linux/drivers/i2c
Alexander Kochetkov ccfc866356 i2c: omap: fix i207 errata handling
commit 6d9939f651 (i2c: omap: split out [XR]DR
and [XR]RDY) changed the way how errata i207 (I2C: RDR Flag May Be Incorrectly
Set) get handled. 6d9939f651 code doesn't correspond to workaround provided by
errata.

According to errata ISR must filter out spurious RDR before data read not after.
ISR must read RXSTAT to get number of bytes available to read. Because RDR
could be set while there could no data in the receive FIFO.

Restored pre 6d9939f651 way of handling errata.

Found by code review. Real impact haven't seen.
Tested on Beagleboard XM C.

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Fixes: 6d9939f651 i2c: omap: split out [XR]DR and [XR]RDY
Tested-by: Felipe Balbi <balbi@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-11-22 22:07:40 +01:00
..
algos i2c: remove FSF address 2014-11-07 18:35:33 +01:00
busses i2c: omap: fix i207 errata handling 2014-11-22 22:07:40 +01:00
muxes Merge branch 'i2c/for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2014-08-09 09:15:07 -07:00
i2c-boardinfo.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-core.c i2c: core: Dispose OF IRQ mapping at client removal time 2014-11-07 19:03:18 +01:00
i2c-core.h i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-dev.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-mux.c i2c: mux: Inherit retry count and timeout from parent for muxed bus 2013-12-12 22:39:28 +01:00
i2c-smbus.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-stub.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
Kconfig i2c: rework kernel config I2C_ACPI 2014-08-19 10:19:39 -05:00
Makefile i2c: move acpi code back into the core 2014-09-25 16:07:15 +02:00