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linux/drivers/usb/dwc3/dwc3-pci.c
Manu Gautam 8eed00b237 usb: dwc3: pci: Runtime resume child device from wq 
Driver currently resumes and increments pm usage_count
of its child device (dwc3 main) from its runtime_resume
handler. This requires dwc3 runtime_resume to perform
pm_runtime_put to decrement the pm usage_count. However
runtime_put from dwc3 happens for non pci drivers
(e.g. dwc3-if-simple.c) as well which results in dwc3
pm usage_count becoming negative after couple of
runtime suspend resume iterations. Fix this by
performing runtime_get/put from dwc3-pci driver only
using workqueue.

Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2017-10-24 12:51:19 +03:00

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/**
* dwc3-pci.c - PCI Specific glue layer
*
* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
* the License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3 0xabcd
#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI 0xabce
#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31 0xabcf
#define PCI_DEVICE_ID_INTEL_BYT 0x0f37
#define PCI_DEVICE_ID_INTEL_MRFLD 0x119e
#define PCI_DEVICE_ID_INTEL_BSW 0x22b7
#define PCI_DEVICE_ID_INTEL_SPTLP 0x9d30
#define PCI_DEVICE_ID_INTEL_SPTH 0xa130
#define PCI_DEVICE_ID_INTEL_BXT 0x0aaa
#define PCI_DEVICE_ID_INTEL_BXT_M 0x1aaa
#define PCI_DEVICE_ID_INTEL_APL 0x5aaa
#define PCI_DEVICE_ID_INTEL_KBP 0xa2b0
#define PCI_DEVICE_ID_INTEL_GLK 0x31aa
#define PCI_DEVICE_ID_INTEL_CNPLP 0x9dee
#define PCI_DEVICE_ID_INTEL_CNPH 0xa36e
#define PCI_INTEL_BXT_DSM_GUID "732b85d5-b7a7-4a1b-9ba0-4bbd00ffd511"
#define PCI_INTEL_BXT_FUNC_PMU_PWR 4
#define PCI_INTEL_BXT_STATE_D0 0
#define PCI_INTEL_BXT_STATE_D3 3
/**
* struct dwc3_pci - Driver private structure
* @dwc3: child dwc3 platform_device
* @pci: our link to PCI bus
* @guid: _DSM GUID
* @has_dsm_for_pm: true for devices which need to run _DSM on runtime PM
*/
struct dwc3_pci {
struct platform_device *dwc3;
struct pci_dev *pci;
guid_t guid;
unsigned int has_dsm_for_pm:1;
struct work_struct wakeup_work;
};
static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
static const struct acpi_gpio_params cs_gpios = { 1, 0, false };
static const struct acpi_gpio_mapping acpi_dwc3_byt_gpios[] = {
{ "reset-gpios", &reset_gpios, 1 },
{ "cs-gpios", &cs_gpios, 1 },
{ },
};
static int dwc3_pci_quirks(struct dwc3_pci *dwc)
{
struct platform_device *dwc3 = dwc->dwc3;
struct pci_dev *pdev = dwc->pci;
if (pdev->vendor == PCI_VENDOR_ID_AMD &&
pdev->device == PCI_DEVICE_ID_AMD_NL_USB) {
struct property_entry properties[] = {
PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
PROPERTY_ENTRY_U8("snps,lpm-nyet-threshold", 0xf),
PROPERTY_ENTRY_BOOL("snps,u2exit_lfps_quirk"),
PROPERTY_ENTRY_BOOL("snps,u2ss_inp3_quirk"),
PROPERTY_ENTRY_BOOL("snps,req_p1p2p3_quirk"),
PROPERTY_ENTRY_BOOL("snps,del_p1p2p3_quirk"),
PROPERTY_ENTRY_BOOL("snps,del_phy_power_chg_quirk"),
PROPERTY_ENTRY_BOOL("snps,lfps_filter_quirk"),
PROPERTY_ENTRY_BOOL("snps,rx_detect_poll_quirk"),
PROPERTY_ENTRY_BOOL("snps,tx_de_emphasis_quirk"),
PROPERTY_ENTRY_U8("snps,tx_de_emphasis", 1),
/*
* FIXME these quirks should be removed when AMD NL
* tapes out
*/
PROPERTY_ENTRY_BOOL("snps,disable_scramble_quirk"),
PROPERTY_ENTRY_BOOL("snps,dis_u3_susphy_quirk"),
PROPERTY_ENTRY_BOOL("snps,dis_u2_susphy_quirk"),
PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
{ },
};
return platform_device_add_properties(dwc3, properties);
}
if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
int ret;
struct property_entry properties[] = {
PROPERTY_ENTRY_STRING("dr_mode", "peripheral"),
PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
{ }
};
ret = platform_device_add_properties(dwc3, properties);
if (ret < 0)
return ret;
if (pdev->device == PCI_DEVICE_ID_INTEL_BXT ||
pdev->device == PCI_DEVICE_ID_INTEL_BXT_M) {
guid_parse(PCI_INTEL_BXT_DSM_GUID, &dwc->guid);
dwc->has_dsm_for_pm = true;
}
if (pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
struct gpio_desc *gpio;
ret = devm_acpi_dev_add_driver_gpios(&pdev->dev,
acpi_dwc3_byt_gpios);
if (ret)
dev_dbg(&pdev->dev, "failed to add mapping table\n");
/*
* These GPIOs will turn on the USB2 PHY. Note that we have to
* put the gpio descriptors again here because the phy driver
* might want to grab them, too.
*/
gpio = gpiod_get_optional(&pdev->dev, "cs", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
gpiod_set_value_cansleep(gpio, 1);
gpiod_put(gpio);
gpio = gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
if (gpio) {
gpiod_set_value_cansleep(gpio, 1);
gpiod_put(gpio);
usleep_range(10000, 11000);
}
}
}
if (pdev->vendor == PCI_VENDOR_ID_SYNOPSYS &&
(pdev->device == PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3 ||
pdev->device == PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI ||
pdev->device == PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31)) {
struct property_entry properties[] = {
PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
{ },
};
return platform_device_add_properties(dwc3, properties);
}
return 0;
}
#ifdef CONFIG_PM
static void dwc3_pci_resume_work(struct work_struct *work)
{
struct dwc3_pci *dwc = container_of(work, struct dwc3_pci, wakeup_work);
struct platform_device *dwc3 = dwc->dwc3;
int ret;
ret = pm_runtime_get_sync(&dwc3->dev);
if (ret)
return;
pm_runtime_mark_last_busy(&dwc3->dev);
pm_runtime_put_sync_autosuspend(&dwc3->dev);
}
#endif
static int dwc3_pci_probe(struct pci_dev *pci,
const struct pci_device_id *id)
{
struct dwc3_pci *dwc;
struct resource res[2];
int ret;
struct device *dev = &pci->dev;
ret = pcim_enable_device(pci);
if (ret) {
dev_err(dev, "failed to enable pci device\n");
return -ENODEV;
}
pci_set_master(pci);
dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
if (!dwc)
return -ENOMEM;
dwc->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
if (!dwc->dwc3)
return -ENOMEM;
memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
res[0].start = pci_resource_start(pci, 0);
res[0].end = pci_resource_end(pci, 0);
res[0].name = "dwc_usb3";
res[0].flags = IORESOURCE_MEM;
res[1].start = pci->irq;
res[1].name = "dwc_usb3";
res[1].flags = IORESOURCE_IRQ;
ret = platform_device_add_resources(dwc->dwc3, res, ARRAY_SIZE(res));
if (ret) {
dev_err(dev, "couldn't add resources to dwc3 device\n");
return ret;
}
dwc->pci = pci;
dwc->dwc3->dev.parent = dev;
ACPI_COMPANION_SET(&dwc->dwc3->dev, ACPI_COMPANION(dev));
ret = dwc3_pci_quirks(dwc);
if (ret)
goto err;
ret = platform_device_add(dwc->dwc3);
if (ret) {
dev_err(dev, "failed to register dwc3 device\n");
goto err;
}
device_init_wakeup(dev, true);
pci_set_drvdata(pci, dwc);
pm_runtime_put(dev);
#ifdef CONFIG_PM
INIT_WORK(&dwc->wakeup_work, dwc3_pci_resume_work);
#endif
return 0;
err:
platform_device_put(dwc->dwc3);
return ret;
}
static void dwc3_pci_remove(struct pci_dev *pci)
{
struct dwc3_pci *dwc = pci_get_drvdata(pci);
#ifdef CONFIG_PM
cancel_work_sync(&dwc->wakeup_work);
#endif
device_init_wakeup(&pci->dev, false);
pm_runtime_get(&pci->dev);
platform_device_unregister(dwc->dwc3);
}
static const struct pci_device_id dwc3_pci_id_table[] = {
{
PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
},
{
PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
},
{
PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BSW), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BYT), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MRFLD), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SPTLP), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SPTH), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BXT), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BXT_M), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_APL), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_KBP), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_GLK), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CNPLP), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CNPH), },
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_NL_USB), },
{ } /* Terminating Entry */
};
MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);
#if defined(CONFIG_PM) || defined(CONFIG_PM_SLEEP)
static int dwc3_pci_dsm(struct dwc3_pci *dwc, int param)
{
union acpi_object *obj;
union acpi_object tmp;
union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
if (!dwc->has_dsm_for_pm)
return 0;
tmp.type = ACPI_TYPE_INTEGER;
tmp.integer.value = param;
obj = acpi_evaluate_dsm(ACPI_HANDLE(&dwc->pci->dev), &dwc->guid,
1, PCI_INTEL_BXT_FUNC_PMU_PWR, &argv4);
if (!obj) {
dev_err(&dwc->pci->dev, "failed to evaluate _DSM\n");
return -EIO;
}
ACPI_FREE(obj);
return 0;
}
#endif /* CONFIG_PM || CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
static int dwc3_pci_runtime_suspend(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
if (device_can_wakeup(dev))
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D3);
return -EBUSY;
}
static int dwc3_pci_runtime_resume(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
int ret;
ret = dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
if (ret)
return ret;
queue_work(pm_wq, &dwc->wakeup_work);
return 0;
}
#endif /* CONFIG_PM */
#ifdef CONFIG_PM_SLEEP
static int dwc3_pci_suspend(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D3);
}
static int dwc3_pci_resume(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops dwc3_pci_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_suspend, dwc3_pci_resume)
SET_RUNTIME_PM_OPS(dwc3_pci_runtime_suspend, dwc3_pci_runtime_resume,
NULL)
};
static struct pci_driver dwc3_pci_driver = {
.name = "dwc3-pci",
.id_table = dwc3_pci_id_table,
.probe = dwc3_pci_probe,
.remove = dwc3_pci_remove,
.driver = {
.pm = &dwc3_pci_dev_pm_ops,
}
};
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 PCI Glue Layer");
module_pci_driver(dwc3_pci_driver);
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