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tpm/st33zp24/spi: Improve st33zp24_spi_evaluate_latency

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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>
This commit is contained in:
Christophe RICARD 2016-02-13 16:15:30 +01:00 committed by Jarkko Sakkinen
parent 300796cdb5
commit 4ef2aa3c1b
1 changed files with 5 additions and 0 deletions
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5
drivers/char/tpm/st33zp24/spi.c
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@ -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() */