1 files changed, 16 insertions, 9 deletions

diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index a4b72cd2eea0..6983eea226da 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -367,6 +367,7 @@ int snd_ac97_update(ac97_t *ac97, unsigned short reg, unsigned short value)
                 ac97->regs[reg] = value;
                 ac97->bus->ops->write(ac97, reg, value);
         }
+        set_bit(reg, ac97->reg_accessed);
         up(&ac97->reg_mutex);
         return change;
 }
@@ -410,6 +411,7 @@ int snd_ac97_update_bits_nolock(ac97_t *ac97, unsigned short reg,
                 ac97->regs[reg] = new;
                 ac97->bus->ops->write(ac97, reg, new);
         }
+        set_bit(reg, ac97->reg_accessed);
         return change;
 }
 
@@ -1076,6 +1078,11 @@ static void check_volume_resolution(ac97_t *ac97, int reg, unsigned char *lo_max
         for (i = 0 ; i < ARRAY_SIZE(cbit); i++) {
                 unsigned short val;
                 snd_ac97_write(ac97, reg, 0x8080 | cbit[i] | (cbit[i] << 8));
+                /* Do the read twice due to buffers on some ac97 codecs.
+                 * e.g. The STAC9704 returns exactly what you wrote the the register
+                 * if you read it immediately. This causes the detect routine to fail.
+                 */
+                val = snd_ac97_read(ac97, reg);
                 val = snd_ac97_read(ac97, reg);
                 if (! *lo_max && (val & 0x7f) == cbit[i])
                         *lo_max = max[i];
@@ -2224,7 +2231,7 @@ void snd_ac97_restore_iec958(ac97_t *ac97)
  */
 void snd_ac97_resume(ac97_t *ac97)
 {
-        int i;
+        unsigned long end_time;
 
         if (ac97->bus->ops->reset) {
                 ac97->bus->ops->reset(ac97);
@@ -2242,26 +2249,26 @@ void snd_ac97_resume(ac97_t *ac97)
         snd_ac97_write(ac97, AC97_POWERDOWN, ac97->regs[AC97_POWERDOWN]);
         if (ac97_is_audio(ac97)) {
                 ac97->bus->ops->write(ac97, AC97_MASTER, 0x8101);
-                for (i = HZ/10; i >= 0; i--) {
+                end_time = jiffies + msecs_to_jiffies(100);
+                do {
                         if (snd_ac97_read(ac97, AC97_MASTER) == 0x8101)
                                 break;
                         set_current_state(TASK_UNINTERRUPTIBLE);
                         schedule_timeout(1);
-                }
+                } while (time_after_eq(end_time, jiffies));
                 /* FIXME: extra delay */
                 ac97->bus->ops->write(ac97, AC97_MASTER, 0x8000);
-                if (snd_ac97_read(ac97, AC97_MASTER) != 0x8000) {
-                        set_current_state(TASK_UNINTERRUPTIBLE);
-                        schedule_timeout(HZ/4);
-                }
+                if (snd_ac97_read(ac97, AC97_MASTER) != 0x8000)
+                        msleep(250);
         } else {
-                for (i = HZ/10; i >= 0; i--) {
+                end_time = jiffies + msecs_to_jiffies(100);
+                do {
                         unsigned short val = snd_ac97_read(ac97, AC97_EXTENDED_MID);
                         if (val != 0xffff && (val & 1) != 0)
                                 break;
                         set_current_state(TASK_UNINTERRUPTIBLE);
                         schedule_timeout(1);
-                }
+                } while (time_after_eq(end_time, jiffies));
         }
 __reset_ready: