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linux/drivers/tty
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Philipp Zabel bb60606544 serial: imx: Fix DMA handling for IDLE condition aborts 
commit 392bceedb1 upstream.

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 <ps.report@gmx.net>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2015-06-22 17:01:23 -07:00
..
hvc xen/events: don't bind non-percpu VIRQs with percpu chip 2015-06-06 08:19:32 -07:00
ipwireless tty: Fix low_latency BUG 2014-04-26 17:19:04 -07:00
serial serial: imx: Fix DMA handling for IDLE condition aborts 2015-06-22 17:01:23 -07:00
vt vt: provide notifications on selection changes 2015-03-06 14:43:30 -08:00
amiserial.c tty/amiserial: avoid interruptible_sleep_on 2014-01-07 17:05:21 -08:00
bfin_jtag_comm.c TTY: bfin_jtag_comm: fix incorrect placement of __initdata tag 2013-09-30 19:09:37 -07:00
cyclades.c tty: an overflow of multiplication in drivers/tty/cyclades.c 2013-12-20 12:21:57 -08:00
ehv_bytechan.c drivers: clean-up prom.h implicit includes 2013-10-09 20:04:04 -05:00
goldfish.c tty: delete non-required instances of include <linux/init.h> 2014-01-07 17:05:21 -08:00
isicom.c TTY: switch tty_flip_buffer_push 2013-01-15 22:30:15 -08:00
Kconfig drivers/tty: ehv_bytechan fails to build as a module 2014-01-09 17:52:12 -06:00
Makefile tty: Add timed, writer-prioritized rw semaphore 2013-05-20 12:30:32 -07:00
metag_da.c tree-wide: use reinit_completion instead of INIT_COMPLETION 2013-11-15 09:32:21 +09:00
moxa.c TTY: add tty_port_tty_hangup helper 2013-03-18 16:24:29 -07:00
moxa.h tty: move a number of tty drivers from drivers/char/ to drivers/tty/ 2011-02-22 16:14:56 -08:00
mxser.c tty: mxser: Fix build warning introduced by dfc7b837c7 (Re: linux-next: build warning after merge of the tty.current tree) 2013-05-22 10:26:02 -07:00
mxser.h Fix common misspellings 2011-03-31 11:26:23 -03:00
n_gsm.c tty/n_gsm.c: fix a memory leak when gsmtty is removed 2015-06-06 08:19:35 -07:00
n_hdlc.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
n_r3964.c tty: Always handle NULL flag ptr 2013-12-08 16:56:05 -08:00
n_tracerouter.c n_tracerouter and n_tracesink ldisc additions. 2011-05-13 16:31:00 -07:00
n_tracesink.c n_tracerouter and n_tracesink ldisc additions. 2011-05-13 16:31:00 -07:00
n_tracesink.h n_tracerouter and n_tracesink ldisc additions. 2011-05-13 16:31:00 -07:00
n_tty.c n_tty: Fix auditing support for cannonical mode 2015-06-22 17:01:19 -07:00
nozomi.c tty: Remove unnecessary semicolons 2013-10-16 13:08:16 -07:00
pty.c tty: Prevent untrappable signals from malicious program 2015-03-06 14:43:30 -08:00
rocket.c tty: remove DEFINE_PCI_DEVICE_TABLE macro 2013-12-08 17:09:07 -08:00
rocket.h tty: move a number of tty drivers from drivers/char/ to drivers/tty/ 2011-02-22 16:14:56 -08:00
rocket_int.h tty: move a number of tty drivers from drivers/char/ to drivers/tty/ 2011-02-22 16:14:56 -08:00
synclink.c tty: synclink: avoid sleep_on race 2014-01-07 17:05:21 -08:00
synclink_gt.c tty: synclink: avoid sleep_on race 2014-01-07 17:05:21 -08:00
synclinkmp.c tty: synclink: avoid sleep_on race 2014-01-07 17:05:21 -08:00
sysrq.c sysrq: Allow magic SysRq key functions to be disabled through Kconfig 2013-10-16 13:01:44 -07:00
tty_audit.c audit: convert all sessionid declaration to unsigned int 2014-01-13 22:31:46 -05:00
tty_buffer.c Staging: speakup: Update __speakup_paste_selection() tty (ab)usage to match vt 2014-06-11 11:54:12 -07:00
tty_io.c tty: fix up atime/mtime mess, take four 2015-03-18 13:31:31 +01:00
tty_ioctl.c TTY: fix tty_wait_until_sent on 64-bit machines 2015-03-18 13:31:30 +01:00
tty_ldisc.c tty: delete non-required instances of include <linux/init.h> 2014-01-07 17:05:21 -08:00
tty_ldsem.c tty: Fix hang at ldsem_down_read() 2013-12-16 16:55:43 -08:00
tty_mutex.c tty: tty_mutex.c: Fixed coding style warning (using printk) 2012-10-24 11:34:51 -07:00
tty_port.c tty: delete non-required instances of include <linux/init.h> 2014-01-07 17:05:21 -08:00