sound: oxygen: better defaults for upmixing control

On card models with two-channel outputs, the base driver can
automatically disable the upmixing control so that the model
drivers do not need to do this.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/oxygen/hifier.c

@@ -141,19 +141,11 @@ static void set_cs5340_params(struct oxygen *chip,
 
 static const DECLARE_TLV_DB_LINEAR(ak4396_db_scale, TLV_DB_GAIN_MUTE, 0);
 
-static int hifier_control_filter(struct snd_kcontrol_new *template)
-{
-	if (!strcmp(template->name, "Stereo Upmixing"))
-		return 1; /* stereo only - we don't need upmixing */
-	return 0;
-}
-
 static const struct oxygen_model model_hifier = {
 	.shortname = "C-Media CMI8787",
 	.longname = "C-Media Oxygen HD Audio",
 	.chip = "CMI8788",
 	.init = hifier_init,
-	.control_filter = hifier_control_filter,
 	.cleanup = hifier_cleanup,
 	.resume = hifier_resume,
 	.set_dac_params = set_ak4396_params,

sound/pci/oxygen/oxygen_mixer.c

@@ -954,6 +954,9 @@ static int add_controls(struct oxygen *chip,
 			if (err == 1)
 				continue;
 		}
+		if (!strcmp(template.name, "Stereo Upmixing") &&
+		    chip->model.dac_channels == 2)
+			continue;
 		if (!strcmp(template.name, "Master Playback Volume") &&
 		    chip->model.dac_tlv) {
 			template.tlv.p = chip->model.dac_tlv;

sound/pci/oxygen/xonar_pcm179x.c

@@ -605,8 +605,6 @@ static int xonar_st_control_filter(struct snd_kcontrol_new *template)
 {
 	if (!strncmp(template->name, "CD Capture ", 11))
 		return 1; /* no CD input */
-	if (!strcmp(template->name, "Stereo Upmixing"))
-		return 1; /* stereo only - we don't need upmixing */
 	return 0;
 }