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Mark Brown 320549a224 regmap: mmio: Revert to v4.4 endianness handling 
Commit 29bb45f25f (regmap-mmio: Use native endianness for read/write)
attempted to fix some long standing bugs in the MMIO implementation for
big endian systems caused by duplicate byte swapping in both regmap and
readl()/writel() which affected MIPS systems as when they are in big
endian mode they flip the endianness of all registers in the system, not
just the CPU.  MIPS systems had worked around this by declaring regmap
using IPs as little endian which is inaccurate, unfortunately the issue
had not been reported.

Sadly the fix makes things worse rather than better.  By changing the
behaviour to match the documentation it caused behaviour changes for
other IPs which broke them and by using the __raw I/O accessors to avoid
the endianness swapping in readl()/writel() it removed some memory
ordering guarantees and could potentially generate unvirtualisable
instructions on some architectures.

Unfortunately sorting out all this mess in any half way sensible fashion
was far too invasive to go in during an -rc cycle so instead let's go
back to the old broken behaviour for v4.5, the better fixes are already
queued for v4.6.  This does mean that we keep the broken MIPS DTs for
another release but that seems the least bad way of handling the
situation.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
 		2016-02-05 11:22:04 +00:00
..
Kconfig regmap: ac97: Add generic AC'97 callbacks 2014-11-19 10:28:14 +00:00
Makefile regmap: Move tracing header into drivers/base/regmap 2015-03-19 22:22:45 +00:00
internal.h driver core update for 4.4-rc1 2015-11-04 21:50:37 -08:00
regcache-flat.c regmap: replace kzalloc with kcalloc 2015-11-20 12:27:57 +00:00
regcache-lzo.c regmap: replace kmalloc with kmalloc_array 2015-11-20 12:27:59 +00:00
regcache-rbtree.c Merge remote-tracking branches 'regmap/topic/mmio', 'regmap/topic/rbtree' and 'regmap/topic/seq' into regmap-next 2016-01-05 19:07:18 +00:00
regcache.c Merge remote-tracking branches 'regmap/topic/64bit' and 'regmap/topic/irq-type' into regmap-next 2016-01-05 19:07:17 +00:00
regmap-ac97.c regmap: Move documentation to regmap.h 2015-08-11 17:21:44 +01:00
regmap-debugfs.c regmap: debugfs: Use seq_file for the access map 2016-01-05 18:32:22 +00:00
regmap-i2c.c Merge remote-tracking branches 'regmap/topic/lockdep' and 'regmap/topic/seq-delay' into regmap-next 2015-09-04 17:22:10 +01:00
regmap-irq.c Merge remote-tracking branches 'regmap/topic/64bit' and 'regmap/topic/irq-type' into regmap-next 2016-01-05 19:07:17 +00:00
regmap-mmio.c regmap: mmio: Revert to v4.4 endianness handling 2016-02-05 11:22:04 +00:00
regmap-spi.c regmap: Move documentation to regmap.h 2015-08-11 17:21:44 +01:00
regmap-spmi.c regmap: Move documentation to regmap.h 2015-08-11 17:21:44 +01:00
regmap.c Merge remote-tracking branches 'regmap/topic/64bit' and 'regmap/topic/irq-type' into regmap-next 2016-01-05 19:07:17 +00:00
trace.h regmap: Move tracing header into drivers/base/regmap 2015-03-19 22:22:45 +00:00