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>

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index f243e75d28f31198a19ad7442aa4159595088622..7612d89850ddf55566ac5bacbb3dae7111ea965a 100644 (file)
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -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);