Merge series "Add HDMI support for Intel KeemBay I2S" from Sia Jee Heng <jee.heng.sia@intel.com>:

The below patch series are to support Audio over HDMI.
The modification in this patch series shall allow I2S driver
to playback standard PCM format and IEC958 encoded format to
the ADV7511 HDMI chip.

ALSA IEC958 plugin will be used to compose the IEC958 format.

Existing hdmi-codec driver only support standard pcm format.
Support of IEC958 encoded format passdown from ALSA IEC958 plugin
is needed so that the IEC958 encoded data can be streamed to the
HDMI chip.

Sia Jee Heng (4):
  ASoC: codec: hdmi-codec: Support IEC958 encoded PCM format
  drm: bridge: adv7511: Support I2S IEC958 encoded PCM format
  dt-bindings: sound: Intel, Keembay-i2s: Add hdmi-i2s compatible string
  ASoC: Intel: KMB: Support IEC958 encoded PCM format

 .../bindings/sound/intel,keembay-i2s.yaml     |  1 +
 drivers/gpu/drm/bridge/adv7511/adv7511.h      |  1 +
 .../gpu/drm/bridge/adv7511/adv7511_audio.c    |  6 ++
 include/sound/hdmi-codec.h                    |  5 ++
 sound/soc/codecs/hdmi-codec.c                 |  4 +-
 sound/soc/intel/keembay/kmb_platform.c        | 73 ++++++++++++++++++-
 sound/soc/intel/keembay/kmb_platform.h        |  1 +
 7 files changed, 89 insertions(+), 2 deletions(-)

base-commit: 2557c711b87cd42bb22be9ca6ff3fce038624f30
--
2.18.0

Documentation/devicetree/bindings/sound/intel,keembay-i2s.yaml

@@ -18,6 +18,7 @@ properties:
     enum:
       - intel,keembay-i2s
       - intel,keembay-tdm
+      - intel,keembay-hdmi-i2s
 
   "#sound-dai-cells":
     const: 0

include/sound/hdmi-codec.h

@@ -34,6 +34,11 @@ struct hdmi_codec_daifmt {
 	unsigned int frame_clk_inv:1;
 	unsigned int bit_clk_master:1;
 	unsigned int frame_clk_master:1;
+	/* bit_fmt could be standard PCM format or
+	 * IEC958 encoded format. ALSA IEC958 plugin will pass
+	 * IEC958_SUBFRAME format to the underneath driver.
+	 */
+	snd_pcm_format_t bit_fmt;
 };
 
 /*

sound/soc/codecs/hdmi-codec.c

@@ -489,6 +489,7 @@ static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
 	hp.sample_rate = params_rate(params);
 	hp.channels = params_channels(params);
 
+	cf->bit_fmt = params_format(params);
 	return hcp->hcd.ops->hw_params(dai->dev->parent, hcp->hcd.data,
 				       cf, &hp);
 }
@@ -617,7 +618,8 @@ static const struct snd_soc_dai_ops hdmi_codec_spdif_dai_ops = {
 			 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
 			 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
 			 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |\
-			 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE)
+			 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |\
+			 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
 
 static int hdmi_codec_pcm_new(struct snd_soc_pcm_runtime *rtd,
 			      struct snd_soc_dai *dai)

sound/soc/intel/keembay/kmb_platform.c

@@ -5,6 +5,7 @@
 // Intel KeemBay Platform driver.
 //
 
+#include <linux/bitrev.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
@@ -39,7 +40,8 @@ static const struct snd_pcm_hardware kmb_pcm_hardware = {
 	.rate_max = 48000,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE |
 		   SNDRV_PCM_FMTBIT_S24_LE |
-		   SNDRV_PCM_FMTBIT_S32_LE,
+		   SNDRV_PCM_FMTBIT_S32_LE |
+		   SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
 	.channels_min = 2,
 	.channels_max = 2,
 	.buffer_bytes_max = BUFFER_BYTES_MAX,
@@ -50,6 +52,50 @@ static const struct snd_pcm_hardware kmb_pcm_hardware = {
 	.fifo_size = 16,
 };
 
+/*
+ * Convert to ADV7511 HDMI hardware format.
+ * ADV7511 HDMI chip need parity bit replaced by block start bit and
+ * with the preamble bits left out.
+ * ALSA IEC958 subframe format:
+ * bit 0-3  = preamble (0x8 = block start)
+ *     4-7  = AUX (=0)
+ *     8-27 = audio data (without AUX if 24bit sample)
+ *     28   = validity
+ *     29   = user data
+ *     30   = channel status
+ *     31   = parity
+ *
+ * ADV7511 IEC958 subframe format:
+ * bit 0-23  = audio data
+ *     24    = validity
+ *     25    = user data
+ *     26    = channel status
+ *     27    = block start
+ *     28-31 = 0
+ * MSB to LSB bit reverse by software as hardware not supporting it.
+ */
+static void hdmi_reformat_iec958(struct snd_pcm_runtime *runtime,
+				 struct kmb_i2s_info *kmb_i2s,
+				 unsigned int tx_ptr)
+{
+	u32(*buf)[2] = (void *)runtime->dma_area;
+	unsigned long temp;
+	u32 i, j, sample;
+
+	for (i = 0; i < kmb_i2s->fifo_th; i++) {
+		j = 0;
+		do {
+			temp = buf[tx_ptr][j];
+			/* Replace parity with block start*/
+			assign_bit(31, &temp, (BIT(3) & temp));
+			sample = bitrev32(temp);
+			buf[tx_ptr][j] = sample << 4;
+			j++;
+		} while (j < 2);
+		tx_ptr++;
+	}
+}
+
 static unsigned int kmb_pcm_tx_fn(struct kmb_i2s_info *kmb_i2s,
 				  struct snd_pcm_runtime *runtime,
 				  unsigned int tx_ptr, bool *period_elapsed)
@@ -65,6 +111,8 @@ static unsigned int kmb_pcm_tx_fn(struct kmb_i2s_info *kmb_i2s,
 			writel(((u16(*)[2])buf)[tx_ptr][0], i2s_base + LRBR_LTHR(0));
 			writel(((u16(*)[2])buf)[tx_ptr][1], i2s_base + RRBR_RTHR(0));
 		} else {
+			if (kmb_i2s->iec958_fmt)
+				hdmi_reformat_iec958(runtime, kmb_i2s, tx_ptr);
 			writel(((u32(*)[2])buf)[tx_ptr][0], i2s_base + LRBR_LTHR(0));
 			writel(((u32(*)[2])buf)[tx_ptr][1], i2s_base + RRBR_RTHR(0));
 		}
@@ -235,6 +283,7 @@ static int kmb_pcm_trigger(struct snd_soc_component *component,
 			kmb_i2s->tx_substream = NULL;
 		else
 			kmb_i2s->rx_substream = NULL;
+		kmb_i2s->iec958_fmt = false;
 		break;
 	default:
 		return -EINVAL;
@@ -549,6 +598,9 @@ static int kmb_dai_hw_params(struct snd_pcm_substream *substream,
 		kmb_i2s->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 		kmb_i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 		break;
+	case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
+		kmb_i2s->iec958_fmt = true;
+		fallthrough;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		config->data_width = 32;
 		kmb_i2s->ccr = 0x10;
@@ -686,6 +738,24 @@ static struct snd_soc_dai_ops kmb_dai_ops = {
 	.set_fmt	= kmb_set_dai_fmt,
 };
 
+static struct snd_soc_dai_driver intel_kmb_hdmi_dai[] = {
+	{
+		.name = "intel_kmb_hdmi_i2s",
+		.playback = {
+			.channels_min = 2,
+			.channels_max = 2,
+			.rates = SNDRV_PCM_RATE_48000,
+			.rate_min = 48000,
+			.rate_max = 48000,
+			.formats = (SNDRV_PCM_FMTBIT_S16_LE |
+				    SNDRV_PCM_FMTBIT_S24_LE |
+				    SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE),
+		},
+		.ops = &kmb_dai_ops,
+		.probe = kmb_probe,
+	},
+};
+
 static struct snd_soc_dai_driver intel_kmb_i2s_dai[] = {
 	{
 		.name = "intel_kmb_i2s",
@@ -740,6 +810,7 @@ static struct snd_soc_dai_driver intel_kmb_tdm_dai[] = {
 
 static const struct of_device_id kmb_plat_of_match[] = {
 	{ .compatible = "intel,keembay-i2s", .data = &intel_kmb_i2s_dai},
+	{ .compatible = "intel,keembay-hdmi-i2s", .data = &intel_kmb_hdmi_dai},
 	{ .compatible = "intel,keembay-tdm", .data = &intel_kmb_tdm_dai},
 	{}
 };

sound/soc/intel/keembay/kmb_platform.h

@@ -150,6 +150,7 @@ struct kmb_i2s_info {
 	struct snd_pcm_substream *rx_substream;
 	unsigned int tx_ptr;
 	unsigned int rx_ptr;
+	bool iec958_fmt;
 };
 
 #endif /* KMB_PLATFORM_H_ */