Commit 0e840ed5 authored Sep 02, 2014 by Mark A. Greer Committed by Samuel Ortiz Sep 07, 2014

NFC: trf7970a: Only fill FIFO if there is space



Handle the case where trf7970a_fill_fifo() is
called but there is no room in the FIFO for
more TX data.  When this happens, wait for
another interrupt indicating that there is
now space (and set a timer in case that
interrupt never occurs).

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

parent 7a1e5552

drivers/nfc/trf7970a.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -580,6 +580,12 @@ static void trf7970a_fill_fifo(struct trf7970a *trf)

		/* Calculate how much more data can be written to the fifo */
		len = TRF7970A_FIFO_SIZE - fifo_bytes;
		if (!len) {
		schedule_delayed_work(&trf->timeout_work,
		msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT));
		return;
		}

		len = min(skb->len, len);

		prefix = TRF7970A_CMD_BIT_CONTINUOUS \| TRF7970A_FIFO_IO_REGISTER;