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Commit 9dc49c3c authored by Vamsi Krishna's avatar Vamsi Krishna
Browse files

dwc3: Add module param to allow irq affinity to different cpu cores 



USB3.0 can generate high number of interrupts during peak data rates.
By default all the interrupts and resulting soft irqs will be
executed on Core0 resulting watchdog barks. Add module param allows
usb interrupt preference to different cpu core.

Change-Id: Ie86b1c4a631986a676692f6464b93fdebf52ecba
Signed-off-by: default avatarVamsi Krishna <vskrishn@codeaurora.org>
parent b275af98

drivers/usb/dwc3/dwc3-msm.c

+34 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/cpu.h>

#include <linux/platform_device.h>

#include <linux/dma-mapping.h>

#include <linux/pm_runtime.h>
@@ -51,6 +52,11 @@ 
#include "dbm.h"

#include "debug.h"



/* cpu to fix usb interrupt */

static int cpu_to_affin;

module_param(cpu_to_affin, int, S_IRUGO|S_IWUSR);

MODULE_PARM_DESC(cpu_to_affin, "affin usb irq to this cpu");



/* ADC threshold values */

static int adc_low_threshold = 700;

module_param(adc_low_threshold, int, S_IRUGO | S_IWUSR);
@@ -201,6 +207,9 @@ struct dwc3_msm { 
	bool power_collapse; /* power collapse on cable disconnect */

	bool power_collapse_por; /* perform POR sequence after power collapse */

	bool enable_suspend_event;



	unsigned int		irq_to_affin;

	struct notifier_block	dwc3_cpu_notifier;

};



#define USB_HSPHY_3P3_VOL_MIN		3050000 /* uV */
@@ -2163,6 +2172,22 @@ static irqreturn_t dwc3_pmic_id_irq(int irq, void *data) 
	return IRQ_HANDLED;

}



static int dwc3_cpu_notifier_cb(struct notifier_block *nfb,

		unsigned long action, void *hcpu)

{

	uint32_t cpu = (uintptr_t)hcpu;

	struct dwc3_msm *mdwc =

			container_of(nfb, struct dwc3_msm, dwc3_cpu_notifier);



	if (cpu == cpu_to_affin && action == CPU_ONLINE) {

		pr_debug("%s: cpu online:%u irq:%d\n", __func__,

				cpu_to_affin, mdwc->irq_to_affin);

		irq_set_affinity(mdwc->irq_to_affin, get_cpu_mask(cpu));

	}



	return NOTIFY_OK;

}



static void dwc3_adc_notification(enum qpnp_tm_state state, void *ctx)

{

	struct dwc3_msm *mdwc = ctx;
@@ -2902,6 +2927,12 @@ static int dwc3_msm_probe(struct platform_device *pdev) 
			dev_err(&pdev->dev, "Fail to setup dwc3 setup cdev\n");

	}



	mdwc->irq_to_affin = platform_get_irq(mdwc->dwc3, 0);

	mdwc->dwc3_cpu_notifier.notifier_call = dwc3_cpu_notifier_cb;



	if (cpu_to_affin)

		register_cpu_notifier(&mdwc->dwc3_cpu_notifier);



	device_init_wakeup(mdwc->dev, 1);

	pm_stay_awake(mdwc->dev);

	dwc3_msm_debugfs_init(mdwc);
@@ -2973,6 +3004,9 @@ static int dwc3_msm_remove(struct platform_device *pdev) 
{

	struct dwc3_msm	*mdwc = platform_get_drvdata(pdev);



	if (cpu_to_affin)

		unregister_cpu_notifier(&mdwc->dwc3_cpu_notifier);



	pm_runtime_disable(mdwc->dev);

	pm_runtime_set_suspended(mdwc->dev);

	device_wakeup_disable(mdwc->dev);