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path: root/sound/usb/quirks.h
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#ifndef __USBAUDIO_QUIRKS_H
#define __USBAUDIO_QUIRKS_H

struct audioformat;
struct snd_usb_endpoint;
struct snd_usb_substream;

int snd_usb_create_quirk(struct snd_usb_audio *chip,
			 struct usb_interface *iface,
			 struct usb_driver *driver,
			 const struct snd_usb_audio_quirk *quirk);

int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
				  int iface,
				  int altno);

int snd_usb_apply_boot_quirk(struct usb_device *dev,
			     struct usb_interface *intf,
			     const struct snd_usb_audio_quirk *quirk,
			     unsigned int usb_id);

void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
			      struct audioformat *fmt);

bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip);

int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
				 struct audioformat *fp);

void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);

void snd_usb_set_interface_quirk(struct usb_device *dev);
void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
			   __u8 request, __u8 requesttype, __u16 value,
			   __u16 index, void *data, __u16 size);

int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
			      struct audioformat *fmt);

u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
					struct audioformat *fp,
					unsigned int sample_bytes);

#endif /* __USBAUDIO_QUIRKS_H */
% 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 'security/selinux/ss/status.c')