Andrew Jeffery 57c99b5a08 fsi: core: Fix small accesses and unaligned offsets via sysfs ... [ Upstream commit 9f4c2b516b ] Subtracting the offset delta from four-byte alignment lead to wrapping of the requested length where `count` is less than `off`. Generalise the length handling to enable and optimise aligned access sizes for all offset and size combinations. The new formula produces the following results for given offset and count values: offset count | length --------------+------- 0 1 | 1 0 2 | 2 0 3 | 2 0 4 | 4 0 5 | 4 1 1 | 1 1 2 | 1 1 3 | 1 1 4 | 1 1 5 | 1 2 1 | 1 2 2 | 2 2 3 | 2 2 4 | 2 2 5 | 2 3 1 | 1 3 2 | 1 3 3 | 1 3 4 | 1 3 5 | 1 We might need something like this for the cfam chardevs as well, for example we don't currently implement any alignment restrictions / handling in the hardware master driver. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-6-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-12-31 12:37:35 +01:00
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fsi-core.c	fsi: core: Fix small accesses and unaligned offsets via sysfs	2019-12-31 12:37:35 +01:00
fsi-master-gpio.c	drivers/fsi: Use asynchronous slave mode	2017-06-09 11:52:09 +02:00
fsi-master-hub.c	drivers/fsi: Add hub master support	2017-06-09 11:52:09 +02:00
fsi-master.h	drivers/fsi: Use asynchronous slave mode	2017-06-09 11:52:09 +02:00
fsi-scom.c	drivers/fsi/scom: Remove reset before every putscom	2017-08-28 17:15:16 +02:00
Kconfig	drivers/fsi: Add hub master support	2017-06-09 11:52:09 +02:00
Makefile	drivers/fsi: Add hub master support	2017-06-09 11:52:09 +02:00