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i2c: npcm7xx: Fix timeout calculation

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timeout_usec value calculation was wrong, the calculated value
was in msec instead of usec.

Fixes: 56a1485b10 ("i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver")
Signed-off-by: Tali Perry <tali.perry1@gmail.com>
Reviewed-by: Avi Fishman <avifishman70@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Alex Qiu <xqiu@google.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Tali Perry 2020-08-31 00:31:21 +03:00 committed by Wolfram Sang
parent f4d51dffc6
commit 06be67266a
1 changed files with 6 additions and 2 deletions
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8
drivers/i2c/busses/i2c-npcm7xx.c
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@ -2093,8 +2093,12 @@ static int npcm_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
} }
} }
/* Adaptive TimeOut: astimated time in usec + 100% margin */ /*
timeout_usec = (2 * 10000 / bus->bus_freq) * (2 + nread + nwrite); * Adaptive TimeOut: estimated time in usec + 100% margin:
* 2: double the timeout for clock stretching case
* 9: bits per transaction (including the ack/nack)
*/
timeout_usec = (2 * 9 * USEC_PER_SEC / bus->bus_freq) * (2 + nread + nwrite);
timeout = max(msecs_to_jiffies(35), usecs_to_jiffies(timeout_usec)); timeout = max(msecs_to_jiffies(35), usecs_to_jiffies(timeout_usec));
if (nwrite >= 32 * 1024 || nread >= 32 * 1024) { if (nwrite >= 32 * 1024 || nread >= 32 * 1024) {
dev_err(bus->dev, "i2c%d buffer too big\n", bus->num); dev_err(bus->dev, "i2c%d buffer too big\n", bus->num);