ALSA: hda - Restore default pin configs for realtek codecs

Some machines have broken BIOS resume that doesn't restore the default
pin configuration properly, which results in a wrong detection of HP
pin. This causes a silent speaker output due to missing HP detection.
Related bug: Novell bug#406101
https://bugzilla.novell.com/show_bug.cgi?id=406101

This patch fixes the issue by saving/restoring the default pin configs
by the driver itself.

Signed-off-by: Takashi Iwai <[e-mail]>

sound/pci/hda/patch_realtek.c

···
 	/* for PLL fix */
 	hda_nid_t pll_nid;
 	unsigned int pll_coef_idx, pll_coef_bit;
+
+#ifdef SND_HDA_NEEDS_RESUME
+#define ALC_MAX_PINS	16
+	unsigned int num_pins;
+	hda_nid_t pin_nids[ALC_MAX_PINS];
+	unsigned int pin_cfgs[ALC_MAX_PINS];
+#endif
 };
 
 /*
···
 	codec->spec = NULL; /* to be sure */
 }
 
+#ifdef SND_HDA_NEEDS_RESUME
+static void store_pin_configs(struct hda_codec *codec)
+{
+	struct alc_spec *spec = codec->spec;
+	hda_nid_t nid, end_nid;
+
+	end_nid = codec->start_nid + codec->num_nodes;
+	for (nid = codec->start_nid; nid < end_nid; nid++) {
+		unsigned int wid_caps = get_wcaps(codec, nid);
+		unsigned int wid_type =
+			(wid_caps & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT;
+		if (wid_type != AC_WID_PIN)
+			continue;
+		if (spec->num_pins >= ARRAY_SIZE(spec->pin_nids))
+			break;
+		spec->pin_nids[spec->num_pins] = nid;
+		spec->pin_cfgs[spec->num_pins] =
+			snd_hda_codec_read(codec, nid, 0,
+					   AC_VERB_GET_CONFIG_DEFAULT, 0);
+		spec->num_pins++;
+	}
+}
+
+static void resume_pin_configs(struct hda_codec *codec)
+{
+	struct alc_spec *spec = codec->spec;
+	int i;
+
+	for (i = 0; i < spec->num_pins; i++) {
+		hda_nid_t pin_nid = spec->pin_nids[i];
+		unsigned int pin_config = spec->pin_cfgs[i];
+		snd_hda_codec_write(codec, pin_nid, 0,
+				    AC_VERB_SET_CONFIG_DEFAULT_BYTES_0,
+				    pin_config & 0x000000ff);
+		snd_hda_codec_write(codec, pin_nid, 0,
+				    AC_VERB_SET_CONFIG_DEFAULT_BYTES_1,
+				    (pin_config & 0x0000ff00) >> 8);
+		snd_hda_codec_write(codec, pin_nid, 0,
+				    AC_VERB_SET_CONFIG_DEFAULT_BYTES_2,
+				    (pin_config & 0x00ff0000) >> 16);
+		snd_hda_codec_write(codec, pin_nid, 0,
+				    AC_VERB_SET_CONFIG_DEFAULT_BYTES_3,
+				    pin_config >> 24);
+	}
+}
+
+static int alc_resume(struct hda_codec *codec)
+{
+	resume_pin_configs(codec);
+	codec->patch_ops.init(codec);
+	snd_hda_codec_resume_amp(codec);
+	snd_hda_codec_resume_cache(codec);
+	return 0;
+}
+#else
+#define store_pin_configs(codec)
+#endif
+
 /*
  */
 static struct hda_codec_ops alc_patch_ops = {
···
 	.init = alc_init,
 	.free = alc_free,
 	.unsol_event = alc_unsol_event,
+#ifdef SND_HDA_NEEDS_RESUME
+	.resume = alc_resume,
+#endif
 #ifdef CONFIG_SND_HDA_POWER_SAVE
 	.check_power_status = alc_check_power_status,
 #endif
···
 	spec->num_mux_defs = 1;
 	spec->input_mux = &spec->private_imux;
 
+	store_pin_configs(codec);
 	return 1;
 }
 
···
 	}
 	spec->num_mixers++;
 
+	store_pin_configs(codec);
 	return 1;
 }
 
···
 	if (err < 0)
 		return err;
 
+	store_pin_configs(codec);
 	return 1;
 }
 
···
 	if (err < 0)
 		return err;
 
+	store_pin_configs(codec);
 	return 1;
 }
 
···
 	spec->mixers[spec->num_mixers] = alc269_capture_mixer;
 	spec->num_mixers++;
 
+	store_pin_configs(codec);
 	return 1;
 }
 
···
 	spec->mixers[spec->num_mixers] = alc861_capture_mixer;
 	spec->num_mixers++;
 
+	store_pin_configs(codec);
 	return 1;
 }
 
···
 	if (err < 0)
 		return err;
 
+	store_pin_configs(codec);
 	return 1;
 }
 
···
 
 	spec->mixers[spec->num_mixers] = alc662_capture_mixer;
 	spec->num_mixers++;
+
+	store_pin_configs(codec);
 	return 1;
 }