linux-stable.git/drivers/serial, branch linux-2.6.32.y

serial: samsung: wait for transfer completion before clock disable

2015-05-24T08:10:39+00:00

This patch adds waiting until transmit buffer and shifter will be empty
before clock disabling.

Without this fix it's possible to have clock disabled while data was
not transmited yet, which causes unproper state of TX line and problems
in following data transfers.

Cc: stable@vger.kernel.org
Signed-off-by: Robert Baldyga 
Signed-off-by: Greg Kroah-Hartman 
(cherry picked from commit 1ff383a4c3eda8893ec61b02831826e1b1f46b41)
Signed-off-by: Willy Tarreau

serial: 8250, increase PASS_LIMIT

2013-06-10T09:42:41+00:00

With virtual machines like qemu, it's pretty common to see "too much
work for irq4" messages nowadays. This happens when a bunch of output
is printed on the emulated serial console. This is caused by too low
PASS_LIMIT. When ISR loops more than the limit, it spits the message.

I've been using a kernel with doubled the limit and I couldn't see no
problems. Maybe it's time to get rid of the message now?

[2.6.32: background info from Ram Gupta]

> I need a patch for serial driver that increases PASS_LIMIT merged in
> 3.1. I am using 2.6.32 kernel which experiences kernel panic
> occasionally. It will be great if you can backport to 2.6.32 and 3.0
> kernel. The commit ID is e7328ae1  serial: 8250, increase PASS_LIMIT

Signed-off-by: Jiri Slaby 
Cc: Alan Cox 
Signed-off-by: Greg Kroah-Hartman 
(cherry picked from commit e7328ae1848966181a7ac47e8ae6cddbd2cf55f3)
Cc: Ram Gupta 
Signed-off-by: Willy Tarreau

tty: icount changeover for other main devices

2011-11-26T17:10:38+00:00

commit 0587102cf9f427c185bfdeb2cef41e13ee0264b1 upstream

Again basically cut and paste

Convert the main driver set to use the hooks for GICOUNT

Signed-off-by: Alan Cox 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Dan Carpenter

tty: Make tiocgicount a handler

2011-11-26T17:10:38+00:00

commit d281da7ff6f70efca0553c288bb883e8605b3862 upstream

Dan Rosenberg noted that various drivers return the struct with uncleared
fields. Instead of spending forever trying to stomp all the drivers that
get it wrong (and every new driver) do the job in one place.

This first patch adds the needed operations and hooks them up, including
the needed USB midlayer and serial core plumbing.

Signed-off-by: Alan Cox 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Dan Carpenter

serial/imx: read cts state only after acking cts change irq

2011-05-09T22:54:48+00:00

commit 5680e94148a86e8c31fdc5cb0ea0d5c6810c05b0 upstream.

If cts changes between reading the level at the cts input (USR1_RTSS)
and acking the irq (USR1_RTSD) the last edge doesn't generate an irq and
uart_handle_cts_change is called with a outdated value for cts.

The race was introduced by commit

	ceca629 ([ARM] 2971/1: i.MX uart handle rts irq)

Reported-by: Arwed Springer 
Tested-by: Arwed Springer 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

serial: unbreak billionton CF card

2011-02-17T23:37:03+00:00

commit d0694e2aeb815042aa0f3e5036728b3db4446f1d upstream.

Unbreak Billionton CF bluetooth card. This actually fixes a regression
on zaurus.

Signed-off-by: Pavel Machek 
Signed-off-by: Greg Kroah-Hartman

serial: cpm_uart: implement the cpm_uart_early_write() function for console poll

2010-08-02T17:20:52+00:00

commit 8cd774ad30c22b9d89823f1f05d845f4cdaba9e8 upstream.

The cpm_uart_early_write() function which was used for console poll
isn't implemented in the cpm uart driver.

Implementing this function both fixes the build when CONFIG_CONSOLE_POLL
is set and allows kgdboc to work via the cpm uart.

Signed-off-by: Dongdong Deng 
Reviewed-by: Bruce Ashfield 
Signed-off-by: Greg Kroah-Hartman

serial: imx.c: fix CTS trigger level lower to avoid lost chars

2010-05-26T21:29:16+00:00

commit 1c5250d6163dac28be3afabdfb6c723f107051b7 upstream.

The imx CTS trigger level is left at its reset value that is 32
chars. Since the RX FIFO has 32 entries, when CTS is raised, the
FIFO already is full. However, some serial port devices first empty
their TX FIFO before stopping when CTS is raised, resulting in lost
chars.

This patch sets the trigger level lower so that other chars arrive
after CTS is raised, there is still room for 16 of them.

Signed-off-by: Valentin Longchamp
Tested-by: Philippe Rétornaz
Acked-by: Wolfram Sang
Signed-off-by: Greg Kroah-Hartman

serial: 8250_pnp - add Fujitsu Wacom device

2010-05-12T21:57:05+00:00

commit d9901660b53b92f0f3551c06588b8be38224b245 upstream.

Add Fujitsu Wacom 1FGT Tablet PC device

Signed-off-by: Ping Cheng 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

serial: imx: fix NULL dereference Oops when pdata == NULL

2010-03-15T15:49:54+00:00

commit bbcd18d1b37413d25eaf4580682b1b8e4a09ff5e upstream.

The platform code doesn't have to provide platform data to get sensible
default behaviour from the imx serial driver.

This patch does not handle NULL dereference in the IrDA case, which still
requires a valid platform data pointer (in imx_startup()/imx_shutdown()),
since I don't know whether there is a sensible default behaviour, or
should the operation just fail cleanly.

Signed-off-by: Baruch Siach 
Cc: Baruch Siach 
Cc: Alan Cox 
Cc: Sascha Hauer 
Cc: Oskar Schirmer 
Cc: Fabian Godehardt 
Cc: Daniel Glöckner 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman