linux-toradex.git/drivers/tty, branch v3.3.5

drivers/tty/amiserial.c: add missing tty_unlock

2012-04-27T17:16:50+00:00

commit d3a7b83f865b46bb7b5e1ed18a129ce1af349db4 upstream.

tty_unlock is used on all other exits from the function.

Signed-off-by: Julia Lawall 
Acked-by: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman

pch_uart: Fix dma channel unallocated issue

2012-04-27T17:16:50+00:00

commit af6d17cdc8c89aeb3101f0d27cd32fc0592b40b2 upstream.

This driver anticipates pch_uart_verify_port() is not called
during installation.
However, actually pch_uart_verify_port() is called during
installation.
As a result, memory access violation occurs like below.

0. initial value: use_dma=0
1. starup()
    - dma channel is not allocated because use_dma=0
2. pch_uart_verify_port()
    - Set use_dma=1
3. UART processing acts DMA mode because use_dma=1
     - memory access violation occurs!

This patch fixes the issue.

Solution:
Whenever pch_uart_verify_port() is called and then
dma channel is not allocated, the channel should be allocated.

Signed-off-by: Tomoya MORINAGA 
Signed-off-by: Greg Kroah-Hartman

ARM: clps711x: serial driver hungs are a result of call disable_irq within ISR

2012-04-27T17:16:34+00:00

commit 7a6fbc9a887193a1e9f8658703881c528040afbc upstream.

Since 2.6.30-rc1 clps711x serial driver hungs system. This is a result
of call disable_irq from ISR. synchronize_irq waits for end of interrupt
and goes to infinite loop. This patch fix this problem.

Signed-off-by: Alexander Shiyan 
Signed-off-by: Greg Kroah-Hartman

serial: PL011: move interrupt clearing

2012-04-22T22:39:16+00:00

commit c3d8b76f61586714cdc5f219ba45592a54caaa55 upstream.

Commit 360f748b204275229f8398cb2f9f53955db1503b
"serial: PL011: clear pending interrupts"
attempts to clear interrupts by writing to a
yet-unassigned memory address. This fixes the issue.

The breaking patch is marked for stable so should be
carried along with the other patch.

Cc: Shreshtha Kumar Sahu 
Cc: Russell King 
Cc: Nicolas Pitre 
Reported-by: Viresh Kumar 
Signed-off-by: Linus Walleij 
Tested-by: Grant Likely 
Signed-off-by: Greg Kroah-Hartman

serial: PL011: clear pending interrupts

2012-04-22T22:39:16+00:00

commit 9b96fbacda34079dea0638ee1e92c56286f6114a upstream.

Chanho Min reported that when the boot loader transfers
control to the kernel, there may be pending interrupts
causing the UART to lock up in an eternal loop trying to
pick tokens from the FIFO (since the RX interrupt flag
indicates there are tokens) while in practice there are
no tokens - in fact there is only a pending IRQ flag.

This patch address the issue with a combination of two
patches suggested by Russell King that clears and mask
all interrupts at probe() and clears any pending error
and RX interrupts at port startup time.

We suspect the spurious interrupts are a side-effect of
switching the UART from FIFO to non-FIFO mode.

Cc: Shreshtha Kumar Sahu 
Reported-by: Chanho Min 
Suggested-by: Russell King 
Signed-off-by: Linus Walleij 
Reviewed-by: Jong-Sung Kim 
Signed-off-by: Greg Kroah-Hartman

pch_uart: Fix MSI setting issue

2012-04-22T22:38:59+00:00

commit 867c902e07d5677e2a5b54c0435e589513abde48 upstream.

The following patch (MSI setting) is not enough.

commit e463595fd9c752fa4bf06b47df93ef9ade3c7cf0
Author: Alexander Stein 
Date:   Mon Jul 4 08:58:31 2011 +0200

    pch_uart: Add MSI support

    Signed-off-by: Alexander Stein 
    Signed-off-by: Greg Kroah-Hartman 

To enable MSI mode, PCI bus-mastering must be enabled.
This patch enables the setting.

cc: Alexander Stein 
Signed-off-by: Tomoya MORINAGA 
Signed-off-by: Greg Kroah-Hartman

tty: serial: altera_uart: Check for NULL platform_data in probe.

2012-04-22T22:38:57+00:00

commit acede70d6561f2d042d9dbb153d9a3469479c0ed upstream.

Follow altera_jtag_uart.  This fixes a crash if there is a mistake in the DTS.

Signed-off-by: Yuriy Kozlov 
Signed-off-by: Tobias Klauser 
Signed-off-by: Greg Kroah-Hartman

serial/8250_pci: add a "force background timer" flag and use it for the "kt" serial port

2012-04-22T22:38:57+00:00

commit bc02d15a3452fdf9276e8fb89c5e504a88df888a upstream.

Workaround dropped notifications in the iir register.  Register reads
coincident with new interrupt notifications sometimes result in this
device clearing the interrupt event without reporting it in the read
data.

The serial core already has a heuristic for determining when a device
has an untrustworthy iir register.  In this case when we apriori know
that the iir is faulty use a flag (UPF_BUG_THRE) to bypass the test and
force usage of the background timer.

Acked-by: Alan Cox 
Reported-by: Nhan H Mai 
Reported-by: Sudhakar Mamillapalli 
Tested-by: Nhan H Mai 
Tested-by: Sudhakar Mamillapalli 
Signed-off-by: Dan Williams 
Signed-off-by: Greg Kroah-Hartman

Revert "serial/8250_pci: setup-quirk workaround for the kt serial controller"

2012-04-22T22:38:57+00:00

commit 49b532f96fda23663f8be35593d1c1372c0f91e0 upstream.

This reverts commit 448ac154c957c4580531fa0c8f2045816fe2f0e7.

The semantic of UPF_IIR_ONCE is only guaranteed to workaround the race
condition in the kt serial's iir register if the only source of
interrupts is THRE (fifo-empty) events.  An modem status event at the
wrong time can again cause an iir read to drop the 'empty' status
leading to a hang.  So, revert this in preparation for using the
existing "I don't trust my iir register" workaround in the 8250 core
(UART_BUG_THRE).

Acked-by: Alan Cox 
Cc: Sudhakar Mamillapalli 
Reported-by: Nhan H Mai 
Signed-off-by: Dan Williams 
Signed-off-by: Greg Kroah-Hartman

serial: samsung: fix omission initialize ulcon in reset port fn()

2012-04-22T22:38:57+00:00

commit 7b246a1d0dfe75346a22bf6589b858a0389e6df1 upstream.

Fix omission initialize ulcon in s3c24xx_serial_resetport(),
reset port function in drivers/tty/serial/samsung.c. It has
been happened from commit 0dfb3b41("serial: samsung: merge
all SoC specific port reset functions")

Signed-off-by: Kukjin Kim 
Signed-off-by: Greg Kroah-Hartman