linux-kernel - [PATCH tty-next v5 0/6] convert 8250 to nbcon

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Message-Id: <20250107212702.169493-1-john.ogness@linutronix.de>
Date: Tue,  7 Jan 2025 22:32:56 +0106
From: John Ogness <john.ogness@...utronix.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jirislaby@...nel.org>,
	Petr Mladek <pmladek@...e.com>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Esben Haabendal <esben@...nix.com>,
	linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Serge Semin <fancer.lancer@...il.com>,
	Wander Lairson Costa <wander@...hat.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	Stefan Wahren <wahrenst@....net>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	Kevin Hilman <khilman@...libre.com>,
	Markus Schneider-Pargmann <msp@...libre.com>,
	Udit Kumar <u-kumar1@...com>,
	Griffin Kroah-Hartman <griffin@...ah.com>,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Tony Lindgren <tony@...mide.com>
Subject: [PATCH tty-next v5 0/6] convert 8250 to nbcon

This is v5 of a series to convert the 8250 driver to an NBCON
console, providing both threaded and atomic printing
implementations. v4 of this series is here [0]. Additional
background information about NBCON consoles in general is
available in the cover letter of v2 [1].

The changes since v4:

- In wait_for_lsr() use else-condition for fallback timeout.

- In fifo_wait_for_lsr() remove unnecessary return value.

- In serial8250_console_fifo_write() enter/exit unsafe section
  for each character to avoid writing to UART_TX on
  handover/takeover.

- In serial8250_console_byte_write() enter/exit unsafe section
  for each character rather than calling nbcon_can_proceed()
  for each character because nbcon_can_proceed() only checks
  ownership but does not actually handover if within an unsafe
  section. If there is a higher priority waiter, we want to
  handover ASAP so that printing can continue in the higher
  priority context.

- In serial8250_console_write() cleanup the implementation so
  that the procedure is more obvious.

- Add detailed multi-line comment documenting
  uart_8250_port->console_line_ended.

- Add and extend comments as requested.

John Ogness

[0] https://lore.kernel.org/lkml/20241227224523.28131-1-john.ogness@linutronix.de
[1] https://lore.kernel.org/lkml/20240913140538.221708-1-john.ogness@linutronix.de

John Ogness (6):
  serial: 8250: Adjust the timeout for FIFO mode
  serial: 8250: Use frame time to determine timeout
  serial: 8250: Use high-level writing function for FIFO
  serial: 8250: Provide flag for IER toggling for RS485
  serial: 8250: Switch to nbcon console
  serial: 8250: Revert "drop lockdep annotation from
    serial8250_clear_IER()"

 drivers/tty/serial/8250/8250.h            |   4 +-
 drivers/tty/serial/8250/8250_bcm2835aux.c |   4 +-
 drivers/tty/serial/8250/8250_core.c       |  35 ++-
 drivers/tty/serial/8250/8250_omap.c       |   2 +-
 drivers/tty/serial/8250/8250_port.c       | 259 +++++++++++++++++-----
 include/linux/serial_8250.h               |  17 +-
 6 files changed, 254 insertions(+), 67 deletions(-)


base-commit: 2c1fd53af21b8cb13878b054894d33d3383eb1f3
-- 
2.39.5