Commit 82adf350 authored by Eric Nelson's avatar Eric Nelson Committed by Luis Henriques

ASoC: sgtl5000: add delay before first I2C access

commit 58cc9c9a 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: default avatarEric Nelson <eric.nelson@boundarydevices.com>
Reviewed-by: default avatarFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 2a45ce48
...@@ -1463,6 +1463,9 @@ static int sgtl5000_i2c_probe(struct i2c_client *client, ...@@ -1463,6 +1463,9 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
if (ret) if (ret)
return ret; return ret;
/* Need 8 clocks before I2C accesses */
udelay(1);
/* read chip information */ /* read chip information */
ret = regmap_read(sgtl5000->regmap, SGTL5000_CHIP_ID, &reg); ret = regmap_read(sgtl5000->regmap, SGTL5000_CHIP_ID, &reg);
if (ret) if (ret)
......
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