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mfd: tps65910: Work around silicon erratum SWCZ010 

http://www.ti.com/lit/pdf/SWCZ010:
  Glitch on SDA-SCL not managed correctly by the I2C IP

Impact:
The standard specifies that the I2C transfer should restart on a start
event in all cases. The current design does not support two consecutive
Start conditions. This can cause the first real access after such a
glitch to be corrupted.

Description:
An unexpected glitch on SDA and SCL can generate a wrong start event.
In the current design, the SCL line must toggle two times to detect a
new start event and completely restart the I2C access; hence the real
start event is not detected in the case of a single SCL toggle.

Workaround:
Repeat I2C access.

A simpler workaround is to make a dummy transfer just before the first
access to the tps65910 chip. This can be done unconditionally.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
hifive-unleashed-5.1
Arnout Vandecappelle (Essensium/Mind) 2014-08-22 17:30:56 +02:00 committed by Lee Jones
parent dfa52c852d
commit be1c770028
1 changed files with 5 additions and 0 deletions
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5
drivers/mfd/tps65910.c
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@ -486,6 +486,11 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
tps65910->i2c_client = i2c;
tps65910->id = chip_id;
/* Work around silicon erratum SWCZ010: the tps65910 may miss the
* first I2C transfer. So issue a dummy transfer before the first
* real transfer.
*/
i2c_master_send(i2c, "", 1);
tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
if (IS_ERR(tps65910->regmap)) {
ret = PTR_ERR(tps65910->regmap);