Merge branch 'drm-dwhdmi-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next

This series:
* adds support for interlaced video modes to the ipu-v3 driver
  and dw_hdmi bridge.
* reworks the dw_hdmi connector enable/disable support, to ensure that
  when DRM disables the output, it stays disabled irrespective of the
  hotplug state.
* adds support for connector forcing, so we can force the hotplug state
  for this connector.
* adds the ALSA AHB audio driver to the bridge: Iwai has acked the
  audio driver.
* a few fixes to the ACR calculations to allow more modes to work with
  audio on iMX6.

Fabio has independently tested this series, so all patches here carry
his tested-by tag.

* 'drm-dwhdmi-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  drm: bridge/dw_hdmi: replace CTS calculation for the ACR
  drm: bridge/dw_hdmi: remove ratio support from ACR code
  drm: bridge/dw_hdmi: adjust pixel clock values in N calculation
  drm: bridge/dw_hdmi: avoid being recursive in N calculation
  drm: bridge/dw_hdmi-ahb-audio: allow larger buffer sizes
  drm: bridge/dw_hdmi-ahb-audio: basic support for multi-channel PCM audio
  drm: bridge/dw_hdmi-ahb-audio: parse ELD from HDMI driver
  drm: bridge/dw_hdmi-ahb-audio: add audio driver
  drm: bridge/dw_hdmi: improve HDMI enable/disable handling
  drm: bridge/dw_hdmi: add connector mode forcing
  drm: bridge/dw_hdmi: add support for interlaced video modes
  gpu: imx: fix support for interlaced modes
  gpu: imx: simplify sync polarity setting

drivers/gpu/drm/bridge/Kconfig

@@ -11,6 +11,18 @@ config DRM_DW_HDMI
 	tristate
 	select DRM_KMS_HELPER
 
+config DRM_DW_HDMI_AHB_AUDIO
+	tristate "Synopsis Designware AHB Audio interface"
+	depends on DRM_DW_HDMI && SND
+	select SND_PCM
+	select SND_PCM_ELD
+	select SND_PCM_IEC958
+	help
+	  Support the AHB Audio interface which is part of the Synopsis
+	  Designware HDMI block.  This is used in conjunction with
+	  the i.MX6 HDMI driver.
+
+
 config DRM_NXP_PTN3460
 	tristate "NXP PTN3460 DP/LVDS bridge"
 	depends on OF

drivers/gpu/drm/bridge/Makefile

 ccflags-y := -Iinclude/drm
 
 obj-$(CONFIG_DRM_DW_HDMI) += dw_hdmi.o
+obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw_hdmi-ahb-audio.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
 obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o

drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.c

+/*
+ * DesignWare HDMI audio driver
+ *
+ * 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.
+ *
+ * Written and tested against the Designware HDMI Tx found in iMX6.
+ */
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <drm/bridge/dw_hdmi.h>
+#include <drm/drm_edid.h>
+
+#include <sound/asoundef.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_drm_eld.h>
+#include <sound/pcm_iec958.h>
+
+#include "dw_hdmi-audio.h"
+
+#define DRIVER_NAME "dw-hdmi-ahb-audio"
+
+/* Provide some bits rather than bit offsets */
+enum {
+	HDMI_AHB_DMA_CONF0_SW_FIFO_RST = BIT(7),
+	HDMI_AHB_DMA_CONF0_EN_HLOCK = BIT(3),
+	HDMI_AHB_DMA_START_START = BIT(0),
+	HDMI_AHB_DMA_STOP_STOP = BIT(0),
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0_ERROR = BIT(5),
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0_LOST = BIT(4),
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0_RETRY = BIT(3),
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0_DONE = BIT(2),
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFFULL = BIT(1),
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFEMPTY = BIT(0),
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL =
+		HDMI_IH_MUTE_AHBDMAAUD_STAT0_ERROR |
+		HDMI_IH_MUTE_AHBDMAAUD_STAT0_LOST |
+		HDMI_IH_MUTE_AHBDMAAUD_STAT0_RETRY |
+		HDMI_IH_MUTE_AHBDMAAUD_STAT0_DONE |
+		HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFFULL |
+		HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFEMPTY,
+	HDMI_IH_AHBDMAAUD_STAT0_ERROR = BIT(5),
+	HDMI_IH_AHBDMAAUD_STAT0_LOST = BIT(4),
+	HDMI_IH_AHBDMAAUD_STAT0_RETRY = BIT(3),
+	HDMI_IH_AHBDMAAUD_STAT0_DONE = BIT(2),
+	HDMI_IH_AHBDMAAUD_STAT0_BUFFFULL = BIT(1),
+	HDMI_IH_AHBDMAAUD_STAT0_BUFFEMPTY = BIT(0),
+	HDMI_IH_AHBDMAAUD_STAT0_ALL =
+		HDMI_IH_AHBDMAAUD_STAT0_ERROR |
+		HDMI_IH_AHBDMAAUD_STAT0_LOST |
+		HDMI_IH_AHBDMAAUD_STAT0_RETRY |
+		HDMI_IH_AHBDMAAUD_STAT0_DONE |
+		HDMI_IH_AHBDMAAUD_STAT0_BUFFFULL |
+		HDMI_IH_AHBDMAAUD_STAT0_BUFFEMPTY,
+	HDMI_AHB_DMA_CONF0_INCR16 = 2 << 1,
+	HDMI_AHB_DMA_CONF0_INCR8 = 1 << 1,
+	HDMI_AHB_DMA_CONF0_INCR4 = 0,
+	HDMI_AHB_DMA_CONF0_BURST_MODE = BIT(0),
+	HDMI_AHB_DMA_MASK_DONE = BIT(7),
+
+	HDMI_REVISION_ID = 0x0001,
+	HDMI_IH_AHBDMAAUD_STAT0 = 0x0109,
+	HDMI_IH_MUTE_AHBDMAAUD_STAT0 = 0x0189,
+	HDMI_FC_AUDICONF2 = 0x1027,
+	HDMI_FC_AUDSCONF = 0x1063,
+	HDMI_FC_AUDSCONF_LAYOUT1 = 1 << 0,
+	HDMI_FC_AUDSCONF_LAYOUT0 = 0 << 0,
+	HDMI_AHB_DMA_CONF0 = 0x3600,
+	HDMI_AHB_DMA_START = 0x3601,
+	HDMI_AHB_DMA_STOP = 0x3602,
+	HDMI_AHB_DMA_THRSLD = 0x3603,
+	HDMI_AHB_DMA_STRADDR0 = 0x3604,
+	HDMI_AHB_DMA_STPADDR0 = 0x3608,
+	HDMI_AHB_DMA_MASK = 0x3614,
+	HDMI_AHB_DMA_POL = 0x3615,
+	HDMI_AHB_DMA_CONF1 = 0x3616,
+	HDMI_AHB_DMA_BUFFPOL = 0x361a,
+};
+
+struct dw_hdmi_channel_conf {
+	u8 conf1;
+	u8 ca;
+};
+
+/*
+ * The default mapping of ALSA channels to HDMI channels and speaker
+ * allocation bits.  Note that we can't do channel remapping here -
+ * channels must be in the same order.
+ *
+ * Mappings for alsa-lib pcm/surround*.conf files:
+ *
+ *		Front	Sur4.0	Sur4.1	Sur5.0	Sur5.1	Sur7.1
+ * Channels	2	4	6	6	6	8
+ *
+ * Our mapping from ALSA channel to CEA686D speaker name and HDMI channel:
+ *
+ *				Number of ALSA channels
+ * ALSA Channel	2	3	4	5	6	7	8
+ * 0		FL:0	=	=	=	=	=	=
+ * 1		FR:1	=	=	=	=	=	=
+ * 2			FC:3	RL:4	LFE:2	=	=	=
+ * 3				RR:5	RL:4	FC:3	=	=
+ * 4					RR:5	RL:4	=	=
+ * 5						RR:5	=	=
+ * 6							RC:6	=
+ * 7							RLC/FRC	RLC/FRC
+ */
+static struct dw_hdmi_channel_conf default_hdmi_channel_config[7] = {
+	{ 0x03, 0x00 },	/* FL,FR */
+	{ 0x0b, 0x02 },	/* FL,FR,FC */
+	{ 0x33, 0x08 },	/* FL,FR,RL,RR */
+	{ 0x37, 0x09 },	/* FL,FR,LFE,RL,RR */
+	{ 0x3f, 0x0b },	/* FL,FR,LFE,FC,RL,RR */
+	{ 0x7f, 0x0f },	/* FL,FR,LFE,FC,RL,RR,RC */
+	{ 0xff, 0x13 },	/* FL,FR,LFE,FC,RL,RR,[FR]RC,[FR]LC */
+};
+
+struct snd_dw_hdmi {
+	struct snd_card *card;
+	struct snd_pcm *pcm;
+	spinlock_t lock;
+	struct dw_hdmi_audio_data data;
+	struct snd_pcm_substream *substream;
+	void (*reformat)(struct snd_dw_hdmi *, size_t, size_t);
+	void *buf_src;
+	void *buf_dst;
+	dma_addr_t buf_addr;
+	unsigned buf_offset;
+	unsigned buf_period;
+	unsigned buf_size;
+	unsigned channels;
+	u8 revision;
+	u8 iec_offset;
+	u8 cs[192][8];
+};
+
+static void dw_hdmi_writel(u32 val, void __iomem *ptr)
+{
+	writeb_relaxed(val, ptr);
+	writeb_relaxed(val >> 8, ptr + 1);
+	writeb_relaxed(val >> 16, ptr + 2);
+	writeb_relaxed(val >> 24, ptr + 3);
+}
+
+/*
+ * Convert to hardware format: The userspace buffer contains IEC958 samples,
+ * with the PCUV bits in bits 31..28 and audio samples in bits 27..4.  We
+ * need these to be in bits 27..24, with the IEC B bit in bit 28, and audio
+ * samples in 23..0.
+ *
+ * Default preamble in bits 3..0: 8 = block start, 4 = even 2 = odd
+ *
+ * Ideally, we could do with having the data properly formatted in userspace.
+ */
+static void dw_hdmi_reformat_iec958(struct snd_dw_hdmi *dw,
+	size_t offset, size_t bytes)
+{
+	u32 *src = dw->buf_src + offset;
+	u32 *dst = dw->buf_dst + offset;
+	u32 *end = dw->buf_src + offset + bytes;
+
+	do {
+		u32 b, sample = *src++;
+
+		b = (sample & 8) << (28 - 3);
+
+		sample >>= 4;
+
+		*dst++ = sample | b;
+	} while (src < end);
+}
+
+static u32 parity(u32 sample)
+{
+	sample ^= sample >> 16;
+	sample ^= sample >> 8;
+	sample ^= sample >> 4;
+	sample ^= sample >> 2;
+	sample ^= sample >> 1;
+	return (sample & 1) << 27;
+}
+
+static void dw_hdmi_reformat_s24(struct snd_dw_hdmi *dw,
+	size_t offset, size_t bytes)
+{
+	u32 *src = dw->buf_src + offset;
+	u32 *dst = dw->buf_dst + offset;
+	u32 *end = dw->buf_src + offset + bytes;
+
+	do {
+		unsigned i;
+		u8 *cs;
+
+		cs = dw->cs[dw->iec_offset++];
+		if (dw->iec_offset >= 192)
+			dw->iec_offset = 0;
+
+		i = dw->channels;
+		do {
+			u32 sample = *src++;
+
+			sample &= ~0xff000000;
+			sample |= *cs++ << 24;
+			sample |= parity(sample & ~0xf8000000);
+
+			*dst++ = sample;
+		} while (--i);
+	} while (src < end);
+}
+
+static void dw_hdmi_create_cs(struct snd_dw_hdmi *dw,
+	struct snd_pcm_runtime *runtime)
+{
+	u8 cs[4];
+	unsigned ch, i, j;
+
+	snd_pcm_create_iec958_consumer(runtime, cs, sizeof(cs));
+
+	memset(dw->cs, 0, sizeof(dw->cs));
+
+	for (ch = 0; ch < 8; ch++) {
+		cs[2] &= ~IEC958_AES2_CON_CHANNEL;
+		cs[2] |= (ch + 1) << 4;
+
+		for (i = 0; i < ARRAY_SIZE(cs); i++) {
+			unsigned c = cs[i];
+
+			for (j = 0; j < 8; j++, c >>= 1)
+				dw->cs[i * 8 + j][ch] = (c & 1) << 2;
+		}
+	}
+	dw->cs[0][0] |= BIT(4);
+}
+
+static void dw_hdmi_start_dma(struct snd_dw_hdmi *dw)
+{
+	void __iomem *base = dw->data.base;
+	unsigned offset = dw->buf_offset;
+	unsigned period = dw->buf_period;
+	u32 start, stop;
+
+	dw->reformat(dw, offset, period);
+
+	/* Clear all irqs before enabling irqs and starting DMA */
+	writeb_relaxed(HDMI_IH_AHBDMAAUD_STAT0_ALL,
+		       base + HDMI_IH_AHBDMAAUD_STAT0);
+
+	start = dw->buf_addr + offset;
+	stop = start + period - 1;
+
+	/* Setup the hardware start/stop addresses */
+	dw_hdmi_writel(start, base + HDMI_AHB_DMA_STRADDR0);
+	dw_hdmi_writel(stop, base + HDMI_AHB_DMA_STPADDR0);
+
+	writeb_relaxed((u8)~HDMI_AHB_DMA_MASK_DONE, base + HDMI_AHB_DMA_MASK);
+	writeb(HDMI_AHB_DMA_START_START, base + HDMI_AHB_DMA_START);
+
+	offset += period;
+	if (offset >= dw->buf_size)
+		offset = 0;
+	dw->buf_offset = offset;
+}
+
+static void dw_hdmi_stop_dma(struct snd_dw_hdmi *dw)
+{
+	/* Disable interrupts before disabling DMA */
+	writeb_relaxed(~0, dw->data.base + HDMI_AHB_DMA_MASK);
+	writeb_relaxed(HDMI_AHB_DMA_STOP_STOP, dw->data.base + HDMI_AHB_DMA_STOP);
+}
+
+static irqreturn_t snd_dw_hdmi_irq(int irq, void *data)
+{
+	struct snd_dw_hdmi *dw = data;
+	struct snd_pcm_substream *substream;
+	unsigned stat;
+
+	stat = readb_relaxed(dw->data.base + HDMI_IH_AHBDMAAUD_STAT0);
+	if (!stat)
+		return IRQ_NONE;
+
+	writeb_relaxed(stat, dw->data.base + HDMI_IH_AHBDMAAUD_STAT0);
+
+	substream = dw->substream;
+	if (stat & HDMI_IH_AHBDMAAUD_STAT0_DONE && substream) {
+		snd_pcm_period_elapsed(substream);
+
+		spin_lock(&dw->lock);
+		if (dw->substream)
+			dw_hdmi_start_dma(dw);
+		spin_unlock(&dw->lock);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static struct snd_pcm_hardware dw_hdmi_hw = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID,
+	.formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE |
+		   SNDRV_PCM_FMTBIT_S24_LE,
+	.rates = SNDRV_PCM_RATE_32000 |
+		 SNDRV_PCM_RATE_44100 |
+		 SNDRV_PCM_RATE_48000 |
+		 SNDRV_PCM_RATE_88200 |
+		 SNDRV_PCM_RATE_96000 |
+		 SNDRV_PCM_RATE_176400 |
+		 SNDRV_PCM_RATE_192000,
+	.channels_min = 2,
+	.channels_max = 8,
+	.buffer_bytes_max = 1024 * 1024,
+	.period_bytes_min = 256,
+	.period_bytes_max = 8192,	/* ERR004323: must limit to 8k */
+	.periods_min = 2,
+	.periods_max = 16,
+	.fifo_size = 0,
+};
+
+static int dw_hdmi_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_dw_hdmi *dw = substream->private_data;
+	void __iomem *base = dw->data.base;
+	int ret;
+
+	runtime->hw = dw_hdmi_hw;
+
+	ret = snd_pcm_hw_constraint_eld(runtime, dw->data.eld);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_pcm_limit_hw_rates(runtime);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_pcm_hw_constraint_integer(runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		return ret;
+
+	/* Limit the buffer size to the size of the preallocated buffer */
+	ret = snd_pcm_hw_constraint_minmax(runtime,
+					   SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					   0, substream->dma_buffer.bytes);
+	if (ret < 0)
+		return ret;
+
+	/* Clear FIFO */
+	writeb_relaxed(HDMI_AHB_DMA_CONF0_SW_FIFO_RST,
+		       base + HDMI_AHB_DMA_CONF0);
+
+	/* Configure interrupt polarities */
+	writeb_relaxed(~0, base + HDMI_AHB_DMA_POL);
+	writeb_relaxed(~0, base + HDMI_AHB_DMA_BUFFPOL);
+
+	/* Keep interrupts masked, and clear any pending */
+	writeb_relaxed(~0, base + HDMI_AHB_DMA_MASK);
+	writeb_relaxed(~0, base + HDMI_IH_AHBDMAAUD_STAT0);
+
+	ret = request_irq(dw->data.irq, snd_dw_hdmi_irq, IRQF_SHARED,
+			  "dw-hdmi-audio", dw);
+	if (ret)
+		return ret;
+
+	/* Un-mute done interrupt */
+	writeb_relaxed(HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL &
+		       ~HDMI_IH_MUTE_AHBDMAAUD_STAT0_DONE,
+		       base + HDMI_IH_MUTE_AHBDMAAUD_STAT0);
+
+	return 0;
+}
+
+static int dw_hdmi_close(struct snd_pcm_substream *substream)
+{
+	struct snd_dw_hdmi *dw = substream->private_data;
+
+	/* Mute all interrupts */
+	writeb_relaxed(HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL,
+		       dw->data.base + HDMI_IH_MUTE_AHBDMAAUD_STAT0);
+
+	free_irq(dw->data.irq, dw);
+
+	return 0;
+}
+
+static int dw_hdmi_hw_free(struct snd_pcm_substream *substream)
+{
+	return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int dw_hdmi_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	/* Allocate the PCM runtime buffer, which is exposed to userspace. */
+	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+						params_buffer_bytes(params));
+}
+
+static int dw_hdmi_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_dw_hdmi *dw = substream->private_data;
+	u8 threshold, conf0, conf1, layout, ca;
+
+	/* Setup as per 3.0.5 FSL 4.1.0 BSP */
+	switch (dw->revision) {
+	case 0x0a:
+		conf0 = HDMI_AHB_DMA_CONF0_BURST_MODE |
+			HDMI_AHB_DMA_CONF0_INCR4;
+		if (runtime->channels == 2)
+			threshold = 126;
+		else
+			threshold = 124;
+		break;
+	case 0x1a:
+		conf0 = HDMI_AHB_DMA_CONF0_BURST_MODE |
+			HDMI_AHB_DMA_CONF0_INCR8;
+		threshold = 128;
+		break;
+	default:
+		/* NOTREACHED */
+		return -EINVAL;
+	}
+
+	dw_hdmi_set_sample_rate(dw->data.hdmi, runtime->rate);
+
+	/* Minimum number of bytes in the fifo. */
+	runtime->hw.fifo_size = threshold * 32;
+
+	conf0 |= HDMI_AHB_DMA_CONF0_EN_HLOCK;
+	conf1 = default_hdmi_channel_config[runtime->channels - 2].conf1;
+	ca = default_hdmi_channel_config[runtime->channels - 2].ca;
+
+	/*
+	 * For >2 channel PCM audio, we need to select layout 1
+	 * and set an appropriate channel map.
+	 */
+	if (runtime->channels > 2)
+		layout = HDMI_FC_AUDSCONF_LAYOUT1;
+	else
+		layout = HDMI_FC_AUDSCONF_LAYOUT0;
+
+	writeb_relaxed(threshold, dw->data.base + HDMI_AHB_DMA_THRSLD);
+	writeb_relaxed(conf0, dw->data.base + HDMI_AHB_DMA_CONF0);
+	writeb_relaxed(conf1, dw->data.base + HDMI_AHB_DMA_CONF1);
+	writeb_relaxed(layout, dw->data.base + HDMI_FC_AUDSCONF);
+	writeb_relaxed(ca, dw->data.base + HDMI_FC_AUDICONF2);
+
+	switch (runtime->format) {
+	case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
+		dw->reformat = dw_hdmi_reformat_iec958;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		dw_hdmi_create_cs(dw, runtime);
+		dw->reformat = dw_hdmi_reformat_s24;
+		break;
+	}
+	dw->iec_offset = 0;
+	dw->channels = runtime->channels;
+	dw->buf_src  = runtime->dma_area;
+	dw->buf_dst  = substream->dma_buffer.area;
+	dw->buf_addr = substream->dma_buffer.addr;
+	dw->buf_period = snd_pcm_lib_period_bytes(substream);
+	dw->buf_size = snd_pcm_lib_buffer_bytes(substream);
+
+	return 0;
+}
+
+static int dw_hdmi_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_dw_hdmi *dw = substream->private_data;
+	unsigned long flags;
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		spin_lock_irqsave(&dw->lock, flags);
+		dw->buf_offset = 0;
+		dw->substream = substream;
+		dw_hdmi_start_dma(dw);
+		dw_hdmi_audio_enable(dw->data.hdmi);
+		spin_unlock_irqrestore(&dw->lock, flags);
+		substream->runtime->delay = substream->runtime->period_size;
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+		spin_lock_irqsave(&dw->lock, flags);
+		dw->substream = NULL;
+		dw_hdmi_stop_dma(dw);
+		dw_hdmi_audio_disable(dw->data.hdmi);
+		spin_unlock_irqrestore(&dw->lock, flags);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static snd_pcm_uframes_t dw_hdmi_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_dw_hdmi *dw = substream->private_data;
+
+	/*
+	 * We are unable to report the exact hardware position as
+	 * reading the 32-bit DMA position using 8-bit reads is racy.
+	 */
+	return bytes_to_frames(runtime, dw->buf_offset);
+}
+
+static struct snd_pcm_ops snd_dw_hdmi_ops = {
+	.open = dw_hdmi_open,
+	.close = dw_hdmi_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = dw_hdmi_hw_params,
+	.hw_free = dw_hdmi_hw_free,
+	.prepare = dw_hdmi_prepare,
+	.trigger = dw_hdmi_trigger,
+	.pointer = dw_hdmi_pointer,
+	.page = snd_pcm_lib_get_vmalloc_page,
+};
+
+static int snd_dw_hdmi_probe(struct platform_device *pdev)
+{
+	const struct dw_hdmi_audio_data *data = pdev->dev.platform_data;
+	struct device *dev = pdev->dev.parent;
+	struct snd_dw_hdmi *dw;
+	struct snd_card *card;
+	struct snd_pcm *pcm;
+	unsigned revision;
+	int ret;
+
+	writeb_relaxed(HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL,
+		       data->base + HDMI_IH_MUTE_AHBDMAAUD_STAT0);
+	revision = readb_relaxed(data->base + HDMI_REVISION_ID);
+	if (revision != 0x0a && revision != 0x1a) {
+		dev_err(dev, "dw-hdmi-audio: unknown revision 0x%02x\n",
+			revision);
+		return -ENXIO;
+	}
+
+	ret = snd_card_new(dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+			      THIS_MODULE, sizeof(struct snd_dw_hdmi), &card);
+	if (ret < 0)
+		return ret;
+
+	strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
+	strlcpy(card->shortname, "DW-HDMI", sizeof(card->shortname));
+	snprintf(card->longname, sizeof(card->longname),
+		 "%s rev 0x%02x, irq %d", card->shortname, revision,
+		 data->irq);
+
+	dw = card->private_data;
+	dw->card = card;
+	dw->data = *data;
+	dw->revision = revision;
+
+	spin_lock_init(&dw->lock);
+
+	ret = snd_pcm_new(card, "DW HDMI", 0, 1, 0, &pcm);
+	if (ret < 0)
+		goto err;
+
+	dw->pcm = pcm;
+	pcm->private_data = dw;
+	strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_dw_hdmi_ops);
+
+	/*
+	 * To support 8-channel 96kHz audio reliably, we need 512k
+	 * to satisfy alsa with our restricted period (ERR004323).
+	 */
+	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+			dev, 128 * 1024, 1024 * 1024);
+
+	ret = snd_card_register(card);
+	if (ret < 0)
+		goto err;
+
+	platform_set_drvdata(pdev, dw);
+
+	return 0;
+
+err:
+	snd_card_free(card);
+	return ret;
+}
+
+static int snd_dw_hdmi_remove(struct platform_device *pdev)
+{
+	struct snd_dw_hdmi *dw = platform_get_drvdata(pdev);
+
+	snd_card_free(dw->card);
+
+	return 0;
+}
+
+#if defined(CONFIG_PM_SLEEP) && defined(IS_NOT_BROKEN)
+/*
+ * This code is fine, but requires implementation in the dw_hdmi_trigger()
+ * method which is currently missing as I have no way to test this.
+ */
+static int snd_dw_hdmi_suspend(struct device *dev)
+{
+	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+
+	snd_power_change_state(dw->card, SNDRV_CTL_POWER_D3cold);
+	snd_pcm_suspend_all(dw->pcm);
+
+	return 0;
+}
+
+static int snd_dw_hdmi_resume(struct device *dev)
+{
+	struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
+
+	snd_power_change_state(dw->card, SNDRV_CTL_POWER_D0);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(snd_dw_hdmi_pm, snd_dw_hdmi_suspend,
+			 snd_dw_hdmi_resume);
+#define PM_OPS &snd_dw_hdmi_pm
+#else
+#define PM_OPS NULL
+#endif
+
+static struct platform_driver snd_dw_hdmi_driver = {
+	.probe	= snd_dw_hdmi_probe,
+	.remove	= snd_dw_hdmi_remove,
+	.driver	= {
+		.name = DRIVER_NAME,
+		.owner = THIS_MODULE,
+		.pm = PM_OPS,
+	},
+};
+
+module_platform_driver(snd_dw_hdmi_driver);
+
+MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
+MODULE_DESCRIPTION("Synopsis Designware HDMI AHB ALSA interface");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);

drivers/gpu/drm/bridge/dw_hdmi-audio.h

+#ifndef DW_HDMI_AUDIO_H
+#define DW_HDMI_AUDIO_H
+
+struct dw_hdmi;
+
+struct dw_hdmi_audio_data {
+	phys_addr_t phys;
+	void __iomem *base;
+	int irq;
+	struct dw_hdmi *hdmi;
+	u8 *eld;
+};
+
+#endif

drivers/gpu/drm/bridge/dw_hdmi.c

@@ -28,6 +28,7 @@
 #include <drm/bridge/dw_hdmi.h>
 
 #include "dw_hdmi.h"
+#include "dw_hdmi-audio.h"
 
 #define HDMI_EDID_LEN		512
 
@@ -104,6 +105,7 @@ struct dw_hdmi {
 	struct drm_encoder *encoder;
 	struct drm_bridge *bridge;
 
+	struct platform_device *audio;
 	enum dw_hdmi_devtype dev_type;
 	struct device *dev;
 	struct clk *isfr_clk;
@@ -126,7 +128,11 @@ struct dw_hdmi {
 	bool sink_has_audio;
 
 	struct mutex mutex;		/* for state below and previous_mode */
+	enum drm_connector_force force;	/* mutex-protected force state */
 	bool disabled;			/* DRM has disabled our bridge */
+	bool bridge_is_on;		/* indicates the bridge is on */
+	bool rxsense;			/* rxsense state */
+	u8 phy_mask;			/* desired phy int mask settings */
 
 	spinlock_t audio_lock;
 	struct mutex audio_mutex;
@@ -134,12 +140,19 @@ struct dw_hdmi {
 	unsigned int audio_cts;
 	unsigned int audio_n;
 	bool audio_enable;
-	int ratio;
 
 	void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
 	u8 (*read)(struct dw_hdmi *hdmi, int offset);
 };
 
+#define HDMI_IH_PHY_STAT0_RX_SENSE \
+	(HDMI_IH_PHY_STAT0_RX_SENSE0 | HDMI_IH_PHY_STAT0_RX_SENSE1 | \
+	 HDMI_IH_PHY_STAT0_RX_SENSE2 | HDMI_IH_PHY_STAT0_RX_SENSE3)
+
+#define HDMI_PHY_RX_SENSE \
+	(HDMI_PHY_RX_SENSE0 | HDMI_PHY_RX_SENSE1 | \
+	 HDMI_PHY_RX_SENSE2 | HDMI_PHY_RX_SENSE3)
+
 static void dw_hdmi_writel(struct dw_hdmi *hdmi, u8 val, int offset)
 {
 	writel(val, hdmi->regs + (offset << 2));
@@ -203,61 +216,53 @@ static void hdmi_set_cts_n(struct dw_hdmi *hdmi, unsigned int cts,
 	hdmi_writeb(hdmi, n & 0xff, HDMI_AUD_N1);
 }
 
-static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk,
-				   unsigned int ratio)
+static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
 {
 	unsigned int n = (128 * freq) / 1000;
+	unsigned int mult = 1;
+
+	while (freq > 48000) {
+		mult *= 2;
+		freq /= 2;
+	}
 
 	switch (freq) {
 	case 32000:
-		if (pixel_clk == 25170000)
-			n = (ratio == 150) ? 9152 : 4576;
-		else if (pixel_clk == 27020000)
-			n = (ratio == 150) ? 8192 : 4096;
-		else if (pixel_clk == 74170000 || pixel_clk == 148350000)
+		if (pixel_clk == 25175000)
+			n = 4576;
+		else if (pixel_clk == 27027000)
+			n = 4096;
+		else if (pixel_clk == 74176000 || pixel_clk == 148352000)
 			n = 11648;
 		else
 			n = 4096;
+		n *= mult;
 		break;
 
 	case 44100:
-		if (pixel_clk == 25170000)
+		if (pixel_clk == 25175000)
 			n = 7007;
-		else if (pixel_clk == 74170000)
+		else if (pixel_clk == 74176000)
 			n = 17836;
-		else if (pixel_clk == 148350000)
-			n = (ratio == 150) ? 17836 : 8918;
+		else if (pixel_clk == 148352000)
+			n = 8918;
 		else
 			n = 6272;
+		n *= mult;
 		break;
 
 	case 48000:
-		if (pixel_clk == 25170000)
-			n = (ratio == 150) ? 9152 : 6864;
-		else if (pixel_clk == 27020000)
-			n = (ratio == 150) ? 8192 : 6144;
-		else if (pixel_clk == 74170000)
+		if (pixel_clk == 25175000)
+			n = 6864;
+		else if (pixel_clk == 27027000)
+			n = 6144;
+		else if (pixel_clk == 74176000)
 			n = 11648;
-		else if (pixel_clk == 148350000)
-			n = (ratio == 150) ? 11648 : 5824;
+		else if (pixel_clk == 148352000)
+			n = 5824;
 		else
 			n = 6144;
-		break;
-
-	case 88200:
-		n = hdmi_compute_n(44100, pixel_clk, ratio) * 2;
-		break;
-
-	case 96000:
-		n = hdmi_compute_n(48000, pixel_clk, ratio) * 2;
-		break;
-
-	case 176400:
-		n = hdmi_compute_n(44100, pixel_clk, ratio) * 4;
-		break;
-
-	case 192000:
-		n = hdmi_compute_n(48000, pixel_clk, ratio) * 4;
+		n *= mult;
 		break;
 
 	default:
@@ -267,93 +272,29 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk,
 	return n;
 }
 
-static unsigned int hdmi_compute_cts(unsigned int freq, unsigned long pixel_clk,
-				     unsigned int ratio)
-{
-	unsigned int cts = 0;
-
-	pr_debug("%s: freq: %d pixel_clk: %ld ratio: %d\n", __func__, freq,
-		 pixel_clk, ratio);
-
-	switch (freq) {
-	case 32000:
-		if (pixel_clk == 297000000) {
-			cts = 222750;
-			break;
-		}
-	case 48000:
-	case 96000:
-	case 192000:
-		switch (pixel_clk) {
-		case 25200000:
-		case 27000000:
-		case 54000000:
-		case 74250000:
-		case 148500000:
-			cts = pixel_clk / 1000;
-			break;
-		case 297000000:
-			cts = 247500;
-			break;
-		/*
-		 * All other TMDS clocks are not supported by
-		 * DWC_hdmi_tx. The TMDS clocks divided or
-		 * multiplied by 1,001 coefficients are not
-		 * supported.
-		 */
-		default:
-			break;
-		}
-		break;
-	case 44100:
-	case 88200:
-	case 176400:
-		switch (pixel_clk) {
-		case 25200000:
-			cts = 28000;
-			break;
-		case 27000000:
-			cts = 30000;
-			break;
-		case 54000000:
-			cts = 60000;
-			break;
-		case 74250000:
-			cts = 82500;
-			break;
-		case 148500000:
-			cts = 165000;
-			break;
-		case 297000000:
-			cts = 247500;
-			break;
-		default:
-			break;
-		}
-		break;
-	default:
-		break;
-	}
-	if (ratio == 100)
-		return cts;
-	return (cts * ratio) / 100;
-}
-
 static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
-	unsigned long pixel_clk, unsigned int sample_rate, unsigned int ratio)
+	unsigned long pixel_clk, unsigned int sample_rate)
 {
+	unsigned long ftdms = pixel_clk;
 	unsigned int n, cts;
+	u64 tmp;
 
-	n = hdmi_compute_n(sample_rate, pixel_clk, ratio);
-	cts = hdmi_compute_cts(sample_rate, pixel_clk, ratio);
-	if (!cts) {
-		dev_err(hdmi->dev,
-			"%s: pixel clock/sample rate not supported: %luMHz / %ukHz\n",
-			__func__, pixel_clk, sample_rate);
-	}
+	n = hdmi_compute_n(sample_rate, pixel_clk);
+
+	/*
+	 * Compute the CTS value from the N value.  Note that CTS and N
+	 * can be up to 20 bits in total, so we need 64-bit math.  Also
+	 * note that our TDMS clock is not fully accurate; it is accurate
+	 * to kHz.  This can introduce an unnecessary remainder in the
+	 * calculation below, so we don't try to warn about that.
+	 */
+	tmp = (u64)ftdms * n;
+	do_div(tmp, 128 * sample_rate);
+	cts = tmp;
 
-	dev_dbg(hdmi->dev, "%s: samplerate=%ukHz ratio=%d pixelclk=%luMHz N=%d cts=%d\n",
-		__func__, sample_rate, ratio, pixel_clk, n, cts);
+	dev_dbg(hdmi->dev, "%s: fs=%uHz ftdms=%lu.%03luMHz N=%d cts=%d\n",
+		__func__, sample_rate, ftdms / 1000000, (ftdms / 1000) % 1000,
+		n, cts);
 
 	spin_lock_irq(&hdmi->audio_lock);
 	hdmi->audio_n = n;
@@ -365,8 +306,7 @@ static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
 static void hdmi_init_clk_regenerator(struct dw_hdmi *hdmi)
 {
 	mutex_lock(&hdmi->audio_mutex);
-	hdmi_set_clk_regenerator(hdmi, 74250000, hdmi->sample_rate,
-				 hdmi->ratio);
+	hdmi_set_clk_regenerator(hdmi, 74250000, hdmi->sample_rate);
 	mutex_unlock(&hdmi->audio_mutex);
 }
 
@@ -374,7 +314,7 @@ static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
 {
 	mutex_lock(&hdmi->audio_mutex);
 	hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
-				 hdmi->sample_rate, hdmi->ratio);
+				 hdmi->sample_rate);
 	mutex_unlock(&hdmi->audio_mutex);
 }
 
@@ -383,7 +323,7 @@ void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
 	mutex_lock(&hdmi->audio_mutex);
 	hdmi->sample_rate = rate;
 	hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
-				 hdmi->sample_rate, hdmi->ratio);
+				 hdmi->sample_rate);
 	mutex_unlock(&hdmi->audio_mutex);
 }
 EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_rate);
@@ -1063,6 +1003,7 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
 	u8 inv_val;
 	struct hdmi_vmode *vmode = &hdmi->hdmi_data.video_mode;
 	int hblank, vblank, h_de_hs, v_de_vs, hsync_len, vsync_len;
+	unsigned int vdisplay;
 
 	vmode->mpixelclock = mode->clock * 1000;
 
@@ -1102,13 +1043,29 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
 
 	hdmi_writeb(hdmi, inv_val, HDMI_FC_INVIDCONF);
 
+	vdisplay = mode->vdisplay;
+	vblank = mode->vtotal - mode->vdisplay;
+	v_de_vs = mode->vsync_start - mode->vdisplay;
+	vsync_len = mode->vsync_end - mode->vsync_start;
+
+	/*
+	 * When we're setting an interlaced mode, we need
+	 * to adjust the vertical timing to suit.
+	 */
+	if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
+		vdisplay /= 2;
+		vblank /= 2;
+		v_de_vs /= 2;
+		vsync_len /= 2;
+	}
+
 	/* Set up horizontal active pixel width */
 	hdmi_writeb(hdmi, mode->hdisplay >> 8, HDMI_FC_INHACTV1);
 	hdmi_writeb(hdmi, mode->hdisplay, HDMI_FC_INHACTV0);
 
 	/* Set up vertical active lines */
-	hdmi_writeb(hdmi, mode->vdisplay >> 8, HDMI_FC_INVACTV1);
-	hdmi_writeb(hdmi, mode->vdisplay, HDMI_FC_INVACTV0);
+	hdmi_writeb(hdmi, vdisplay >> 8, HDMI_FC_INVACTV1);
+	hdmi_writeb(hdmi, vdisplay, HDMI_FC_INVACTV0);
 
 	/* Set up horizontal blanking pixel region width */
 	hblank = mode->htotal - mode->hdisplay;
@@ -1116,7 +1073,6 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
 	hdmi_writeb(hdmi, hblank, HDMI_FC_INHBLANK0);
 
 	/* Set up vertical blanking pixel region width */
-	vblank = mode->vtotal - mode->vdisplay;
 	hdmi_writeb(hdmi, vblank, HDMI_FC_INVBLANK);
 
 	/* Set up HSYNC active edge delay width (in pixel clks) */
@@ -1125,7 +1081,6 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
 	hdmi_writeb(hdmi, h_de_hs, HDMI_FC_HSYNCINDELAY0);
 
 	/* Set up VSYNC active edge delay (in lines) */
-	v_de_vs = mode->vsync_start - mode->vdisplay;
 	hdmi_writeb(hdmi, v_de_vs, HDMI_FC_VSYNCINDELAY);
 
 	/* Set up HSYNC active pulse width (in pixel clks) */
@@ -1134,7 +1089,6 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
 	hdmi_writeb(hdmi, hsync_len, HDMI_FC_HSYNCINWIDTH0);
 
 	/* Set up VSYNC active edge delay (in lines) */
-	vsync_len = mode->vsync_end - mode->vsync_start;
 	hdmi_writeb(hdmi, vsync_len, HDMI_FC_VSYNCINWIDTH);
 }
 
@@ -1302,10 +1256,11 @@ static int dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
 		    HDMI_PHY_I2CM_CTLINT_ADDR);
 
 	/* enable cable hot plug irq */
-	hdmi_writeb(hdmi, (u8)~HDMI_PHY_HPD, HDMI_PHY_MASK0);
+	hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
 
 	/* Clear Hotplug interrupts */
-	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD, HDMI_IH_PHY_STAT0);
+	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
+		    HDMI_IH_PHY_STAT0);
 
 	return 0;
 }
@@ -1364,12 +1319,61 @@ static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi)
 
 static void dw_hdmi_poweron(struct dw_hdmi *hdmi)
 {
+	hdmi->bridge_is_on = true;
 	dw_hdmi_setup(hdmi, &hdmi->previous_mode);
 }
 
 static void dw_hdmi_poweroff(struct dw_hdmi *hdmi)
 {
 	dw_hdmi_phy_disable(hdmi);
+	hdmi->bridge_is_on = false;
+}
+
+static void dw_hdmi_update_power(struct dw_hdmi *hdmi)
+{
+	int force = hdmi->force;
+
+	if (hdmi->disabled) {
+		force = DRM_FORCE_OFF;
+	} else if (force == DRM_FORCE_UNSPECIFIED) {
+		if (hdmi->rxsense)
+			force = DRM_FORCE_ON;
+		else
+			force = DRM_FORCE_OFF;
+	}
+
+	if (force == DRM_FORCE_OFF) {
+		if (hdmi->bridge_is_on)
+			dw_hdmi_poweroff(hdmi);
+	} else {
+		if (!hdmi->bridge_is_on)
+			dw_hdmi_poweron(hdmi);
+	}
+}
+
+/*
+ * Adjust the detection of RXSENSE according to whether we have a forced
+ * connection mode enabled, or whether we have been disabled.  There is
+ * no point processing RXSENSE interrupts if we have a forced connection
+ * state, or DRM has us disabled.
+ *
+ * We also disable rxsense interrupts when we think we're disconnected
+ * to avoid floating TDMS signals giving false rxsense interrupts.
+ *
+ * Note: we still need to listen for HPD interrupts even when DRM has us
+ * disabled so that we can detect a connect event.
+ */
+static void dw_hdmi_update_phy_mask(struct dw_hdmi *hdmi)
+{
+	u8 old_mask = hdmi->phy_mask;
+
+	if (hdmi->force || hdmi->disabled || !hdmi->rxsense)
+		hdmi->phy_mask |= HDMI_PHY_RX_SENSE;
+	else
+		hdmi->phy_mask &= ~HDMI_PHY_RX_SENSE;
+
+	if (old_mask != hdmi->phy_mask)
+		hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
 }
 
 static void dw_hdmi_bridge_mode_set(struct drm_bridge *bridge,
@@ -1399,7 +1403,8 @@ static void dw_hdmi_bridge_disable(struct drm_bridge *bridge)
 
 	mutex_lock(&hdmi->mutex);
 	hdmi->disabled = true;
-	dw_hdmi_poweroff(hdmi);
+	dw_hdmi_update_power(hdmi);
+	dw_hdmi_update_phy_mask(hdmi);
 	mutex_unlock(&hdmi->mutex);
 }
 
@@ -1408,8 +1413,9 @@ static void dw_hdmi_bridge_enable(struct drm_bridge *bridge)
 	struct dw_hdmi *hdmi = bridge->driver_private;
 
 	mutex_lock(&hdmi->mutex);
-	dw_hdmi_poweron(hdmi);
 	hdmi->disabled = false;
+	dw_hdmi_update_power(hdmi);
+	dw_hdmi_update_phy_mask(hdmi);
 	mutex_unlock(&hdmi->mutex);
 }
 
@@ -1424,6 +1430,12 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
 	struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
 					     connector);
 
+	mutex_lock(&hdmi->mutex);
+	hdmi->force = DRM_FORCE_UNSPECIFIED;
+	dw_hdmi_update_power(hdmi);
+	dw_hdmi_update_phy_mask(hdmi);
+	mutex_unlock(&hdmi->mutex);
+
 	return hdmi_readb(hdmi, HDMI_PHY_STAT0) & HDMI_PHY_HPD ?
 		connector_status_connected : connector_status_disconnected;
 }
@@ -1447,6 +1459,8 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
 		hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
 		drm_mode_connector_update_edid_property(connector, edid);
 		ret = drm_add_edid_modes(connector, edid);
+		/* Store the ELD */
+		drm_edid_to_eld(connector, edid);
 		kfree(edid);
 	} else {
 		dev_dbg(hdmi->dev, "failed to get edid\n");
@@ -1488,11 +1502,24 @@ static void dw_hdmi_connector_destroy(struct drm_connector *connector)
 	drm_connector_cleanup(connector);
 }
 
+static void dw_hdmi_connector_force(struct drm_connector *connector)
+{
+	struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
+					     connector);
+
+	mutex_lock(&hdmi->mutex);
+	hdmi->force = connector->force;
+	dw_hdmi_update_power(hdmi);
+	dw_hdmi_update_phy_mask(hdmi);
+	mutex_unlock(&hdmi->mutex);
+}
+
 static struct drm_connector_funcs dw_hdmi_connector_funcs = {
 	.dpms = drm_helper_connector_dpms,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.detect = dw_hdmi_connector_detect,
 	.destroy = dw_hdmi_connector_destroy,
+	.force = dw_hdmi_connector_force,
 };
 
 static struct drm_connector_helper_funcs dw_hdmi_connector_helper_funcs = {
@@ -1525,33 +1552,69 @@ static irqreturn_t dw_hdmi_hardirq(int irq, void *dev_id)
 static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
 {
 	struct dw_hdmi *hdmi = dev_id;
-	u8 intr_stat;
-	u8 phy_int_pol;
+	u8 intr_stat, phy_int_pol, phy_pol_mask, phy_stat;
 
 	intr_stat = hdmi_readb(hdmi, HDMI_IH_PHY_STAT0);
-
 	phy_int_pol = hdmi_readb(hdmi, HDMI_PHY_POL0);
+	phy_stat = hdmi_readb(hdmi, HDMI_PHY_STAT0);
+
+	phy_pol_mask = 0;
+	if (intr_stat & HDMI_IH_PHY_STAT0_HPD)
+		phy_pol_mask |= HDMI_PHY_HPD;
+	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE0)
+		phy_pol_mask |= HDMI_PHY_RX_SENSE0;
+	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE1)
+		phy_pol_mask |= HDMI_PHY_RX_SENSE1;
+	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE2)
+		phy_pol_mask |= HDMI_PHY_RX_SENSE2;
+	if (intr_stat & HDMI_IH_PHY_STAT0_RX_SENSE3)
+		phy_pol_mask |= HDMI_PHY_RX_SENSE3;
+
+	if (phy_pol_mask)
+		hdmi_modb(hdmi, ~phy_int_pol, phy_pol_mask, HDMI_PHY_POL0);
 
-	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
-		hdmi_modb(hdmi, ~phy_int_pol, HDMI_PHY_HPD, HDMI_PHY_POL0);
+	/*
+	 * RX sense tells us whether the TDMS transmitters are detecting
+	 * load - in other words, there's something listening on the
+	 * other end of the link.  Use this to decide whether we should
+	 * power on the phy as HPD may be toggled by the sink to merely
+	 * ask the source to re-read the EDID.
+	 */
+	if (intr_stat &
+	    (HDMI_IH_PHY_STAT0_RX_SENSE | HDMI_IH_PHY_STAT0_HPD)) {
 		mutex_lock(&hdmi->mutex);
-		if (phy_int_pol & HDMI_PHY_HPD) {
-			dev_dbg(hdmi->dev, "EVENT=plugin\n");
-
-			if (!hdmi->disabled)
-				dw_hdmi_poweron(hdmi);
-		} else {
-			dev_dbg(hdmi->dev, "EVENT=plugout\n");
-
-			if (!hdmi->disabled)
-				dw_hdmi_poweroff(hdmi);
+		if (!hdmi->disabled && !hdmi->force) {
+			/*
+			 * If the RX sense status indicates we're disconnected,
+			 * clear the software rxsense status.
+			 */
+			if (!(phy_stat & HDMI_PHY_RX_SENSE))
+				hdmi->rxsense = false;
+
+			/*
+			 * Only set the software rxsense status when both
+			 * rxsense and hpd indicates we're connected.
+			 * This avoids what seems to be bad behaviour in
+			 * at least iMX6S versions of the phy.
+			 */
+			if (phy_stat & HDMI_PHY_HPD)
+				hdmi->rxsense = true;
+
+			dw_hdmi_update_power(hdmi);
+			dw_hdmi_update_phy_mask(hdmi);
 		}
 		mutex_unlock(&hdmi->mutex);
+	}
+
+	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
+		dev_dbg(hdmi->dev, "EVENT=%s\n",
+			phy_int_pol & HDMI_PHY_HPD ? "plugin" : "plugout");
 		drm_helper_hpd_irq_event(hdmi->bridge->dev);
 	}
 
 	hdmi_writeb(hdmi, intr_stat, HDMI_IH_PHY_STAT0);
-	hdmi_writeb(hdmi, ~HDMI_IH_PHY_STAT0_HPD, HDMI_IH_MUTE_PHY_STAT0);
+	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
+		    HDMI_IH_MUTE_PHY_STAT0);
 
 	return IRQ_HANDLED;
 }
@@ -1599,7 +1662,9 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
 {
 	struct drm_device *drm = data;
 	struct device_node *np = dev->of_node;
+	struct platform_device_info pdevinfo;
 	struct device_node *ddc_node;
+	struct dw_hdmi_audio_data audio;
 	struct dw_hdmi *hdmi;
 	int ret;
 	u32 val = 1;
@@ -1608,13 +1673,16 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
 	if (!hdmi)
 		return -ENOMEM;
 
+	hdmi->connector.interlace_allowed = 1;
+
 	hdmi->plat_data = plat_data;
 	hdmi->dev = dev;
 	hdmi->dev_type = plat_data->dev_type;
 	hdmi->sample_rate = 48000;
-	hdmi->ratio = 100;
 	hdmi->encoder = encoder;
 	hdmi->disabled = true;
+	hdmi->rxsense = true;
+	hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
 
 	mutex_init(&hdmi->mutex);
 	mutex_init(&hdmi->audio_mutex);
@@ -1705,10 +1773,11 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
 	 * Configure registers related to HDMI interrupt
 	 * generation before registering IRQ.
 	 */
-	hdmi_writeb(hdmi, HDMI_PHY_HPD, HDMI_PHY_POL0);
+	hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);
 
 	/* Clear Hotplug interrupts */
-	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD, HDMI_IH_PHY_STAT0);
+	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
+		    HDMI_IH_PHY_STAT0);
 
 	ret = dw_hdmi_fb_registered(hdmi);
 	if (ret)
@@ -1719,7 +1788,26 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
 		goto err_iahb;
 
 	/* Unmute interrupts */
-	hdmi_writeb(hdmi, ~HDMI_IH_PHY_STAT0_HPD, HDMI_IH_MUTE_PHY_STAT0);
+	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
+		    HDMI_IH_MUTE_PHY_STAT0);
+
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+	pdevinfo.parent = dev;
+	pdevinfo.id = PLATFORM_DEVID_AUTO;
+
+	if (hdmi_readb(hdmi, HDMI_CONFIG1_ID) & HDMI_CONFIG1_AHB) {
+		audio.phys = iores->start;
+		audio.base = hdmi->regs;
+		audio.irq = irq;
+		audio.hdmi = hdmi;
+		audio.eld = hdmi->connector.eld;
+
+		pdevinfo.name = "dw-hdmi-ahb-audio";
+		pdevinfo.data = &audio;
+		pdevinfo.size_data = sizeof(audio);
+		pdevinfo.dma_mask = DMA_BIT_MASK(32);
+		hdmi->audio = platform_device_register_full(&pdevinfo);
+	}
 
 	dev_set_drvdata(dev, hdmi);
 
@@ -1738,6 +1826,9 @@ void dw_hdmi_unbind(struct device *dev, struct device *master, void *data)
 {
 	struct dw_hdmi *hdmi = dev_get_drvdata(dev);
 
+	if (hdmi->audio && !IS_ERR(hdmi->audio))
+		platform_device_unregister(hdmi->audio);
+
 	/* Disable all interrupts */
 	hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
 

drivers/gpu/drm/bridge/dw_hdmi.h

@@ -545,6 +545,9 @@
 #define HDMI_I2CM_FS_SCL_LCNT_0_ADDR            0x7E12
 
 enum {
+/* CONFIG1_ID field values */
+	HDMI_CONFIG1_AHB = 0x01,
+
 /* IH_FC_INT2 field values */
 	HDMI_IH_FC_INT2_OVERFLOW_MASK = 0x03,
 	HDMI_IH_FC_INT2_LOW_PRIORITY_OVERFLOW = 0x02,

drivers/gpu/ipu-v3/ipu-dc.c

@@ -183,12 +183,19 @@ int ipu_dc_init_sync(struct ipu_dc *dc, struct ipu_di *di, bool interlaced,
 	}
 
 	if (interlaced) {
-		dc_link_event(dc, DC_EVT_NL, 0, 3);
-		dc_link_event(dc, DC_EVT_EOL, 0, 2);
-		dc_link_event(dc, DC_EVT_NEW_DATA, 0, 1);
+		int addr;
+
+		if (dc->di)
+			addr = 1;
+		else
+			addr = 0;
+
+		dc_link_event(dc, DC_EVT_NL, addr, 3);
+		dc_link_event(dc, DC_EVT_EOL, addr, 2);
+		dc_link_event(dc, DC_EVT_NEW_DATA, addr, 1);
 
 		/* Init template microcode */
-		dc_write_tmpl(dc, 0, WROD(0), 0, map, SYNC_WAVE, 0, 8, 1);
+		dc_write_tmpl(dc, addr, WROD(0), 0, map, SYNC_WAVE, 0, 6, 1);
 	} else {
 		if (dc->di) {
 			dc_link_event(dc, DC_EVT_NL, 2, 3);

drivers/gpu/ipu-v3/ipu-di.c

@@ -71,6 +71,10 @@ enum di_sync_wave {
 	DI_SYNC_HSYNC = 3,
 	DI_SYNC_VSYNC = 4,
 	DI_SYNC_DE = 6,
+
+	DI_SYNC_CNT1 = 2,	/* counter >= 2 only */
+	DI_SYNC_CNT4 = 5,	/* counter >= 5 only */
+	DI_SYNC_CNT5 = 6,	/* counter >= 6 only */
 };
 
 #define SYNC_WAVE 0
@@ -211,66 +215,59 @@ static void ipu_di_sync_config_interlaced(struct ipu_di *di,
 		sig->mode.hback_porch + sig->mode.hfront_porch;
 	u32 v_total = sig->mode.vactive + sig->mode.vsync_len +
 		sig->mode.vback_porch + sig->mode.vfront_porch;
-	u32 reg;
 	struct di_sync_config cfg[] = {
 		{
-			.run_count = h_total / 2 - 1,
-			.run_src = DI_SYNC_CLK,
+			/* 1: internal VSYNC for each frame */
+			.run_count = v_total * 2 - 1,
+			.run_src = 3,			/* == counter 7 */
 		}, {
-			.run_count = h_total - 11,
+			/* PIN2: HSYNC waveform */
+			.run_count = h_total - 1,
 			.run_src = DI_SYNC_CLK,
-			.cnt_down = 4,
+			.cnt_polarity_gen_en = 1,
+			.cnt_polarity_trigger_src = DI_SYNC_CLK,
+			.cnt_down = sig->mode.hsync_len * 2,
 		}, {
-			.run_count = v_total * 2 - 1,
-			.run_src = DI_SYNC_INT_HSYNC,
-			.offset_count = 1,
-			.offset_src = DI_SYNC_INT_HSYNC,
-			.cnt_down = 4,
+			/* PIN3: VSYNC waveform */
+			.run_count = v_total - 1,
+			.run_src = 4,			/* == counter 7 */
+			.cnt_polarity_gen_en = 1,
+			.cnt_polarity_trigger_src = 4,	/* == counter 7 */
+			.cnt_down = sig->mode.vsync_len * 2,
+			.cnt_clr_src = DI_SYNC_CNT1,
 		}, {
-			.run_count = v_total / 2 - 1,
+			/* 4: Field */
+			.run_count = v_total / 2,
 			.run_src = DI_SYNC_HSYNC,
-			.offset_count = sig->mode.vback_porch,
-			.offset_src = DI_SYNC_HSYNC,
+			.offset_count = h_total / 2,
+			.offset_src = DI_SYNC_CLK,
 			.repeat_count = 2,
-			.cnt_clr_src = DI_SYNC_VSYNC,
-		}, {
-			.run_src = DI_SYNC_HSYNC,
-			.repeat_count = sig->mode.vactive / 2,
-			.cnt_clr_src = 4,
-		}, {
-			.run_count = v_total - 1,
-			.run_src = DI_SYNC_HSYNC,
+			.cnt_clr_src = DI_SYNC_CNT1,
 		}, {
-			.run_count = v_total / 2 - 1,
+			/* 5: Active lines */
 			.run_src = DI_SYNC_HSYNC,
-			.offset_count = 9,
+			.offset_count = (sig->mode.vsync_len +
+					 sig->mode.vback_porch) / 2,
 			.offset_src = DI_SYNC_HSYNC,
-			.repeat_count = 2,
-			.cnt_clr_src = DI_SYNC_VSYNC,
+			.repeat_count = sig->mode.vactive / 2,
+			.cnt_clr_src = DI_SYNC_CNT4,
 		}, {
+			/* 6: Active pixel, referenced by DC */
 			.run_src = DI_SYNC_CLK,
-			.offset_count = sig->mode.hback_porch,
+			.offset_count = sig->mode.hsync_len +
+					sig->mode.hback_porch,
 			.offset_src = DI_SYNC_CLK,
 			.repeat_count = sig->mode.hactive,
-			.cnt_clr_src = 5,
+			.cnt_clr_src = DI_SYNC_CNT5,
 		}, {
-			.run_count = v_total - 1,
-			.run_src = DI_SYNC_INT_HSYNC,
-			.offset_count = v_total / 2,
-			.offset_src = DI_SYNC_INT_HSYNC,
-			.cnt_clr_src = DI_SYNC_HSYNC,
-			.cnt_down = 4,
+			/* 7: Half line HSYNC */
+			.run_count = h_total / 2 - 1,
+			.run_src = DI_SYNC_CLK,
 		}
 	};
 
 	ipu_di_sync_config(di, cfg, 0, ARRAY_SIZE(cfg));
 
-	/* set gentime select and tag sel */
-	reg = ipu_di_read(di, DI_SW_GEN1(9));
-	reg &= 0x1FFFFFFF;
-	reg |= (3 - 1) << 29 | 0x00008000;
-	ipu_di_write(di, reg, DI_SW_GEN1(9));
-
 	ipu_di_write(di, v_total / 2 - 1, DI_SCR_CONF);
 }
 
@@ -543,6 +540,29 @@ int ipu_di_adjust_videomode(struct ipu_di *di, struct videomode *mode)
 }
 EXPORT_SYMBOL_GPL(ipu_di_adjust_videomode);
 
+static u32 ipu_di_gen_polarity(int pin)
+{
+	switch (pin) {
+	case 1:
+		return DI_GEN_POLARITY_1;
+	case 2:
+		return DI_GEN_POLARITY_2;
+	case 3:
+		return DI_GEN_POLARITY_3;
+	case 4:
+		return DI_GEN_POLARITY_4;
+	case 5:
+		return DI_GEN_POLARITY_5;
+	case 6:
+		return DI_GEN_POLARITY_6;
+	case 7:
+		return DI_GEN_POLARITY_7;
+	case 8:
+		return DI_GEN_POLARITY_8;
+	}
+	return 0;
+}
+
 int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig)
 {
 	u32 reg;
@@ -582,15 +602,8 @@ int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig)
 
 		/* set y_sel = 1 */
 		di_gen |= 0x10000000;
-		di_gen |= DI_GEN_POLARITY_5;
-		di_gen |= DI_GEN_POLARITY_8;
-
-		vsync_cnt = 7;
 
-		if (sig->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH)
-			di_gen |= DI_GEN_POLARITY_3;
-		if (sig->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH)
-			di_gen |= DI_GEN_POLARITY_2;
+		vsync_cnt = 3;
 	} else {
 		ipu_di_sync_config_noninterlaced(di, sig, div);
 
@@ -602,25 +615,13 @@ int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig)
 			 */
 			if (!(sig->hsync_pin == 2 && sig->vsync_pin == 3))
 				vsync_cnt = 6;
-
-		if (sig->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH) {
-			if (sig->hsync_pin == 2)
-				di_gen |= DI_GEN_POLARITY_2;
-			else if (sig->hsync_pin == 4)
-				di_gen |= DI_GEN_POLARITY_4;
-			else if (sig->hsync_pin == 7)
-				di_gen |= DI_GEN_POLARITY_7;
-		}
-		if (sig->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH) {
-			if (sig->vsync_pin == 3)
-				di_gen |= DI_GEN_POLARITY_3;
-			else if (sig->vsync_pin == 6)
-				di_gen |= DI_GEN_POLARITY_6;
-			else if (sig->vsync_pin == 8)
-				di_gen |= DI_GEN_POLARITY_8;
-		}
 	}
 
+	if (sig->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH)
+		di_gen |= ipu_di_gen_polarity(sig->hsync_pin);
+	if (sig->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH)
+		di_gen |= ipu_di_gen_polarity(sig->vsync_pin);
+
 	if (sig->clk_pol)
 		di_gen |= DI_GEN_POLARITY_DISP_CLK;