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manjugk manjugk f3083d921d OMAP2/3: I2C: Errata ID i207: Clear wrong RDR interrupt 
Under certain rare conditions, I2C_STAT[13].RDR bit may be set
and the corresponding interrupt fire, even there is no data in
the receive FIFO, or the I2C data transfer is still ongoing.
These spurious RDR events must be ignored by the software.

This patch handles and ignores RDR spurious interrupts.

The below sequence is required in interrupt handler for
handling this errata:
1. If RDR is set to 1, clear RDR
2. Read I2C status register and check for BusBusy bit. If BusBusy
bit is set, skip remaining steps.
3. If BusBusy bit is not set, perform read operation on I2C status
register.
4. If RDR is set, clear the same. Check RDR again and clear if it sets
RDR bit again.
5. Perform I2C Data Read operation N number of times(where N is value
read from the register BUFSTAT-RXSTAT bit fields).

Note:
This errata is not applicable for omap2420 and omap4.
It is applicable for:
1. omap2430
2. omap34xx(including omap3630).

Signed-off-by: Manjunatha GK <manjugk@ti.com>
Cc: Hema Kalliguddi <hemahk@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Aaro Koskinen <Aaro.Koskinen@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2010-05-20 00:18:59 +01:00
..
accessibility
acpi Merge branch 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 09:15:57 -07:00
amba
ata pata_pcmcia / ide-cs: Fix bad hashes for Transcend and kingston IDs 2010-05-05 14:48:48 -04:00
atm
auxdisplay
base Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2010-05-19 11:36:03 -07:00
block Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:17:35 -07:00
bluetooth
cdrom
char Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:35:04 -07:00
clocksource Merge branch 'sh/stable-updates' 2010-04-26 16:08:27 +09:00
connector
cpufreq Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:49:13 -07:00
cpuidle cpuidle: Fix incorrect optimization 2010-05-09 18:35:36 -07:00
crypto
dca
dio
dma Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2010-05-19 11:36:03 -07:00
edac edac, mce: Fix wrong mask and macro usage 2010-04-30 10:15:39 -07:00
eisa
firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2010-04-22 12:54:54 -07:00
firmware Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip 2010-04-07 11:02:23 -07:00
gpio it8761e_gpio: fix bug in gpio numbering 2010-05-11 17:33:41 -07:00
gpu drivers/gpu/drm/i915/i915_irq.c:i915_error_object_create(): use correct kmap-atomic slot 2010-05-11 17:33:42 -07:00
hid HID: fix suspend crash by moving initializations earlier 2010-05-07 23:33:52 +02:00
hwmon Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2010-05-11 17:38:04 -07:00
i2c OMAP2/3: I2C: Errata ID i207: Clear wrong RDR interrupt 2010-05-20 00:18:59 +01:00
ide pata_pcmcia / ide-cs: Fix bad hashes for Transcend and kingston IDs 2010-05-05 14:48:48 -04:00
idle
ieee1394
ieee802154
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2010-04-09 11:53:06 -07:00
input Merge branch 'for-linus/samsung4' of git://git.fluff.org/bjdooks/linux 2010-05-19 11:49:33 -07:00
isdn Fix ISDN/Gigaset build failure 2010-04-19 11:53:17 -07:00
leds
lguest lguest: stop using KVM hypercall mechanism 2010-04-14 21:43:56 +09:30
macintosh device_attributes: add sysfs_attr_init() for dynamic attributes 2010-04-07 08:38:03 -07:00
mca
md md: restore ability of spare drives to spin down. 2010-05-07 21:10:57 +10:00
media V4L/DVB: pxa_camera: move fifo reset direct before dma start 2010-05-06 19:20:52 -03:00
memstick
message
mfd mfd: Clean up after WM83xx AUXADC interrupt if it arrives late 2010-05-13 12:58:55 +02:00
misc Modify the VMware balloon driver for the new x86_hyper API 2010-05-09 01:13:42 -07:00
mmc Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2010-05-19 11:37:22 -07:00
mtd [MTD] Remove zero-length files mtdbdi.c and internal.ho 2010-05-05 15:25:12 -04:00
net m68k: amiga - Zorro bus modalias support 2010-05-17 21:37:41 +02:00
nubus
of of: check for IS_ERR() 2010-04-28 01:07:29 -06:00
oprofile oprofile: protect from not being in an IRQ context 2010-05-03 23:02:39 +02:00
parisc
parport
pci Merge branch 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 07:22:37 -07:00
pcmcia [ARM] pxa: add support for Voipac PXA270 PCMCIA 2010-05-11 17:25:02 +02:00
platform eeepc-laptop: add missing sparse_keymap_free 2010-04-23 15:23:21 -04:00
pnp Merge branches 'bugzilla-14337', 'bugzilla-14998', 'bugzilla-15407', 'bugzilla-15903' and 'misc-2.6.34' into release 2010-05-06 22:04:31 -04:00
power
pps
ps3
rapidio
regulator regulator: fix enabling regulator issue on max8925 2010-04-28 15:24:34 +01:00
rtc Revert "rtc: omap: let device wakeup capability be configured from chip init logic" 2010-05-19 11:37:20 -07:00
s390 [S390] drivers/s390/char: Use kmemdup 2010-05-17 10:00:18 +02:00
sbus
scsi m68k: amiga - Zorro bus modalias support 2010-05-17 21:37:41 +02:00
serial Merge branch 'for-linus/samsung4' of git://git.fluff.org/bjdooks/linux 2010-05-19 11:49:33 -07:00
sfi
sh sh: simplify WARN usage in SH clock driver 2010-05-13 17:43:11 +09:00
sn
spi [ARM] pxa: add namespace on ssp 2010-05-11 17:25:06 +02:00
ssb MIPS: Fix SSB PCIcore IO resource management 2010-04-12 17:26:14 +01:00
staging Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus 2010-04-30 13:04:14 -07:00
tc
telephony
thermal drivers/thermal/thermal_sys.c: fix 'key f70f4b50 not in .data' in thermal_sys 2010-04-07 08:38:03 -07:00
uio
usb Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2010-05-19 11:37:22 -07:00
uwb
vhost vhost: fix barrier pairing 2010-05-12 18:04:04 +03:00
video m68k: amiga - Frame buffer platform device conversion 2010-05-17 21:37:43 +02:00
virtio virtio: Fix GFP flags passed from the virtio balloon driver 2010-04-22 07:34:05 -07:00
vlynq
w1 w1: fix omap 1-wire driver compilation 2010-04-24 11:31:25 -07:00
watchdog ARM: 6126/1: ARM mpcore_wdt: fix build failure and other fixes 2010-05-12 11:18:14 +01:00
xen stop_machine: reimplement using cpu_stop 2010-05-06 18:49:20 +02:00
zorro m68k: amiga - Zorro host bridge platform device conversion 2010-05-17 21:37:42 +02:00
Kconfig
Makefile virtio: initialize earlier 2010-05-07 14:01:17 -07:00