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9636b755da
linux/drivers/tty/serial
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Doug Anderson 9636b755da tty/serial: Prevent drop of DCD on suspend for Tegra UARTs 
On Tegra UARTs (except UART1), the DTR / DCD / DSR lines are not
externally accessible.  Instead, the DTR line internally appears to be
looped back to be the input to the DCD and DSR lines.  The net effect
of this is that when we drop DTR (like when we suspend), we'll see DCD
drop too.  ...and when we see DCD drop, we treat that as a hangup.

In order to prevent this hangup from occurring at every sleep, we need
to force DTR to remain high on Tegra UARTs.

This patch uses the mcr_mask / mcr_force fields, which were originally
added for the kludge ALPHA_KLUDGE_MCR.  Using these fields does not
prevent us from removing ALPHA_KLUDGE_MCR--we can just remove the "if"
tests I have added and always init mcr_mask / mcr_force from the
serial8250_config.

NOTE: If we have people that are using UARTA on a Tegra and need to
control DTR, we'll need to either add a separate port type for UARTA
or we'll need to add some tegra-specific code to detect whether the
DTR needs to be left high.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-11-15 12:13:41 -08:00
..
cpm_uart TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
jsm tty: Add module.h to drivers/tty users who just expect it there. 2011-10-31 19:31:27 -04:00
8250_accent.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
8250_acorn.c
8250_boca.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
8250_dw.c tty: add a DesignWare 8250 driver 2011-08-26 11:38:46 -07:00
8250_early.c
8250_exar_st16c554.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
8250_fourport.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
8250_gsc.c
8250_hp300.c
8250_hub6.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
8250_mca.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
8250_pci.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
8250_pnp.c serial: 8250_pnp: add Intermec CV60 touchscreen device 2011-08-22 14:18:44 -07:00
8250.c tty/serial: Prevent drop of DCD on suspend for Tegra UARTs 2011-11-15 12:13:41 -08:00
8250.h tty/serial: Prevent drop of DCD on suspend for Tegra UARTs 2011-11-15 12:13:41 -08:00
21285.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
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 clk: amba-pl010: convert to clk_prepare()/clk_unprepare() 2011-09-27 09:25:52 +01:00
amba-pl011.c clk: amba-pl011: convert to clk_prepare()/clk_unprepare() 2011-09-27 09:25:52 +01:00
apbuart.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
apbuart.h
atmel_serial.c Merge branch 'gpio' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm 2011-10-27 08:39:10 +02:00
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 TTY: irq: Remove IRQF_DISABLED 2011-09-22 16:08:57 -07:00
bfin_sport_uart.h
bfin_uart.c TTY: irq: Remove IRQF_DISABLED 2011-09-22 16:08:57 -07:00
clps711x.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
crisv10.c TTY: irq: Remove IRQF_DISABLED 2011-09-22 16:08:57 -07:00
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 net: remove mm.h inclusion from netdevice.h 2011-06-21 19:17:20 -07:00
ifx6x60.h serial: ifx6x60: minor cleanup 2011-02-17 11:16:15 -08:00
imx.c Merge branch 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6 2011-10-27 08:35:41 +02:00
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 Fix common misspellings 2011-03-31 11:26:23 -03:00
ip22zilog.h
Kconfig pch_uart: Support new device LAPIS Semiconductor ML7831 IOH 2011-11-15 12:04:12 -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_reg.h
m32r_sio.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
m32r_sio.h
Makefile TTY: serial, move 68360 driver to staging 2011-09-22 16:00:20 -07:00
max3100.c tty: Add module.h to drivers/tty users who just expect it there. 2011-10-31 19:31:27 -04:00
max3107-aava.c tty: Add module.h to drivers/tty users who just expect it there. 2011-10-31 19:31:27 -04:00
max3107.c tty: Add module.h to drivers/tty users who just expect it there. 2011-10-31 19:31:27 -04:00
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 serial: mfd: Initconst section fixes 2011-09-22 16:05:09 -07:00
mpc52xx_uart.c TTY: irq: Remove IRQF_DISABLED 2011-09-22 16:08:57 -07:00
mpsc.c
mrst_max3110.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
mrst_max3110.h max3110: add sysrq support 2011-08-26 11:01:15 -07:00
msm_serial_hs.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -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 tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
msm_smd_tty.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
mux.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
mxs-auart.c Freescale STMP37XX/STMP378X Application UART driver: remove duplicate linux/device.h include 2011-02-15 18:35:42 +01:00
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: Allow IXON and IXOFF to be disabled. 2011-08-23 10:58:38 -07:00
pch_uart.c pch_uart: Change company name OKI SEMICONDUCTOR to LAPIS Semiconductor 2011-11-15 12:04:18 -08:00
pmac_zilog.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
pmac_zilog.h
pnx8xxx_uart.c
pxa.c serial: pxa: work around for errata #20 2011-09-22 15:47:53 -07:00
s3c2410.c serial: Remove redundant console_initcall from s3c and s5p console drivers 2011-07-20 19:10:43 +09:00
s3c2412.c serial: Remove redundant console_initcall from s3c and s5p console drivers 2011-07-20 19:10:43 +09:00
s3c2440.c serial: Remove redundant console_initcall from s3c and s5p console drivers 2011-07-20 19:10:43 +09:00
s3c6400.c serial: Remove redundant console_initcall from s3c and s5p console drivers 2011-07-20 19:10:43 +09:00
s5pv210.c Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6 2011-07-25 23:09:27 -07:00
sa1100.c tty: remove invalid location line in file header 2011-04-19 16:33:36 -07:00
samsung.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
samsung.h serial: samsung: Add unified interrupt handler for s3c64xx and later SoC's 2011-08-23 10:48:31 -07:00
sb1250-duart.c TTY: serial, fix includes in some drivers 2011-09-22 15:49:26 -07:00
sc26xx.c
serial_core.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
serial_cs.c pcmcia: Convert pcmcia_device_id declarations to const 2011-05-06 07:46:22 +02:00
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 2011-11-04 18:02:25 -07:00
sh-sci.h serial: sh-sci: FIFO sizing helper consolidation. 2011-06-14 17:38:19 +09:00
sn_console.c TTY: irq: Remove IRQF_DISABLED 2011-09-22 16:08:57 -07:00
suncore.c
suncore.h
sunhv.c dt/serial: Eliminate users of of_platform_{,un}register_driver 2011-02-28 13:22:46 -07:00
sunsab.c dt/serial: Eliminate users of of_platform_{,un}register_driver 2011-02-28 13:22:46 -07:00
sunsab.h
sunsu.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
sunzilog.c Fix common misspellings 2011-03-31 11:26:23 -03:00
sunzilog.h
timbuart.c tty: Add module.h to drivers/tty users who just expect it there. 2011-10-31 19:31:27 -04:00
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 Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty 2011-10-26 15:11:09 +02:00
vr41xx_siu.c
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