kernel.git/drivers/tty/serial/imx.c, branch linux-4.7.y

serial: imx: Fix DCD reading

2016-10-22T10:06:46Z

commit 4b75f80003617fe35771a9e27022e8fbd6a41875 upstream. The USR2_DCDIN bit is tested for in register usr1. As the name suggests the usr2 register should be used instead. This fixes reading the Carrier detect status. Signed-off-by: Sascha Hauer Fixes: 90ebc4838666 ("serial: imx: repair and complete handshaking") Acked-by: Uwe Kleine-König Reviewed-by: Fabio Estevam Signed-off-by: Greg Kroah-Hartman

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

2016-04-30T16:26:55Z

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

2016-04-30T16:26:55Z

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

2016-04-30T16:26:55Z

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

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

2016-04-30T16:26:55Z

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

2016-04-30T16:26:55Z

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

2016-04-30T16:26:55Z

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

2016-04-30T16:26:55Z

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

2016-04-30T16:26:55Z

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.

2016-02-07T06:53:43Z

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