linux.git/drivers/tty/serial/of_serial.c, branch v3.16.2

printk/of_serial: fix serial console cessation part way through boot.

2014-05-28T20:07:27+00:00

Commit 5f5c9ae56c38942623f69c3e6dc6ec78e4da2076
"serial_core: Unregister console in uart_remove_one_port()"
fixed a crash where a serial port was removed but
not deregistered as a console.

There is a side effect of that commit for platforms having serial consoles
and of_serial configured (CONFIG_SERIAL_OF_PLATFORM). The serial console
is disabled midway through the boot process.

This cessation of the serial console affects PowerPC computers
such as the MVME5100 and SAM440EP.

The sequence is:

	bootconsole [udbg0] enabled
	....
	serial8250/16550 driver initialises and registers its UARTS,
	one of these is the serial console.
	console [ttyS0] enabled
	....
	of_serial probes "platform" devices, registering them as it goes.
	One of these is the serial console.
	console [ttyS0] disabled.

The disabling of the serial console is due to:

	a.  unregister_console in printk not clearing the
	    CONS_ENABLED bit in the console flags,
	    even though it has announced that the console is disabled; and

	b.  of_platform_serial_probe in of_serial not setting the port type
	    before it registers with serial8250_register_8250_port.

This patch ensures that the serial console is re-enabled when of_serial
registers a serial port that corresponds to the designated console.

Signed-off-by: Stephen Chivers 
Tested-by: Stephen Chivers 
Acked-by: Geert Uytterhoeven  [unregister_console]
Cc: stable  # 3.15

===
The above failure was identified in Linux-3.15-rc2.

Tested using MVME5100 and SAM440EP PowerPC computers with
kernels built from Linux-3.15-rc5 and tty-next.

The continued operation of the serial console is vital for computers
such as the MVME5100 as that Single Board Computer does not
have any grapical/display hardware.
Signed-off-by: Greg Kroah-Hartman

serial: uart: add hw flow control support configuration

2014-05-28T20:04:46+00:00

8250 uart driver currently supports only software assisted hw flow
control. The software assisted hw flow control maintains a hw_stopped
flag in the tty structure to stop and start transmission and use modem
status interrupt for the event to drive the handshake signals. This is
not needed if hw has flow control capabilities. This patch adds a
DT attribute for enabling hw flow control for a uart port. Also skip
stop and start if this flag is present in flag field of the port
structure.

Signed-off-by: Murali Karicheri 
CC: Rob Herring 
CC: Pawel Moll 
CC: Mark Rutland 
CC: Ian Campbell 
CC: Kumar Gala 
CC: Randy Dunlap 
CC: Jiri Slaby 
CC: Santosh Shilimkar 
Signed-off-by: Greg Kroah-Hartman

tty: delete non-required instances of include

2014-01-08T01:05:21+00:00

None of these files are actually using any __init type directives
and hence don't need to include .  Most are just a
left over from __devinit and __cpuinit removal, or simply due to
code getting copied from one driver to the next.

Signed-off-by: Paul Gortmaker 
Signed-off-by: Greg Kroah-Hartman

serial: use platform_{get,set}_drvdata()

2013-06-03T17:21:33+00:00

Use the wrapper functions for getting and setting the driver data using
platform_device instead of using dev_{get,set}_drvdata() with &pdev->dev,
so we can directly pass a struct platform_device.

Also, unnecessary dev_set_drvdata() is removed, because the driver core
clears the driver data to NULL after device_release or on probe failure.

Signed-off-by: Jingoo Han 
Signed-off-by: Greg Kroah-Hartman

serial: of_serial: Handle auto-flow-control property

2013-03-25T23:36:48+00:00

Automatic Flow Control capability is not tied to this
property. This is only one way of detecting it. The property
is limited to be used only with 8250 driver.

Signed-off-by: Heikki Krogerus 
Acked-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

serial: of_serial: Handle fifo-size property

2013-03-25T21:06:44+00:00

This will reduce the need for extra types in 8250.c just
in case the fifo size differs from the standard.

Signed-off-by: Heikki Krogerus 
Acked-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

tty/serial: Add support for Altera serial port

2013-03-12T15:53:23+00:00

Add support for Altera 8250/16550 compatible serial port.

Signed-off-by: Ley Foon Tan 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

tty: of_serial: unexport tegra_serial_handle_break

2013-02-05T19:13:16+00:00

Tegra is only booted through device-tree now; there are no board files
left that use this function. Hence, don't export it. Move the static
inline definition into of_serial.c, so we can delete of_serial.h too.

Signed-off-by: Stephen Warren 
Signed-off-by: Greg Kroah-Hartman

tty: remove use of __devinitdata

2012-11-21T23:25:06+00:00

CONFIG_HOTPLUG is going away as an option so __devinitdata is no
longer needed.

Signed-off-by: Bill Pemberton 
Cc: Alan Cox 
Cc: Peter Korsgaard 
Signed-off-by: Greg Kroah-Hartman

tty: remove use of __devinit

2012-11-21T23:22:52+00:00

CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.

Signed-off-by: Bill Pemberton 
Cc: Jiri Slaby 
Cc: Alan Cox 
Cc: Lucas Tavares 
Cc: "David S. Miller" 
Cc: Peter Korsgaard 
Cc: Tony Prisk 
Acked-by: Tobias Klauser 
Acked-by: Nicolas Ferre 
Signed-off-by: Greg Kroah-Hartman