ALSA: hda - Re-add the lost fake mute support

Yet another regression by the transition to regmap cache; for better
usability, we had the fake mute control using the zero amp value for
Conexant codecs, and this was forgotten in the new hda core code.

Since the bits 4-7 are unused for the amp registers (as we follow the
syntax of AMP_GET verb), the bit 4 is now used to indicate the fake
mute.  For setting this flag, snd_hda_codec_amp_update() becomes a
function from a simple macro.  The bonus is that it gained a proper
function description.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/include/sound/hda_regmap.h b/include/sound/hda_regmap.h
index 53a18b3635e2..df705908480a 100644
--- a/include/sound/hda_regmap.h
+++ b/include/sound/hda_regmap.h
@@ -9,6 +9,8 @@
 #include <sound/core.h>
 #include <sound/hdaudio.h>
 
+#define AC_AMP_FAKE_MUTE        0x10    /* fake mute bit set to amp verbs */
+
 int snd_hdac_regmap_init(struct hdac_device *codec);
 void snd_hdac_regmap_exit(struct hdac_device *codec);
 int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec,