From 4dd836e46c3ddcb2020646c867be589658440be0 Mon Sep 17 00:00:00 2001 From: "Mark A. Greer" Date: Tue, 25 Mar 2014 08:54:32 -0700 Subject: [PATCH] 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 Signed-off-by: Samuel Ortiz --- drivers/nfc/trf7970a.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index df634498c81b..a2e0a21d6ea2 100644 --- 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; -- 2.20.1