kernel/drivers/tty/serial/imx.c, branch linux-4.1.y

Revert "serial: imx: initialized DMA w/o HW flow enabled"

2015-08-10T19:21:56Z

commit 907eda32a36fcdb979bdb91ea097abb3dd2c23c9 upstream. This reverts commit 068500e08dc87ea9a453cc4a500cf3ab28d0f936. According to some tests, SDMA support is broken at least for i.MX6 without HW flow control. Different forms of data-corruption appear either with the ROM firmware for the SDMA controller as well as when loading Freescale provided SDMA firmware versions 1.1 or 3.1. Signed-off-by: David Jander Signed-off-by: Greg Kroah-Hartman

serial: imx: Fix DMA handling for IDLE condition aborts

2015-05-24T19:43:29Z

The driver configures the IDLE condition to interrupt the SDMA engine. Since the SDMA UART ROM script doesn't clear the IDLE bit itself, this caused repeated 1-byte DMA transfers, regardless of available data in the RX FIFO. Also, when returning due to the IDLE condition, the UART ROM script already increased its counter, causing residue to be off by one. This patch clears the IDLE condition to avoid repeated 1-byte DMA transfers and decreases count by when the DMA transfer was aborted due to the IDLE condition, fixing serial transfers using DMA on i.MX6Q. Reported-by: Peter Seiderer Signed-off-by: Philipp Zabel Tested-by: Fabio Estevam Cc: stable Signed-off-by: Greg Kroah-Hartman

serial: imx: Add braces to avoid ambiguous 'else'

2015-03-11T12:55:20Z

Commit 17b8f2a3fdca29 ("serial: imx: add support for half duplex rs485") introduced the following build warning: drivers/tty/serial/imx.c: In function 'imx_set_termios': drivers/tty/serial/imx.c:1301:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] Add the suggested braces to avoid the build warning. Signed-off-by: Fabio Estevam Acked-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman

serial: imx: add support for half duplex rs485

2015-03-07T02:26:33Z

The transmitter is expected to be controlled by the UART's RTS pin. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman

serial: imx: drop support for IRDA

2015-03-07T02:26:32Z

Support for IRDA was added in 2009 in commit v2.6.31-rc1~399^2~2. There are no in-tree users. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman

serial: imx: fix comment about which machines use the i.MX21 type

2015-03-07T02:26:32Z

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

serial: imx: reformat and cleanup copyright header

2015-03-07T02:26:32Z

Fix indention, remove old address of the FSF, remove in-file changelog, mention Freescale. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman

serial: imx: drop members from driver data that are only used during probe

2015-03-07T02:26:32Z

There is no benefit in keeping this information in RAM when it's not used any more, so better use function local variables instead. These members are unused since c0d1c6b0f0dc ("serial: imx: Fix the reporting of interrupts") Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman

serial: imx: remove long dead code

2015-03-07T02:26:32Z

This if (0) exists since the driver was introduced in commit c49bde83eb6a ([ARM PATCH] 1956/2: Re: Motorola i.MX serial driver) back in 2004. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman

serial: imx: Fix clearing of receiver overrun flag

2015-03-07T02:26:32Z

The writeable bits in the USR2 register are all "write 1 to clear" so only write the bits that actually should be cleared. Fixes: f1f836e4209e ("serial: imx: Add Rx Fifo overrun error message") Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman