ALSA: hda - introduce snd_hda_codec_update_cache()
Add a new helper, snd_hda_codec_update_cache(), for reducing the unneeded
verbs. This function checks the cached value and skips if it's identical
with the given one. Otherwise it works like snd_hda_codec_write_cache().
The alc269 code uses this function as an example.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 9a361c2..8ae4806 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -14012,8 +14012,9 @@
else
pinval = 0x20;
/* mic2 vref pin is used for mute LED control */
- snd_hda_codec_write(codec, 0x19, 0,
- AC_VERB_SET_PIN_WIDGET_CONTROL, pinval);
+ snd_hda_codec_update_cache(codec, 0x19, 0,
+ AC_VERB_SET_PIN_WIDGET_CONTROL,
+ pinval);
}
return alc_check_power_status(codec, nid);
}