From: Sonic Zhang <sonic.zhang@analog.com>
Date: Thu, 11 Jun 2009 12:42:57 +0000 (+0100)
Subject: Blackfin Serial Driver: handle irregular DMA register status in auto start mode
X-Git-Tag: v2.6.31-rc1~399^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35ff69357949cfff5c3d8e3038b77146872e3bd3;p=pandora-kernel.git

Blackfin Serial Driver: handle irregular DMA register status in auto start mode

This bug is caused by irregular behavior of DMA register CURR_X_COUNT
and CURR_Y_COUNT when an auto restart uart rx DMA run to last byte in
DMA buffer, trigger the interrupt and stay at this possiton. The status
of current x and y is 0:7 instead of 512:8 or 0:8. The driver doesn't
take care of this case when calculating the position.

URL: http://blackfin.uclinux.org/gf/tracker/5063
Reported-by: Tomasz Motylewski <t.motylewski@bfad.de>

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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