[ALSA] ice1724 - Misc fixes for Prodigy192

- always set 256fs in SPDIF master clock mode
- disable deemphasis filter in AK4114 for Prodigy192
Signed-off-by: Pavel Hofman <dustin@seznam.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/pci/ice1712/ice1724.c

@@ -1666,7 +1666,12 @@ static int snd_vt1724_pro_internal_clock_put(struct snd_kcontrol *kcontrol,
 	spin_lock_irq(&ice->reg_lock);
 	oval = inb(ICEMT1724(ice, RATE));
 	if (ucontrol->value.enumerated.item[0] == spdif) {
+		unsigned char i2s_oval;
 		outb(oval | VT1724_SPDIF_MASTER, ICEMT1724(ice, RATE));
+		/* setting 256fs */
+		i2s_oval = inb(ICEMT1724(ice, I2S_FORMAT));
+		outb(i2s_oval & ~VT1724_MT_I2S_MCLK_128X,
+		     ICEMT1724(ice, I2S_FORMAT));
 	} else {
 		rate = rates[ucontrol->value.integer.value[0] % 15];
 		if (rate <= get_max_rate(ice)) {

sound/pci/ice1712/prodigy192.c

@@ -26,6 +26,13 @@
  * 			CCLK (pin 34) -- GPIO9 pin 76
  * 			CSN  (pin 35) -- GPIO8 pin 75
  *   		- output data Mode 7 (24bit, I2S, slave)
+ *		- both MCKO1 and MCKO2 of ak4114 are fed to FPGA, which
+ *		  outputs master clock to SPMCLKIN of ice1724.
+ *		  Experimentally I found out that only a combination of
+ *		  OCKS0=1, OCKS1=1 (128fs, 64fs output) and ice1724 -
+ *		  VT1724_MT_I2S_MCLK_128X=0 (256fs input) yields correct
+ *		  sampling rate. That means the the FPGA doubles the
+ *		  MCK01 rate.
  *
  *	Copyright (c) 2003 Takashi Iwai <tiwai@suse.de>
  *      Copyright (c) 2003 Dimitromanolakis Apostolos <apostol@cs.utoronto.ca>
@@ -714,7 +721,10 @@ static int prodigy192_ak4114_init(struct snd_ice1712 *ice)
 {
 	static const unsigned char ak4114_init_vals[] = {
 		AK4114_RST | AK4114_PWN | AK4114_OCKS0 | AK4114_OCKS1,
-		AK4114_DIF_I24I2S, /* ice1724 expects I2S and provides clock */
+		/* ice1724 expects I2S and provides clock,
+		 * DEM0 disables the deemphasis filter
+		 */
+		AK4114_DIF_I24I2S | AK4114_DEM0 ,
 		AK4114_TX1E,
 		AK4114_EFH_1024 | AK4114_DIT, /* default input RX0 */
 		0,