Commit ee5067c6 authored by Peter Rosin's avatar Peter Rosin Committed by Greg Kroah-Hartman

tpm/tpm_i2c_infineon: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT)

[ Upstream commit bb853aac ]

Locking the root adapter for __i2c_transfer will deadlock if the
device sits behind a mux-locked I2C mux. Switch to the finer-grained
i2c_lock_bus with the I2C_LOCK_SEGMENT flag. If the device does not
sit behind a mux-locked mux, the two locking variants are equivalent.
Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: default avatarAlexander Steffen <Alexander.Steffen@infineon.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cf503dbe
......@@ -117,7 +117,7 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
/* Lock the adapter for the duration of the whole sequence. */
if (!tpm_dev.client->adapter->algo->master_xfer)
return -EOPNOTSUPP;
i2c_lock_adapter(tpm_dev.client->adapter);
i2c_lock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT);
if (tpm_dev.chip_type == SLB9645) {
/* use a combined read for newer chips
......@@ -192,7 +192,7 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
}
out:
i2c_unlock_adapter(tpm_dev.client->adapter);
i2c_unlock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT);
/* take care of 'guard time' */
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
......@@ -224,7 +224,7 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
if (!tpm_dev.client->adapter->algo->master_xfer)
return -EOPNOTSUPP;
i2c_lock_adapter(tpm_dev.client->adapter);
i2c_lock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT);
/* prepend the 'register address' to the buffer */
tpm_dev.buf[0] = addr;
......@@ -243,7 +243,7 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
usleep_range(sleep_low, sleep_hi);
}
i2c_unlock_adapter(tpm_dev.client->adapter);
i2c_unlock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT);
/* take care of 'guard time' */
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
......
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