NFC: trf7970a: Reset FIFO when 'End of TX' Interrupt Occurs

Sometimes after sending a frame there is tx data leftover in the FIFO
which the driver will think is part of the receive frame. That data can
be cleared when an 'End of TX' interrupt is received by issuing the
'FIFO Reset' command.

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

diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index df63449..a2e0a21 100644 (file)
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -681,7 +681,9 @@ static irqreturn_t trf7970a_irq(int irq, void *dev_id)
                        trf->ignore_timeout =
                                !cancel_delayed_work(&trf->timeout_work);
                        trf7970a_drain_fifo(trf, status);
-               } else if (!(status & TRF7970A_IRQ_STATUS_TX)) {
+               } else if (status == TRF7970A_IRQ_STATUS_TX) {
+                       trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
+               } else {
                        trf7970a_send_err_upstream(trf, -EIO);
                }
                break;