linux/drivers/tty/serial, branch v4.11

tty: pl011: fix earlycon work-around for QDF2400 erratum 44

2017-04-01T09:07:29Z

The work-around for the Qualcomm Datacenter Technologies QDF2400 erratum 44 sets the "qdf2400_e44_present" global variable if the work-around is needed. However, this check does not happen until after earlycon is initialized, which means the work-around is not used, and the console hangs as soon as it displays one character. Fixes: d8a4995bcea1 ("tty: pl011: Work around QDF2400 E44 stuck BUSY bit") Signed-off-by: Timur Tabi Signed-off-by: Greg Kroah-Hartman

serial: 8250_EXAR: fix duplicate Kconfig text and add missing help text

2017-03-31T15:26:20Z

In commit d0aeaa83f0b0f7a92615bbdd6b1f96812f7dcfd2 ("serial: exar: split out the exar code from 8250_pci") the exar driver got its own Kconfig. However the text for the new option was never changed from the original 8250_PCI text, and hence it appears confusing when you get asked the same question twice: 8250/16550 PCI device support (SERIAL_8250_PCI) [Y/n/m/?] (NEW) 8250/16550 PCI device support (SERIAL_8250_EXAR) [Y/n/m] (NEW) Adding to the confusion, is that there is no help text for this new option to indicate it is specific to a certain family of cards. Fix both issues at the same time, as well as the space vs. tab issues introduced in the same commit. Fixes: d0aeaa83f0b0 ("serial: exar: split out the exar code from 8250_pci") Cc: Jiri Slaby Cc: linux-serial@vger.kernel.org Signed-off-by: Paul Gortmaker Acked-by: Sudip Mukherjee Reviewed-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman

tty/serial: atmel: fix TX path in atmel_console_write()

2017-03-31T15:26:20Z

A side effect of 89d8232411a8 ("tty/serial: atmel_serial: BUG: stop DMA from transmitting in stop_tx") is that the console can be called with TX path disabled. Then the system would hang trying to push charecters out in atmel_console_putchar(). Signed-off-by: Nicolas Ferre Fixes: 89d8232411a8 ("tty/serial: atmel_serial: BUG: stop DMA from transmitting in stop_tx") Cc: stable #4.4+ Acked-by: Richard Genoud Signed-off-by: Greg Kroah-Hartman

tty/serial: atmel: fix race condition (TX+DMA)

2017-03-31T15:26:19Z

If uart_flush_buffer() is called between atmel_tx_dma() and atmel_complete_tx_dma(), the circular buffer has been cleared, but not atmel_port->tx_len. That leads to a circular buffer overflow (dumping (UART_XMIT_SIZE - atmel_port->tx_len) bytes). Tested-by: Nicolas Ferre Signed-off-by: Richard Genoud Cc: stable # 3.12+ Signed-off-by: Greg Kroah-Hartman

serial: mxs-auart: Fix baudrate calculation

2017-03-31T15:26:19Z

The reference manual for the i.MX28 recommends to calculate the divisor as divisor = (UARTCLK * 32) / baud rate, rounded to the nearest integer , so let's do this. For a typical setup of UARTCLK = 24 MHz and baud rate = 115200 this changes the divisor from 6666 to 6667 and so the actual baud rate improves from 115211.521 Bd (error ≅ 0.01 %) to 115194.240 Bd (error ≅ 0.005 %). Signed-off-by: Uwe Kleine-König Cc: stable Signed-off-by: Greg Kroah-Hartman

Merge tag 'tty-4.11-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

2017-03-26T18:03:42Z

Pull tty/serial driver fixes from Greg KH: "Here are some tty and serial driver fixes for 4.11-rc4. One of these fix a long-standing issue in the ldisc code that was found by Dmitry Vyukov with his great fuzzing work. The other fixes resolve other reported issues, and there is one revert of a patch in 4.11-rc1 that wasn't correct. All of these have been in linux-next for a while with no reported issues" * tag 'tty-4.11-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: tty: fix data race in tty_ldisc_ref_wait() tty: don't panic on OOM in tty_set_ldisc() Revert "tty: serial: pl011: add ttyAMA for matching pl011 console" tty: acpi/spcr: QDF2400 E44 checks for wrong OEM revision serial: 8250_dw: Fix breakage when HAVE_CLK=n serial: 8250_dw: Honor clk_round_rate errors in dw8250_set_termios

Merge tag 'gpio-v4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

2017-03-21T20:01:53Z

Pull GPIO fixes from Linus Walleij: "Here is the first set of GPIO fixes for 4.11. It was delayed a bit beacuse I was chicken when linux-next was not rotating last week. This hits the ST serial driver in drivers/tty/serial and that has an ACK from Greg, he suggested to keep the old GPIO fwnode API around to smoothen things in the merge Windod and those have now served their purpose so we take them out and convert the last driver to the new API. Apart from that it's fixes as usual. Summary: - set the parent on the Altera A10SR driver, also fix high level IRQs. - fix error path on the mockup driver. - compilation noise about unused functions fixed. - fix missed interrupts on the MCP23S08 expander, this is also tagged for stable. - retire the interrim helpers devm_get_gpiod_from_child() used to smoothen merging in the merge window" * tag 'gpio-v4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: gpio:mcp23s08 Fixed missing interrupts serial: st-asc: Use new GPIOD API to obtain RTS pin gpio: altera: Use handle_level_irq when configured as a level_high gpio: xgene: mark PM functions as __maybe_unused gpio: mockup: return -EFAULT if copy_from_user() fails gpio: altera-a10sr: Set gpio_chip parent property

Revert "tty: serial: pl011: add ttyAMA for matching pl011 console"

2017-03-17T05:04:06Z

The original patch makes the condition always true, so it is wrong. It masks (but not fixes) the bug described in the commit message but introduces a regression (no console is selected by SPCR) in regular (no 'console=ttyAMA') case. s/||/&&/ would not fix the problem as the root cause was identified incorrectly. This reverts commit aea9a80ba98a0c9b4de88850260e9fbdcc98360b. Signed-off-by: Aleksey Makarov Signed-off-by: Greg Kroah-Hartman Acked-by: Sudeep Holla Tested-by: Jayachandran C Signed-off-by: Greg Kroah-Hartman

serial: st-asc: Use new GPIOD API to obtain RTS pin

2017-03-14T09:36:41Z

The commits mentioned below adapt the GPIO API to allow more information to be passed directly through devm_get_gpiod_from_child() in the first instance. This facilitates the removal of subsequent calls, such as gpiod_direction_output(). This patch firstly moves to utilise the new API and secondly removes the now superfluous call do set the direction. Reported-by: Stephen Rothwell Suggested-by: Boris Brezillon Signed-off-by: Lee Jones [Also drop the header file dummies that only this driver was using] Acked-by: Greg Kroah-Hartman Signed-off-by: Linus Walleij

serial: 8250_dw: Fix breakage when HAVE_CLK=n

2017-03-14T02:48:11Z

Commit 6a171b299379 ("serial: 8250_dw: Allow hardware flow control to be used") recently broke the 8250_dw driver on platforms which don't select HAVE_CLK, as dw8250_set_termios() gets confused by the behaviour of the fallback HAVE_CLK=n clock API in linux/clk.h which pretends everything is fine but returns (valid) NULL clocks and 0 HZ clock rates. That 0 rate is written into the uartclk resulting in a crash at boot, e.g. on Cavium Octeon III based UTM-8 we get something like this: 1180000000800.serial: ttyS0 at MMIO 0x1180000000800 (irq = 41, base_baud = 25000000) is a OCTEON ------------[ cut here ]------------ WARNING: CPU: 2 PID: 1 at drivers/tty/serial/serial_core.c:441 uart_get_baud_rate+0xfc/0x1f0 ... Call Trace: ... [] uart_get_baud_rate+0xfc/0x1f0 [] serial8250_do_set_termios+0xb0/0x440 [] uart_set_options+0xe8/0x190 [] serial8250_console_setup+0x84/0x158 [] univ8250_console_setup+0x54/0x70 [] register_console+0x1c8/0x418 [] uart_add_one_port+0x434/0x4b0 [] serial8250_register_8250_port+0x2d8/0x440 [] dw8250_probe+0x388/0x5e8 ... The clock API is defined such that NULL is a valid clock handle so it wouldn't be right to check explicitly for NULL. Instead treat a clk_round_rate() return value of 0 as an error which prevents uartclk being overwritten. Fixes: 6a171b299379 ("serial: 8250_dw: Allow hardware flow control to be used") Signed-off-by: James Hogan Cc: Kefeng Wang Cc: David Daney Cc: Russell King Cc: linux-serial@vger.kernel.org Cc: linux-clk@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: bcm-kernel-feedback-list@broadcom.com Reviewed-by: Andy Shevchenko Reviewed-by: Jason Uy Reviewed-by: Heiko Stuebner Signed-off-by: Greg Kroah-Hartman