/* * OMAP OTG controller driver * * Based on code from tahvo-usb.c and isp1301_omap.c drivers. * * Copyright (C) 2005-2006 Nokia Corporation * Copyright (C) 2004 Texas Instruments * Copyright (C) 2004 David Brownell * * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. * * 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 #include #include #include #include #include #include #include struct otg_device { void __iomem *base; bool id; bool vbus; struct extcon_dev *extcon; struct notifier_block vbus_nb; struct notifier_block id_nb; }; #define OMAP_OTG_CTRL 0x0c #define OMAP_OTG_ASESSVLD (1 << 20) #define OMAP_OTG_BSESSEND (1 << 19) #define OMAP_OTG_BSESSVLD (1 << 18) #define OMAP_OTG_VBUSVLD (1 << 17) #define OMAP_OTG_ID (1 << 16) #define OMAP_OTG_XCEIV_OUTPUTS \ (OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \ OMAP_OTG_VBUSVLD | OMAP_OTG_ID) static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs) { u32 l; l = readl(otg_dev->base + OMAP_OTG_CTRL); l &= ~OMAP_OTG_XCEIV_OUTPUTS; l |= outputs; writel(l, otg_dev->base + OMAP_OTG_CTRL); } static void omap_otg_set_mode(struct otg_device *otg_dev) { if (!otg_dev->id && otg_dev->vbus) /* Set B-session valid. */ omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD); else if (otg_dev->vbus) /* Set A-session valid. */ omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD); else if (!otg_dev->id) /* Set B-session end to indicate no VBUS. */ omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND); } static int omap_otg_id_notifier(struct notifier_block *nb, unsigned long event, void *ptr) { struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb); otg_dev->id = event; omap_otg_set_mode(otg_dev); return NOTIFY_DONE; } static int omap_otg_vbus_notifier(struct notifier_block *nb, unsigned long event, void *ptr) { struct otg_device *otg_dev = container_of(nb, struct otg_device, vbus_nb); otg_dev->vbus = event; omap_otg_set_mode(otg_dev); return NOTIFY_DONE; } static int omap_otg_probe(struct platform_device *pdev) { const struct omap_usb_config *config = pdev->dev.platform_data; struct otg_device *otg_dev; struct extcon_dev *extcon; int ret; u32 rev; if (!config || !config->extcon) return -ENODEV; extcon = extcon_get_extcon_dev(config->extcon); if (!extcon) return -EPROBE_DEFER; otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL); if (!otg_dev) return -ENOMEM; otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]); if (IS_ERR(otg_dev->base)) return PTR_ERR(otg_dev->base); otg_dev->extcon = extcon; otg_dev->id_nb.notifier_call = omap_otg_id_notifier; otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier; ret = extcon_register_notifier(extcon, EXTCON_USB_HOST, &otg_dev->id_nb); if (ret) return ret; ret = extcon_register_notifier(extcon, EXTCON_USB, &otg_dev->vbus_nb); if (ret) { extcon_unregister_notifier(extcon, EXTCON_USB_HOST, &otg_dev->id_nb); return ret; } otg_dev->id = extcon_get_cable_state_(extcon, EXTCON_USB_HOST); otg_dev->vbus = extcon_get_cable_state_(extcon, EXTCON_USB); omap_otg_set_mode(otg_dev); rev = readl(otg_dev->base); dev_info(&pdev->dev, "OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n", (rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id, otg_dev->vbus); platform_set_drvdata(pdev, otg_dev); return 0; } static int omap_otg_remove(struct platform_device *pdev) { struct otg_device *otg_dev = platform_get_drvdata(pdev); struct extcon_dev *edev = otg_dev->extcon; extcon_unregister_notifier(edev, EXTCON_USB_HOST, &otg_dev->id_nb); extcon_unregister_notifier(edev, EXTCON_USB, &otg_dev->vbus_nb); return 0; } static struct platform_driver omap_otg_driver = { .probe = omap_otg_probe, .remove = omap_otg_remove, .driver = { .name = "omap_otg", }, }; module_platform_driver(omap_otg_driver); MODULE_DESCRIPTION("OMAP USB OTG controller driver"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Aaro Koskinen "); lue='reload'/>
authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /sound/drivers/opl4/yrw801.c
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix 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/drivers/opl4/yrw801.c')