/*
 * Apple Onboard Audio driver core
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/list.h>
#include "../aoa.h"
#include "alsa.h"

MODULE_DESCRIPTION("Apple Onboard Audio Sound Driver");
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_LICENSE("GPL");

/* We allow only one fabric. This simplifies things,
 * and more don't really make that much sense */
static struct aoa_fabric *fabric;
static LIST_HEAD(codec_list);

static int attach_codec_to_fabric(struct aoa_codec *c)
{
	int err;

	if (!try_module_get(c->owner))
		return -EBUSY;
	/* found_codec has to be assigned */
	err = -ENOENT;
	if (fabric->found_codec)
		err = fabric->found_codec(c);
	if (err) {
		module_put(c->owner);
		printk(KERN_ERR "snd-aoa: fabric didn't like codec %s\n",
				c->name);
		return err;
	}
	c->fabric = fabric;

	err = 0;
	if (c->init)
		err = c->init(c);
	if (err) {
		printk(KERN_ERR "snd-aoa: codec %s didn't init\n", c->name);
		c->fabric = NULL;
		if (fabric->remove_codec)
			fabric->remove_codec(c);
		module_put(c->owner);
		return err;
	}
	if (fabric->attached_codec)
		fabric->attached_codec(c);
	return 0;
}

int aoa_codec_register(struct aoa_codec *codec)
{
	int err = 0;

	/* if there's a fabric already, we can tell if we
	 * will want to have this codec, so propagate error
	 * through. Otherwise, this will happen later... */
	if (fabric)
		err = attach_codec_to_fabric(codec);
	if (!err)
		list_add(&codec->list, &codec_list);
	return err;
}
EXPORT_SYMBOL_GPL(aoa_codec_register);

void aoa_codec_unregister(struct aoa_codec *codec)
{
	list_del(&codec->list);
	if (codec->fabric && codec->exit)
		codec->exit(codec);
	if (fabric && fabric->remove_codec)
		fabric->remove_codec(codec);
	codec->fabric = NULL;
	module_put(codec->owner);
}
EXPORT_SYMBOL_GPL(aoa_codec_unregister);

int aoa_fabric_register(struct aoa_fabric *new_fabric, struct device *dev)
{
	struct aoa_codec *c;
	int err;

	/* allow querying for presence of fabric
	 * (i.e. do this test first!) */
	if (new_fabric == fabric) {
		err = -EALREADY;
		goto attach;
	}
	if (fabric)
		return -EEXIST;
	if (!new_fabric)
		return -EINVAL;

	err = aoa_alsa_init(new_fabric->name, new_fabric->owner, dev);
	if (err)
		return err;

	fabric = new_fabric;

 attach:
	list_for_each_entry(c, &codec_list, list) {
		if (c->fabric != fabric)
			attach_codec_to_fabric(c);
	}
	return err;
}
EXPORT_SYMBOL_GPL(aoa_fabric_register);

void aoa_fabric_unregister(struct aoa_fabric *old_fabric)
{
	struct aoa_codec *c;

	if (fabric != old_fabric)
		return;

	list_for_each_entry(c, &codec_list, list) {
		if (c->fabric)
			aoa_fabric_unlink_codec(c);
	}

	aoa_alsa_cleanup();

	fabric = NULL;
}
EXPORT_SYMBOL_GPL(aoa_fabric_unregister);

void aoa_fabric_unlink_codec(struct aoa_codec *codec)
{
	if (!codec->fabric) {
		printk(KERN_ERR "snd-aoa: fabric unassigned "
				"in aoa_fabric_unlink_codec\n");
		dump_stack();
		return;
	}
	if (codec->exit)
		codec->exit(codec);
	if (codec->fabric->remove_codec)
		codec->fabric->remove_codec(codec);
	codec->fabric = NULL;
	module_put(codec->owner);
}
EXPORT_SYMBOL_GPL(aoa_fabric_unlink_codec);

static int __init aoa_init(void)
{
	return 0;
}

static void __exit aoa_exit(void)
{
	aoa_alsa_cleanup();
}

module_init(aoa_init);
module_exit(aoa_exit);
od='get'><input type='hidden' name='id' value='6e978b22efa1db9f6e71b24440b5f1d93e968ee3'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Srinivas Pandruvada &lt;srinivas.pandruvada@linux.intel.com&gt;</td><td class='right'>2017-02-03 14:18:39 -0800</td></tr>
<tr><th>committer</th><td>Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;</td><td class='right'>2017-02-04 00:11:08 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/pci/ctxfi/cthardware.c?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>6e978b22efa1db9f6e71b24440b5f1d93e968ee3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/pci/ctxfi/cthardware.c?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>c666f7a26b860674848949e39a610222b0723f89</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/pci/ctxfi/cthardware.c?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>sound/pci/ctxfi/cthardware.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/pci/ctxfi/cthardware.c?id=3c223c19aea85d3dda1416c187915f4a30b04b1f'>3c223c19aea85d3dda1416c187915f4a30b04b1f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/pci/ctxfi/cthardware.c?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3&amp;id2=3c223c19aea85d3dda1416c187915f4a30b04b1f'>diff</a>)</td></tr></table>
<div class='commit-subject'>cpufreq: intel_pstate: Disable energy efficiency optimization</div><div class='commit-msg'>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 &lt;srinivas.pandruvada@linux.intel.com&gt;
Reviewed-by: Len Brown &lt;len.brown@intel.com&gt;
Cc: 4.6+ &lt;stable@vger.kernel.org&gt; # 4.6+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>Diffstat</a> (limited to 'sound/pci/ctxfi/cthardware.c')</div><table summary='diffstat' class='diffstat'>