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NFC: trf7970a: Only fill FIFO if there is space

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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>
This commit is contained in:
Mark A. Greer 2014-09-02 15:12:29 -07:00 committed by Samuel Ortiz
parent 7a1e5552af
commit 0e840ed59b
1 changed files with 6 additions and 0 deletions
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6
drivers/nfc/trf7970a.c
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@ -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;