public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-05 08:43:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

NFC: trf7970a: Clear possible spurious interrupt before transmitting

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/nfc/trf7970a.c
View file

@ -1120,6 +1120,7 @@ static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev,
char *prefix; char *prefix;
unsigned int len; unsigned int len;
int ret; int ret;
u8 status;
dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
trf->state, timeout, skb->len); 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); 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); ret = trf7970a_transmit(trf, skb, len);
if (ret) { if (ret) {
kfree_skb(trf->rx_skb); kfree_skb(trf->rx_skb);