pressure

Ilpo Järvinen posted 6 patches 2 weeks ago

Diff against v2 v3 v4
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drivers/tty/serial/8250/8250.h      |  25 +++
drivers/tty/serial/8250/8250_dw.c   | 297 ++++++++++++++++++++++------
drivers/tty/serial/8250/8250_port.c |  69 ++++---
include/linux/serial_8250.h         |   1 +
4 files changed, 301 insertions(+), 91 deletions(-)

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[PATCH 0/6] 8250 DW UART fixes when under constant Rx pressure

Posted by Ilpo Järvinen 2 weeks ago

Hi all,

Here are fixes to 8250 DW UART conditions that mostly occur in scenarios
under constant Rx pressure which are made complicated by BUSY handling
of DW UARTs (used when !uart_16550_compatible).

A few of the changes touch also 8250_port but it's mostly moving existing
code around (except for the extra synchronize_irq() in shutdown).

I'll do UART_IIR_RX_TIMEOUT move to switch/case separately from this
fix series.

Ilpo Järvinen (6):
  serial: 8250: Protect LCR write in shutdown
  serial: 8250_dw: Avoid unnecessary LCR writes
  serial: 8250_dw: Rework dw8250_handle_irq() locking and IIR handling
  serial: 8250_dw: Rework IIR_NO_INT handling to stop interrupt storm
  serial: 8250: Add late synchronize_irq() to shutdown to handle DW UART
    BUSY
  serial: 8250_dw: Ensure BUSY is deasserted

 drivers/tty/serial/8250/8250.h      |  25 +++
 drivers/tty/serial/8250/8250_dw.c   | 297 ++++++++++++++++++++++------
 drivers/tty/serial/8250/8250_port.c |  69 ++++---
 include/linux/serial_8250.h         |   1 +
 4 files changed, 301 insertions(+), 91 deletions(-)


base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
-- 
2.39.5