Commit 085d9e9e authored Jan 30, 2015 by Eric Nelson Committed by Greg Kroah-Hartman Feb 11, 2015

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>

parent c0c9fe84

sound/soc/codecs/sgtl5000.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1452,6 +1452,9 @@ 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, &reg);
		if (ret)