ALSA: hda - Restore cleared pin controls on resume

Many codecs now clear the pin controls at suspend via snd_hda_shutup_pins()
for reducing the click noise at power-off.  But this leaves some pins
uninitialized, and they'll be never recovered after resume.

This patch adds the proper recovery of cleared pin controls on resume.
Also it adds a check of bus->shutdown so that pins won't be cleared at
module unloading.

Reference: Kernel bug 16339
	http://bugzilla.kernel.org/show_bug.cgi?id=16339

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 27 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index a3d638c8c1fd..ba2098d20ccc 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -784,6 +784,9 @@ static int read_pin_defaults(struct hda_codec *codec)
                 pin->nid = nid;
                 pin->cfg = snd_hda_codec_read(codec, nid, 0,
                                               AC_VERB_GET_CONFIG_DEFAULT, 0);
+                pin->ctrl = snd_hda_codec_read(codec, nid, 0,
+                                               AC_VERB_GET_PIN_WIDGET_CONTROL,
+                                               0);
         }
         return 0;
 }
@@ -912,15 +915,38 @@ static void restore_pincfgs(struct hda_codec *codec)
 void snd_hda_shutup_pins(struct hda_codec *codec)
 {
         int i;
+        /* don't shut up pins when unloading the driver; otherwise it breaks
+         * the default pin setup at the next load of the driver
+         */
+        if (codec->bus->shutdown)
+                return;
         for (i = 0; i < codec->init_pins.used; i++) {
                 struct hda_pincfg *pin = snd_array_elem(&codec->init_pins, i);
                 /* use read here for syncing after issuing each verb */
                 snd_hda_codec_read(codec, pin->nid, 0,
                                    AC_VERB_SET_PIN_WIDGET_CONTROL, 0);
         }
+        codec->pins_shutup = 1;
 }
 EXPORT_SYMBOL_HDA(snd_hda_shutup_pins);
 
+/* Restore the pin controls cleared previously via snd_hda_shutup_pins() */
+static void restore_shutup_pins(struct hda_codec *codec)
+{
+        int i;
+        if (!codec->pins_shutup)
+                return;
+        if (codec->bus->shutdown)
+                return;
+        for (i = 0; i < codec->init_pins.used; i++) {
+                struct hda_pincfg *pin = snd_array_elem(&codec->init_pins, i);
+                snd_hda_codec_write(codec, pin->nid, 0,
+                                    AC_VERB_SET_PIN_WIDGET_CONTROL,
+                                    pin->ctrl);
+        }
+        codec->pins_shutup = 0;
+}
+
 static void init_hda_cache(struct hda_cache_rec *cache,
                            unsigned int record_size);
 static void free_hda_cache(struct hda_cache_rec *cache);
@@ -2907,6 +2933,7 @@ static void hda_call_codec_resume(struct hda_codec *codec)
                             codec->afg ? codec->afg : codec->mfg,
                             AC_PWRST_D0);
         restore_pincfgs(codec); /* restore all current pin configs */
+        restore_shutup_pins(codec);
         hda_exec_init_verbs(codec);
         if (codec->patch_ops.resume)
                 codec->patch_ops.resume(codec);