Commit 407526d5 authored by Nayna Jain's avatar Nayna Jain Committed by Sasha Levin

tpm: add sleep only for retry in i2c_nuvoton_write_status()

[ Upstream commit 0afb7118 ]

Currently, there is an unnecessary 1 msec delay added in
i2c_nuvoton_write_status() for the successful case. This
function is called multiple times during send() and recv(),
which implies adding multiple extra delays for every TPM
operation.

This patch calls usleep_range() only if retry is to be done.
Signed-off-by: default avatarNayna Jain <nayna@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org (linux-4.8)
Reviewed-by: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 779a9668
......@@ -120,6 +120,7 @@ static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data)
/* this causes the current command to be aborted */
for (i = 0, status = -1; i < TPM_I2C_RETRY_COUNT && status < 0; i++) {
status = i2c_nuvoton_write_buf(client, TPM_STS, 1, &data);
if (status < 0)
usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY
+ TPM_I2C_DELAY_RANGE);
}
......
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