Axel Lin dbd7e1896a pxa3xx: fix ns2cycle equation ... commit 93b352fce6 upstream. Test on a PXA310 platform with Samsung K9F2G08X0B NAND flash, with tCH=5 and clk is 156MHz, ns2cycle(5, 156000000) returns -1. ns2cycle returns negtive value will break NDTR0_tXX macros. After checking the commit log, I found the problem is introduced by commit 5b0d4d7c8a "[MTD] [NAND] pxa3xx: convert from ns to clock ticks more accurately" To get num of clock cycles, we use below equation: num of clock cycles = time (ns) / one clock cycle (ns) + 1 We need to add 1 cycle here because integer division will truncate the result. It is possible the developers set the Min values in SPEC for timing settings. Thus the truncate may cause problem, and it is safe to add an extra cycle here. The various fields in NDTR{01} are in units of clock ticks minus one, thus we should subtract 1 cycle then. Thus the correct equation should be: num of clock cycles = time (ns) / one clock cycle (ns) + 1 - 1 = time (ns) / one clock cycle (ns) Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Lei Wen <leiwen@marvell.com> Acked-by: Eric Miao <eric.y.miao@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2010-08-26 16:41:42 -07:00
..
chips	mtd: jedec_probe: add PSD4256G6V id	2009-09-23 00:07:00 -07:00
devices	headers: remove sched.h from interrupt.h	2009-10-11 11:20:58 -07:00
lpddr
maps	ARM: Fix warning in sa1100-flash.c	2009-11-16 16:13:35 +00:00
nand	pxa3xx: fix ns2cycle equation	2010-08-26 16:41:42 -07:00
onenand	mtd: onenand: make onenand/generic.c more generic	2009-09-19 11:07:50 -07:00
tests
ubi	UBI: fix volume creation input checking	2010-02-09 04:50:45 -08:00
afs.c
ar7part.c
cmdlinepart.c
ftl.c	trivial: mtd: add __init/__exit macros to init/exitfunctions	2009-09-21 15:14:53 +02:00
inftlcore.c	mtd: inftl: fix fold chain block number	2009-09-19 14:17:35 -07:00
inftlmount.c
internal.h
Kconfig	Merge branch 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze	2009-09-24 09:01:44 -07:00
Makefile
mtd_blkdevs.c	block: use normal I/O path for discard requests	2009-10-01 21:19:30 +02:00
mtdbdi.c
mtdblock_ro.c
mtdblock.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	2009-09-20 05:55:36 -07:00
mtdchar.c
mtdconcat.c	mtd: mtdconcat: prevent a read from eraseregions[-1]	2009-09-19 11:18:46 -07:00
mtdcore.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	2009-09-20 05:55:36 -07:00
mtdcore.h
mtdoops.c
mtdpart.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	2009-09-20 05:55:36 -07:00
mtdsuper.c
nftlcore.c
nftlmount.c
ofpart.c	mtd: ofpart: Check availability of reg property instead of name property	2009-09-19 14:14:48 -07:00
redboot.c
rfd_ftl.c
ssfdc.c