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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/cpufreq/brcmstb-avs-cpufreq.c
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@@ -42,6 +42,7 @@
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  */
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 #include <linux/cpufreq.h>
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+#include <linux/delay.h>
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 #include <linux/interrupt.h>
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 #include <linux/io.h>
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 #include <linux/module.h>
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@@ -178,6 +179,7 @@
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 	struct completion done;
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 	struct semaphore sem;
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 	struct pmap pmap;
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+	int host_irq;
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 };
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 static void __iomem *__map_region(const char *name)
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@@ -195,11 +197,36 @@
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 	return ptr;
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 }
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-static int __issue_avs_command(struct private_data *priv, int cmd, bool is_send,
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+static unsigned long wait_for_avs_command(struct private_data *priv,
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+					  unsigned long timeout)
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+{
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+	unsigned long time_left = 0;
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+	u32 val;
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+
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+	/* Event driven, wait for the command interrupt */
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+	if (priv->host_irq >= 0)
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+		return wait_for_completion_timeout(&priv->done,
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+						   msecs_to_jiffies(timeout));
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+
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+	/* Polling for command completion */
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+	do {
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+		time_left = timeout;
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+		val = readl(priv->base + AVS_MBOX_STATUS);
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+		if (val)
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+			break;
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+
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+		usleep_range(1000, 2000);
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+	} while (--timeout);
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+
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+	return time_left;
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+}
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+
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+static int __issue_avs_command(struct private_data *priv, unsigned int cmd,
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+			       unsigned int num_in, unsigned int num_out,
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 			       u32 args[])
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 {
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-	unsigned long time_left = msecs_to_jiffies(AVS_TIMEOUT);
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 	void __iomem *base = priv->base;
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+	unsigned long time_left;
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 	unsigned int i;
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 	int ret;
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 	u32 val;
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@@ -225,11 +252,9 @@
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 	/* Clear status before we begin. */
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 	writel(AVS_STATUS_CLEAR, base + AVS_MBOX_STATUS);
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-	/* We need to send arguments for this command. */
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-	if (args && is_send) {
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-		for (i = 0; i < AVS_MAX_CMD_ARGS; i++)
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-			writel(args[i], base + AVS_MBOX_PARAM(i));
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-	}
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+	/* Provide input parameters */
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+	for (i = 0; i < num_in; i++)
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+		writel(args[i], base + AVS_MBOX_PARAM(i));
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 	/* Protect from spurious interrupts. */
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 	reinit_completion(&priv->done);
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@@ -239,7 +264,7 @@
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 	writel(AVS_CPU_L2_INT_MASK, priv->avs_intr_base + AVS_CPU_L2_SET0);
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 	/* Wait for AVS co-processor to finish processing the command. */
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-	time_left = wait_for_completion_timeout(&priv->done, time_left);
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+	time_left = wait_for_avs_command(priv, AVS_TIMEOUT);
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 	/*
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 	 * If the AVS status is not in the expected range, it means AVS didn't
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@@ -256,11 +281,9 @@
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 		goto out;
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 	}
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-	/* This command returned arguments, so we read them back. */
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-	if (args && !is_send) {
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-		for (i = 0; i < AVS_MAX_CMD_ARGS; i++)
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-			args[i] = readl(base + AVS_MBOX_PARAM(i));
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-	}
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+	/* Process returned values */
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+	for (i = 0; i < num_out; i++)
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+		args[i] = readl(base + AVS_MBOX_PARAM(i));
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 	/* Clear status to tell AVS co-processor we are done. */
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 	writel(AVS_STATUS_CLEAR, base + AVS_MBOX_STATUS);
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@@ -338,7 +361,7 @@
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 	u32 args[AVS_MAX_CMD_ARGS];
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 	int ret;
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-	ret = __issue_avs_command(priv, AVS_CMD_GET_PMAP, false, args);
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+	ret = __issue_avs_command(priv, AVS_CMD_GET_PMAP, 0, 4, args);
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 	if (ret || !pmap)
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 		return ret;
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@@ -359,7 +382,7 @@
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 	args[2] = pmap->p2;
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 	args[3] = pmap->state;
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-	return __issue_avs_command(priv, AVS_CMD_SET_PMAP, true, args);
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+	return __issue_avs_command(priv, AVS_CMD_SET_PMAP, 4, 0, args);
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 }
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 static int brcm_avs_get_pstate(struct private_data *priv, unsigned int *pstate)
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@@ -367,7 +390,7 @@
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 	u32 args[AVS_MAX_CMD_ARGS];
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 	int ret;
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-	ret = __issue_avs_command(priv, AVS_CMD_GET_PSTATE, false, args);
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+	ret = __issue_avs_command(priv, AVS_CMD_GET_PSTATE, 0, 1, args);
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 	if (ret)
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 		return ret;
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 	*pstate = args[0];
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@@ -381,7 +404,8 @@
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 	args[0] = pstate;
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-	return __issue_avs_command(priv, AVS_CMD_SET_PSTATE, true, args);
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+	return __issue_avs_command(priv, AVS_CMD_SET_PSTATE, 1, 0, args);
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+
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 }
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 static u32 brcm_avs_get_voltage(void __iomem *base)
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@@ -410,7 +434,11 @@
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 	if (ret)
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 		return ERR_PTR(ret);
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-	table = devm_kcalloc(dev, AVS_PSTATE_MAX + 1, sizeof(*table),
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+	/*
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+	 * We allocate space for the 5 different P-STATES AVS,
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+	 * plus extra space for a terminating element.
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+	 */
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+	table = devm_kcalloc(dev, AVS_PSTATE_MAX + 1 + 1, sizeof(*table),
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 			     GFP_KERNEL);
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 	if (!table)
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 		return ERR_PTR(-ENOMEM);
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@@ -455,6 +483,8 @@
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 	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
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 	struct private_data *priv = policy->driver_data;
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+	cpufreq_cpu_put(policy);
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+
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 	return brcm_avs_get_frequency(priv->base);
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 }
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@@ -480,13 +510,23 @@
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 	 * AVS co-processor, not necessarily the P-state we are running at now.
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 	 * So, we get the current P-state explicitly.
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 	 */
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-	return brcm_avs_get_pstate(priv, &priv->pmap.state);
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+	ret = brcm_avs_get_pstate(priv, &priv->pmap.state);
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+	if (ret)
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+		return ret;
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+
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+	/* This is best effort. Nothing to do if it fails. */
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+	(void)__issue_avs_command(priv, AVS_CMD_S2_ENTER, 0, 0, NULL);
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+
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+	return 0;
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 }
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 static int brcm_avs_resume(struct cpufreq_policy *policy)
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 {
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 	struct private_data *priv = policy->driver_data;
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 	int ret;
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+
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+	/* This is best effort. Nothing to do if it fails. */
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+	(void)__issue_avs_command(priv, AVS_CMD_S2_EXIT, 0, 0, NULL);
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 	ret = brcm_avs_set_pmap(priv, &priv->pmap);
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 	if (ret == -EEXIST) {
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@@ -509,7 +549,7 @@
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 {
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 	struct private_data *priv;
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 	struct device *dev;
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-	int host_irq, ret;
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+	int ret;
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 	dev = &pdev->dev;
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 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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@@ -536,19 +576,14 @@
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 		goto unmap_base;
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 	}
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-	host_irq = platform_get_irq_byname(pdev, BRCM_AVS_HOST_INTR);
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-	if (host_irq < 0) {
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-		dev_err(dev, "Couldn't find interrupt %s -- %d\n",
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-			BRCM_AVS_HOST_INTR, host_irq);
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-		ret = host_irq;
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-		goto unmap_intr_base;
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-	}
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+	priv->host_irq = platform_get_irq_byname(pdev, BRCM_AVS_HOST_INTR);
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-	ret = devm_request_irq(dev, host_irq, irq_handler, IRQF_TRIGGER_RISING,
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+	ret = devm_request_irq(dev, priv->host_irq, irq_handler,
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+			       IRQF_TRIGGER_RISING,
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 			       BRCM_AVS_HOST_INTR, priv);
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-	if (ret) {
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+	if (ret && priv->host_irq >= 0) {
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 		dev_err(dev, "IRQ request failed: %s (%d) -- %d\n",
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-			BRCM_AVS_HOST_INTR, host_irq, ret);
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+			BRCM_AVS_HOST_INTR, priv->host_irq, ret);
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 		goto unmap_intr_base;
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 	}
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..
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@@ -601,7 +636,7 @@
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 	/* All cores share the same clock and thus the same policy. */
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 	cpumask_setall(policy->cpus);
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-	ret = __issue_avs_command(priv, AVS_CMD_ENABLE, false, NULL);
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+	ret = __issue_avs_command(priv, AVS_CMD_ENABLE, 0, 0, NULL);
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 	if (!ret) {
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 		unsigned int pstate;
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