Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Russell King | 457 | 61.01% | 1 | 20.00% |
Matthias Reichl | 283 | 37.78% | 1 | 20.00% |
Takashi Sakamoto | 4 | 0.53% | 1 | 20.00% |
Jani Nikula | 3 | 0.40% | 1 | 20.00% |
Thomas Gleixner | 2 | 0.27% | 1 | 20.00% |
Total | 749 | 5 |
// SPDX-License-Identifier: GPL-2.0-only /* * PCM DRM helpers */ #include <linux/bitfield.h> #include <linux/export.h> #include <linux/hdmi.h> #include <drm/drm_edid.h> #include <drm/drm_eld.h> #include <sound/pcm.h> #include <sound/pcm_drm_eld.h> #define SAD0_CHANNELS_MASK GENMASK(2, 0) /* max number of channels - 1 */ #define SAD0_FORMAT_MASK GENMASK(6, 3) /* audio format */ #define SAD1_RATE_MASK GENMASK(6, 0) /* bitfield of supported rates */ #define SAD1_RATE_32000_MASK BIT(0) #define SAD1_RATE_44100_MASK BIT(1) #define SAD1_RATE_48000_MASK BIT(2) #define SAD1_RATE_88200_MASK BIT(3) #define SAD1_RATE_96000_MASK BIT(4) #define SAD1_RATE_176400_MASK BIT(5) #define SAD1_RATE_192000_MASK BIT(6) static const unsigned int eld_rates[] = { 32000, 44100, 48000, 88200, 96000, 176400, 192000, }; static unsigned int map_rate_families(const u8 *sad, unsigned int mask_32000, unsigned int mask_44100, unsigned int mask_48000) { unsigned int rate_mask = 0; if (sad[1] & SAD1_RATE_32000_MASK) rate_mask |= mask_32000; if (sad[1] & (SAD1_RATE_44100_MASK | SAD1_RATE_88200_MASK | SAD1_RATE_176400_MASK)) rate_mask |= mask_44100; if (sad[1] & (SAD1_RATE_48000_MASK | SAD1_RATE_96000_MASK | SAD1_RATE_192000_MASK)) rate_mask |= mask_48000; return rate_mask; } static unsigned int sad_rate_mask(const u8 *sad) { switch (FIELD_GET(SAD0_FORMAT_MASK, sad[0])) { case HDMI_AUDIO_CODING_TYPE_PCM: return sad[1] & SAD1_RATE_MASK; case HDMI_AUDIO_CODING_TYPE_AC3: case HDMI_AUDIO_CODING_TYPE_DTS: return map_rate_families(sad, SAD1_RATE_32000_MASK, SAD1_RATE_44100_MASK, SAD1_RATE_48000_MASK); case HDMI_AUDIO_CODING_TYPE_EAC3: case HDMI_AUDIO_CODING_TYPE_DTS_HD: case HDMI_AUDIO_CODING_TYPE_MLP: return map_rate_families(sad, 0, SAD1_RATE_176400_MASK, SAD1_RATE_192000_MASK); default: /* TODO adjust for other compressed formats as well */ return sad[1] & SAD1_RATE_MASK; } } static unsigned int sad_max_channels(const u8 *sad) { switch (FIELD_GET(SAD0_FORMAT_MASK, sad[0])) { case HDMI_AUDIO_CODING_TYPE_PCM: return 1 + FIELD_GET(SAD0_CHANNELS_MASK, sad[0]); case HDMI_AUDIO_CODING_TYPE_AC3: case HDMI_AUDIO_CODING_TYPE_DTS: case HDMI_AUDIO_CODING_TYPE_EAC3: return 2; case HDMI_AUDIO_CODING_TYPE_DTS_HD: case HDMI_AUDIO_CODING_TYPE_MLP: return 8; default: /* TODO adjust for other compressed formats as well */ return 1 + FIELD_GET(SAD0_CHANNELS_MASK, sad[0]); } } 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); const 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_c(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_rate_mask(sad); } } 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); const 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_c(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_rate_mask(sad)) 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);
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