linux.git/drivers/tty/serial/8250, branch v4.16

serial: 8250_pci: Add Brainboxes UC-260 4 port serial device

2018-02-28T12:48:21+00:00

Add PCI ids for two variants of Brainboxes UC-260 quad port
PCI serial cards.

Suggested-by: Andy Shevchenko 
Signed-off-by: Nikola Ciprich 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_pci: Don't fail on multiport card class

2018-02-28T12:48:21+00:00

Do not fail on multiport cards in serial_pci_is_class_communication().

It restores behaviour for SUNIX multiport cards, that enumerated by
class and have a custom board data.

Moreover it allows users to reenumerate port-by-port from user space.

Fixes: 7d8905d06405 ("serial: 8250_pci: Enable device after we check black list")
Reported-by: Nikola Ciprich 
Signed-off-by: Andy Shevchenko 
Tested-by: Nikola Ciprich 
Signed-off-by: Greg Kroah-Hartman

tty: serial: exar: Relocate sleep wake-up handling

2018-01-25T11:44:50+00:00

Exar sleep wake-up handling has been done on a per-channel basis by
virtue of INT0 being accessible from each channel's address space. I
believe this was initially done out of necessity, but now that Exar
devices have their own driver, we can do things more efficiently by
registering a dedicated INT0 handler at the PCI device level.

I see this change providing the following benefits:

    1. If more than one port is active, eliminates the redundant bus
       cycles for reading INT0 on every interrupt.
    2. This note associated with hooking in the per-channel handler in
       8250_port.c is resolved:
        /* Fixme: probably not the best place for this */

Cc: Matt Schulte 
Signed-off-by: Aaron Sierra 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_dw: Revert "Improve clock rate setting"

2018-01-22T13:13:40+00:00

The commit

  de9e33bdfa22 ("serial: 8250_dw: Improve clock rate setting")

obviously tries to cure symptoms, and not a root cause.

The root cause is the non-flexible rate calculation inside the
corresponding clock driver. What we need is to provide maximum UART
divisor value to the clock driver to allow it do the job transparently
to the caller.

Since from the initial commit message I have got no clue which clock
driver actually needs to be amended, I leave this exercise to the people
who know better the case.

Moreover, it seems [1] the fix introduced a regression. And possible
even one more [2].

Taking above, revert the commit de9e33bdfa22 for now.

[1]: https://www.spinics.net/lists/linux-serial/msg28872.html
[2]: https://github.com/Dunedan/mbp-2016-linux/issues/29#issuecomment-357583782

Fixes: de9e33bdfa22 ("serial: 8250_dw: Improve clock rate setting")
Cc: stable  # 4.15
Cc: Ed Blake 
Cc: Heikki Krogerus 
Cc: Lukas Wunner 
Signed-off-by: Andy Shevchenko 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_ingenic: Parse earlycon options

2018-01-09T15:49:14+00:00

In the devicetree, it is possible to specify the baudrate, parity,
bits, flow of the early console, by passing a configuration string like
this:

aliases {
	serial0 = &uart0;
};

chosen {
	stdout-path = "serial0:57600n8";
};

This, for instance, will configure the early console for a baudrate of
57600 bps, no parity, and 8 bits per baud.

This patches implements parsing of this configuration string in the
8250_ingenic driver, which previously just ignored it.

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

serial: 8250_ingenic: Add support for the JZ4770 SoC

2018-01-09T15:49:14+00:00

The JZ4770 SoC's UART is no different from the other JZ SoCs, so this
commit simply adds the ingenic,jz4770-uart compatible string.

Signed-off-by: Paul Cercueil 
Acked-by: Rob Herring 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_of: fix return code when probe function fails to get reset

2018-01-09T15:46:26+00:00

The error pointer from devm_reset_control_get_optional_shared() is
not propagated.

One of the most common problem scenarios is it returns -EPROBE_DEFER
when the reset controller has not probed yet.  In this case, the
probe of the reset consumer should be deferred.

Fixes: e2860e1f62f2 ("serial: 8250_of: Add reset support")
Cc: stable@vger.kernel.org # v4.13+
Signed-off-by: Masahiro Yamada 
Reviewed-by: Philipp Zabel 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_uniphier: fix error return code in uniphier_uart_probe()

2018-01-09T15:45:17+00:00

Fix to return a negative error code from the port register error
handling case instead of 0, as done elsewhere in this function.

Fixes: 39be40ce066d ("serial: 8250_uniphier: fix serial port index in private data")
Signed-off-by: Wei Yongjun 
Acked-by: Masahiro Yamada 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

serial: 8250: 8250_omap: Fix spelling error.

2017-12-15T19:27:44+00:00

Fixed a spelling error in a comment.

Signed-off-by: Rolf Evers-Fischer 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_dw: Disable clock on error

2017-12-15T19:27:43+00:00

If there is no clock rate for uartclk defined, disable the previously
enabled clock again.

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 23f5b3fdd04e serial: 8250_dw: only get the clock rate in one place
Signed-off-by: Stefan Potyra 
Signed-off-by: Greg Kroah-Hartman