ALSA: ice1724 - pro-rate-locking makes sense only for internal clock mode

* pro-rate-locking applies to internal clock mode only
* required rate and current rate are compared for internal clock mode only

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 16 insertions, 7 deletions

diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
index 2213beec009a..514e15385f7a 100644
--- a/sound/pci/ice1712/ice1724.c
+++ b/sound/pci/ice1712/ice1724.c
@@ -118,9 +118,12 @@ static inline int stdclock_is_spdif_master(struct snd_ice1712 *ice)
         return (inb(ICEMT1724(ice, RATE)) & VT1724_SPDIF_MASTER) ? 1 : 0;
 }
 
+/*
+ * locking rate makes sense only for internal clock mode
+ */
 static inline int is_pro_rate_locked(struct snd_ice1712 *ice)
 {
-        return ice->is_spdif_master(ice) || PRO_RATE_LOCKED;
+        return (!ice->is_spdif_master(ice)) && PRO_RATE_LOCKED;
 }
 
 /*
@@ -668,16 +671,22 @@ static int snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
                 return -EBUSY;
         }
         if (!force && is_pro_rate_locked(ice)) {
+                /* comparing required and current rate - makes sense for
+                 * internal clock only */
                 spin_unlock_irqrestore(&ice->reg_lock, flags);
                 return (rate == ice->cur_rate) ? 0 : -EBUSY;
         }
 
-        old_rate = ice->get_rate(ice);
-        if (force || (old_rate != rate))
-                ice->set_rate(ice, rate);
-        else if (rate == ice->cur_rate) {
-                spin_unlock_irqrestore(&ice->reg_lock, flags);
-                return 0;
+        if (force || !ice->is_spdif_master(ice)) {
+                /* force means the rate was switched by ucontrol, otherwise
+                 * setting clock rate for internal clock mode */
+                old_rate = ice->get_rate(ice);
+                if (force || (old_rate != rate))
+                        ice->set_rate(ice, rate);
+                else if (rate == ice->cur_rate) {
+                        spin_unlock_irqrestore(&ice->reg_lock, flags);
+                        return 0;
+                }
         }
 
         ice->cur_rate = rate;