[PATCH 2/4] ASoC: wm_adsp: Move DVFS control into codec driver

[Richard Fitzgerald <rf@opensource.wolfsonmicro.com>]

In theory the ADSP driver should not need to know
anything about the codec it is part of. But some codecs
need DVFS control based on ADSP clocking speed. This was
being handled by bundling part of the knowledge of this
into the ADSP driver.

This change removes this handling out of the ADSP driver.
A new macro WM_ADSP2_E() takes a callback function to be
called by the preloader widget in place of the default
handler, and this can be used to do codec-specific power
control.

The WM5102 driver has been updated to implement the DVFS.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm5102.c  |   47 ++++++++++++++++++++++++++-
 sound/soc/codecs/wm5110.c  |    2 +-
 sound/soc/codecs/wm_adsp.c |   76 +-------------------------------------------
 sound/soc/codecs/wm_adsp.h |   11 +++---
 4 files changed, 53 insertions(+), 83 deletions(-)

diff --git a/sound/soc/codecs/wm5102.c b/sound/soc/codecs/wm5102.c
index dcf1d12..47cc404 100644
--- a/sound/soc/codecs/wm5102.c
+++ b/sound/soc/codecs/wm5102.c
@@ -612,6 +612,49 @@ static int wm5102_sysclk_ev(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
+static int wm5102_adsp_power_ev(struct snd_soc_dapm_widget *w,
+		   struct snd_kcontrol *kcontrol, int event)
+{
+	struct snd_soc_codec *codec = w->codec;
+	struct arizona *arizona = dev_get_drvdata(codec->dev->parent);
+	unsigned int v;
+	int ret;
+
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, &v);
+		if (ret != 0) {
+			dev_err(codec->dev,
+				"Failed to read SYSCLK state: %d\n", ret);
+			return -EIO;
+		}
+
+		v = (v & ARIZONA_SYSCLK_FREQ_MASK) >> ARIZONA_SYSCLK_FREQ_SHIFT;
+
+		if (v >= 3) {
+			ret = arizona_dvfs_up(arizona, ARIZONA_DVFS_ADSP1_RQ);
+			if (ret != 0) {
+				dev_err(codec->dev,
+					"Failed to raise DVFS: %d\n", ret);
+				return ret;
+			}
+		}
+		break;
+
+	case SND_SOC_DAPM_PRE_PMD:
+		ret = arizona_dvfs_down(arizona, ARIZONA_DVFS_ADSP1_RQ);
+		if (ret != 0)
+			dev_warn(codec->dev,
+				 "Failed to lower DVFS: %d\n", ret);
+		break;
+
+	default:
+		break;
+	}
+
+	return wm_adsp2_early_event(w, kcontrol, event);
+}
+
 static const char *wm5102_osr_text[] = {
 	"Low power", "Normal", "High performance",
 };
@@ -1300,7 +1343,7 @@ ARIZONA_MUX_WIDGETS(ISRC2DEC2, "ISRC2DEC2"),
 ARIZONA_MUX_WIDGETS(ISRC2INT1, "ISRC2INT1"),
 ARIZONA_MUX_WIDGETS(ISRC2INT2, "ISRC2INT2"),
 
-WM_ADSP2("DSP1", 0),
+WM_ADSP2_E("DSP1", 0, wm5102_adsp_power_ev),
 
 SND_SOC_DAPM_OUTPUT("HPOUT1L"),
 SND_SOC_DAPM_OUTPUT("HPOUT1R"),
@@ -1843,7 +1886,7 @@ static int wm5102_probe(struct platform_device *pdev)
 	wm5102->core.adsp[0].mem = wm5102_dsp1_regions;
 	wm5102->core.adsp[0].num_mems = ARRAY_SIZE(wm5102_dsp1_regions);
 
-	ret = wm_adsp2_init(&wm5102->core.adsp[0], true);
+	ret = wm_adsp2_init(&wm5102->core.adsp[0]);
 	if (ret != 0)
 		return ret;
 
diff --git a/sound/soc/codecs/wm5110.c b/sound/soc/codecs/wm5110.c
index 83a7e2f..a5c9f62 100644
--- a/sound/soc/codecs/wm5110.c
+++ b/sound/soc/codecs/wm5110.c
@@ -1683,7 +1683,7 @@ static int wm5110_probe(struct platform_device *pdev)
 		wm5110->core.adsp[i].num_mems
 			= ARRAY_SIZE(wm5110_dsp1_regions);
 
-		ret = wm_adsp2_init(&wm5110->core.adsp[i], false);
+		ret = wm_adsp2_init(&wm5110->core.adsp[i]);
 		if (ret != 0)
 			return ret;
 	}
diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 53e3ab5..875a802 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -1539,35 +1539,6 @@ static void wm_adsp2_boot_work(struct work_struct *work)
 		return;
 	}
 
-	if (dsp->dvfs) {
-		ret = regmap_read(dsp->regmap,
-				  dsp->base + ADSP2_CLOCKING, &val);
-		if (ret != 0) {
-			dev_err(dsp->dev, "Failed to read clocking: %d\n", ret);
-			return;
-		}
-
-		if ((val & ADSP2_CLK_SEL_MASK) >= 3) {
-			ret = regulator_enable(dsp->dvfs);
-			if (ret != 0) {
-				dev_err(dsp->dev,
-					"Failed to enable supply: %d\n",
-					ret);
-				return;
-			}
-
-			ret = regulator_set_voltage(dsp->dvfs,
-						    1800000,
-						    1800000);
-			if (ret != 0) {
-				dev_err(dsp->dev,
-					"Failed to raise supply: %d\n",
-					ret);
-				return;
-			}
-		}
-	}
-
 	ret = wm_adsp2_ena(dsp);
 	if (ret != 0)
 		return;
@@ -1668,21 +1639,6 @@ int wm_adsp2_event(struct snd_soc_dapm_widget *w,
 		regmap_write(dsp->regmap, dsp->base + ADSP2_WDMA_CONFIG_2, 0);
 		regmap_write(dsp->regmap, dsp->base + ADSP2_RDMA_CONFIG_1, 0);
 
-		if (dsp->dvfs) {
-			ret = regulator_set_voltage(dsp->dvfs, 1200000,
-						    1800000);
-			if (ret != 0)
-				dev_warn(dsp->dev,
-					 "Failed to lower supply: %d\n",
-					 ret);
-
-			ret = regulator_disable(dsp->dvfs);
-			if (ret != 0)
-				dev_err(dsp->dev,
-					"Failed to enable supply: %d\n",
-					ret);
-		}
-
 		list_for_each_entry(ctl, &dsp->ctl_list, list)
 			ctl->enabled = 0;
 
@@ -1709,7 +1665,7 @@ err:
 }
 EXPORT_SYMBOL_GPL(wm_adsp2_event);
 
-int wm_adsp2_init(struct wm_adsp *adsp, bool dvfs)
+int wm_adsp2_init(struct wm_adsp *adsp)
 {
 	int ret;
 
@@ -1728,36 +1684,6 @@ int wm_adsp2_init(struct wm_adsp *adsp, bool dvfs)
 	INIT_LIST_HEAD(&adsp->ctl_list);
 	INIT_WORK(&adsp->boot_work, wm_adsp2_boot_work);
 
-	if (dvfs) {
-		adsp->dvfs = devm_regulator_get(adsp->dev, "DCVDD");
-		if (IS_ERR(adsp->dvfs)) {
-			ret = PTR_ERR(adsp->dvfs);
-			dev_err(adsp->dev, "Failed to get DCVDD: %d\n", ret);
-			return ret;
-		}
-
-		ret = regulator_enable(adsp->dvfs);
-		if (ret != 0) {
-			dev_err(adsp->dev, "Failed to enable DCVDD: %d\n",
-				ret);
-			return ret;
-		}
-
-		ret = regulator_set_voltage(adsp->dvfs, 1200000, 1800000);
-		if (ret != 0) {
-			dev_err(adsp->dev, "Failed to initialise DVFS: %d\n",
-				ret);
-			return ret;
-		}
-
-		ret = regulator_disable(adsp->dvfs);
-		if (ret != 0) {
-			dev_err(adsp->dev, "Failed to disable DCVDD: %d\n",
-				ret);
-			return ret;
-		}
-	}
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(wm_adsp2_init);
diff --git a/sound/soc/codecs/wm_adsp.h b/sound/soc/codecs/wm_adsp.h
index a4f6b64..8b208d1 100644
--- a/sound/soc/codecs/wm_adsp.h
+++ b/sound/soc/codecs/wm_adsp.h
@@ -56,8 +56,6 @@ struct wm_adsp {
 	int fw;
 	bool running;
 
-	struct regulator *dvfs;
-
 	struct list_head ctl_list;
 
 	struct work_struct boot_work;
@@ -67,19 +65,22 @@ struct wm_adsp {
 	SND_SOC_DAPM_PGA_E(wname, SND_SOC_NOPM, num, 0, NULL, 0, \
 		wm_adsp1_event, SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)
 
-#define WM_ADSP2(wname, num) \
+#define WM_ADSP2_E(wname, num, event_fn) \
 {	.id = snd_soc_dapm_dai_link, .name = wname " Preloader", \
-	.reg = SND_SOC_NOPM, .shift = num, .event = wm_adsp2_early_event, \
+	.reg = SND_SOC_NOPM, .shift = num, .event = event_fn, \
 	.event_flags = SND_SOC_DAPM_PRE_PMU }, \
 {	.id = snd_soc_dapm_out_drv, .name = wname, \
 	.reg = SND_SOC_NOPM, .shift = num, .event = wm_adsp2_event, \
 	.event_flags = SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD }
 
+#define WM_ADSP2(wname, num) \
+	WM_ADSP2_E(wname, num, wm_adsp2_early_event)
+
 extern const struct snd_kcontrol_new wm_adsp1_fw_controls[];
 extern const struct snd_kcontrol_new wm_adsp2_fw_controls[];
 
 int wm_adsp1_init(struct wm_adsp *adsp);
-int wm_adsp2_init(struct wm_adsp *adsp, bool dvfs);
+int wm_adsp2_init(struct wm_adsp *adsp);
 int wm_adsp1_event(struct snd_soc_dapm_widget *w,
 		   struct snd_kcontrol *kcontrol, int event);
 int wm_adsp2_early_event(struct snd_soc_dapm_widget *w,
-- 
1.7.2.5