ALSA: ice1712 delta - initialize SPI clock

The driver was using an initial value for the clock on the SPI bus
which was read from ICE1712 EEPROM,
ice->eeprom.data[ICE_EEP1_GPIO_STATE] & ICE1712_DELTA_AP_CCLK (0x02)

It appears some cards have it default high, some cards
have it default low. On my Delta 66 rev. E:
$ cat /proc/asound/M66/ice1712 | grep 'GPIO state'
  GPIO state       : 0x70 /* ICE1712_DELTA_AP_CCLK bit is zero */
On my Audiophile 2496:
$ cat /proc/asound/M2496/ice1712 | grep 'GPIO state'
  GPIO state       : 0xfe /* ICE1712_DELTA_AP_CCLK bit is one */

It must be raised before the first SPI write happens, or the write will
fail, leading to:

[   23.248721] invalid CS8427 signature 0x0: let me try again...

I theorize that 4eb4550ab37d351ab0973ccec921a5a2d8560ec7
is no longer needed, it was a different way to workaround
the problem.

[fixed variable decleration by tiwai]

Signed-off-by: Brian Bloniarz <brian.bloniarz@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/sound/pci/ice1712/delta.c b/sound/pci/ice1712/delta.c
index 7b62de089fee..20c6b079d0df 100644
--- a/sound/pci/ice1712/delta.c
+++ b/sound/pci/ice1712/delta.c
@@ -580,6 +580,7 @@ static int __devinit snd_ice1712_delta_init(struct snd_ice1712 *ice)
 {
         int err;
         struct snd_akm4xxx *ak;
+        unsigned char tmp;
 
         if (ice->eeprom.subvendor == ICE1712_SUBDEVICE_DELTA1010 &&
             ice->eeprom.gpiodir == 0x7b)
@@ -622,6 +623,12 @@ static int __devinit snd_ice1712_delta_init(struct snd_ice1712 *ice)
                 break;
         }
 
+        /* initialize the SPI clock to high */
+        tmp = snd_ice1712_read(ice, ICE1712_IREG_GPIO_DATA);
+        tmp |= ICE1712_DELTA_AP_CCLK;
+        snd_ice1712_write(ice, ICE1712_IREG_GPIO_DATA, tmp);
+        udelay(5);
+
         /* initialize spdif */
         switch (ice->eeprom.subvendor) {
         case ICE1712_SUBDEVICE_AUDIOPHILE: