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57c3686842
linux/drivers/tty/serial
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Siftar, Gabe 57c3686842 tty/serial: atmel_serial: fix RS485 half-duplex problem 
On our custom board, we are using RS485 in half-duplex mode on an AT91SAM9G45.
SER_RS485_RX_DURING_TX is not set as we do not want to receive the data we
transmit (our transceiver will receive transmitted data).
Although the current driver attempts to disable and enable the receiver at the
appropriate points, incoming data is still loaded into the receive register
causing our code to receive the very last byte that was sent once the receiver
is enabled.

I ran this by Atmel support and they wrote: "The issue comes from the fact
that you disable the PDC/DMA Reception and not the USART Reception channel. In
your case, the[n] you will still receive data into the USART_RHR register, and
maybe you [h]ave the overrun flag set. So please disable the USART reception
channel."

The following patch should force the driver to enable/disable the receiver via
RXEN/RXDIS fields of the USART control register. It fixed the issue I was
having.

Signed-off-by: Gabe Siftar <gabe.siftar@getingeusa.com>
[nicolas.ferre@atmel.com: slightly modify commit message]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-09 10:30:39 -07:00
..
8250 Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
cpm_uart TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
jsm jsm: Fixed EEH recovery error 2012-01-24 12:55:36 -08:00
21285.c Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
68328serial.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
68328serial.h TTY: serial, remove dead code from 68328 2011-09-22 15:47:54 -07:00
altera_jtaguart.c Merge branch 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6 2011-10-27 08:35:41 +02:00
altera_uart.c tty: serial: altera_uart: Check for NULL platform_data in probe. 2012-04-09 10:30:39 -07:00
amba-pl010.c serial: pl010: Enable module alias autogeneration for AMBA drivers 2011-11-22 10:58:32 +00:00
amba-pl011.c serial: PL011: move interrupt clearing 2012-04-06 14:04:33 -07:00
apbuart.c apbuart: fix section mismatch warning 2011-12-27 16:33:13 -05:00
apbuart.h
ar933x_uart.c SERIAL: AR933X: Add driver for the built-in UART of the SoC 2011-12-07 22:02:46 +00:00
atmel_serial.c tty/serial: atmel_serial: fix RS485 half-duplex problem 2012-04-09 10:30:39 -07:00
bcm63xx_uart.c serial: bcm63xx_uart: fix irq storm after rx fifo overrun. 2011-06-16 12:01:58 -07:00
bfin_sport_uart.c serial: bfin-sport-uart: Add tty ASYNC_CTS_FLOW flag to do CTS flow control. 2011-12-09 19:05:33 -08:00
bfin_sport_uart.h tty: bfin-sport-uart: Rx interrupt is not called always with irq disabled. 2011-12-09 19:05:33 -08:00
bfin_uart.c serial: bfin-uart: Don't access tty circular buffer in TX DMA interrupt after it is reset. 2012-03-13 14:33:39 -07:00
clps711x.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
crisv10.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
crisv10.h
dz.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
dz.h
efm32-uart.c serial/efm32: add new driver 2012-01-26 11:29:47 -08:00
icom.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
icom.h
ifx6x60.c TTY: remove re-assignments to tty_driver members 2012-03-08 11:37:58 -08:00
ifx6x60.h
imx.c serial: imx: add clk_prepare/clk_unprepare 2012-02-01 14:29:31 +01:00
ioc3_serial.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
ioc4_serial.c TTY: remove serialP.h inclusion from some files 2012-03-08 11:47:02 -08:00
ip22zilog.c Fix common misspellings 2011-03-31 11:26:23 -03:00
ip22zilog.h
Kconfig Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
kgdboc.c tty: Add module.h to drivers/tty users who just expect it there. 2011-10-31 19:31:27 -04:00
lantiq.c Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty 2011-10-26 15:11:09 +02:00
m32r_sio_reg.h m32r: relocate drivers back out of 8250 dir 2012-02-08 15:04:32 -08:00
m32r_sio.c TTY: remove serialP.h inclusion from some files 2012-03-08 11:47:02 -08:00
m32r_sio.h TTY: serial, include pci.h in m32r_sio 2012-03-08 11:47:02 -08:00
Makefile Merge tag 'tty-3.3-rc3' tty-next 2012-02-10 10:25:27 -08:00
max3100.c TTY: Remove redundant spi driver bus initialization 2011-11-26 20:19:21 -08:00
max3107.c TTY: Remove redundant spi driver bus initialization 2011-11-26 20:19:21 -08:00
max3107.h Fix common misspellings 2011-03-31 11:26:23 -03:00
mcf.c TTY: irq: Remove IRQF_DISABLED 2011-09-22 16:08:57 -07:00
mfd.c Merge 3.2-rc3 into tty-next to handle merge conflict in tty_ldisc.c 2011-11-26 20:07:25 -08:00
mpc52xx_uart.c mpc5200b/uart: select more tolerant uart prescaler on low baudrates 2012-03-08 13:15:50 -08:00
mpsc.c
mrst_max3110.c TTY: Remove redundant spi driver bus initialization 2011-11-26 20:19:21 -08:00
mrst_max3110.h max3110: add sysrq support 2011-08-26 11:01:15 -07:00
msm_serial_hs.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
msm_serial.c Merge branch 'next/dt' of git://git.linaro.org/people/arnd/arm-soc 2011-11-01 21:02:35 -07:00
msm_serial.h tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
msm_smd_tty.c TTY: remove re-assignments to tty_driver members 2012-03-08 11:37:58 -08:00
mux.c tty/serial/mux.c: linux/tty.h included twice 2012-02-24 13:50:45 -08:00
mxs-auart.c clock management changes for i.MX 2012-01-09 14:44:15 -08:00
netx-serial.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
nwpserial.c tty: Add export.h for EXPORT_SYMBOL/THIS_MODULE to exporters 2011-10-31 19:31:28 -04:00
of_serial.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
omap-serial.c omap-serial: Fix the error handling in the omap_serial probe 2012-04-09 10:30:38 -07:00
pch_uart.c Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-03-29 15:34:57 -07:00
pmac_zilog.c serial: Kill off NO_IRQ 2012-01-26 17:14:50 -08:00
pmac_zilog.h tty/serial/pmac_zilog: Fix suspend & resume 2011-12-16 11:10:01 +11:00
pnx8xxx_uart.c
pxa.c ARM: device tree work 2012-03-27 16:47:35 -07:00
sa1100.c ARM: 7342/2: sa1100: prepare for sparse irq conversion 2012-03-25 23:57:20 +01:00
samsung.c serial: samsung: fix s3c2442 platform data 2012-02-24 13:50:46 -08:00
samsung.h serial: samsung: merge probe() function from all SoC specific extensions 2011-12-23 10:07:00 +09:00
sb1250-duart.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
sc26xx.c TTY: serial: convert drivers/tty/serial/* to use module_platform_driver() 2011-11-30 20:11:46 +09:00
serial_core.c TTY: remove re-assignments to tty_driver members 2012-03-08 11:37:58 -08:00
serial_ks8695.c TTY: irq: Remove IRQF_DISABLED 2011-09-22 16:08:57 -07:00
serial_txx9.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
sh-sci.c SuperH updates for 3.4 merge window 2012-03-30 00:09:17 -07:00
sh-sci.h ARM: mach-shmobile: R-Mobile A1 support. 2011-11-11 16:55:31 +09:00
sirfsoc_uart.c pinctrl: API changes to support multiple states per device 2012-03-05 11:22:59 +01:00
sirfsoc_uart.h serial/sirf: fixup for changes to pin control 2012-02-22 17:59:12 +01:00
sn_console.c Miscellaneous Itanium patches 2012-03-23 17:19:37 -07:00
suncore.c tty: sparc: rename drivers/tty/serial/suncore.h -> include/linux/sunserialcore.h 2012-02-10 10:44:35 -08:00
sunhv.c Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
sunsab.c Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
sunsab.h
sunsu.c Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
sunzilog.c Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
sunzilog.h
timbuart.c TTY: serial: convert drivers/tty/serial/* to use module_platform_driver() 2011-11-30 20:11:46 +09:00
timbuart.h
uartlite.c Merge branch 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6 2011-10-27 08:35:41 +02:00
ucc_uart.c serial: Kill off NO_IRQ 2012-01-26 17:14:50 -08:00
vr41xx_siu.c serial: Kill off NO_IRQ 2012-01-26 17:14:50 -08:00
vt8500_serial.c tty: serial: vt8500: fix annotations for probe/remove 2012-03-12 10:21:55 -07:00
xilinx_uartps.c tty: Add module.h to drivers/tty users who just expect it there. 2011-10-31 19:31:27 -04:00
zs.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
zs.h