tree 6ac60b17bcda0b575d3cd39d7625882fb6d1e138
parent 0e840ed59ba79670b66bba8c1d50b6f67e72d3fb
author Mark A. Greer <mgreer@animalcreek.com> 1409695950 -0700
committer Samuel Ortiz <sameo@linux.intel.com> 1410124424 +0200

NFC: trf7970a: Handle low-watermark IRQ when transmitting

Commit 4dd836e46c3d ("NFC: trf7970a: Reset FIFO when
'End of TX' Interrupt Occurs") fixes the issue that
it was meant to fix but adds the unfortunate side
effect of causing the driver to report an error
when the TX low-watermark level is passed during
transmits.  This can be fixed by checking whether
the IRQ status indicates that the low-watermark
has been passed when transmitting.  If it has been
passed and the FIFO is empty, then its safe to reset
the FIFO.  Otherwise, silently continue since another
TX interrupt will be generated and the FIFO will be
reset then.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>