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NFC: trf7970a: Don't turn off RF if its already off
[firefly-linux-kernel-4.4.55.git]
/
drivers
/
nfc
/
trf7970a.c
diff --git
a/drivers/nfc/trf7970a.c
b/drivers/nfc/trf7970a.c
index e4671e54424a375c717ac0539ffb54f15896f925..429146b7e6d8aa7817418ab7a836203cb4e4c67d 100644
(file)
--- a/
drivers/nfc/trf7970a.c
+++ b/
drivers/nfc/trf7970a.c
@@
-859,6
+859,10
@@
err_out:
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;