tree 4c08894e72fa0a94d71365391ac9d8db226795f6
parent 72c96a6802d9b1c949785d1d152f8bc8666c753d
author John Schmoller <jschmoller@xes-inc.com> 1291311790 -0600
committer Kumar Gala <galak@kernel.crashing.org> 1292254335 -0600

fsl_upm: Add MxMR/MDR synchronization

According to Freescale reference manuals (eg section "13.4.4.2
Programming the UPMs" of the P4080 Reference Manual):

"Since the result of any update to the MxMR/MDR register must be in
effect before the dummy read or write to the UPM region, a write to
MxMR/MDR should be followed immediately by a read of MxMR/MDR."

The UPM on a custom P4080-based board did not work without performing
a read of MxMR/MDR after a write.

Signed-off-by: John Schmoller <jschmoller@xes-inc.com>
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>