[ALSA] ac97 - Suppress power-saving mode on non-supporting drivers

Don't enable power-saving mode on drivers that don't support
it.  The supporting drivers set AC97_SCAP_POWER_SAVE to scaps
at creation of ac97 instance.
Currently enable on the following drivers: intel8x0, intel8x0m,
atiixp, atiixp-modem, via82xx and via82xx-modem.
Also, a bit clean up of power-saving stuff:
- Don't create an own workq
- Remove superfluous ifdefs

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

8 files changed, 28 insertions, 27 deletions

diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h
index 5f7c78d9e379..5d3f0d8c0e61 100644
--- a/include/sound/ac97_codec.h
+++ b/include/sound/ac97_codec.h
@@ -375,6 +375,7 @@
 #define AC97_SCAP_DETECT_BY_VENDOR (1<<8) /* use vendor registers for read tests */
 #define AC97_SCAP_NO_SPDIF      (1<<9)  /* don't build SPDIF controls */
 #define AC97_SCAP_EAPD_LED      (1<<10) /* EAPD as mute LED */
+#define AC97_SCAP_POWER_SAVE    (1<<11) /* capable for aggresive power-saving */
 
 /* ac97->flags */
 #define AC97_HAS_PC_BEEP        (1<<0)  /* force PC Speaker usage */
@@ -511,7 +512,6 @@ struct snd_ac97 {
 
 #ifdef CONFIG_SND_AC97_POWER_SAVE
         unsigned int power_up;  /* power states */
-        struct workqueue_struct *power_workq;
         struct delayed_work power_work;
 #endif
         struct device dev;
diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index d2994cb4c8c9..9da4977c0a0c 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -194,6 +194,13 @@ static const struct ac97_codec_id snd_ac97_codec_ids[] = {
 
 
 static void update_power_regs(struct snd_ac97 *ac97);
+#ifdef CONFIG_SND_AC97_POWER_SAVE
+#define ac97_is_power_save_mode(ac97) \
+        ((ac97->scaps & AC97_SCAP_POWER_SAVE) && power_save)
+#else
+#define ac97_is_power_save_mode(ac97) 0
+#endif
+
 
 /*
  *  I/O routines
@@ -982,8 +989,7 @@ static int snd_ac97_free(struct snd_ac97 *ac97)
 {
         if (ac97) {
 #ifdef CONFIG_SND_AC97_POWER_SAVE
-                if (ac97->power_workq)
-                        destroy_workqueue(ac97->power_workq);
+                cancel_delayed_work(&ac97->power_work);
 #endif
                 snd_ac97_proc_done(ac97);
                 if (ac97->bus)
@@ -1989,7 +1995,6 @@ int snd_ac97_mixer(struct snd_ac97_bus *bus, struct snd_ac97_template *template,
         mutex_init(&ac97->reg_mutex);
         mutex_init(&ac97->page_mutex);
 #ifdef CONFIG_SND_AC97_POWER_SAVE
-        ac97->power_workq = create_workqueue("ac97");
         INIT_DELAYED_WORK(&ac97->power_work, do_update_power);
 #endif
 
@@ -2275,15 +2280,13 @@ static void snd_ac97_powerdown(struct snd_ac97 *ac97)
         udelay(100);
         power |= AC97_PD_PR2 | AC97_PD_PR3;     /* Analog Mixer powerdown */
         snd_ac97_write(ac97, AC97_POWERDOWN, power);
-#ifdef CONFIG_SND_AC97_POWER_SAVE
-        if (power_save) {
+        if (ac97_is_power_save_mode(ac97)) {
                 udelay(100);
                 /* AC-link powerdown, internal Clk disable */
                 /* FIXME: this may cause click noises on some boards */
                 power |= AC97_PD_PR4 | AC97_PD_PR5;
                 snd_ac97_write(ac97, AC97_POWERDOWN, power);
         }
-#endif
 }
 
 
@@ -2337,14 +2340,16 @@ int snd_ac97_update_power(struct snd_ac97 *ac97, int reg, int powerup)
                 }
         }
 
-        if (power_save && !powerup && ac97->power_workq)
+        if (ac97_is_power_save_mode(ac97) && !powerup)
                 /* adjust power-down bits after two seconds delay
                  * (for avoiding loud click noises for many (OSS) apps
                  *  that open/close frequently)
                  */
-                queue_delayed_work(ac97->power_workq, &ac97->power_work, HZ*2);
-        else
+                schedule_delayed_work(&ac97->power_work, HZ*2);
+        else {
+                cancel_delayed_work(&ac97->power_work);
                 update_power_regs(ac97);
+        }
 
         return 0;
 }
@@ -2357,19 +2362,15 @@ static void update_power_regs(struct snd_ac97 *ac97)
         unsigned int power_up, bits;
         int i;
 
+        power_up = (1 << PWIDX_FRONT) | (1 << PWIDX_ADC);
+        power_up |= (1 << PWIDX_MIC);
+        if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
+                power_up |= (1 << PWIDX_SURR);
+        if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
+                power_up |= (1 << PWIDX_CLFE);
 #ifdef CONFIG_SND_AC97_POWER_SAVE
-        if (power_save)
+        if (ac97_is_power_save_mode(ac97))
                 power_up = ac97->power_up;
-        else {
-#endif
-                power_up = (1 << PWIDX_FRONT) | (1 << PWIDX_ADC);
-                power_up |= (1 << PWIDX_MIC);
-                if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
-                        power_up |= (1 << PWIDX_SURR);
-                if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
-                        power_up |= (1 << PWIDX_CLFE);
-#ifdef CONFIG_SND_AC97_POWER_SAVE
-        }
 #endif
         if (power_up) {
                 if (ac97->regs[AC97_POWERDOWN] & AC97_PD_PR2) {
diff --git a/sound/pci/atiixp.c b/sound/pci/atiixp.c
index 476c3433073e..86710df71a8e 100644
--- a/sound/pci/atiixp.c
+++ b/sound/pci/atiixp.c
@@ -1396,7 +1396,7 @@ static int __devinit snd_atiixp_mixer_new(struct atiixp *chip, int clock,
                 ac97.private_data = chip;
                 ac97.pci = chip->pci;
                 ac97.num = i;
-                ac97.scaps = AC97_SCAP_SKIP_MODEM;
+                ac97.scaps = AC97_SCAP_SKIP_MODEM | AC97_SCAP_POWER_SAVE;
                 if (! chip->spdif_over_aclink)
                         ac97.scaps |= AC97_SCAP_NO_SPDIF;
                 if ((err = snd_ac97_mixer(pbus, &ac97, &chip->ac97[i])) < 0) {
diff --git a/sound/pci/atiixp_modem.c b/sound/pci/atiixp_modem.c
index cc2e6b9d407e..904023fe4f26 100644
--- a/sound/pci/atiixp_modem.c
+++ b/sound/pci/atiixp_modem.c
@@ -1090,7 +1090,7 @@ static int __devinit snd_atiixp_mixer_new(struct atiixp_modem *chip, int clock)
                 ac97.private_data = chip;
                 ac97.pci = chip->pci;
                 ac97.num = i;
-                ac97.scaps = AC97_SCAP_SKIP_AUDIO;
+                ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
                 if ((err = snd_ac97_mixer(pbus, &ac97, &chip->ac97[i])) < 0) {
                         chip->ac97[i] = NULL; /* to be sure */
                         snd_printdd("atiixp-modem: codec %d not available for modem\n", i);
diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index 28d5d9deb892..f8aef131be7a 100644
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -2057,7 +2057,7 @@ static int __devinit snd_intel8x0_mixer(struct intel8x0 *chip, int ac97_clock,
         memset(&ac97, 0, sizeof(ac97));
         ac97.private_data = chip;
         ac97.private_free = snd_intel8x0_mixer_free_ac97;
-        ac97.scaps = AC97_SCAP_SKIP_MODEM;
+        ac97.scaps = AC97_SCAP_SKIP_MODEM | AC97_SCAP_POWER_SAVE;
         if (chip->xbox)
                 ac97.scaps |= AC97_SCAP_DETECT_BY_VENDOR;
         if (chip->device_type != DEVICE_ALI) {
diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index 936c3cf16936..c155e1f3a0e5 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -830,7 +830,7 @@ static int __devinit snd_intel8x0_mixer(struct intel8x0m *chip, int ac97_clock)
         memset(&ac97, 0, sizeof(ac97));
         ac97.private_data = chip;
         ac97.private_free = snd_intel8x0_mixer_free_ac97;
-        ac97.scaps = AC97_SCAP_SKIP_AUDIO;
+        ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
 
         glob_sta = igetdword(chip, ICHREG(GLOB_STA));
 
diff --git a/sound/pci/via82xx.c b/sound/pci/via82xx.c
index a572b018807f..0440df7de37d 100644
--- a/sound/pci/via82xx.c
+++ b/sound/pci/via82xx.c
@@ -1823,7 +1823,7 @@ static int __devinit snd_via82xx_mixer_new(struct via82xx *chip, const char *qui
         ac97.private_data = chip;
         ac97.private_free = snd_via82xx_mixer_free_ac97;
         ac97.pci = chip->pci;
-        ac97.scaps = AC97_SCAP_SKIP_MODEM;
+        ac97.scaps = AC97_SCAP_SKIP_MODEM | AC97_SCAP_POWER_SAVE;
         if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
                 return err;
 
diff --git a/sound/pci/via82xx_modem.c b/sound/pci/via82xx_modem.c
index 17d6b847585f..b338e15db0d9 100644
--- a/sound/pci/via82xx_modem.c
+++ b/sound/pci/via82xx_modem.c
@@ -900,7 +900,7 @@ static int __devinit snd_via82xx_mixer_new(struct via82xx_modem *chip)
         ac97.private_data = chip;
         ac97.private_free = snd_via82xx_mixer_free_ac97;
         ac97.pci = chip->pci;
-        ac97.scaps = AC97_SCAP_SKIP_AUDIO;
+        ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
         ac97.num = chip->ac97_secondary;
 
         if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)