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authorTakashi Iwai <tiwai@suse.de>2006-06-27 18:28:53 +0200
committerJaroslav Kysela <perex@suse.cz>2006-09-23 10:37:08 +0200
commit6dbe662874ba08585eaf732d126762c25ac8e3f7 (patch)
tree7460c36d4d848f223b682f7a700866bcf6dbc7d5 /include/sound
parent2b29b13c5794f648cd5e839796496704d787f5a6 (diff)
[ALSA] Add experimental support of aggressive AC97 power-saving mode
Added CONFIG_SND_AC97_POWER_SAVE kernel config to enable the support of aggressive AC97 power-saving mode. In this mode, the AC97 powerdown register bits are dynamically controlled at each open/close of PCM streams. The mode is activated via power_save option for snd-ac97-codec driver. As default it's off. It can be turned on/off on the fly via sysfs, too. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/ac97_codec.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h
index 758f8bf133c..4c43521cc49 100644
--- a/include/sound/ac97_codec.h
+++ b/include/sound/ac97_codec.h
@@ -27,6 +27,7 @@
#include <linux/bitops.h>
#include <linux/device.h>
+#include <linux/workqueue.h>
#include "pcm.h"
#include "control.h"
#include "info.h"
@@ -140,6 +141,20 @@
#define AC97_GP_DRSS_1011 0x0000 /* LR(C) 10+11(+12) */
#define AC97_GP_DRSS_78 0x0400 /* LR 7+8 */
+/* powerdown bits */
+#define AC97_PD_ADC_STATUS 0x0001 /* ADC status (RO) */
+#define AC97_PD_DAC_STATUS 0x0002 /* DAC status (RO) */
+#define AC97_PD_MIXER_STATUS 0x0004 /* Analog mixer status (RO) */
+#define AC97_PD_VREF_STATUS 0x0008 /* Vref status (RO) */
+#define AC97_PD_PR0 0x0100 /* Power down PCM ADCs and input MUX */
+#define AC97_PD_PR1 0x0200 /* Power down PCM front DAC */
+#define AC97_PD_PR2 0x0400 /* Power down Mixer (Vref still on) */
+#define AC97_PD_PR3 0x0800 /* Power down Mixer (Vref off) */
+#define AC97_PD_PR4 0x1000 /* Power down AC-Link */
+#define AC97_PD_PR5 0x2000 /* Disable internal clock usage */
+#define AC97_PD_PR6 0x4000 /* Headphone amplifier */
+#define AC97_PD_EAPD 0x8000 /* External Amplifer Power Down (EAPD) */
+
/* extended audio ID bit defines */
#define AC97_EI_VRA 0x0001 /* Variable bit rate supported */
#define AC97_EI_DRA 0x0002 /* Double rate supported */
@@ -359,6 +374,7 @@
#define AC97_SCAP_INV_EAPD (1<<7) /* inverted EAPD */
#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 */
/* ac97->flags */
#define AC97_HAS_PC_BEEP (1<<0) /* force PC Speaker usage */
@@ -491,6 +507,12 @@ struct snd_ac97 {
/* jack-sharing info */
unsigned char indep_surround;
unsigned char channel_mode;
+
+#ifdef CONFIG_SND_AC97_POWER_SAVE
+ unsigned int power_up; /* power states */
+ struct workqueue_struct *power_workq;
+ struct work_struct power_work;
+#endif
struct device dev;
};
@@ -532,6 +554,15 @@ unsigned short snd_ac97_read(struct snd_ac97 *ac97, unsigned short reg);
void snd_ac97_write_cache(struct snd_ac97 *ac97, unsigned short reg, unsigned short value);
int snd_ac97_update(struct snd_ac97 *ac97, unsigned short reg, unsigned short value);
int snd_ac97_update_bits(struct snd_ac97 *ac97, unsigned short reg, unsigned short mask, unsigned short value);
+#ifdef CONFIG_SND_AC97_POWER_SAVE
+int snd_ac97_update_power(struct snd_ac97 *ac97, int reg, int powerup);
+#else
+static inline int snd_ac97_update_power(struct snd_ac97 *ac97, int reg,
+ int powerup)
+{
+ return 0;
+}
+#endif
#ifdef CONFIG_PM
void snd_ac97_suspend(struct snd_ac97 *ac97);
void snd_ac97_resume(struct snd_ac97 *ac97);
@@ -583,6 +614,7 @@ struct ac97_pcm {
copy_flag: 1, /* lowlevel driver must fill all entries */
spdif: 1; /* spdif pcm */
unsigned short aslots; /* active slots */
+ unsigned short cur_dbl; /* current double-rate state */
unsigned int rates; /* available rates */
struct {
unsigned short slots; /* driver input: requested AC97 slot numbers */