ALSA: virtuoso: Xonar DS: add stereo upmixing to center/LFE channels
Add the possibility to route a mix of the two channels of stereo data to
the center and LFE outputs. Due to a WM8766 restriction, all surround
and back channels also get the mixed L/R signal in this case.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/oxygen/xonar_wm87x6.c b/sound/pci/oxygen/xonar_wm87x6.c
index cee07fe..aceaaa0 100644
--- a/sound/pci/oxygen/xonar_wm87x6.c
+++ b/sound/pci/oxygen/xonar_wm87x6.c
@@ -377,6 +377,24 @@
(chip->dac_mute ? WM8766_DMUTE_MASK : 0));
}
+static void update_wm8766_center_lfe_mix(struct oxygen *chip, bool mixed)
+{
+ struct xonar_wm87x6 *data = chip->model_data;
+ unsigned int reg;
+
+ /*
+ * The WM8766 can mix left and right channels, but this setting
+ * applies to all three stereo pairs.
+ */
+ reg = data->wm8766_regs[WM8766_DAC_CTRL] &
+ ~(WM8766_PL_LEFT_MASK | WM8766_PL_RIGHT_MASK);
+ if (mixed)
+ reg |= WM8766_PL_LEFT_LRMIX | WM8766_PL_RIGHT_LRMIX;
+ else
+ reg |= WM8766_PL_LEFT_LEFT | WM8766_PL_RIGHT_RIGHT;
+ wm8766_write_cached(chip, WM8766_DAC_CTRL, reg);
+}
+
static void xonar_ds_gpio_changed(struct oxygen *chip)
{
xonar_ds_handle_hp_jack(chip);
@@ -1067,6 +1085,7 @@
.set_adc_params = set_wm8776_adc_params,
.update_dac_volume = update_wm87x6_volume,
.update_dac_mute = update_wm87x6_mute,
+ .update_center_lfe_mix = update_wm8766_center_lfe_mix,
.gpio_changed = xonar_ds_gpio_changed,
.dac_tlv = wm87x6_dac_db_scale,
.model_data_size = sizeof(struct xonar_wm87x6),