linux.git/drivers/tty/serial/imx.c, branch v4.7

serial: imx: Use generic uart-has-rtscts DT property

2016-04-30T16:26:55+00:00

Convert the Freescale IMX UART driver from using the vendor-specific
"fsl,uart-has-rtscts" to the generic "uart-has-rtscts" DT property, as
documented by the Generic Serial DT Bindings.

The old vendor-specific property is still recognized by the driver for
backwards compatibility, but deprecated.

Signed-off-by: Geert Uytterhoeven 
Acked-by: Rob Herring 
Signed-off-by: Greg Kroah-Hartman

serial: imx: implement DSR irq handling for DTE mode

2016-04-30T16:26:55+00:00

Enable reporting of DSR events (which is named DTR in the registers
because Freescale uses the names as seem from a DCE).

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

serial: imx: reorder functions to simplify next patch

2016-04-30T16:26:55+00:00

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

serial: imx: only count 0->1 transitions for RNG

2016-04-30T16:26:55+00:00

According to tty_ioctl(4) (from man-pages 4.04) the rng member only
counts 0->1 transitions. For the other signals (DSR, CD, CTS) both edges
are supposed to be counted.

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

serial: imx: make sure unhandled irqs are disabled

2016-04-30T16:26:55+00:00

Make sure that events that are not handled in the irq function don't
trigger an interrupt.

When the serial port is operated in DTE mode, the events for DCD and RI
events are enabled after a system reset by default.

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

serial: imx: let irq handler return IRQ_NONE if no event was handled

2016-04-30T16:26:55+00:00

This gives the irq core a chance to disable the serial interrupt in case
an event isn't cleared in the handler.

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

serial: imx: fix polarity of RI

2016-04-30T16:26:55+00:00

When in DTE mode, the bit USR2_RIIN is active low. So invert the logic
accordingly.

Fixes: 90ebc4838666 ("serial: imx: repair and complete handshaking")
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

serial: imx: support RS-485 Rx disable on Tx

2016-04-30T16:26:55+00:00

Some RS-232 to RS-485 transceivers require Rx to be disabled on Tx to
avoid echo of Tx data into the Rx buffer. Specifically, the XR3160E
RS-232/RS-485/RS-422 transceiver behaves this way.

This commit disables Rx on active Tx when SER_RS485_ENABLED is active and
SER_RS485_RX_DURING_TX is disabled.

Note that this is a change in behavior of the driver. Until now
SER_RS485_RX_DURING_TX was enabled unconditionally even when disabled in
the TIOCSRS485 ioctl serial_rs485 flags field.

Cc: Uwe Kleine-König 
Signed-off-by: Baruch Siach 
Signed-off-by: Greg Kroah-Hartman

serial: imx: Fix suspend / resume.

2016-02-07T06:53:43+00:00

When a non console i.MX UART is enabled in the device tree,
system suspend fails due to an unprepared clock:

[  638.794563] PM: Syncing filesystems ... done.
[  638.878902] Freezing user space processes ... (elapsed 0.002 seconds) done.
[  638.888454] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[  638.996697] PM: suspend of devices complete after 97.200 msecs
[  639.002611] PM: suspend devices took 0.100 seconds
[  639.013020] PM: late suspend of devices complete after 2.288 msecs
[  639.021486] ------------[ cut here ]------------
[  639.026147] WARNING: CPU: 0 PID: 488 at drivers/clk/clk.c:732 clk_core_enable+0xc0/0x12c()
[  639.034413] Modules linked in:
[  639.037490] CPU: 0 PID: 488 Comm: system_server Tainted: G        W       4.4.0-rc5-pknbsp-svn2214-atag-v4.4-rc5-121-gebfd9cb #1304
[  639.049312] Hardware name: Freescale i.MX53 (Device Tree Support)
[  639.055444] [] (unwind_backtrace) from [] (show_stack+0x20/0x24)
[  639.063199] [] (show_stack) from [] (dump_stack+0x20/0x28)
[  639.070442] [] (dump_stack) from [] (warn_slowpath_common+0x88/0xc0)
[  639.078541] [] (warn_slowpath_common) from [] (warn_slowpath_null+0x2c/0x34)
[  639.087332] [] (warn_slowpath_null) from [] (clk_core_enable+0xc0/0x12c)
[  639.095777] [] (clk_core_enable) from [] (clk_enable+0x2c/0x40)
[  639.103441] [] (clk_enable) from [] (imx_serial_port_suspend_noirq+0x20/0xe0)
[  639.112336] [] (imx_serial_port_suspend_noirq) from [] (dpm_run_callback+0x68/0x16c)
[  639.121825] [] (dpm_run_callback) from [] (__device_suspend_noirq+0xf4/0x22c)
[  639.130705] [] (__device_suspend_noirq) from [] (dpm_suspend_noirq+0x148/0x30c)
[  639.139764] [] (dpm_suspend_noirq) from [] (suspend_devices_and_enter+0x2e8/0x6a4)
[  639.149078] [] (suspend_devices_and_enter) from [] (pm_suspend+0x310/0x4b8)
[  639.157782] [] (pm_suspend) from [] (state_store+0x7c/0xcc)
[  639.165099] [] (state_store) from [] (kobj_attr_store+0x1c/0x28)
[  639.172858] [] (kobj_attr_store) from [] (sysfs_kf_write+0x54/0x58)
[  639.180871] [] (sysfs_kf_write) from [] (kernfs_fop_write+0x100/0x1c8)
[  639.189152] [] (kernfs_fop_write) from [] (__vfs_write+0x3c/0xe8)
[  639.196991] [] (__vfs_write) from [] (vfs_write+0xa4/0x160)
[  639.204307] [] (vfs_write) from [] (SyS_write+0x4c/0x98)
[  639.211363] [] (SyS_write) from [] (ret_fast_syscall+0x0/0x3c)

This does not happen for the common case of a single UART used as a console
(since imx_console_setup() already does a prepare)

Signed-off-by: Martin Fuzzey 
Signed-off-by: Greg Kroah-Hartman

serial: imx: implement handshaking using gpios with the mctrl_gpio helper

2015-12-14T04:01:47+00:00

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman