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OpenCloudOS-Kernel
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Linus Walleij 04566831a7 mmc: Aggressive clock gating framework 
This patch modifies the MMC core code to optionally call the set_ios()
operation on the driver with the clock frequency set to 0 (gate) after
a grace period of at least 8 MCLK cycles, then restore it (ungate)
before any new request. This gives the driver the option to shut down
the MCI clock to the MMC/SD card when the clock frequency is 0, i.e.
the core has stated that the MCI clock does not need to be generated.

It is inspired by existing clock gating code found in the OMAP and
Atmel drivers and brings this up to the host abstraction.  Gating is
performed before and after any MMC request.

This patchset implements this for the MMCI/PL180 MMC/SD host controller,
but it should be simple to switch OMAP/Atmel over to using this instead.

mmc_set_{gated,ungated}() add variable protection to the state holders
for the clock gating code.  This is particularly important when ordinary
.set_ios() calls would race with the .set_ios() call resulting from a
delayed gate operation.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Reviewed-by: Chris Ball <cjb@laptop.org>
Tested-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
 		2011-01-08 22:48:03 -05:00
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accessibility
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acpi Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-01-07 17:02:58 -08:00
amba
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ata Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
atm Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-04 11:57:25 -08:00
auxdisplay
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base
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block Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
bluetooth
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cdrom gdrom: don't use flush_scheduled_work() 2010-12-24 15:59:06 +01:00
char Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-01-07 17:02:58 -08:00
clk
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clocksource clocksource: sh_cmt: Remove nested spinlock fix 2010-12-17 19:38:33 +09:00
connector connector: Use this_cpu operations 2010-12-17 15:18:05 +01:00
cpufreq perf: Clean up power events by introducing new, more generic ones 2011-01-04 08:16:54 +01:00
cpuidle Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-01-07 17:02:58 -08:00
crypto
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dca
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dio
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dma dma: shdma: don't register the global die notifier multiple times 2011-01-07 11:03:26 +09:00
edac Merge branch 'mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp 2011-01-07 14:54:03 -08:00
eisa
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firewire firewire: ohci: fix regression with Agere FW643 rev 06, disable MSI 2010-12-12 15:47:02 +01:00
firmware
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gpio Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
gpu Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2011-01-07 14:45:47 -08:00
hwmon hwmon: (s3c-hwmon) Fix compilation 2011-01-02 15:31:11 -08:00
i2c I2C: i2c-omap: Change device name: i2c_omap -> omap_i2c 2010-12-20 17:53:04 -08:00
ide
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idle perf: Clean up power events by introducing new, more generic ones 2011-01-04 08:16:54 +01:00
ieee802154
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infiniband Merge branch 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin 2011-01-07 08:56:33 -08:00
input Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-01-07 17:02:58 -08:00
isdn Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
leds Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
lguest
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macintosh Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
mca
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md Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-12-20 09:19:46 -08:00
media Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
memstick
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message
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mfd Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
misc ioc4: use static work_struct for ioc4_load_modules() 2010-12-24 16:14:20 +01:00
mmc mmc: Aggressive clock gating framework 2011-01-08 22:48:03 -05:00
mtd Merge branch 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin 2011-01-07 08:56:33 -08:00
net Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
nubus
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of of/i2c: Fix request module by alias 2010-12-24 01:28:54 -07:00
oprofile
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parisc
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parport
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pci PCI hotplug: Fix unexpected driver unregister in pciehp_acpi.c 2010-12-23 12:51:49 -08:00
pcmcia Merge branch 'devel-stable' into devel 2011-01-06 22:33:32 +00:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-01-06 11:06:31 -08:00
pnp ACPI/PNP: avoid section mismatch warning 2010-12-11 02:01:47 -05:00
power workqueue: convert cancel_rearming_delayed_work[queue]() users to cancel_delayed_work_sync() 2010-12-15 10:56:11 +01:00
pps
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ps3
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rapidio
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regulator
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rtc Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
s390 Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-01-07 17:02:58 -08:00
sbus
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scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2011-01-07 12:47:02 -08:00
serial Merge branch 'rmobile-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2011-01-07 14:50:14 -08:00
sfi
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sh sh: intc: Initialize radix tree gfp mask explicitly. 2010-12-24 19:38:37 +09:00
sn
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spi Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6 2011-01-07 17:08:46 -08:00
ssb ssb: Use pci_is_pcie() 2010-12-22 15:43:26 -05:00
staging Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-01-07 17:02:58 -08:00
tc
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telephony
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thermal
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tty Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6 2011-01-07 14:39:20 -08:00
uio
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usb Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
uwb Merge branch 'usb-next' into musb-merge 2010-12-16 10:05:06 -08:00
vhost Merge branch 'vhost-net-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost 2010-12-14 11:33:23 -08:00
video Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
virtio
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vlynq
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w1
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watchdog Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-01-06 16:50:35 -08:00
xen xen: Use this_cpu_inc_return 2010-12-17 15:18:05 +01:00
zorro
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Kconfig
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Makefile Merge branch 'smp' into misc 2011-01-06 22:32:03 +00:00