diff options
| author | Mark A. Greer <mgreer@animalcreek.com> | 2014-03-25 08:54:31 -0700 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2014-04-22 00:37:27 +0200 |
| commit | b887eb09d3cbda145d9fff4b9a56c384edd07ed7 (patch) | |
| tree | e0d86dbf37df10cf8c6679a1b5076ca4b825e2d3 /drivers/nfc | |
| parent | 5876bc75e2d3174cd1cd944ee33edc77cd1173ca (diff) | |
| download | linux-b887eb09d3cbda145d9fff4b9a56c384edd07ed7.tar.bz2 | |
NFC: trf7970a: Clear 'NFC Target Detection Level' register
Due to a trf7970a erratum, the 'NFC Target Detection Level' register
(0x18) must be cleared after power-up.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/trf7970a.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index cab302ce2c7e..df634498c81b 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -757,6 +757,11 @@ static int trf7970a_init(struct trf7970a *trf) if (ret) goto err_out; + /* Must clear NFC Target Detection Level reg due to erratum */ + ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); + if (ret) + goto err_out; + ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, TRF7970A_MODULATOR_DEPTH_OOK); if (ret) |