ASoC: cs35l56: Bugfixes and efficiency improvement

Merge series from Richard Fitzgerald <rf@opensource.cirrus.com>:

First two patches are bugfixes.
Third patch skips the overhead of rebooting the amp after applying
firmware files when we know that it isn't necessary.

include/sound/cs35l56.h

@@ -223,6 +223,7 @@
 
 #define CS35L56_MBOX_CMD_AUDIO_PLAY			0x0B000001
 #define CS35L56_MBOX_CMD_AUDIO_PAUSE			0x0B000002
+#define CS35L56_MBOX_CMD_AUDIO_REINIT			0x0B000003
 #define CS35L56_MBOX_CMD_HIBERNATE_NOW			0x02000001
 #define CS35L56_MBOX_CMD_WAKEUP				0x02000002
 #define CS35L56_MBOX_CMD_PREVENT_AUTO_HIBERNATE		0x02000003

sound/soc/codecs/cs35l56.c

@@ -825,25 +825,23 @@ static void cs35l56_system_reset(struct cs35l56_private *cs35l56)
 	regcache_cache_only(cs35l56->regmap, false);
 }
 
-static void cs35l56_dsp_work(struct work_struct *work)
+static void cs35l56_secure_patch(struct cs35l56_private *cs35l56)
 {
-	struct cs35l56_private *cs35l56 = container_of(work,
-						       struct cs35l56_private,
-						       dsp_work);
-	unsigned int reg;
-	unsigned int val;
-	int ret = 0;
-
-	if (!cs35l56->init_done)
-		return;
-
-	cs35l56->dsp.part = devm_kasprintf(cs35l56->dev, GFP_KERNEL, "cs35l56%s-%02x",
-					   cs35l56->secured ? "s" : "", cs35l56->rev);
+	int ret;
 
-	if (!cs35l56->dsp.part)
-		return;
+	/* Use wm_adsp to load and apply the firmware patch and coefficient files */
+	ret = wm_adsp_power_up(&cs35l56->dsp);
+	if (ret)
+		dev_dbg(cs35l56->dev, "%s: wm_adsp_power_up ret %d\n", __func__, ret);
+	else
+		cs35l56_mbox_send(cs35l56, CS35L56_MBOX_CMD_AUDIO_REINIT);
+}
 
-	pm_runtime_get_sync(cs35l56->dev);
+static void cs35l56_patch(struct cs35l56_private *cs35l56)
+{
+	unsigned int reg;
+	unsigned int val;
+	int ret;
 
 	/*
 	 * Disable SoundWire interrupts to prevent race with IRQ work.
@@ -909,9 +907,6 @@ static void cs35l56_dsp_work(struct work_struct *work)
 err_unlock:
 	mutex_unlock(&cs35l56->irq_lock);
 err:
-	pm_runtime_mark_last_busy(cs35l56->dev);
-	pm_runtime_put_autosuspend(cs35l56->dev);
-
 	/* Re-enable SoundWire interrupts */
 	if (cs35l56->sdw_peripheral) {
 		cs35l56->sdw_irq_no_unmask = false;
@@ -920,6 +915,32 @@ static void cs35l56_dsp_work(struct work_struct *work)
 	}
 }
 
+static void cs35l56_dsp_work(struct work_struct *work)
+{
+	struct cs35l56_private *cs35l56 = container_of(work,
+						       struct cs35l56_private,
+						       dsp_work);
+
+	if (!cs35l56->init_done)
+		return;
+
+	pm_runtime_get_sync(cs35l56->dev);
+
+	/*
+	 * When the device is running in secure mode the firmware files can
+	 * only contain insecure tunings and therefore we do not need to
+	 * shutdown the firmware to apply them and can use the lower cost
+	 * reinit sequence instead.
+	 */
+	if (cs35l56->secured)
+		cs35l56_secure_patch(cs35l56);
+	else
+		cs35l56_patch(cs35l56);
+
+	pm_runtime_mark_last_busy(cs35l56->dev);
+	pm_runtime_put_autosuspend(cs35l56->dev);
+}
+
 static int cs35l56_component_probe(struct snd_soc_component *component)
 {
 	struct cs35l56_private *cs35l56 = snd_soc_component_get_drvdata(component);
@@ -1507,6 +1528,12 @@ int cs35l56_init(struct cs35l56_private *cs35l56)
 	dev_info(cs35l56->dev, "Cirrus Logic CS35L56%s Rev %02X OTP%d\n",
 		 cs35l56->secured ? "s" : "", cs35l56->rev, otpid);
 
+	/* Populate the DSP information with the revision and security state */
+	cs35l56->dsp.part = devm_kasprintf(cs35l56->dev, GFP_KERNEL, "cs35l56%s-%02x",
+					   cs35l56->secured ? "s" : "", cs35l56->rev);
+	if (!cs35l56->dsp.part)
+		return -ENOMEM;
+
 	/* Wake source and *_BLOCKED interrupts default to unmasked, so mask them */
 	regmap_write(cs35l56->regmap, CS35L56_IRQ1_MASK_20, 0xffffffff);
 	regmap_update_bits(cs35l56->regmap, CS35L56_IRQ1_MASK_1,