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ASoC: sgtl5000: Remove MCLK restriction 

According to the sgtl5000 datasheet the MCLK frequency range restriction of
8 to 27 MHz only applies when the PLL is used - synchronous SYS_MCLK input mode.

When running the codec as slave, the master should generate MCLK in the range of
256*fs, 384*fs or 512*fs, which is called asynchronous SYS_MCLK input mode.

In asynchronous SYS_MCLK we cannot have the 8 to 27 MHz check because if we
want to play a 8KHz sample rate track, with a MCLK of 8k * 512 = 4.096MHz the
current check would return -EINVAL, which is not correct.

Remove the 8 to 27MHz frequency check, since this only applies to the
synchronous SYS_MCLK input case.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Fabio Estevam 2014-11-27 13:02:00 -02:00 committed by Mark Brown
parent ebc01f593b
commit d819ce965d
1 changed files with 0 additions and 9 deletions
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9
sound/soc/codecs/sgtl5000.c
View File

@ -1435,7 +1435,6 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
{
struct sgtl5000_priv *sgtl5000;
int ret, reg, rev;
unsigned int mclk;
struct device_node *np = client->dev.of_node;
u32 value;
@ -1460,14 +1459,6 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
return ret;
}
/* SGTL5000 SYS_MCLK should be between 8 and 27 MHz */
mclk = clk_get_rate(sgtl5000->mclk);
if (mclk < 8000000 || mclk > 27000000) {
dev_err(&client->dev, "Invalid SYS_CLK frequency: %u.%03uMHz\n",
mclk / 1000000, mclk / 1000 % 1000);
return -EINVAL;
}
ret = clk_prepare_enable(sgtl5000->mclk);
if (ret)
return ret;