ALSA: hda/ca0132: Fix DMic data rate for Alienware M17x R4

The commentary says to use various parameters, and lays out what
the mapping is...  The code used a 32KHz rate when the comment
says that it needs to use a 48KHz rate.  And this has been the
case since day one.

On the Alienware M17x R4, the DMic used to have exceptionally quiet
pickup and a lot of noise.  Changing the data rate fixes both of
these issues.

Searching the kernel bug tracker for ca0132-related issues shows no
mention of this being an issue for other hardware, and I have no
other hardware to test with, so a quirk is used to limit the effect
to just the M17x R4.

Signed-off-by: Alastair Bridgewater <alastair.bridgewater@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_ca0132.c b/sound/pci/hda/patch_ca0132.c
index 09ff85c..d62c56f 100644 (file)
--- a/sound/pci/hda/patch_ca0132.c
+++ b/sound/pci/hda/patch_ca0132.c
@@ -991,6 +991,7 @@ struct ca0132_spec {
 enum {
        QUIRK_NONE,
        QUIRK_ALIENWARE,
+       QUIRK_ALIENWARE_M17XR4,
        QUIRK_SBZ,
        QUIRK_R3DI,
 };
@@ -1040,6 +1041,7 @@ static const struct hda_pintbl r3di_pincfgs[] = {
 };
 
 static const struct snd_pci_quirk ca0132_quirks[] = {
+       SND_PCI_QUIRK(0x1028, 0x057b, "Alienware M17x R4", QUIRK_ALIENWARE_M17XR4),
        SND_PCI_QUIRK(0x1028, 0x0685, "Alienware 15 2015", QUIRK_ALIENWARE),
        SND_PCI_QUIRK(0x1028, 0x0688, "Alienware 17 2015", QUIRK_ALIENWARE),
        SND_PCI_QUIRK(0x1028, 0x0708, "Alienware 15 R2 2016", QUIRK_ALIENWARE),
@@ -6130,7 +6132,10 @@ static void ca0132_init_dmic(struct hda_codec *codec)
         * Bit   6: set to select Data2, clear for Data1
         * Bit   7: set to enable DMic, clear for AMic
         */
-       val = 0x23;
+       if (spec->quirk == QUIRK_ALIENWARE_M17XR4)
+               val = 0x33;
+       else
+               val = 0x23;
        /* keep a copy of dmic ctl val for enable/disable dmic purpuse */
        spec->dmic_ctl = val;
        snd_hda_codec_write(codec, spec->input_pins[0], 0,