/*
 *  PCM DRM helpers
 *
 *   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.
 */
#include <linux/export.h>
#include <drm/drm_edid.h>
#include <sound/pcm.h>
#include <sound/pcm_drm_eld.h>

static const unsigned int eld_rates[] = {
	32000,
	44100,
	48000,
	88200,
	96000,
	176400,
	192000,
};

static unsigned int sad_max_channels(const u8 *sad)
{
	return 1 + (sad[0] & 7);
}

static int eld_limit_rates(struct snd_pcm_hw_params *params,
			   struct snd_pcm_hw_rule *rule)
{
	struct snd_interval *r = hw_param_interval(params, rule->var);
	struct snd_interval *c;
	unsigned int rate_mask = 7, i;
	const u8 *sad, *eld = rule->private;

	sad = drm_eld_sad(eld);
	if (sad) {
		c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);

		for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3) {
			unsigned max_channels = sad_max_channels(sad);

			/*
			 * Exclude SADs which do not include the
			 * requested number of channels.
			 */
			if (c->min <= max_channels)
				rate_mask |= sad[1];
		}
	}

	return snd_interval_list(r, ARRAY_SIZE(eld_rates), eld_rates,
				 rate_mask);
}

static int eld_limit_channels(struct snd_pcm_hw_params *params,
			      struct snd_pcm_hw_rule *rule)
{
	struct snd_interval *c = hw_param_interval(params, rule->var);
	struct snd_interval *r;
	struct snd_interval t = { .min = 1, .max = 2, .integer = 1, };
	unsigned int i;
	const u8 *sad, *eld = rule->private;

	sad = drm_eld_sad(eld);
	if (sad) {
		unsigned int rate_mask = 0;

		/* Convert the rate interval to a mask */
		r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
		for (i = 0; i < ARRAY_SIZE(eld_rates); i++)
			if (r->min <= eld_rates[i] && r->max >= eld_rates[i])
				rate_mask |= BIT(i);

		for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3)
			if (rate_mask & sad[1])
				t.max = max(t.max, sad_max_channels(sad));
	}

	return snd_interval_refine(c, &t);
}

int snd_pcm_hw_constraint_eld(struct snd_pcm_runtime *runtime, void *eld)
{
	int ret;

	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				  eld_limit_rates, eld,
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (ret < 0)
		return ret;

	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				  eld_limit_channels, eld,
				  SNDRV_PCM_HW_PARAM_RATE, -1);

	return ret;
}
EXPORT_SYMBOL_GPL(snd_pcm_hw_constraint_eld);
on value='range'>range</option>
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<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
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</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=88a7503376f4f3bf303c809d1a389739e1205614'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=88a7503376f4f3bf303c809d1a389739e1205614'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/switchdev?id=88a7503376f4f3bf303c809d1a389739e1205614'>switchdev</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/switchdev/Kconfig?id=88a7503376f4f3bf303c809d1a389739e1205614'>Kconfig</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='88a7503376f4f3bf303c809d1a389739e1205614'/><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>Keith Busch &lt;keith.busch@intel.com&gt;</td><td class='right'>2017-01-18 17:21:15 -0500</td></tr>
<tr><th>committer</th><td>Jens Axboe &lt;axboe@fb.com&gt;</td><td class='right'>2017-01-18 15:14:15 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/switchdev/Kconfig?id=88a7503376f4f3bf303c809d1a389739e1205614'>88a7503376f4f3bf303c809d1a389739e1205614</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/switchdev/Kconfig?id=88a7503376f4f3bf303c809d1a389739e1205614'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=88a7503376f4f3bf303c809d1a389739e1205614'>5004e4c61099074e7832ec38e88d258275c152f2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/switchdev/Kconfig?id=88a7503376f4f3bf303c809d1a389739e1205614'>net/switchdev/Kconfig</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/switchdev/Kconfig?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>fa19a769f82fb9a5ca000b83cacd13fcaeda51ac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/switchdev/Kconfig?id=88a7503376f4f3bf303c809d1a389739e1205614&amp;id2=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>diff</a>)</td></tr></table>
<div class='commit-subject'>blk-mq: Remove unused variable</div><div class='commit-msg'>Signed-off-by: Keith Busch &lt;keith.busch@intel.com&gt;
Reviewed-by: Christoph Hellwig &lt;hch@lst.de&gt;
Reviewed-by: Sagi Grimberg &lt;sagi@grimberg.me&gt;
Signed-off-by: Jens Axboe &lt;axboe@fb.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=88a7503376f4f3bf303c809d1a389739e1205614'>Diffstat</a> (limited to 'net/switchdev/Kconfig')</div><table summary='diffstat' class='diffstat'>