/* ehci-msm.c - HSUSB Host Controller Driver Implementation * * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved. * * Partly derived from ehci-fsl.c and ehci-hcd.c * Copyright (c) 2000-2004 by David Brownell * Copyright (c) 2005 MontaVista Software * * All source code in this file is licensed under the following license except * where indicated. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 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. * You should have received a copy of the GNU General Public License * along with this program; if not, you can find it at http://www.fsf.org */ #include #include #include #include #include #include #include #include #include #include #include #include #include "ehci.h" #define MSM_USB_BASE (hcd->regs) #define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller" static const char hcd_name[] = "ehci-msm"; static struct hc_driver __read_mostly msm_hc_driver; static int ehci_msm_reset(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); int retval; ehci->caps = USB_CAPLENGTH; hcd->has_tt = 1; retval = ehci_setup(hcd); if (retval) return retval; /* select ULPI phy and clear other status/control bits in PORTSC */ writel(PORTSC_PTS_ULPI, USB_PORTSC); /* bursts of unspecified length. */ writel(0, USB_AHBBURST); /* Use the AHB transactor, allow posted data writes */ writel(0x8, USB_AHBMODE); /* Disable streaming mode and select host mode */ writel(0x13, USB_USBMODE); /* Disable ULPI_TX_PKT_EN_CLR_FIX which is valid only for HSIC */ writel(readl(USB_GENCONFIG_2) & ~ULPI_TX_PKT_EN_CLR_FIX, USB_GENCONFIG_2); return 0; } static int ehci_msm_probe(struct platform_device *pdev) { struct usb_hcd *hcd; struct resource *res; struct usb_phy *phy; int ret; dev_dbg(&pdev->dev, "ehci_msm proble\n"); hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { dev_err(&pdev->dev, "Unable to create HCD\n"); return -ENOMEM; } ret = platform_get_irq(pdev, 0); if (ret < 0) { dev_err(&pdev->dev, "Unable to get IRQ resource\n"); goto put_hcd; } hcd->irq = ret; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "Unable to get memory resource\n"); ret = -ENODEV; goto put_hcd; } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { dev_err(&pdev->dev, "ioremap failed\n"); ret = -ENOMEM; goto put_hcd; } /* * If there is an OTG driver, let it take care of PHY initialization, * clock management, powering up VBUS, mapping of registers address * space and power management. */ if (pdev->dev.of_node) phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0); else phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); if (IS_ERR(phy)) { if (PTR_ERR(phy) == -EPROBE_DEFER) { dev_err(&pdev->dev, "unable to find transceiver\n"); ret = -EPROBE_DEFER; goto put_hcd; } phy = NULL; } hcd->usb_phy = phy; device_init_wakeup(&pdev->dev, 1); if (phy && phy->otg) { /* * MSM OTG driver takes care of adding the HCD and * placing hardware into low power mode via runtime PM. */ ret = otg_set_host(phy->otg, &hcd->self); if (ret < 0) { dev_err(&pdev->dev, "unable to register with transceiver\n"); goto put_hcd; } pm_runtime_no_callbacks(&pdev->dev); pm_runtime_enable(&pdev->dev); } else { ret = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED); if (ret) goto put_hcd; } return 0; put_hcd: usb_put_hcd(hcd); return ret; } static int ehci_msm_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); device_init_wakeup(&pdev->dev, 0); pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); if (hcd->usb_phy && hcd->usb_phy->otg) otg_set_host(hcd->usb_phy->otg, NULL); else usb_remove_hcd(hcd); usb_put_hcd(hcd); return 0; } #ifdef CONFIG_PM static int ehci_msm_pm_suspend(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct ehci_hcd *ehci = hcd_to_ehci(hcd); bool do_wakeup = device_may_wakeup(dev); dev_dbg(dev, "ehci-msm PM suspend\n"); /* Only call ehci_suspend if ehci_setup has been done */ if (ehci->sbrn) return ehci_suspend(hcd, do_wakeup); return 0; } static int ehci_msm_pm_resume(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct ehci_hcd *ehci = hcd_to_ehci(hcd); dev_dbg(dev, "ehci-msm PM resume\n"); /* Only call ehci_resume if ehci_setup has been done */ if (ehci->sbrn) ehci_resume(hcd, false); return 0; } #else #define ehci_msm_pm_suspend NULL #define ehci_msm_pm_resume NULL #endif static const struct dev_pm_ops ehci_msm_dev_pm_ops = { .suspend = ehci_msm_pm_suspend, .resume = ehci_msm_pm_resume, }; static const struct acpi_device_id msm_ehci_acpi_ids[] = { { "QCOM8040", 0 }, { } }; MODULE_DEVICE_TABLE(acpi, msm_ehci_acpi_ids); static const struct of_device_id msm_ehci_dt_match[] = { { .compatible = "qcom,ehci-host", }, {} }; MODULE_DEVICE_TABLE(of, msm_ehci_dt_match); static struct platform_driver ehci_msm_driver = { .probe = ehci_msm_probe, .remove = ehci_msm_remove, .shutdown = usb_hcd_platform_shutdown, .driver = { .name = "msm_hsusb_host", .pm = &ehci_msm_dev_pm_ops, .of_match_table = msm_ehci_dt_match, .acpi_match_table = ACPI_PTR(msm_ehci_acpi_ids), }, }; static const struct ehci_driver_overrides msm_overrides __initconst = { .reset = ehci_msm_reset, }; static int __init ehci_msm_init(void) { if (usb_disabled()) return -ENODEV; pr_info("%s: " DRIVER_DESC "\n", hcd_name); ehci_init_driver(&msm_hc_driver, &msm_overrides); return platform_driver_register(&ehci_msm_driver); } module_init(ehci_msm_init); static void __exit ehci_msm_cleanup(void) { platform_driver_unregister(&ehci_msm_driver); } module_exit(ehci_msm_cleanup); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_ALIAS("platform:msm-ehci"); MODULE_LICENSE("GPL"); hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'sound/soc/codecs/tas2552.c')