ALSA: hda - More strict correction of invalid pinctl bits

Check more strictly about the validity of pinctl values in
snd_hda_set_pin_ctl() and correct the wrong bits automatically.
Also provide the helper function to correct pinctl bits to codec
drivers.

This automatically fixes the invalid pinctl writes that are found in
a few Realtek fixups for NID 0x0f amp like ASUS A6Rp.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -5275,23 +5275,61 @@ unsigned int snd_hda_get_default_vref(struct hda_codec *codec, hda_nid_t pin)
 }
 EXPORT_SYMBOL_HDA(snd_hda_get_default_vref);
 
+/* correct the pin ctl value for matching with the pin cap */
+unsigned int snd_hda_correct_pin_ctl(struct hda_codec *codec,
+				     hda_nid_t pin, unsigned int val)
+{
+	static unsigned int cap_lists[][2] = {
+		{ AC_PINCTL_VREF_100, AC_PINCAP_VREF_100 },
+		{ AC_PINCTL_VREF_80, AC_PINCAP_VREF_80 },
+		{ AC_PINCTL_VREF_50, AC_PINCAP_VREF_50 },
+		{ AC_PINCTL_VREF_GRD, AC_PINCAP_VREF_GRD },
+	};
+	unsigned int cap;
+
+	if (!val)
+		return 0;
+	cap = snd_hda_query_pin_caps(codec, pin);
+	if (!cap)
+		return val; /* don't know what to do... */
+
+	if (val & AC_PINCTL_OUT_EN) {
+		if (!(cap & AC_PINCAP_OUT))
+			val &= ~(AC_PINCTL_OUT_EN | AC_PINCTL_HP_EN);
+		else if ((val & AC_PINCTL_HP_EN) && !(cap & AC_PINCAP_HP_DRV))
+			val &= ~AC_PINCTL_HP_EN;
+	}
+
+	if (val & AC_PINCTL_IN_EN) {
+		if (!(cap & AC_PINCAP_IN))
+			val &= ~(AC_PINCTL_IN_EN | AC_PINCTL_VREFEN);
+		else {
+			unsigned int vcap, vref;
+			int i;
+			vcap = (cap & AC_PINCAP_VREF) >> AC_PINCAP_VREF_SHIFT;
+			vref = val & AC_PINCTL_VREFEN;
+			for (i = 0; i < ARRAY_SIZE(cap_lists); i++) {
+				if (vref == cap_lists[i][0] &&
+				    !(vcap & cap_lists[i][1])) {
+					if (i == ARRAY_SIZE(cap_lists) - 1)
+						vref = AC_PINCTL_VREF_HIZ;
+					else
+						vref = cap_lists[i + 1][0];
+				}
+			}
+			val &= ~AC_PINCTL_VREFEN;
+			val |= vref;
+		}
+	}
+
+	return val;
+}
+EXPORT_SYMBOL_HDA(snd_hda_correct_pin_ctl);
+
 int _snd_hda_set_pin_ctl(struct hda_codec *codec, hda_nid_t pin,
 			 unsigned int val, bool cached)
 {
-	if (val) {
-		unsigned int cap = snd_hda_query_pin_caps(codec, pin);
-		if (cap && (val & AC_PINCTL_OUT_EN)) {
-			if (!(cap & AC_PINCAP_OUT))
-				val &= ~(AC_PINCTL_OUT_EN | AC_PINCTL_HP_EN);
-			else if ((val & AC_PINCTL_HP_EN) &&
-				 !(cap & AC_PINCAP_HP_DRV))
-				val &= ~AC_PINCTL_HP_EN;
-		}
-		if (cap && (val & AC_PINCTL_IN_EN)) {
-			if (!(cap & AC_PINCAP_IN))
-				val &= ~(AC_PINCTL_IN_EN | AC_PINCTL_VREFEN);
-		}
-	}
+	val = snd_hda_correct_pin_ctl(codec, pin, val);
 	snd_hda_codec_set_pin_target(codec, pin, val);
 	if (cached)
 		return snd_hda_codec_update_cache(codec, pin, 0,

sound/pci/hda/hda_local.h

@@ -490,6 +490,8 @@ struct hda_bus_unsolicited {
 #define PIN_HP_AMP		(AC_PINCTL_HP_EN)
 
 unsigned int snd_hda_get_default_vref(struct hda_codec *codec, hda_nid_t pin);
+unsigned int snd_hda_correct_pin_ctl(struct hda_codec *codec,
+				     hda_nid_t pin, unsigned int val);
 int _snd_hda_set_pin_ctl(struct hda_codec *codec, hda_nid_t pin,
 			 unsigned int val, bool cached);