ASoC: Implement new DC servo readback mode for late WM8994 revisions

Later WM8994 devices implement a new DC servo readback mode with the
register used to access the offset moved to register 0x59. Implement
support for this and enable it on the appropriate devices.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

diff --git a/include/linux/mfd/wm8994/registers.h b/include/linux/mfd/wm8994/registers.h
index f3ee842..6152914 100644 (file)
--- a/include/linux/mfd/wm8994/registers.h
+++ b/include/linux/mfd/wm8994/registers.h
@@ -72,6 +72,7 @@
 #define WM8994_DC_SERVO_2                       0x55
 #define WM8994_DC_SERVO_4                       0x57
 #define WM8994_DC_SERVO_READBACK                0x58
+#define WM8994_DC_SERVO_4E                     0x59
 #define WM8994_ANALOGUE_HP_1                    0x60
 #define WM8958_MIC_DETECT_1                     0xD0
 #define WM8958_MIC_DETECT_2                     0xD1

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 09e680a..c095689 100644 (file)
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -107,6 +107,7 @@ static int wm8994_volatile(struct snd_soc_codec *codec, unsigned int reg)
        case WM8994_LDO_2:
        case WM8958_DSP2_EXECCONTROL:
        case WM8958_MIC_DETECT_3:
+       case WM8994_DC_SERVO_4E:
                return 1;
        default:
                return 0;
@@ -2978,7 +2979,7 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
                        wm8994->hubs.series_startup = 1;
                        break;
                default:
-                       wm8994->hubs.dcs_readback_mode = 1;
+                       wm8994->hubs.dcs_readback_mode = 2;
                        break;
                }
 

diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c
index 4cc2d56..84a84f4 100644 (file)
--- a/sound/soc/codecs/wm_hubs.c
+++ b/sound/soc/codecs/wm_hubs.c
@@ -18,6 +18,7 @@
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
+#include <linux/mfd/wm8994/registers.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -116,14 +117,23 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
 {
        struct wm_hubs_data *hubs = snd_soc_codec_get_drvdata(codec);
        s8 offset;
-       u16 reg, reg_l, reg_r, dcs_cfg;
+       u16 reg, reg_l, reg_r, dcs_cfg, dcs_reg;
+
+       switch (hubs->dcs_readback_mode) {
+       case 2:
+               dcs_reg = WM8994_DC_SERVO_4E;
+               break;
+       default:
+               dcs_reg = WM8993_DC_SERVO_3;
+               break;
+       }
 
        /* 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);
+               snd_soc_write(codec, dcs_reg, hubs->class_w_dcs);
                wait_for_dc_servo(codec,
                                  WM8993_DCS_TRIG_DAC_WR_0 |
                                  WM8993_DCS_TRIG_DAC_WR_1);
@@ -154,8 +164,9 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
                reg_r = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_2)
                        & WM8993_DCS_INTEG_CHAN_1_MASK;
                break;
+       case 2:
        case 1:
-               reg = snd_soc_read(codec, WM8993_DC_SERVO_3);
+               reg = snd_soc_read(codec, dcs_reg);
                reg_r = (reg & WM8993_DCS_DAC_WR_VAL_1_MASK)
                        >> WM8993_DCS_DAC_WR_VAL_1_SHIFT;
                reg_l = reg & WM8993_DCS_DAC_WR_VAL_0_MASK;
@@ -185,7 +196,7 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
                dev_dbg(codec->dev, "DCS result: %x\n", dcs_cfg);
 
                /* Do it */
-               snd_soc_write(codec, WM8993_DC_SERVO_3, dcs_cfg);
+               snd_soc_write(codec, dcs_reg, dcs_cfg);
                wait_for_dc_servo(codec,
                                  WM8993_DCS_TRIG_DAC_WR_0 |
                                  WM8993_DCS_TRIG_DAC_WR_1);