ALSA: hda/realtek – Reduce click noise on Dell Precision 5820 headphone [Linux 5.1]

ALSA: hda/realtek – Reduce click noise on Dell Precision 5820 headphone [Linux 5.1]

This Linux kernel change "ALSA: hda/realtek – Reduce click noise on Dell Precision 5820 headphone" is included in the Linux 5.1 release. This change is authored by Takashi Iwai <tiwai [at] suse.de> on Wed Feb 20 16:15:45 2019 +0100. The commit for this change in Linux stable tree is c0ca5ec (patch).

ALSA: hda/realtek - Reduce click noise on Dell Precision 5820 headphone

Dell Precision 5820 with ALC3234 codec (which is equivalent with
ALC255) shows click noises at (runtime) PM resume on the headphone.
The biggest source of the noise comes from the cleared headphone pin
control at resume, which is done via the standard shutup procedure.

Although we have an override of the standard shutup callback to
replace with NOP, this would skip other needed stuff (e.g. the pull
down of headset power).  So, instead, this "fixes" the behavior of
alc_fixup_no_shutup() by introducing spec->no_shutup_pins flag.
When this flag is set, Realtek codec won't call the standard
snd_hda_shutup_pins() & co.  Now alc_fixup_no_shutup() just sets this
flag instead of overriding spec->shutup callback itself.  This allows
us to apply the similar fix for other entries easily if needed in
future.

Cc: <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>

There are 57 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 sound/pci/hda/patch_realtek.c | 57 ++++++++++++++++++++++++++-----------------
 1 file changed, 34 insertions(+), 23 deletions(-)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 1212955..5855648 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -118,6 +118,7 @@ struct alc_spec {
    unsigned int has_alc5505_dsp:1;
    unsigned int no_depop_delay:1;
    unsigned int done_hp_init:1;
+   unsigned int no_shutup_pins:1;

    /* for PLL fix */
    hda_nid_t pll_nid;
@@ -476,6 +477,14 @@ static void alc_auto_setup_eapd(struct hda_codec *codec, bool on)
        set_eapd(codec, *p, on);
 }

+static void alc_shutup_pins(struct hda_codec *codec)
+{
+   struct alc_spec *spec = codec->spec;
+
+   if (!spec->no_shutup_pins)
+       snd_hda_shutup_pins(codec);
+}
+
 /* generic shutup callback;
  * just turning off EAPD and a little pause for avoiding pop-noise
  */
@@ -486,7 +495,7 @@ static void alc_eapd_shutup(struct hda_codec *codec)
    alc_auto_setup_eapd(codec, false);
    if (!spec->no_depop_delay)
        msleep(200);
-   snd_hda_shutup_pins(codec);
+   alc_shutup_pins(codec);
 }

 /* generic EAPD initialization */
@@ -814,7 +823,7 @@ static inline void alc_shutup(struct hda_codec *codec)
    if (spec && spec->shutup)
        spec->shutup(codec);
    else
-       snd_hda_shutup_pins(codec);
+       alc_shutup_pins(codec);
 }

 static void alc_reboot_notify(struct hda_codec *codec)
@@ -2922,7 +2931,7 @@ static void alc269_shutup(struct hda_codec *codec)
            (alc_get_coef0(codec) & 0x00ff) == 0x018) {
        msleep(150);
    }
-   snd_hda_shutup_pins(codec);
+   alc_shutup_pins(codec);
 }

 static struct coef_fw alc282_coefs[] = {
@@ -3025,14 +3034,15 @@ static void alc282_shutup(struct hda_codec *codec)
    if (hp_pin_sense)
        msleep(85);

-   snd_hda_codec_write(codec, hp_pin, 0,
-               AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);
+   if (!spec->no_shutup_pins)
+       snd_hda_codec_write(codec, hp_pin, 0,
+                   AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);

    if (hp_pin_sense)
        msleep(100);

    alc_auto_setup_eapd(codec, false);
-   snd_hda_shutup_pins(codec);
+   alc_shutup_pins(codec);
    alc_write_coef_idx(codec, 0x78, coef78);
 }

@@ -3138,15 +3148,16 @@ static void alc283_shutup(struct hda_codec *codec)
    if (hp_pin_sense)
        msleep(100);

-   snd_hda_codec_write(codec, hp_pin, 0,
-               AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);
+   if (!spec->no_shutup_pins)
+       snd_hda_codec_write(codec, hp_pin, 0,
+                   AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);

    alc_update_coef_idx(codec, 0x46, 0, 3 << 12);

    if (hp_pin_sense)
        msleep(100);
    alc_auto_setup_eapd(codec, false);
-   snd_hda_shutup_pins(codec);
+   alc_shutup_pins(codec);
    alc_write_coef_idx(codec, 0x43, 0x9614);
 }

@@ -3212,14 +3223,15 @@ static void alc256_shutup(struct hda_codec *codec)
    /* NOTE: call this before clearing the pin, otherwise codec stalls */
    alc_update_coef_idx(codec, 0x46, 0, 3 << 12);

-   snd_hda_codec_write(codec, hp_pin, 0,
-               AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);
+   if (!spec->no_shutup_pins)
+       snd_hda_codec_write(codec, hp_pin, 0,
+                   AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);

    if (hp_pin_sense)
        msleep(100);

    alc_auto_setup_eapd(codec, false);
-   snd_hda_shutup_pins(codec);
+   alc_shutup_pins(codec);
 }

 static void alc225_init(struct hda_codec *codec)
@@ -3306,7 +3318,7 @@ static void alc225_shutup(struct hda_codec *codec)
        msleep(100);

    alc_auto_setup_eapd(codec, false);
-   snd_hda_shutup_pins(codec);
+   alc_shutup_pins(codec);
 }

 static void alc_default_init(struct hda_codec *codec)
@@ -3360,14 +3372,15 @@ static void alc_default_shutup(struct hda_codec *codec)
    if (hp_pin_sense)
        msleep(85);

-   snd_hda_codec_write(codec, hp_pin, 0,
-               AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);
+   if (!spec->no_shutup_pins)
+       snd_hda_codec_write(codec, hp_pin, 0,
+                   AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);

    if (hp_pin_sense)
        msleep(100);

    alc_auto_setup_eapd(codec, false);
-   snd_hda_shutup_pins(codec);
+   alc_shutup_pins(codec);
 }

 static void alc294_hp_init(struct hda_codec *codec)
@@ -3384,8 +3397,9 @@ static void alc294_hp_init(struct hda_codec *codec)

    msleep(100);

-   snd_hda_codec_write(codec, hp_pin, 0,
-               AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);
+   if (!spec->no_shutup_pins)
+       snd_hda_codec_write(codec, hp_pin, 0,
+                   AC_VERB_SET_PIN_WIDGET_CONTROL, 0x0);

    alc_update_coef_idx(codec, 0x6f, 0x000f, 0);/* Set HP depop to manual mode */
    alc_update_coefex_idx(codec, 0x58, 0x00, 0x8000, 0x8000); /* HP depop procedure start */
@@ -4981,16 +4995,12 @@ static void alc_fixup_auto_mute_via_amp(struct hda_codec *codec,
    }
 }

-static void alc_no_shutup(struct hda_codec *codec)
-{
-}
-
 static void alc_fixup_no_shutup(struct hda_codec *codec,
                const struct hda_fixup *fix, int action)
 {
    if (action == HDA_FIXUP_ACT_PRE_PROBE) {
        struct alc_spec *spec = codec->spec;
-       spec->shutup = alc_no_shutup;
+       spec->no_shutup_pins = 1;
    }
 }

@@ -6639,6 +6649,7 @@ enum {
    SND_PCI_QUIRK(0x1028, 0x0704, "Dell XPS 13 9350", ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE),
    SND_PCI_QUIRK(0x1028, 0x0706, "Dell Inspiron 7559", ALC256_FIXUP_DELL_INSPIRON_7559_SUBWOOFER),
    SND_PCI_QUIRK(0x1028, 0x0725, "Dell Inspiron 3162", ALC255_FIXUP_DELL_SPK_NOISE),
+   SND_PCI_QUIRK(0x1028, 0x0738, "Dell Precision 5820", ALC269_FIXUP_NO_SHUTUP),
    SND_PCI_QUIRK(0x1028, 0x075b, "Dell XPS 13 9360", ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE),
    SND_PCI_QUIRK(0x1028, 0x075c, "Dell XPS 27 7760", ALC298_FIXUP_SPK_VOLUME),
    SND_PCI_QUIRK(0x1028, 0x075d, "Dell AIO", ALC298_FIXUP_SPK_VOLUME),

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