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ASoC: pxa2xx-i2s: Proper hw initialization 

Make sure we are in a know good state at end of probe :
Reset FIFO logic and registers, and make sure REC and RPL functions
along with FIFO service are disabled (SACR0_RST enables REC and RPL).

Resetting loses current settings so remove reset from stream startup.
Now reset occurs only at probe.

Signed-off-by: Karl Beldan <karl.beldan@mobile-devices.fr>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Karl Beldan 2009-05-14 10:25:42 +02:00 committed by Mark Brown
parent 13e2c86c20
commit b243b77c70
1 changed files with 14 additions and 3 deletions
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17
sound/soc/pxa/pxa2xx-i2s.c
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@ -106,10 +106,8 @@ static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream,
if (IS_ERR(clk_i2s))
return PTR_ERR(clk_i2s);
if (!cpu_dai->active) {
SACR0 |= SACR0_RST;
if (!cpu_dai->active)
SACR0 = 0;
}
return 0;
}
@ -347,6 +345,19 @@ static int pxa2xx_i2s_probe(struct platform_device *dev)
if (ret != 0)
clk_put(clk_i2s);
/*
* PXA Developer's Manual:
* If SACR0[ENB] is toggled in the middle of a normal operation,
* the SACR0[RST] bit must also be set and cleared to reset all
* I2S controller registers.
*/
SACR0 = SACR0_RST;
SACR0 = 0;
/* Make sure RPL and REC are disabled */
SACR1 = SACR1_DRPL | SACR1_DREC;
/* Along with FIFO servicing */
SAIMR &= ~(SAIMR_RFS | SAIMR_TFS);
return ret;
}