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NFC: trf7970a: Don't turn off RF if its already off

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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>
This commit is contained in:
Mark A. Greer 2014-09-02 15:12:40 -07:00 • committed by Samuel Ortiz
commit cfc708dbe4
1 changed files with 4 additions and 0 deletions
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4
drivers/nfc/trf7970a.c
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@ -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;