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>

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 490404c6b4d8a2a9ff307077c5617ec9b5791da4..47357910653985094f7a65a553288cc709bdf63c 100644 (file)
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -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;