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081c9025f4
linux/drivers
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Shawn Guo 081c9025f4 clk: divider: do not propagate rate change request when unnecessary 
If the current rate of parent clock is sufficient to provide child a
requested rate with a proper divider setting, the rate change request
should not be propagated.  Instead, changing the divider setting is good
enough to get child clock run at the requested rate.

On an imx6q clock configuration illustrated below,

  ahb --> ipg --> ipg_per
  132M    66M     66M

calling clk_set_rate(ipg_per, 22M) with the current
clk_divider_bestdiv() implementation will result in the rate change up
to ahb level like the following, because of the unnecessary/incorrect
rate change propagation.

  ahb --> ipg --> ipg_per
  66M     22M     22M

Fix the problem by trying to see if the requested rate can be achieved
by simply changing the divider value, and in that case return the
divider immediately from function clk_divider_bestdiv() as the best
one, so that all those unnecessary rate change propagation can be saved.

Reported-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
2013-06-10 15:20:48 -07:00
..
accessibility
acpi Power management and ACPI fixes for 3.10-rc3 2013-05-25 20:32:00 -07:00
amba
ata drivers/ata: don't check resource with devm_ioremap_resource 2013-05-12 15:19:46 +02:00
atm
auxdisplay
base Driver core fixes for 3.10-rc2 2013-05-23 09:27:08 -07:00
bcma bcma: add more core IDs 2013-05-17 14:31:05 -04:00
block drivers/block/brd.c: fix brd_lookup_page() race 2013-05-24 16:22:52 -07:00
bluetooth
bus
cdrom block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
char random: fix accounting race condition with lockless irq entropy_count update 2013-05-24 16:22:52 -07:00
clk clk: divider: do not propagate rate change request when unnecessary 2013-06-10 15:20:48 -07:00
clocksource ARM: late Exynos multiplatform changes 2013-05-07 11:28:42 -07:00
connector
cpufreq Power management and ACPI fixes for 3.10-rc3 2013-05-25 20:32:00 -07:00
cpuidle
crypto drivers/crypto/nx: Fixes for multiple races and issues 2013-05-24 18:11:10 +10:00
dca
devfreq
dio
dma Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma 2013-05-25 20:30:31 -07:00
edac amd64_edac: Fix bogus sysfs file permissions 2013-05-21 09:13:11 +02:00
eisa
extcon Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
firewire IEEE 1394 (FireWire) subsystem changes: 2013-05-09 10:11:48 -07:00
firmware
gpio GPIO fixes for the v3.10 series: 2013-05-23 18:24:10 -07:00
gpu Merge branch 'drm-radeon-sun-hainan' of git://people.freedesktop.org/~airlied/linux 2013-05-21 08:50:57 -07:00
hid HID: debug: fix RCU preemption issue 2013-05-06 13:07:33 +02:00
hsi
hv Drivers: hv: Fix a bug in get_vp_index() 2013-05-21 09:56:55 -07:00
hwmon hwmon: (tmp401) Drop redundant safety on cache lifetime 2013-05-19 08:19:29 -07:00
hwspinlock A single patch from Vincent extending OMAP's hwspinlock support to OMAP5. 2013-05-07 14:01:27 -07:00
i2c Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-05-21 11:11:45 -07:00
ide block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
idle Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2013-05-11 15:23:17 -07:00
iio iio: exynos_adc: fix wrong structure extration in suspend and resume 2013-05-22 22:15:20 +01:00
infiniband InfiniBand/RDMA changes for the 3.10 merge window: 2013-05-08 15:29:48 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2013-05-23 13:50:03 -07:00
iommu IOMMU Updates for Linux v3.10 2013-05-06 14:59:13 -07:00
ipack
irqchip ARM: late Exynos multiplatform changes 2013-05-07 11:28:42 -07:00
isdn isdn/kcapi: fix a small underflow 2013-05-20 13:38:14 -07:00
leds drivers/leds/leds-ot200.c: fix error caused by shifted mask 2013-05-24 16:22:51 -07:00
lguest lguest: clear cached last cpu when guest_set_pgd() called. 2013-05-08 10:49:18 +09:30
macintosh
mailbox
md dm thin: fix metadata dev resize detection 2013-05-19 18:57:50 +01:00
media
memory drivers/memory: don't check resource with devm_ioremap_resource 2013-05-18 11:55:52 +02:00
memstick block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
message Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block 2013-05-08 10:13:35 -07:00
mfd mfd: db8500: Update BML clock register for db8580 2013-06-06 18:17:16 -07:00
misc char/misc driver fixes for 3.10-rc2 2013-05-23 09:26:32 -07:00
mmc Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 2013-05-15 13:37:54 -07:00
mtd drivers/mtd/nand: don't check resource with devm_ioremap_resource 2013-05-18 11:55:55 +02:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-05-24 08:27:32 -07:00
nfc
ntb NTB: Multiple NTB client fix 2013-05-15 10:58:22 -07:00
nubus nubus: Kill nubus_proc_detach_device() 2013-05-04 14:47:26 -04:00
of Device tree bug fixes and documentation updates for v3.10 2013-05-18 10:46:50 -07:00
oprofile
parisc parisc/superio: Use module_pci_driver to register driver 2013-05-24 22:35:46 +02:00
parport
pci PCI: acpiphp: Re-enumerate devices when host bridge receives Bus Check 2013-05-17 14:12:06 -06:00
pcmcia
pinctrl Pinctrl fixes for the v3.10 series: 2013-05-20 07:59:46 -07:00
platform - Artem's removal of dead code continues (RPX, MBX860) 2013-05-10 09:09:47 -07:00
pnp
power Last minute one-liners: wrong kfree usage fix, module alias fixup and 2013-05-25 20:32:49 -07:00
pps
ps3
ptp
pwm drivers/pwm: don't check resource with devm_ioremap_resource 2013-05-18 11:55:58 +02:00
rapidio rapidio/tsi721: fix bug in MSI interrupt handling 2013-05-24 16:22:51 -07:00
regulator Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
remoteproc This pull request contains: 2013-05-07 14:04:56 -07:00
reset
rpmsg A small pull request consisting of: 2013-05-07 14:02:00 -07:00
rtc drivers/rtc/rtc-max8998.c: check for pdata presence before dereferencing 2013-05-24 16:22:53 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2013-05-21 09:36:46 -07:00
sbus
scsi Merge branch 'postmerge' into for-linus 2013-05-10 07:54:01 -07:00
sfi
sh
sn
spi Merge branch 'devm_no_resource_check' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-05-18 10:54:54 -07:00
ssb - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
ssbi
staging Staging driver fixes for 3.10-rc2 2013-05-23 09:27:49 -07:00
target Merge branch 'queue' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-05-16 07:55:07 -07:00
tc
thermal drivers/thermal: don't check resource with devm_ioremap_resource 2013-05-18 11:57:30 +02:00
tty ARM: SoC fixes for 3.10-rc 2013-05-24 16:27:37 -07:00
uio uio: UIO_DMEM_GENIRQ should depend on HAS_DMA 2013-05-21 10:13:23 -07:00
usb USB fixes for 3.10-rc2 2013-05-23 09:23:32 -07:00
uwb
vfio
vhost Add missing module license tag to vring helpers. 2013-05-08 10:49:03 +09:30
video fbdev: FB_GOLDFISH should depend on HAS_DMA 2013-05-24 16:22:52 -07:00
virt
virtio
vlynq
vme
w1 drivers/w1/masters: don't check resource with devm_ioremap_resource 2013-05-18 11:58:03 +02:00
watchdog drivers/watchdog: don't check resource with devm_ioremap_resource 2013-05-18 11:58:04 +02:00
xen xen: Fixed assignment error in if statement 2013-05-20 14:14:48 -04:00
zorro
Kconfig ARM: arm-soc driver changes for 3.10 2013-05-04 12:31:18 -07:00
Makefile ARM: arm-soc driver changes for 3.10 2013-05-04 12:31:18 -07:00