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| author | Eric Nelson <eric.nelson@boundarydevices.com> | 2015-01-30 14:07:55 -0700 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-02-03 13:08:41 +0000 |
| commit | 58cc9c9a175885bbf6bae3acf18233d0a8229a84 (patch) | |
| tree | 4d65ef4a48db605d32b2dc4013e6236a59b1ba5f | |
| parent | 9ee802ec5b1ae0ee468b6acf1bf489347997893b (diff) | |
| download | linux-58cc9c9a175885bbf6bae3acf18233d0a8229a84.tar.gz linux-58cc9c9a175885bbf6bae3acf18233d0a8229a84.tar.bz2 linux-58cc9c9a175885bbf6bae3acf18233d0a8229a84.zip | |
ASoC: sgtl5000: add delay before first I2C access
To quote from section 1.3.1 of the data sheet:
The SGTL5000 has an internal reset that is deasserted
8 SYS_MCLK cycles after all power rails have been brought
up. After this time, communication can start
...
1.0us represents 8 SYS_MCLK cycles at the minimum 8.0 MHz SYS_MCLK.
Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
| -rw-r--r-- | sound/soc/codecs/sgtl5000.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index 7665016a79ce..aa98be32bb60 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -1462,6 +1462,9 @@ static int sgtl5000_i2c_probe(struct i2c_client *client, if (ret) return ret; + /* Need 8 clocks before I2C accesses */ + udelay(1); + /* read chip information */ ret = regmap_read(sgtl5000->regmap, SGTL5000_CHIP_ID, ®); if (ret) |