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Simon Glass 773598357c serial: Fix wakeup init logic to speed up startup 
The synchronize_rcu() call resulting from making every serial driver
wake-up capable (commit b3b708fa) slows boot down on my Tegra2x system
(with CONFIG_PREEMPT disabled).

But this is avoidable since it is the device_set_wakeup_enable() and then
subsequence disable which causes the delay. We might as well just make
the device wakeup capable but not actually enable it for wakeup until
needed.

Effectively the current code does this:

	device_set_wakeup_capable(dev, 1);
	device_set_wakeup_enable(dev, 1);
	device_set_wakeup_enable(dev, 0);

We can just drop the last two lines.

Before this change my boot log says:
[    0.227062] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    0.702928] serial8250.0: ttyS0 at MMIO 0x70006040 (irq = 69) is a Tegra

after:
[    0.227264] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    0.227983] serial8250.0: ttyS0 at MMIO 0x70006040 (irq = 69) is a Tegra

for saving of 450ms.

Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2012-01-24 16:29:40 -08:00
..
accessibility module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-01-18 15:51:48 -08:00
amba Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2012-01-08 13:10:57 -08:00
ata [libata] ata_piix: Add Toshiba Satellite Pro A120 to the quirks list 2012-01-17 20:50:53 -05:00
atm module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
auxdisplay
base Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2012-01-16 15:02:30 -08:00
bcma bcma: connect the bcma bus suspend/resume to the bcma driver suspend/resume 2012-01-17 09:54:08 -05:00
block nvme: fix merge error due to change of 'make_request_fn' fn type 2012-01-18 15:41:27 -08:00
bluetooth module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
cdrom block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
char tpm: fix (ACPI S3) suspend regression 2012-01-18 15:50:17 -08:00
clk
clocksource Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm 2012-01-06 18:15:25 -08:00
connector
cpufreq Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq 2012-01-11 18:53:33 -08:00
cpuidle
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2012-01-10 22:01:27 -08:00
dca
devfreq
dio
dma Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-01-17 18:40:24 -08:00
edac module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
eisa
firewire module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
firmware Merge commit '070680218379e15c1901f4bf21b98e3cbf12b527' into stable/for-linus-fixes-3.3 2012-01-12 11:53:55 -05:00
gpio gpio: tps65910: Use correct offset for gpio initialization 2012-01-18 13:48:43 -07:00
gpu nouveau: Support Optimus models for vga_switcheroo 2012-01-13 09:09:15 +00:00
hid module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
hv Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb 2012-01-09 12:09:47 -08:00
hwmon hwmon: (adm1031) Fix coding style issues 2012-01-16 22:51:48 +01:00
hwspinlock
i2c Merge branches 'for-33/i2c/eg20t' and 'for-33/i2c/omap' into for-linus/i2c-33 2012-01-17 23:30:41 +00:00
ide block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
idle Merge branches 'einj', 'intel_idle', 'misc', 'srat' and 'turbostat-ivb' into release 2012-01-18 01:15:54 -05:00
ieee802154
infiniband Merge branch 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-01-18 16:29:42 -08:00
input Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
iommu Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu 2012-01-10 11:08:21 -08:00
isdn Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
leds Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
lguest lguest: Make sure interrupt is allocated ok by lguest_setup_irq 2012-01-12 15:44:47 +10:30
macintosh module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
mca
md Merge branch 'for-3.3/core' of git://git.kernel.dk/linux-block 2012-01-15 12:24:45 -08:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-01-18 12:53:54 -08:00
memstick module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
message SCSI updates for post 3.2 merge window 2012-01-10 10:36:08 -08:00
mfd Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
misc Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-01-17 18:40:24 -08:00
mmc Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-01-17 18:40:24 -08:00
mtd Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-01-17 18:40:24 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-01-17 22:26:41 -08:00
nfc Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core 2012-01-07 12:03:30 -08:00
nubus
of 2nd set of device tree changes for v3.3 2012-01-14 13:25:55 -08:00
oprofile Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-01-06 08:02:58 -08:00
parisc Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-01-11 18:50:26 -08:00
parport Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
pci Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security 2012-01-14 18:36:33 -08:00
pcmcia Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2012-01-14 13:05:21 -08:00
pinctrl
platform module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
pnp PNP: work around Dell 1536/1546 BIOS MMCONFIG bug that breaks USB 2012-01-06 12:11:20 -08:00
power module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
pps
ps3
ptp
rapidio
regulator Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 2012-01-13 20:43:32 -08:00
rtc Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 2012-01-13 20:43:32 -08:00
s390 module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
sbus
scsi SCSI updates on 20120118 2012-01-18 12:35:17 -08:00
sfi
sh SH/R-Mobile updates for 3.3 merge window. 2012-01-11 23:29:20 -08:00
sn
spi Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-01-17 18:40:24 -08:00
ssb
staging Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-01-15 12:49:56 -08:00
target
tc
telephony
thermal
tty serial: Fix wakeup init logic to speed up startup 2012-01-24 16:29:40 -08:00
uio Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-01-11 18:50:26 -08:00
usb Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-01-17 18:40:24 -08:00
uwb Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb 2012-01-09 12:09:47 -08:00
vhost vhost-net: add module alias (v2.1) 2012-01-13 10:12:23 -08:00
video Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-01-17 18:40:24 -08:00
virt
virtio virtio: balloon: Add freeze, restore handlers to support S4 2012-01-12 15:44:47 +10:30
vlynq
w1
watchdog module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
xen xen: using EXPORT_SYMBOL requires including export.h 2012-01-18 15:37:49 -08:00
zorro
Kconfig
Makefile mmc: sdhci-pci: add platform data 2012-01-11 23:58:47 -05:00