ALSA: hda/realtek - Fix unexpected init_amp override

The commit 1c76aa5fb48d ("ALSA: hda/realtek - Allow skipping
spec->init_amp detection") changed the way to assign spec->init_amp
field that specifies the way to initialize the amp.  Along with the
change, the commit also replaced a few fixups that set spec->init_amp
in HDA_FIXUP_ACT_PROBE with HDA_FIXUP_ACT_PRE_PROBE.  This was rather
aligning to the other fixups, and not supposed to change the actual
behavior.

However, this change turned out to cause a regression on FSC S7020,
which hit exactly the above.  The reason was that there is still one
place that overrides spec->init_amp after HDA_FIXUP_ACT_PRE_PROBE
call, namely in alc_ssid_check().

This patch fixes the regression by adding the proper spec->init_amp
override check, i.e. verifying whether it's still ALC_INIT_UNDEFINED.

Fixes: 1c76aa5fb48d ("ALSA: hda/realtek - Allow skipping spec->init_amp detection")
Cc: <stable@vger.kernel.org>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=207329
Link: https://lore.kernel.org/r/20200418190639.10082-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index dc5557d79c43e079dbeb42b90ca8a96882f1d79e..54e1c9c0a33f4f8e873a2dbccf43175de0febe1f 100644 (file)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -797,9 +797,11 @@ static void alc_ssid_check(struct hda_codec *codec, const hda_nid_t *ports)
 {
        if (!alc_subsystem_id(codec, ports)) {
                struct alc_spec *spec = codec->spec;
-               codec_dbg(codec,
-                         "realtek: Enable default setup for auto mode as fallback\n");
-               spec->init_amp = ALC_INIT_DEFAULT;
+               if (spec->init_amp == ALC_INIT_UNDEFINED) {
+                       codec_dbg(codec,
+                                 "realtek: Enable default setup for auto mode as fallback\n");
+                       spec->init_amp = ALC_INIT_DEFAULT;
+               }
        }
 }