Paul Walmsley be4b028195 tty: serial: OMAP: block idle while the UART is transferring data in PIO mode ... Prevent OMAP UARTs from going idle while they are still transferring data in PIO mode. This works around an oversight in the OMAP UART hardware present in OMAP34xx and earlier: an idle UART won't send a wakeup when the TX FIFO threshold is reached. This causes long delays during data transmission when the MPU powerdomain enters a low-power mode. The MPU interrupt controller is not able to respond to interrupts when it's in a low-power state, so the TX buffer is not refilled until another wakeup event occurs. This fix changes the erratum i291 DMA idle workaround. Rather than toggling between force-idle and no-idle, it will toggle between smart-idle and no-idle. The important part of the workaround is the no-idle part, so this shouldn't result in any change in behavior. This fix should work on all OMAP UARTs. Future patches intended for the 3.4 merge window will make this workaround conditional on a "feature" flag, and will use the OMAP36xx+ TX event wakeup support. Thanks to Kevin Hilman <khilman@ti.com> for mentioning the erratum i291 workaround, which led to the development of this approach. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Alan Cox <alan@linux.intel.com> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Acked-by: Govindraj.R <govindraj.raja@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-by: Kevin Hilman <khilman@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-02-09 10:48:34 -08:00
..
8250	m32r: relocate drivers back out of 8250 dir	2012-02-08 15:04:32 -08:00
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
68328serial.c	TTY: irq: Remove IRQF_DISABLED	2011-09-22 16:08:57 -07:00
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	Merge branch 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6	2011-10-27 08:35:41 +02:00
amba-pl010.c	serial: pl010: Enable module alias autogeneration for AMBA drivers	2011-11-22 10:58:32 +00:00
amba-pl011.c	serial: amba-pl011: lock console writes against interrupts	2012-01-24 16:09:55 -08:00
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	atmel_serial: fix spinlock lockup in RS485 code	2012-01-04 16:19:34 -08:00
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: Remove ASYNC_CTS_FLOW flag for hardware automatic CTS.	2011-12-13 09:50:15 -08:00
clps711x.c
crisv10.c	RS485: fix inconsistencies in the meaning of some variables	2011-11-15 12:13:44 -08:00
crisv10.h
dz.c	TTY: serial, fix includes in some drivers	2011-09-22 15:49:26 -07:00
dz.h
icom.c	TTY: irq: Remove IRQF_DISABLED	2011-09-22 16:08:57 -07:00
icom.h
ifx6x60.c	TTY: Remove redundant spi driver bus initialization	2011-11-26 20:19:21 -08:00
ifx6x60.h
imx.c	tty: serial: imx: move del_timer_sync() to avoid potential deadlock	2012-01-04 16:30:36 -08:00
ioc3_serial.c	TTY: serial, fix includes in some drivers	2011-09-22 15:49:26 -07:00
ioc4_serial.c	TTY: serial, fix includes in some drivers	2011-09-22 15:49:26 -07:00
ip22zilog.c
ip22zilog.h
Kconfig	serial: Kill off Moorestown code	2012-01-26 11:19:46 -08:00
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.c	m32r: relocate drivers back out of 8250 dir	2012-02-08 15:04:32 -08:00
m32r_sio.h	m32r: relocate drivers back out of 8250 dir	2012-02-08 15:04:32 -08:00
m32r_sio_reg.h	m32r: relocate drivers back out of 8250 dir	2012-02-08 15:04:32 -08:00
Makefile	serial: Kill off Moorestown code	2012-01-26 11:19:46 -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
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	TTY: irq: Remove IRQF_DISABLED	2011-09-22 16:08:57 -07:00
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.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
msm_serial_hs.c	msm_serial_hs: Fix spinlock recursion in handling CTS	2011-12-09 19:10:04 -08:00
msm_smd_tty.c
mux.c	TTY: serial, fix includes in some drivers	2011-09-22 15:49:26 -07:00
mxs-auart.c	clock management changes for i.MX	2012-01-09 14:44:15 -08:00
netx-serial.c
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	tty: serial: OMAP: block idle while the UART is transferring data in PIO mode	2012-02-09 10:48:34 -08:00
pch_uart.c	Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma	2012-01-17 18:40:24 -08:00
pmac_zilog.c	tty/serial/pmac_zilog: Fix suspend & resume	2011-12-16 11:10:01 +11:00
pmac_zilog.h	tty/serial/pmac_zilog: Fix suspend & resume	2011-12-16 11:10:01 +11:00
pnx8xxx_uart.c
pxa.c	serial: pxa: work around for errata #20	2011-09-22 15:47:53 -07:00
sa1100.c
samsung.c	serial: samsung: Add support for EXYNOS5250	2012-02-02 16:11:24 -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	serial: Fix wakeup init logic to speed up startup	2012-01-24 16:29:40 -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	Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma	2012-01-17 18:40:24 -08:00
sh-sci.h	ARM: mach-shmobile: R-Mobile A1 support.	2011-11-11 16:55:31 +09:00
sirfsoc_uart.c	UART: add CSR SiRFprimaII SoC on-chip uart drivers	2011-11-17 11:46:04 -08:00
sirfsoc_uart.h	UART: add CSR SiRFprimaII SoC on-chip uart drivers	2011-11-17 11:46:04 -08:00
sn_console.c	TTY: irq: Remove IRQF_DISABLED	2011-09-22 16:08:57 -07:00
suncore.c
suncore.h
sunhv.c
sunsab.c
sunsab.h
sunsu.c	treewide: Convert uses of struct resource to resource_size(ptr)	2011-06-10 14:55:36 +02:00
sunzilog.c
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	drivers/serial/ucc_uart.c: Add missing call to init UCC UART port timeout	2011-11-24 02:23:45 -06:00
vr41xx_siu.c	TTY: serial: convert drivers/tty/serial/* to use module_platform_driver()	2011-11-30 20:11:46 +09:00
vt8500_serial.c	treewide: Convert uses of struct resource to resource_size(ptr)	2011-06-10 14:55:36 +02:00
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	TTY: serial, fix includes in some drivers	2011-09-22 15:49:26 -07:00
zs.h