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NFC: trf7970a: Clear possible spurious interrupt before transmitting

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The trf7970a occasionally generates spurious interrupts
which can confuse the driver.  To help alleviate this,
clear any interrupts by reading the 'IRQ Status Register'
before starting a new transaction.

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 15:12:26 -07:00 committed by Samuel Ortiz
parent 38b4eb1f7f
commit aff0564aa7
1 changed files with 6 additions and 0 deletions
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6
drivers/nfc/trf7970a.c
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@ -1120,6 +1120,7 @@ static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev,
char *prefix;
unsigned int len;
int ret;
u8 status;
dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
trf->state, timeout, skb->len);
@ -1195,6 +1196,11 @@ static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev,
len = min_t(int, skb->len, TRF7970A_FIFO_SIZE);
/* Clear possible spurious interrupt */
ret = trf7970a_read_irqstatus(trf, &status);
if (ret)
goto out_err;
ret = trf7970a_transmit(trf, skb, len);
if (ret) {
kfree_skb(trf->rx_skb);