https://github.com/torvalds/linux
Revision 57c5c28dbc835c67a9c23912bab56b7f165e7715 authored by Eero Nurkkala on 29 July 2009, 22:02:12 UTC, committed by Linus Torvalds on 30 July 2009, 02:10:35 UTC
When data is read through DMA, the last element must be read separately
through the RX register.  It cannot be transferred by the DMA.  For
further details see e.g.  OMAP35x TRM (table 19-16).

Without the fix the driver causes extra clocks to be clocked to the bus
after DMA RX operations.  This can cause interesting behaviour with some
devices.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com>
[aaro.koskinen@nokia.com: Simplified the patch while keeping the idea.]
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent ddb2219
History
Tip revision: 57c5c28dbc835c67a9c23912bab56b7f165e7715 authored by Eero Nurkkala on 29 July 2009, 22:02:12 UTC
spi: omap2_mcspi rxdma bugfix
Tip revision: 57c5c28
File Mode Size
Documentation
arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 952 bytes
.mailmap -rw-r--r-- 3.9 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 91.7 KB
Kbuild -rw-r--r-- 2.4 KB
MAINTAINERS -rw-r--r-- 149.3 KB
Makefile -rw-r--r-- 53.9 KB
README -rw-r--r-- 17.0 KB
REPORTING-BUGS -rw-r--r-- 3.1 KB

README

back to top