/* * 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 #include #include #include 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); >author
path: root/sound/soc/codecs/wm9081.c
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authorAlexander Stein <alexander.stein@systec-electronic.com>2017-01-30 12:35:28 +0100
committerLinus Walleij <linus.walleij@linaro.org>2017-01-30 15:53:57 +0100
commitcdca06e4e85974d8a3503ab15709dbbaf90d3dd1 (patch)
tree268b0c01070a957006db97c88dccb5fb061440ff /sound/soc/codecs/wm9081.c
parent1b89970d81bbd52720fc64a3fe9572ee33588363 (diff)
pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler
According to VLI64 Intel Atom E3800 Specification Update (#329901) concurrent read accesses may result in returning 0xffffffff and write accesses may be dropped silently. To workaround all accesses must be protected by locks. Cc: stable@vger.kernel.org Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'sound/soc/codecs/wm9081.c')