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Commit aff0564a authored by Mark A. Greer's avatar Mark A. Greer Committed by Samuel Ortiz
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NFC: trf7970a: Clear possible spurious interrupt before transmitting 



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: default avatarMark A. Greer <mgreer@animalcreek.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 38b4eb1f

drivers/nfc/trf7970a.c

+6 −0
Original line number Diff line number Diff line
@@ -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);