struct wm_hubs_data *hubs = snd_soc_codec_get_drvdata(codec);
u16 reg, reg_l, reg_r, dcs_cfg;
+ /* If we're using a digital only path and have a previously
+ * callibrated DC servo offset stored then use that. */
+ if (hubs->class_w && hubs->class_w_dcs) {
+ dev_dbg(codec->dev, "Using cached DC servo offset %x\n",
+ hubs->class_w_dcs);
+ snd_soc_write(codec, WM8993_DC_SERVO_3, hubs->class_w_dcs);
+ wait_for_dc_servo(codec,
+ WM8993_DCS_TRIG_DAC_WR_0 |
+ WM8993_DCS_TRIG_DAC_WR_1);
+ return;
+ }
+
/* Set for 32 series updates */
snd_soc_update_bits(codec, WM8993_DC_SERVO_1,
WM8993_DCS_SERIES_NO_01_MASK,
wait_for_dc_servo(codec,
WM8993_DCS_TRIG_SERIES_0 | WM8993_DCS_TRIG_SERIES_1);
+ /* Different chips in the family support different readback
+ * methods.
+ */
+ switch (hubs->dcs_readback_mode) {
+ case 0:
+ reg_l = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_1)
+ & WM8993_DCS_INTEG_CHAN_0_MASK;;
+ reg_r = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_2)
+ & WM8993_DCS_INTEG_CHAN_1_MASK;
+ break;
+ case 1:
+ reg = snd_soc_read(codec, WM8993_DC_SERVO_3);
+ reg_l = (reg & WM8993_DCS_DAC_WR_VAL_1_MASK)
+ >> WM8993_DCS_DAC_WR_VAL_1_SHIFT;
+ reg_r = reg & WM8993_DCS_DAC_WR_VAL_0_MASK;
+ break;
+ default:
+ WARN(1, "Unknown DCS readback method");
+ break;
+ }
+
+ dev_dbg(codec->dev, "DCS input: %x %x\n", reg_l, reg_r);
+
/* Apply correction to DC servo result */
if (hubs->dcs_codes) {
dev_dbg(codec->dev, "Applying %d code DC servo correction\n",
hubs->dcs_codes);
- /* Different chips in the family support different
- * readback methods.
- */
- switch (hubs->dcs_readback_mode) {
- case 0:
- reg_l = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_1)
- & WM8993_DCS_INTEG_CHAN_0_MASK;;
- reg_r = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_2)
- & WM8993_DCS_INTEG_CHAN_1_MASK;
- break;
- case 1:
- reg = snd_soc_read(codec, WM8993_DC_SERVO_3);
- reg_l = (reg & WM8993_DCS_DAC_WR_VAL_1_MASK)
- >> WM8993_DCS_DAC_WR_VAL_1_SHIFT;
- reg_r = reg & WM8993_DCS_DAC_WR_VAL_0_MASK;
- break;
- default:
- WARN(1, "Unknown DCS readback method");
- break;
- }
-
- dev_dbg(codec->dev, "DCS input: %x %x\n", reg_l, reg_r);
-
/* HPOUT1L */
if (reg_l + hubs->dcs_codes > 0 &&
reg_l + hubs->dcs_codes < 0xff)
wait_for_dc_servo(codec,
WM8993_DCS_TRIG_DAC_WR_0 |
WM8993_DCS_TRIG_DAC_WR_1);
+ } else {
+ dcs_cfg = reg_l << WM8993_DCS_DAC_WR_VAL_1_SHIFT;
+ dcs_cfg |= reg_r;
}
+
+ /* Save the callibrated offset if we're in class W mode and
+ * therefore don't have any analogue signal mixed in. */
+ if (hubs->class_w)
+ hubs->class_w_dcs = dcs_cfg;
}
/*
ret = snd_soc_put_volsw_2r(kcontrol, ucontrol);
+ /* Updating the analogue gains invalidates the DC servo cache */
+ hubs->class_w_dcs = 0;
+
/* If we're applying an offset correction then updating the
* callibration would be likely to introduce further offsets. */
if (hubs->dcs_codes)