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| author |   Christophe RICARD <christophe.ricard@gmail.com> | 2016-02-13 16:15:30 +0100 |
|---|---|---|
| committer |   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2016-06-25 17:21:42 +0300 |
| commit | 10460bc1cfdea19dbab2289a63b4be0c874d29f2 (patch) | |
| tree | d44fbb0fecbebe96104d84425f46321ac131f0ff | |
| parent | tpm/st33zp24: Auto-select core module (diff) | |
| download | linux-dev-10460bc1cfdea19dbab2289a63b4be0c874d29f2.tar.xz linux-dev-10460bc1cfdea19dbab2289a63b4be0c874d29f2.zip | |
tpm/st33zp24/spi: Improve st33zp24_spi_evaluate_latency
Add check in st33zp24_spi_evaluate_latency helping to diagnose if the chip
is present or in a bad state.
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
| -rw-r--r-- | drivers/char/tpm/st33zp24/spi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/tpm/st33zp24/spi.c b/drivers/char/tpm/st33zp24/spi.c index 08e6bf54d7dd..a2ef8ec4ba80 100644 --- a/drivers/char/tpm/st33zp24/spi.c +++ b/drivers/char/tpm/st33zp24/spi.c @@ -214,6 +214,11 @@ static int st33zp24_spi_evaluate_latency(void *phy_id) &data, 1); latency++; } + if (status < 0) + return status; + if (latency == MAX_SPI_LATENCY) + return -ENODEV; + return latency - 1; } /* evaluate_latency() */ |