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Commit 10460bc1 authored by Christophe Ricard's avatar Christophe Ricard Committed by Jarkko Sakkinen
Browse files

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: default avatarChristophe Ricard <christophe-h.ricard@st.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
parent b55c8e9f

drivers/char/tpm/st33zp24/spi.c

+5 −0
Original line number Diff line number Diff line
@@ -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() */