Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 163 insertions, 0 deletions

diff --git a/sound/core/pcm_drm_eld.c b/sound/core/pcm_drm_eld.c
new file mode 100644
index 000000000..070750719
--- /dev/null
+++ b/sound/core/pcm_drm_eld.c
@@ -0,0 +1,163 @@
+// 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 <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);