diff options
| author | Eric Nelson <eric.nelson@boundarydevices.com> | 2015-01-30 14:07:55 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-11 14:54:49 +0800 |
| commit | 48e81ac2e37ec765f0885c0acc7b63f91f21da24 (patch) | |
| tree | cf03378a5a7745eaff19babdbebe8e6f7c3887a4 | |
| parent | e23daf1c3a2215e95b7c57c6e20beb4c7a08b599 (diff) | |
| download | lwn-48e81ac2e37ec765f0885c0acc7b63f91f21da24.tar.gz lwn-48e81ac2e37ec765f0885c0acc7b63f91f21da24.zip | |
ASoC: sgtl5000: add delay before first I2C access
commit 58cc9c9a175885bbf6bae3acf18233d0a8229a84 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 12528e9ac4c2..715589ff0eda 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -1521,6 +1521,9 @@ 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) |