ALSA: dice: old firmware optimization for Dice notification

As long as I tested, Dice-based models produced by TC Electronic with
factory-configured settings transfer no notification within
ensure_phase_lock(). On the other hand, with upgraded firmwares, it
starts to transfer the notification. This seems to be a quirk of earlier
firmwares.

This commit ensures phase lock by reading a register after waiting for
the notification. Even if it's timed-out, ensure_phase_lock() return
success as long as the register has expected clock status.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index e4938b0..a64b3cc 100644 (file)
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -31,7 +31,7 @@ const unsigned int snd_dice_rates[SND_DICE_RATES_COUNT] = {
  */
 static int ensure_phase_lock(struct snd_dice *dice)
 {
-       __be32 reg;
+       __be32 reg, nominal;
        int err;
 
        err = snd_dice_transaction_read_global(dice, GLOBAL_CLOCK_SELECT,
@@ -48,8 +48,19 @@ static int ensure_phase_lock(struct snd_dice *dice)
                return err;
 
        if (wait_for_completion_timeout(&dice->clock_accepted,
-                       msecs_to_jiffies(NOTIFICATION_TIMEOUT_MS)) == 0)
-               return -ETIMEDOUT;
+                       msecs_to_jiffies(NOTIFICATION_TIMEOUT_MS)) == 0) {
+               /*
+                * Old versions of Dice firmware transfer no notification when
+                * the same clock status as current one is set. In this case,
+                * just check current clock status.
+                */
+               err = snd_dice_transaction_read_global(dice, GLOBAL_STATUS,
+                                               &nominal, sizeof(nominal));
+               if (err < 0)
+                       return err;
+               if (!(be32_to_cpu(nominal) & STATUS_SOURCE_LOCKED))
+                       return -ETIMEDOUT;
+       }
 
        return 0;
 }