diff options
| -rw-r--r-- | drivers/usb/otg/ab5500-usb.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/usb/otg/ab5500-usb.c b/drivers/usb/otg/ab5500-usb.c index c57234d92be..1d38576a8f4 100644 --- a/drivers/usb/otg/ab5500-usb.c +++ b/drivers/usb/otg/ab5500-usb.c @@ -21,6 +21,7 @@ #include <linux/kernel_stat.h> #include <mach/gpio.h> #include <mach/reboot_reasons.h> +#include <linux/pm_qos_params.h> /* AB5500 USB macros */ @@ -46,6 +47,10 @@ #define AB5500_USB_LINK_STATUS_MASK_V2 0xF8 #define USB_PROBE_DELAY 1000 /* 1 seconds */ +#define USB_LIMIT (200) /* If we have more than 200 irqs per second */ + +static struct pm_qos_request_list usb_pm_qos_latency; +static bool usb_pm_qos_is_latency_0; #define PUBLIC_ID_BACKUPRAM1 (U5500_BACKUPRAM1_BASE + 0x0FC0) #define MAX_USB_SERIAL_NUMBER_LEN 31 @@ -145,6 +150,42 @@ static void ab5500_usb_wd_workaround(struct ab5500_usb *ab) udelay(AB5500_WATCHDOG_DELAY_US); } +static void ab5500_usb_load(struct work_struct *work) +{ + int cpu; + unsigned int num_irqs = 0; + static unsigned int old_num_irqs = UINT_MAX; + struct delayed_work *work_usb_workaround = to_delayed_work(work); + struct ab5500_usb *ab = container_of(work_usb_workaround, + struct ab5500_usb, work_usb_workaround); + + for_each_online_cpu(cpu) + num_irqs += kstat_irqs_cpu(IRQ_DB5500_USBOTG, cpu); + + if ((num_irqs > old_num_irqs) && + (num_irqs - old_num_irqs) > USB_LIMIT) { + + if (!usb_pm_qos_is_latency_0) { + + pm_qos_add_request(&usb_pm_qos_latency, + PM_QOS_CPU_DMA_LATENCY, 0); + usb_pm_qos_is_latency_0 = true; + } + } else { + + if (usb_pm_qos_is_latency_0) { + + pm_qos_remove_request(&usb_pm_qos_latency); + usb_pm_qos_is_latency_0 = false; + } + } + old_num_irqs = num_irqs; + + schedule_delayed_work_on(0, + &ab->work_usb_workaround, + msecs_to_jiffies(USB_PROBE_DELAY)); +} + static void ab5500_usb_phy_enable(struct ab5500_usb *ab, bool sel_host) { u8 bit; @@ -166,6 +207,11 @@ static void ab5500_usb_phy_enable(struct ab5500_usb *ab, bool sel_host) } ux500_restore_context(); + if (sel_host) { + schedule_delayed_work_on(0, + &ab->work_usb_workaround, + msecs_to_jiffies(USB_PROBE_DELAY)); + } abx500_mask_and_set_register_interruptible(ab->dev, AB5500_BANK_USB, AB5500_USB_PHY_CTRL_REG, @@ -191,6 +237,15 @@ static void ab5500_usb_phy_disable(struct ab5500_usb *ab, bool sel_host) clk_disable(ab->sysclk); regulator_disable(ab->v_ape); ab->usb_gpio->disable(); + + if (sel_host) { + if (usb_pm_qos_is_latency_0) { + + pm_qos_remove_request(&usb_pm_qos_latency); + usb_pm_qos_is_latency_0 = false; + } + cancel_delayed_work_sync(&ab->work_usb_workaround); + } } #define ab5500_usb_peri_phy_en(ab) ab5500_usb_phy_enable(ab, false) @@ -724,6 +779,9 @@ static int __devinit ab5500_usb_probe(struct platform_device *pdev) */ INIT_DELAYED_WORK(&ab->dwork, ab5500_usb_delayed_work); + INIT_DELAYED_WORK_DEFERRABLE(&ab->work_usb_workaround, + ab5500_usb_load); + err = otg_set_transceiver(&ab->otg); if (err) dev_err(&pdev->dev, "Can't register transceiver\n"); |