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linux-2.6/drivers/tty
Paul Walmsley 197234520b tty: serial: omap-serial: wakeup latency constraint is in microseconds, not milliseconds
The receive FIFO wakeup latency estimate in the omap-serial driver is
three orders of magnitude too small.  This effectively prevents the
MPU from going to a low-power state when CONFIG_CPU_IDLE=y.  This is a
major power management regression and masks some other FIFO-related
bugs in the driver.

Fix by correcting the most egregious problem in the RX wakeup latency
estimate.  There are several other flaws in the estimator; these will
be fixed by a separate patch series intended for 3.4.

The difference in low-power states with this patch can be observed via
debugfs in pm_debug/count.

This estimate does not have any effect when CONFIG_CPU_IDLE=n.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Alan Cox <alan@linux.intel.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 10:48:36 -08:00
..
hvc
ipwireless
serial tty: serial: omap-serial: wakeup latency constraint is in microseconds, not milliseconds 2012-02-09 10:48:36 -08:00
vt drivers/tty/vt/vt_ioctl.c: fix KDFONTOP 32bit compatibility layer 2012-02-02 16:11:23 -08:00
Kconfig
Makefile
amiserial.c
bfin_jtag_comm.c
cyclades.c
ehv_bytechan.c
isicom.c
moxa.c
moxa.h
mxser.c
mxser.h
n_gsm.c
n_hdlc.c
n_r3964.c
n_tracerouter.c
n_tracesink.c
n_tracesink.h
n_tty.c
nozomi.c
pty.c
rocket.c module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
rocket.h
rocket_int.h
synclink.c module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
synclink_gt.c
synclinkmp.c module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
sysrq.c
tty_audit.c
tty_buffer.c
tty_io.c Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty 2012-01-09 12:09:24 -08:00
tty_ioctl.c
tty_ldisc.c
tty_mutex.c
tty_port.c TTY: fix UV serial console regression 2012-01-24 12:55:37 -08:00