NFC: trf7970a: Don't turn off RF if its already off
Don't try to turn off of RF transmitter is its
already off.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index e4671e5..429146b 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -859,6 +859,10 @@
static void trf7970a_switch_rf_off(struct trf7970a *trf)
{
+ if ((trf->state == TRF7970A_ST_PWR_OFF) ||
+ (trf->state == TRF7970A_ST_RF_OFF))
+ return;
+
dev_dbg(trf->dev, "Switching rf off\n");
trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;