Simon Glass 069a9502dd i2c: s3c2410: Leave the bus disabled unless it is in use ... There is a rather odd feature of the exynos i2c controller that if it is left enabled, it can lock itself up with the clk line held low. This makes the bus unusable. Unfortunately, the s3c24xx_i2c_set_master() function does not notice this, and reports a timeout. From then on the bus cannot be used until the AP is rebooted. The problem happens when any sort of interrupt occurs (e.g. due to a bus transition) when we are not in the middle of a transaction. We have seen many instances of this when U-Boot leaves the bus apparently happy, but Linux cannot access it. The current code is therefore pretty fragile. This fixes things by leaving the bus disabled unless we are actually in a transaction. We enable the bus at the start of the transaction and disable it at the end. That way we won't get interrupts and will not lock up the bus. It might be possible to clear pending interrupts on start-up, but this seems to be a more robust solution. We can't service interrupts when we are not in a transaction, and anyway would rather not lock up the bus while we try. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>		2014-03-12 20:45:17 +01:00
..
accessibility
acpi	Merge branches 'acpi-pm' and 'acpi-video'	2014-02-21 01:28:12 +01:00
amba
ata	PCI updates for v3.14:	2014-02-20 12:46:24 -08:00
atm
auxdisplay
base	Small dma-buf pull request for 3.14	2014-02-17 12:42:45 -08:00
bcma	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2014-01-30 17:20:32 -08:00
block	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2014-02-14 10:45:18 -08:00
bluetooth
bus	drivers: bus: fix CCI driver kcalloc call parameters swap	2014-01-31 15:15:13 -08:00
cdrom	Merge branch 'for-3.14/drivers' of git://git.kernel.dk/linux-block	2014-01-30 11:40:10 -08:00
char	Char/Misc fixes for 3.14-rc3	2014-02-14 16:13:00 -08:00
clk	The second half of the clock framework pull requeust for 3.14 is	2014-01-28 18:44:53 -08:00
clocksource	clocksource: Kona: Print warning rather than panic	2014-02-06 16:01:40 +01:00
connector
cpufreq	intel_pstate: Add support for Baytrail turbo P states	2014-02-21 01:22:40 +01:00
cpuidle	powerpc/powernv/cpuidle: Back-end cpuidle driver for powernv platform.	2014-01-29 17:02:24 +11:00
crypto	crypto/nx/nx-842: Fix handling of vmalloc addresses	2014-02-11 11:24:49 +11:00
dca
devfreq	Merge branches 'pm-cpufreq' and 'pm-devfreq'	2014-01-29 11:48:23 +01:00
dio
dma	dma: mv_xor: Silence a bunch of LPAE-related warnings	2014-02-12 16:21:17 -08:00
edac	EDAC: Correct workqueue setup path	2014-02-14 10:40:47 +01:00
eisa	Revert "EISA: Initialize device before its resources"	2014-01-17 14:57:29 -07:00
extcon
firewire	firewire: Enable remote DMA above 4 GB	2014-01-20 01:11:13 +01:00
firmware	firmware/google: drop 'select EFI' to avoid recursive dependency	2014-01-27 21:02:40 -08:00
fmc
gpio	gpio: tb10x: GPIO_TB10X needs to select GENERIC_IRQ_CHIP	2014-02-05 11:13:59 +01:00
gpu	ACPI and power management fixes for 3.14-rc4	2014-02-21 10:01:17 -08:00
hid	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid	2014-02-18 16:29:46 -08:00
hsi
hv	Drivers: hv: vmbus: Don't timeout during the initial connection with host	2014-02-07 08:27:34 -08:00
hwmon	hwmon: (max1668) Fix writing the minimum temperature	2014-02-18 15:53:49 -08:00
hwspinlock
i2c	i2c: s3c2410: Leave the bus disabled unless it is in use	2014-03-12 20:45:17 +01:00
ide	drivers: ide: Include appropriate header file in ide-pio-blacklist.c	2014-01-28 23:35:09 -08:00
idle	ACPI and power management updates for 3.14-rc1	2014-01-24 15:51:02 -08:00
iio	iio: max1363: Use devm_regulator_get_optional for optional regulator	2014-02-08 11:46:00 +00:00
infiniband	Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2014-02-15 16:18:47 -08:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2014-01-24 17:17:30 -08:00
iommu	arm/smmu: Use irqsafe spinlock for domain lock	2014-02-20 13:04:47 +01:00
ipack
irqchip	irqchip mvebu fixes for v3.14	2014-02-21 23:57:33 +01:00
isdn	isdn/hisax: hex vs decimal typo in prfeatureind()	2014-02-06 21:18:06 -08:00
leds	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds	2014-01-28 18:53:01 -08:00
lguest
macintosh	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2014-01-27 21:11:26 -08:00
mailbox	drivers/mailbox/omap: make mbox->irq signed for error handling	2014-01-23 16:36:53 -08:00
md	Two bugfixes for md	2014-02-14 12:48:16 -08:00
media	[media] adv7842: Composite free-run platfrom-data fix	2014-02-04 06:46:10 -02:00
memory
memstick	drivers/memstick/host/rtsx_pci_ms.c: fix ms card data transfer bug	2014-01-23 16:37:04 -08:00
message	drivers/message/i2o/i2o_config.c: fix deadlock in compat_ioctl(I2OGETIOPS)	2014-02-10 16:01:40 -08:00
mfd	sound fixes for 3.14-rc4	2014-02-21 09:55:32 -08:00
misc	mei: set client's read_cb to NULL when flow control fails	2014-02-18 10:07:36 -08:00
mmc	Fix uses of dma_max_pfn() when converting to a limiting address	2014-02-17 23:08:41 +00:00
mtd	* Improve the NOR erasure quirk - now it tries to do as little writes as	2014-01-30 20:04:09 -08:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-02-18 15:52:43 -08:00
nfc
ntb
nubus
of	Device tree compatible match order bug fix	2014-02-21 14:35:05 -08:00
oprofile
parisc
parport	TTY/Serial driver patches for 3.14-rc1	2014-01-20 16:05:23 -08:00
pci	PCI updates for v3.14:	2014-02-20 12:46:24 -08:00
pcmcia	PCI changes for the v3.14 merge window:	2014-01-22 16:39:28 -08:00
phy	phy: let phy_provider_register be the last step in registering PHY	2014-02-18 12:13:16 -08:00
pinctrl	pinctrl: tegra: return correct error type	2014-02-06 14:21:19 +01:00
platform	platform/chrome: Cleanups and improvements	2014-01-29 20:06:01 -08:00
pnp
power	Few fixes:	2014-02-14 10:32:28 -08:00
powercap
pps
ps3
ptp	ptp_pch: Add dependency on HAS_IOMEM	2014-01-15 14:51:22 -08:00
pwm	pwm: Changes for v3.14-rc1	2014-01-27 08:15:51 -08:00
rapidio
regulator	Merge remote-tracking branches 'regulator/fix/da9063', 'regulator/fix/max14577' and 'regulator/fix/s5m8767' into regulator-linus	2014-02-23 12:22:18 +09:00
remoteproc
reset
rpmsg
rtc	Merge branch 'akpm' (incoming from Andrew)	2014-01-23 19:11:50 -08:00
s390	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2014-02-11 12:23:50 -08:00
sbus	Sparc: sparc_cpu_model isn't in asm/system.h any more [ver #2]	2014-02-20 13:34:11 -05:00
scsi	Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm	2014-02-18 15:49:58 -08:00
sfi
sh
sn
spi	Merge remote-tracking branches 'spi/fix/doc', 'spi/fix/nuc900' and 'spi/fix/rspi' into spi-linus	2014-02-11 12:08:27 +00:00
ssb	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2014-01-30 17:20:32 -08:00
staging	Staging tree fix for 3.14-rc4	2014-02-23 10:39:21 -08:00
target	Target/sbc: Fix protection copy routine	2014-02-12 15:14:45 -08:00
tc
thermal	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2014-01-24 17:13:49 -08:00
tty	Revert "tty: Set correct tty name in 'active' sysfs attribute"	2014-02-22 14:31:04 -08:00
uio
usb	usb: chipidea: need to mask when writting endptflush and endptprime	2014-02-21 12:34:45 -08:00
uwb
vfio	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2014-01-27 21:11:26 -08:00
vhost	vhost: fix a theoretical race in device cleanup	2014-02-13 18:47:30 -05:00
video	video: Kconfig: Allow more broad selection of the imxfb framebuffer driver.	2014-02-14 10:44:52 +02:00
virt
virtio	A few simple fixes. Quiet cycle.	2014-01-22 22:24:35 -08:00
vlynq	drivers/vlynq/vlynq.c: fix another resource size off by 1 error	2014-01-23 16:36:55 -08:00
vme	VME: Correct read/write alignment algorithm	2014-02-07 08:16:14 -08:00
w1	drivers/w1/masters/w1-gpio.c: add strong pullup emulation	2014-01-23 16:37:04 -08:00
watchdog	watchdog: w83697hf_wdt: return ENODEV if no device was found	2014-02-21 20:36:46 +01:00
xen	Bug-fix:	2014-02-12 12:28:05 -08:00
zorro
Kconfig
Makefile