/* * gmidi.c -- USB MIDI Gadget Driver * * Copyright (C) 2006 Thumtronics Pty Ltd. * Developed for Thumtronics by Grey Innovation * Ben Williamson * * This software is distributed under the terms of the GNU General Public * License ("GPL") version 2, as published by the Free Software Foundation. * * This code is based in part on: * * Gadget Zero driver, Copyright (C) 2003-2004 David Brownell. * USB Audio driver, Copyright (C) 2002 by Takashi Iwai. * USB MIDI driver, Copyright (C) 2002-2005 Clemens Ladisch. * * Refer to the USB Device Class Definition for MIDI Devices: * http://www.usb.org/developers/devclass_docs/midi10.pdf */ /* #define VERBOSE_DEBUG */ #include #include #include #include #include #include "u_midi.h" /*-------------------------------------------------------------------------*/ MODULE_AUTHOR("Ben Williamson"); MODULE_LICENSE("GPL v2"); static const char longname[] = "MIDI Gadget"; USB_GADGET_COMPOSITE_OPTIONS(); static int index = SNDRV_DEFAULT_IDX1; module_param(index, int, S_IRUGO); MODULE_PARM_DESC(index, "Index value for the USB MIDI Gadget adapter."); static char *id = SNDRV_DEFAULT_STR1; module_param(id, charp, S_IRUGO); MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter."); static unsigned int buflen = 512; module_param(buflen, uint, S_IRUGO); MODULE_PARM_DESC(buflen, "MIDI buffer length"); static unsigned int qlen = 32; module_param(qlen, uint, S_IRUGO); MODULE_PARM_DESC(qlen, "USB read and write request queue length"); static unsigned int in_ports = 1; module_param(in_ports, uint, S_IRUGO); MODULE_PARM_DESC(in_ports, "Number of MIDI input ports"); static unsigned int out_ports = 1; module_param(out_ports, uint, S_IRUGO); MODULE_PARM_DESC(out_ports, "Number of MIDI output ports"); /* Thanks to Grey Innovation for donating this product ID. * * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! * Instead: allocate your own, using normal USB-IF procedures. */ #define DRIVER_VENDOR_NUM 0x17b3 /* Grey Innovation */ #define DRIVER_PRODUCT_NUM 0x0004 /* Linux-USB "MIDI Gadget" */ /* string IDs are assigned dynamically */ #define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX static struct usb_device_descriptor device_desc = { .bLength = USB_DT_DEVICE_SIZE, .bDescriptorType = USB_DT_DEVICE, /* .bcdUSB = DYNAMIC */ .bDeviceClass = USB_CLASS_PER_INTERFACE, .idVendor = cpu_to_le16(DRIVER_VENDOR_NUM), .idProduct = cpu_to_le16(DRIVER_PRODUCT_NUM), /* .iManufacturer = DYNAMIC */ /* .iProduct = DYNAMIC */ .bNumConfigurations = 1, }; static struct usb_string strings_dev[] = { [USB_GADGET_MANUFACTURER_IDX].s = "Grey Innovation", [USB_GADGET_PRODUCT_IDX].s = "MIDI Gadget", [USB_GADGET_SERIAL_IDX].s = "", [STRING_DESCRIPTION_IDX].s = "MIDI", { } /* end of list */ }; static struct usb_gadget_strings stringtab_dev = { .language = 0x0409, /* en-us */ .strings = strings_dev, }; static struct usb_gadget_strings *dev_strings[] = { &stringtab_dev, NULL, }; static struct usb_function_instance *fi_midi; static struct usb_function *f_midi; static int midi_unbind(struct usb_composite_dev *dev) { usb_put_function(f_midi); usb_put_function_instance(fi_midi); return 0; } static struct usb_configuration midi_config = { .label = "MIDI Gadget", .bConfigurationValue = 1, /* .iConfiguration = DYNAMIC */ .bmAttributes = USB_CONFIG_ATT_ONE, .MaxPower = CONFIG_USB_GADGET_VBUS_DRAW, }; static int midi_bind_config(struct usb_configuration *c) { int status; f_midi = usb_get_function(fi_midi); if (IS_ERR(f_midi)) return PTR_ERR(f_midi); status = usb_add_function(c, f_midi); if (status < 0) { usb_put_function(f_midi); return status; } return 0; } static int midi_bind(struct usb_composite_dev *cdev) { struct f_midi_opts *midi_opts; int status; fi_midi = usb_get_function_instance("midi"); if (IS_ERR(fi_midi)) return PTR_ERR(fi_midi); midi_opts = container_of(fi_midi, struct f_midi_opts, func_inst); midi_opts->index = index; midi_opts->id = id; midi_opts->in_ports = in_ports; midi_opts->out_ports = out_ports; midi_opts->buflen = buflen; midi_opts->qlen = qlen; status = usb_string_ids_tab(cdev, strings_dev); if (status < 0) goto put; device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id; device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id; midi_config.iConfiguration = strings_dev[STRING_DESCRIPTION_IDX].id; status = usb_add_config(cdev, &midi_config, midi_bind_config); if (status < 0) goto put; usb_composite_overwrite_options(cdev, &coverwrite); pr_info("%s\n", longname); return 0; put: usb_put_function_instance(fi_midi); return status; } static struct usb_composite_driver midi_driver = { .name = (char *) longname, .dev = &device_desc, .strings = dev_strings, .max_speed = USB_SPEED_HIGH, .bind = midi_bind, .unbind = midi_unbind, }; module_usb_composite_driver(midi_driver); gi/linux/net-next.git/commit/drivers/usb/host/ehci-timer.c?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>6e978b22efa1db9f6e71b24440b5f1d93e968ee3 (patch) treec666f7a26b860674848949e39a610222b0723f89 /drivers/usb/host/ehci-timer.c parent3c223c19aea85d3dda1416c187915f4a30b04b1f (diff)
cpufreq: intel_pstate: Disable energy efficiency optimization
Some Kabylake desktop processors may not reach max turbo when running in HWP mode, even if running under sustained 100% utilization. This occurs when the HWP.EPP (Energy Performance Preference) is set to "balance_power" (0x80) -- the default on most systems. It occurs because the platform BIOS may erroneously enable an energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not recommended to be enabled on this SKU. On the failing systems, this BIOS issue was not discovered when the desktop motherboard was tested with Windows, because the BIOS also neglects to provide the ACPI/CPPC table, that Windows requires to enable HWP, and so Windows runs in legacy P-state mode, where this setting has no effect. Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/usb/host/ehci-timer.c')