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9b80fee149
linux/drivers/serial
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Anton Vorontsov 24d481ecae 8250: Now honours baud rate lower bounds 
A platform clock drives 8250 ports in most SOC systems, the clock
might run at high frequencies, and so it's not always possible to
downscale uart clock to a desired value.

Currently the 8250 uart driver accepts not supported baud rates, and
what is worse, it is doing this silently, and then passes not accepted
values to a new termios, so userspace has no chance to catch this kind
of errors (userspace verifies that settings were accepted by reading
back and comparing the settings).

This patch fixes the issue by passing minimum baud rate to the
uart_get_baud_rate() call, the call should take care of all bounds,
so userspace should now report:

  # stty -F /dev/ttyS0 speed 300
  115200
  stty: /dev/ttyS0: unable to perform all requested operations

p.s. uart_get_baud_rate() falls back to 9600, which still might be too
     low for some 10 GHz platforms, but that's a separate issue, and
     we can wait with fixing this till we find such a platform.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-09-19 13:13:20 -07:00
..
cpm_uart cpm_uart: Don't use alloc_bootmem in cpm_uart_cpm2.c 2009-07-29 23:22:23 -05:00
jsm jsm: clean up "serial: jsm: correctly support 4 8 port boards" 2009-06-24 09:55:50 -07:00
8250_accent.c
8250_acorn.c
8250_boca.c
8250_early.c 8250: switch 8250 drivers to use _nocache ioremaps 2008-05-01 08:04:00 -07:00
8250_exar_st16c554.c
8250_fourport.c
8250_gsc.c serial: 8250_gsc: fix printk format error 2009-05-29 08:40:02 -07:00
8250_hp300.c 8250_hp300: coding style 2008-02-08 09:22:25 -08:00
8250_hub6.c 8250_hub6: codding style 2008-02-08 09:22:25 -08:00
8250_mca.c
8250_pci.c Remove multiple KERN_ prefixes from printk formats 2009-07-08 10:30:03 -07:00
8250_pnp.c serial: Update PNP IDs 2009-04-06 14:36:26 -07:00
8250.c 8250: Now honours baud rate lower bounds 2009-09-19 13:13:20 -07:00
8250.h serial: 8250: add IRQ trigger support 2009-09-19 13:13:19 -07:00
21285.c [ARM] acorn,ebsa110,footbridge,integrator,sa1100: Convert asm/io.h to linux/io.h 2009-03-25 10:21:35 +00:00
68328serial.c serial, 8250: remove NR_IRQ usage 2008-10-16 16:52:02 +02:00
68328serial.h
68360serial.c Fix compile errors in SGI console drivers (linux-next tree) 2008-07-20 17:12:36 -07:00
amba-pl010.c [ARM] 5544/1: Trust PrimeCell resource sizes 2009-06-11 15:36:56 +01:00
amba-pl011.c ARM: 5626/1: add suspend/resume functions to amba-pl011 serial driver 2009-09-02 11:21:15 +01:00
atmel_serial.c drivers/serial/atmel_serial.c: fix compile when CONFIG_SERIAL_ATMEL=Y and CONFIG_SERIAL_ATMEL_CONSOLE=N 2009-07-29 19:10:37 -07:00
bfin_5xx.c serial: bfin_5xx: fix building as module when early printk is enabled 2009-09-19 13:13:09 -07:00
bfin_sport_uart.c drivers/serial/bfin_sport_uart.c: remove wrong and unneeded memset 2009-07-16 09:19:16 -07:00
bfin_sport_uart.h Blackfin serial driver: this driver enable SPORTs on Blackfin emulate UART 2008-04-30 08:29:30 -07:00
clps711x.c [ARM] acorn,ebsa110,footbridge,integrator,sa1100: Convert asm/io.h to linux/io.h 2009-03-25 10:21:35 +00:00
crisv10.c CRISv10: fix serial driver proc-usage 2009-05-02 15:36:09 -07:00
crisv10.h tty: Use the generic RS485 ioctl on CRIS 2009-04-07 08:44:05 -07:00
dz.c serial: DZ11: avoid a hang at console switch-over 2008-07-24 10:47:29 -07:00
dz.h
icom.c tty: icom: bit and/or confusion? 2009-09-19 13:13:11 -07:00
icom.h
imx.c i.MX serial: do not use #ifdef CONFIG_ARCH_* 2009-08-07 12:10:53 +02:00
ioc3_serial.c [IA64] Fix section mismatch ioc3uart_init()/ioc3uart_submodule 2008-12-09 10:08:51 -08:00
ioc4_serial.c [IA64] ioc4_serial: fix printk format warnings 2009-09-15 08:42:47 -07:00
ip22zilog.c Fix compile errors in SGI console drivers (linux-next tree) 2008-07-20 17:12:36 -07:00
ip22zilog.h
Kconfig Merge branch 'master' into devel 2009-09-12 12:04:37 +01:00
kgdboc.c tty: The big operations rework 2008-04-30 08:29:47 -07:00
m32r_sio_reg.h
m32r_sio.c drivers/serial: use nr_irqs 2008-10-16 16:52:06 +02:00
m32r_sio.h
Makefile ARM: S5PC100: UART and Serial 2009-08-16 23:24:37 +01:00
max3100.c tty: MAX3100 2009-04-08 14:33:38 -07:00
mcf.c m68knommu: Fix support for console port other than ttyS0 on mcf.c 2009-03-24 15:17:43 +10:00
mpc52xx_uart.c powerpc/5xxx: Add common mpc5xxx_get_bus_frequency() function 2009-06-17 00:30:22 -06:00
mpsc.c kgdb: kgdboc console poll hooks for mpsc uart 2008-07-23 11:30:16 -05:00
msm_serial.c serial: don't add msm_serial's probe function to the driver struct 2009-07-16 09:19:16 -07:00
msm_serial.h msm_serial: serial driver for MSM7K onboard serial peripheral. 2009-06-22 11:32:25 -07:00
mux.c Fix compile errors in SGI console drivers (linux-next tree) 2008-07-20 17:12:36 -07:00
netx-serial.c [ARM] build fixes for netX serial driver 2008-10-30 09:41:59 +01:00
nwpserial.c serial/nwpserial: Fix wrong register read address and add interrupt acknowledge. 2009-05-15 16:43:42 +10:00
of_serial.c Merge commit 'origin/master' into next 2009-06-18 11:16:55 +10:00
pmac_zilog.c powerpc/pmac: Fix internal modem IRQ on Wallstreet PowerBook 2009-04-07 15:07:43 +10:00
pmac_zilog.h
pnx8xxx_uart.c When a break signal is detected, the next character should be ignored. 2009-01-15 12:48:36 -08:00
pxa.c [ARM] pxa: remove machine class specific stuffs from serial driver 2009-03-09 21:22:38 +08:00
s3c24a0.c ARM: S3C24XX: serial: Fix section mismatch warnings 2009-07-30 23:56:41 +01:00
s3c2400.c ARM: S3C24XX: serial: Fix section mismatch warnings 2009-07-30 23:56:41 +01:00
s3c2410.c ARM: S3C24XX: serial: Fix section mismatch warnings 2009-07-30 23:56:41 +01:00
s3c2412.c ARM: S3C24XX: serial: Fix section mismatch warnings 2009-07-30 23:56:41 +01:00
s3c2440.c ARM: S3C24XX: serial: Fix section mismatch warnings 2009-07-30 23:56:41 +01:00
s3c6400.c ARM: S3C64XX: serial: Fix section mismatch warning 2009-07-30 23:56:41 +01:00
sa1100.c [ARM] acorn,ebsa110,footbridge,integrator,sa1100: Convert asm/io.h to linux/io.h 2009-03-25 10:21:35 +00:00
samsung.c serial: samsung.c: mark s3c24xx_serial_remove as __devexit 2009-06-22 11:32:24 -07:00
samsung.h serial: samsung.c: mark s3c24xx_serial_remove as __devexit 2009-06-22 11:32:24 -07:00
sb1250-duart.c serial: fix off by one errors 2009-06-22 11:32:23 -07:00
sc26xx.c Fix compile errors in SGI console drivers (linux-next tree) 2008-07-20 17:12:36 -07:00
serial_core.c serial: fixup /proc/tty/driver/serial after proc_fops conversion 2009-04-01 14:50:48 -07:00
serial_cs.c tty: serial/pcmcia: add ID for Advantech card 2009-09-19 13:13:10 -07:00
serial_ks8695.c ARM: 5688/1: ks8695_serial: disable_irq() lockup 2009-09-02 17:22:44 +01:00
serial_lh7a40x.c [ARM] lh7a40x: avoid polluting the kernel's namespace 2008-11-28 16:39:04 +00:00
serial_txx9.c kgdb: kgdboc console poll hooks for serial_txx9 uart 2009-06-24 09:55:50 -07:00
sh-sci.c sh: Add initial support for SH7757 CPU subtype 2009-08-21 17:25:47 +09:00
sh-sci.h sh: Add initial support for SH7757 CPU subtype 2009-08-21 17:25:47 +09:00
sn_console.c Altix serial: fix 2008-10-20 08:52:36 -07:00
suncore.c
suncore.h
sunhv.c serial: fix off by one errors 2009-06-22 11:32:23 -07:00
sunsab.c sparc: Annotate of_device_id arrays with const or __initdata. 2008-08-31 01:23:17 -07:00
sunsab.h
sunsu.c serial: sunsu: sunsu_kbd_ms_init needs to be __devinit 2009-04-08 03:29:03 -07:00
sunzilog.c serial: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
sunzilog.h
timbuart.c timbuart: Fix for tx_empty 2009-06-22 11:32:25 -07:00
timbuart.h serial: Added Timberdale UART driver 2009-06-11 08:51:06 -07:00
uartlite.c powerpc/virtex: fix various format/casting printk mismatches 2008-11-14 09:59:48 -07:00
ucc_uart.c serial: Make ucc_uart work in HW UART mode 2009-06-15 21:45:31 -05:00
vr41xx_siu.c Update Yoichi Yuasa's e-mail address 2009-07-03 15:45:29 +01:00
zs.c serial: fix off by one errors 2009-06-22 11:32:23 -07:00
zs.h