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cpufreq: brcmstb-avs-cpufreq: Support polling AVS firmware

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In case the interrupt towards the host is never raised, yet the AVS
firmware responds correctly within the alloted time, allow supporting a
polling mode.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Markus Mayer <mmayer@broadcom.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Florian Fainelli 2020-05-28 11:20:13 -07:00 committed by Viresh Kumar
parent b75acfb45e
commit 08535ccdd7
1 changed files with 34 additions and 13 deletions
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47
drivers/cpufreq/brcmstb-avs-cpufreq.c
View file

@ -42,6 +42,7 @@
*/
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
@ -178,6 +179,7 @@ struct private_data {
struct completion done;
struct semaphore sem;
struct pmap pmap;
int host_irq;
};
static void __iomem *__map_region(const char *name)
@ -195,12 +197,36 @@ static void __iomem *__map_region(const char *name)
return ptr;
}
static unsigned long wait_for_avs_command(struct private_data *priv,
unsigned long timeout)
{
unsigned long time_left = 0;
u32 val;
/* Event driven, wait for the command interrupt */
if (priv->host_irq >= 0)
return wait_for_completion_timeout(&priv->done,
msecs_to_jiffies(timeout));
/* Polling for command completion */
do {
time_left = timeout;
val = readl(priv->base + AVS_MBOX_STATUS);
if (val)
break;
usleep_range(1000, 2000);
} while (--timeout);
return time_left;
}
static int __issue_avs_command(struct private_data *priv, unsigned int cmd,
unsigned int num_in, unsigned int num_out,
u32 args[])
{
unsigned long time_left = msecs_to_jiffies(AVS_TIMEOUT);
void __iomem *base = priv->base;
unsigned long time_left;
unsigned int i;
int ret;
u32 val;
@ -238,7 +264,7 @@ static int __issue_avs_command(struct private_data *priv, unsigned int cmd,
writel(AVS_CPU_L2_INT_MASK, priv->avs_intr_base + AVS_CPU_L2_SET0);
/* Wait for AVS co-processor to finish processing the command. */
time_left = wait_for_completion_timeout(&priv->done, time_left);
time_left = wait_for_avs_command(priv, AVS_TIMEOUT);
/*
* If the AVS status is not in the expected range, it means AVS didn't
@ -509,7 +535,7 @@ static int brcm_avs_prepare_init(struct platform_device *pdev)
{
struct private_data *priv;
struct device *dev;
int host_irq, ret;
int ret;
dev = &pdev->dev;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@ -536,19 +562,14 @@ static int brcm_avs_prepare_init(struct platform_device *pdev)
goto unmap_base;
}
host_irq = platform_get_irq_byname(pdev, BRCM_AVS_HOST_INTR);
if (host_irq < 0) {
dev_err(dev, "Couldn't find interrupt %s -- %d\n",
BRCM_AVS_HOST_INTR, host_irq);
ret = host_irq;
goto unmap_intr_base;
}
priv->host_irq = platform_get_irq_byname(pdev, BRCM_AVS_HOST_INTR);
ret = devm_request_irq(dev, host_irq, irq_handler, IRQF_TRIGGER_RISING,
ret = devm_request_irq(dev, priv->host_irq, irq_handler,
IRQF_TRIGGER_RISING,
BRCM_AVS_HOST_INTR, priv);
if (ret) {
if (ret && priv->host_irq >= 0) {
dev_err(dev, "IRQ request failed: %s (%d) -- %d\n",
BRCM_AVS_HOST_INTR, host_irq, ret);
BRCM_AVS_HOST_INTR, priv->host_irq, ret);
goto unmap_intr_base;
}