linux-stable.git/drivers/serial, branch linux-2.6.31.y

serial: 8250: add serial transmitter fully empty test

2010-04-01T22:55:53+00:00

commit bca476139d2ded86be146dae09b06e22548b67f3 upstream.

When controlling an industrial radio modem it can be necessary to
manipulate the handshake lines in order to control the radio modem's
transmitter, from userspace.

The transmitter should not be turned off before all characters have been
transmitted.  serial8250_tx_empty() was reporting that all characters were
transmitted before they actually were.

===

Discovered in parallel with more testing and analysis by Kees Schoenmakers
as follows:

I ran into an NetMos 9835 serial pci board which behaves a little
different than the standard.  This type of expansion board is very common.

"Standard" 8250 compatible devices clear the 'UART_LST_TEMT" bit together
with the "UART_LSR_THRE" bit when writing data to the device.

The NetMos device does it slightly different

I believe that the TEMT bit is coupled to the shift register.  The problem
is that after writing data to the device and very quickly after that one
does call serial8250_tx_empty, it returns the wrong information.

My patch makes the test more robust (and solves the problem) and it does
not affect the already correct devices.

Alan:

  We may yet need to quirk this but now we know which chips we have a
  way to do that should we find this breaks some other 8250 clone with
  dodgy THRE.

Signed-off-by: Dick Hollenbeck 
Signed-off-by: Alan Cox 
Cc: Kees Schoenmakers 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_pnp: use wildcard for serial Wacom tablets

2010-04-01T22:55:35+00:00

commit 6d34855d9aa281f72c533ecb827405139d1b0fe9 upstream.

Wacom claims that the WACF namespace will always be devoted to serial
Wacom tablets.  Remove the existing entries and add a wildcard to avoid
having to update the kernel every time they add a new device.

Signed-off-by: Ping Cheng 
Signed-off-by: Matthew Garrett 
Tested-by: Ping Cheng 
Cc: Alan Cox 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

sunsu: Use sunserial_console_termios() in sunsu_console_setup().

2009-12-18T21:44:06+00:00

[ Upstream commit be24656a5e2d68bfd0744f0742c4aceef2cf44b5 ]

Be like the other Sun serial drivers otherwise the special handling of
OpenFirmware options and hard-coded overrides for LOM/RSC consoles
will not be handled.

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sunsu: Pass true 'ignore_line' to console match when RSC or LOM console.

2009-12-18T21:44:05+00:00

[ Upstream commit 1917d17b903955b8b2903626a2e01d071a5d0ec9 ]

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().

2009-12-18T21:44:01+00:00

[ Upstream commit 457931de3b0925dc2eb941bc7d611a509be36dff ]

RSC and LOM devices have fixed speed settings.

We already had some code to match and handle "rsc" named devices on
E250 systems, but we also have to handle 'rsc-console', 'rsc-control',
and 'lom-console'.

Also, in order to get this right regardless of what 'output-device'
happens to be, explicitly pass the UART device node pointer to this
routine.

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

serial: suncore: Add 'ignore_line' argument to sunserial_console_match().

2009-12-18T21:44:00+00:00

[ Upstream commit 4e3533d05b6e5e66d1cda27f6671251c99c62894 ]

This tells the logic to ignore the line match when deciding whether the
device is the OpenFirmware specified console device or not.

This is going to be used in the SU driver for rsc-console detection.

There is probably a better way to handle this, but this is the least
intrusive solution for now which we can validate won't break any other
cases.

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sunsu: Fix detection of SU ports which are RSC console or control.

2009-12-18T21:44:00+00:00

[ Upstream commit 8301d386afc55c877bafe2c6c7dc75a96ddd2838 ]

These device nodes are named "rsc-console" and "rsc-control" rather
than 'serial', but the device_type property is 'serial' so we'll
tip off of that for detection.

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sunsab: Do not set sunsab_reg.cons right before registering minors.

2009-12-18T21:43:59+00:00

[ Upstream commit 4e68e188411ea98e40309700cf0c89ad4469ac1d ]

Other Sun serial drivers do not do this, and if we keep it this way
it ends up registering all serial devices as consoles rather than
just the one which we explicitly register via sunserial_console_match()
which uses add_preferred_console().

Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

Serial: Do not read IIR in serial8250_start_tx when UART_BUG_TXEN

2009-12-18T21:43:48+00:00

commit 68cb4f8e246bbbc649980be0628cae9265870a91 upstream.

Do not read IIR in serial8250_start_tx when UART_BUG_TXEN

Reading the IIR clears some oustanding interrupts so it is not safe.
Instead, simply transmit immediately if the buffer is empty without
regard to IIR.

Signed-off-by: Ian Jackson 
Reviewed-by: Markus Armbruster 
Reviewed-by: Jiri Kosina 
Cc: Alan Cox 
Signed-off-by: Greg Kroah-Hartman

tty/of_serial: add missing ns16550a id

2009-12-08T18:22:43+00:00

commit 16173c7c2d79da7eb89b41acfdebd74b130f4339 upstream.

Many boards have a bug-free ns16550 compatible serial port, which we should
register as PORT_16550A. This introduces a new value "ns16550a" for the
compatible property of of_serial to let a firmware choose that model instead
of using the crippled PORT_16550 mode.

Reported-by: Alon Ziv 
Signed-off-by: Michal Simek 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman