ASoC: Refactor WM8958 DSP to support additional algorithms

In preparation for the addition of additional WM8958 algorithms
reorganise the code to make it easier to add such support later.

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

diff --git a/sound/soc/codecs/wm8958-dsp2.c b/sound/soc/codecs/wm8958-dsp2.c
index 58fe404..9c1cbe5 100644 (file)
--- a/sound/soc/codecs/wm8958-dsp2.c
+++ b/sound/soc/codecs/wm8958-dsp2.c
@@ -189,7 +189,7 @@ ok:
        return ret;
 }
 
-static void wm8958_mbc_apply(struct snd_soc_codec *codec, int mbc, int start)
+static void wm8958_dsp_start_mbc(struct snd_soc_codec *codec, int path)
 {
        struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
        struct wm8994_pdata *pdata = wm8994->pdata;
@@ -237,9 +237,9 @@ static void wm8958_dsp_apply(struct snd_soc_codec *codec, int path, int start)
 {
        struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
        int pwr_reg = snd_soc_read(codec, WM8994_POWER_MANAGEMENT_5);
-       int ena, reg, aif, i;
+       int ena, reg, aif;
 
-       switch (mbc) {
+       switch (path) {
        case 0:
                pwr_reg &= (WM8994_AIF1DAC1L_ENA | WM8994_AIF1DAC1R_ENA);
                aif = 0;
@@ -257,64 +257,34 @@ static void wm8958_dsp_apply(struct snd_soc_codec *codec, int path, int start)
                return;
        }
 
-       /* We can only enable the MBC if the AIF is enabled and we
-        * want it to be enabled. */
-       ena = pwr_reg && wm8994->mbc_ena[mbc];
+       /* Do we have both an active AIF and an active algorithm? */
+       ena = wm8994->mbc_ena[path];
+       if (!pwr_reg)
+               ena = 0;
 
        reg = snd_soc_read(codec, WM8958_DSP2_PROGRAM);
 
-       dev_dbg(codec->dev, "MBC %d startup: %d, power: %x, DSP: %x\n",
-               mbc, start, pwr_reg, reg);
+       dev_dbg(codec->dev, "DSP path %d %d startup: %d, power: %x, DSP: %x\n",
+               path, wm8994->dsp_active, start, pwr_reg, reg);
 
        if (start && ena) {
-               /* If the DSP is already running then noop */
-               if (reg & WM8958_DSP2_ENA)
-                       return;
-
-               /* If neither AIFnCLK is not yet enabled postpone */
+               /* If either AIFnCLK is not yet enabled postpone */
                if (!(snd_soc_read(codec, WM8994_AIF1_CLOCKING_1)
                      & WM8994_AIF1CLK_ENA_MASK) &&
                    !(snd_soc_read(codec, WM8994_AIF2_CLOCKING_1)
                      & WM8994_AIF2CLK_ENA_MASK))
                        return;
 
-               /* If we have MBC firmware download it */
-               if (wm8994->mbc && wm8994->mbc_ena[mbc])
-                       wm8958_dsp2_fw(codec, "MBC", wm8994->mbc, false);
-
                /* Switch the clock over to the appropriate AIF */
                snd_soc_update_bits(codec, WM8994_CLOCKING_1,
                                    WM8958_DSP2CLK_SRC | WM8958_DSP2CLK_ENA,
                                    aif << WM8958_DSP2CLK_SRC_SHIFT |
                                    WM8958_DSP2CLK_ENA);
 
-               snd_soc_update_bits(codec, WM8958_DSP2_PROGRAM,
-                                   WM8958_DSP2_ENA, WM8958_DSP2_ENA);
-
-               /* If we've got user supplied MBC settings use them */
-               if (pdata && pdata->num_mbc_cfgs) {
-                       struct wm8958_mbc_cfg *cfg
-                               = &pdata->mbc_cfgs[wm8994->mbc_cfg];
-
-                       for (i = 0; i < ARRAY_SIZE(cfg->coeff_regs); i++)
-                               snd_soc_write(codec, i + WM8958_MBC_BAND_1_K_1,
-                                             cfg->coeff_regs[i]);
-
-                       for (i = 0; i < ARRAY_SIZE(cfg->cutoff_regs); i++)
-                               snd_soc_write(codec,
-                                             i + WM8958_MBC_BAND_2_LOWER_CUTOFF_C1_1,
-                                             cfg->cutoff_regs[i]);
-               }
-
-               /* Run the DSP */
-               snd_soc_write(codec, WM8958_DSP2_EXECCONTROL,
-                             WM8958_DSP2_RUNR);
+               if (wm8994->mbc_ena[path])
+                       wm8958_dsp_start_mbc(codec, path);
 
-               /* And we're off! */
-               snd_soc_update_bits(codec, WM8958_DSP2_CONFIG,
-                                   WM8958_MBC_ENA | WM8958_MBC_SEL_MASK,
-                                   mbc << WM8958_MBC_SEL_SHIFT |
-                                   WM8958_MBC_ENA);
+               dev_dbg(codec->dev, "DSP running\n");
        } else {
                /* If the DSP is already stopped then noop */
                if (!(reg & WM8958_DSP2_ENA))
@@ -322,10 +292,16 @@ static void wm8958_dsp_apply(struct snd_soc_codec *codec, int path, int start)
 
                snd_soc_update_bits(codec, WM8958_DSP2_CONFIG,
                                    WM8958_MBC_ENA, 0); 
+               snd_soc_write(codec, WM8958_DSP2_EXECCONTROL,
+                             WM8958_DSP2_STOP);
                snd_soc_update_bits(codec, WM8958_DSP2_PROGRAM,
                                    WM8958_DSP2_ENA, 0);
                snd_soc_update_bits(codec, WM8994_CLOCKING_1,
                                    WM8958_DSP2CLK_ENA, 0);
+
+               wm8994->dsp_active = -1;
+
+               dev_dbg(codec->dev, "DSP stopped\n");
        }
 }
 
@@ -339,18 +315,33 @@ int wm8958_aif_ev(struct snd_soc_dapm_widget *w,
        case SND_SOC_DAPM_POST_PMU:
        case SND_SOC_DAPM_PRE_PMU:
                for (i = 0; i < 3; i++)
-                       wm8958_mbc_apply(codec, i, 1);
+                       wm8958_dsp_apply(codec, i, 1);
                break;
        case SND_SOC_DAPM_POST_PMD:
        case SND_SOC_DAPM_PRE_PMD:
                for (i = 0; i < 3; i++)
-                       wm8958_mbc_apply(codec, i, 0);
+                       wm8958_dsp_apply(codec, i, 0);
                break;
        }
 
        return 0;
 }
 
+/* Check if DSP2 is in use on another AIF */
+static int wm8958_dsp2_busy(struct wm8994_priv *wm8994, int aif)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(wm8994->mbc_ena); i++) {
+               if (i == aif)
+                       continue;
+               if (wm8994->mbc_ena[i])
+                       return 1;
+       }
+
+       return 0;
+}
+
 static int wm8958_put_mbc_enum(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
 {
@@ -410,23 +401,20 @@ static int wm8958_mbc_put(struct snd_kcontrol *kcontrol,
                          struct snd_ctl_elem_value *ucontrol)
 {
        int mbc = kcontrol->private_value;
-       int i;
        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
        struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
 
        if (ucontrol->value.integer.value[0] > 1)
                return -EINVAL;
 
-       for (i = 0; i < ARRAY_SIZE(wm8994->mbc_ena); i++) {
-               if (mbc != i && wm8994->mbc_ena[i]) {
-                       dev_dbg(codec->dev, "MBC %d active already\n", mbc);
-                       return -EBUSY;
-               }
+       if (wm8958_dsp2_busy(wm8994, mbc)) {
+               dev_dbg(codec->dev, "DSP2 active on %d already\n", mbc);
+               return -EBUSY;
        }
 
        wm8994->mbc_ena[mbc] = ucontrol->value.integer.value[0];
 
-       wm8958_mbc_apply(codec, mbc, wm8994->mbc_ena[mbc]);
+       wm8958_dsp_apply(codec, mbc, wm8994->mbc_ena[mbc]);
 
        return 0;
 }
@@ -462,10 +450,12 @@ void wm8958_dsp2_init(struct snd_soc_codec *codec)
        struct wm8994_pdata *pdata = wm8994->pdata;
        int ret, i;
 
+       wm8994->dsp_active = -1;
+
        snd_soc_add_controls(codec, wm8958_mbc_snd_controls,
                             ARRAY_SIZE(wm8958_mbc_snd_controls));
 
-       /* We don't require firmware and don't want to delay boot */
+       /* We don't *require* firmware and don't want to delay boot */
        request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
                                "wm8958_mbc.wfw", codec->dev, GFP_KERNEL,
                                codec, wm8958_mbc_loaded);

diff --git a/sound/soc/codecs/wm8994.h b/sound/soc/codecs/wm8994.h
index 1aa365b..a4bfde8 100644 (file)
--- a/sound/soc/codecs/wm8994.h
+++ b/sound/soc/codecs/wm8994.h
@@ -116,6 +116,7 @@ struct wm8994_priv {
        unsigned int aif1clk_disable:1;
        unsigned int aif2clk_disable:1;
 
+       int dsp_active;
        const struct firmware *cur_fw;
        const struct firmware *mbc;
 };