diff options
| author | Eric Nelson <eric.nelson@boundarydevices.com> | 2015-01-30 14:07:55 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-02-09 10:50:22 +0100 |
| commit | b8de3b8efb36fbac23f80ba980858777ff0c4034 (patch) | |
| tree | 192b4b02d87a05926d2e2dd1bb5a767f00ea4ab0 /sound | |
| parent | 118ccf9d5bd49b33ad27fa821ef0ab1c3839ec77 (diff) | |
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: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'sound')
| -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 b76c6b619227..ba73f832e455 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -1550,6 +1550,9 @@ 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) |