ALSA: hda/idt - Cache the power-map bits

For avoiding unnecessary codec read/write verbs at each jack detection.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 1f6f520..7db8228 100644 (file)
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -222,6 +222,7 @@ struct sigmatel_spec {
        unsigned char aloopback_shift;
 
        /* power management */
+       unsigned int power_map_bits;
        unsigned int num_pwrs;
        const hda_nid_t *pwr_nids;
        const hda_nid_t *dac_list;
@@ -315,6 +316,9 @@ struct sigmatel_spec {
        struct hda_vmaster_mute_hook vmaster_mute;
 };
 
+#define AC_VERB_IDT_SET_POWER_MAP      0x7ec
+#define AC_VERB_IDT_GET_POWER_MAP      0xfec
+
 static const hda_nid_t stac9200_adc_nids[1] = {
         0x03,
 };
@@ -4406,6 +4410,12 @@ static int stac92xx_init(struct hda_codec *codec)
 
        /* sync mute LED */
        snd_hda_sync_vmaster_hook(&spec->vmaster_mute);
+
+       /* sync the power-map */
+       if (spec->num_pwrs)
+               snd_hda_codec_write(codec, codec->afg, 0,
+                                   AC_VERB_IDT_SET_POWER_MAP,
+                                   spec->power_map_bits);
        if (spec->dac_list)
                stac92xx_power_down(codec);
        return 0;
@@ -4651,14 +4661,18 @@ static void stac_toggle_power_map(struct hda_codec *codec, hda_nid_t nid,
 
        idx = 1 << idx;
 
-       val = snd_hda_codec_read(codec, codec->afg, 0, 0x0fec, 0x0) & 0xff;
+       val = spec->power_map_bits;
        if (enable)
                val &= ~idx;
        else
                val |= idx;
 
        /* power down unused output ports */
-       snd_hda_codec_write(codec, codec->afg, 0, 0x7ec, val);
+       if (val != spec->power_map_bits) {
+               spec->power_map_bits = val;
+               snd_hda_codec_write(codec, codec->afg, 0,
+                                   AC_VERB_IDT_SET_POWER_MAP, val);
+       }
 }
 
 static void stac92xx_pin_sense(struct hda_codec *codec, hda_nid_t nid)
@@ -4926,7 +4940,8 @@ static void stac92hd_proc_hook(struct snd_info_buffer *buffer,
 {
        if (nid == codec->afg)
                snd_iprintf(buffer, "Power-Map: 0x%02x\n", 
-                           snd_hda_codec_read(codec, nid, 0, 0x0fec, 0x0));
+                           snd_hda_codec_read(codec, nid, 0,
+                                              AC_VERB_IDT_GET_POWER_MAP, 0));
 }
 
 static void analog_loop_proc_hook(struct snd_info_buffer *buffer,