Initial import

1 files changed, 1014 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
new file mode 100644
index 000000000..b728523e1
--- /dev/null
+++ b/drivers/gpu/drm/i2c/adv7511.c
@@ -0,0 +1,1014 @@
+/*
+ * Analog Devices ADV7511 HDMI transmitter driver
+ *
+ * Copyright 2012 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_encoder_slave.h>
+
+#include "adv7511.h"
+
+struct adv7511 {
+	struct i2c_client *i2c_main;
+	struct i2c_client *i2c_edid;
+
+	struct regmap *regmap;
+	struct regmap *packet_memory_regmap;
+	enum drm_connector_status status;
+	bool powered;
+
+	unsigned int f_tmds;
+
+	unsigned int current_edid_segment;
+	uint8_t edid_buf[256];
+	bool edid_read;
+
+	wait_queue_head_t wq;
+	struct drm_encoder *encoder;
+
+	bool embedded_sync;
+	enum adv7511_sync_polarity vsync_polarity;
+	enum adv7511_sync_polarity hsync_polarity;
+	bool rgb;
+
+	struct edid *edid;
+
+	struct gpio_desc *gpio_pd;
+};
+
+static struct adv7511 *encoder_to_adv7511(struct drm_encoder *encoder)
+{
+	return to_encoder_slave(encoder)->slave_priv;
+}
+
+/* ADI recommended values for proper operation. */
+static const struct reg_default adv7511_fixed_registers[] = {
+	{ 0x98, 0x03 },
+	{ 0x9a, 0xe0 },
+	{ 0x9c, 0x30 },
+	{ 0x9d, 0x61 },
+	{ 0xa2, 0xa4 },
+	{ 0xa3, 0xa4 },
+	{ 0xe0, 0xd0 },
+	{ 0xf9, 0x00 },
+	{ 0x55, 0x02 },
+};
+
+/* -----------------------------------------------------------------------------
+ * Register access
+ */
+
+static const uint8_t adv7511_register_defaults[] = {
+	0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00 */
+	0x00, 0x00, 0x01, 0x0e, 0xbc, 0x18, 0x01, 0x13,
+	0x25, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 10 */
+	0x46, 0x62, 0x04, 0xa8, 0x00, 0x00, 0x1c, 0x84,
+	0x1c, 0xbf, 0x04, 0xa8, 0x1e, 0x70, 0x02, 0x1e, /* 20 */
+	0x00, 0x00, 0x04, 0xa8, 0x08, 0x12, 0x1b, 0xac,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 30 */
+	0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0xb0,
+	0x00, 0x50, 0x90, 0x7e, 0x79, 0x70, 0x00, 0x00, /* 40 */
+	0x00, 0xa8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x02, 0x0d, 0x00, 0x00, 0x00, 0x00, /* 50 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 60 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x01, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 70 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 80 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, /* 90 */
+	0x0b, 0x02, 0x00, 0x18, 0x5a, 0x60, 0x00, 0x00,
+	0x00, 0x00, 0x80, 0x80, 0x08, 0x04, 0x00, 0x00, /* a0 */
+	0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x40, 0x14,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* b0 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* c0 */
+	0x00, 0x03, 0x00, 0x00, 0x02, 0x00, 0x01, 0x04,
+	0x30, 0xff, 0x80, 0x80, 0x80, 0x00, 0x00, 0x00, /* d0 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x01,
+	0x80, 0x75, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, /* e0 */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x11, 0x00, /* f0 */
+	0x00, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static bool adv7511_register_volatile(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case ADV7511_REG_CHIP_REVISION:
+	case ADV7511_REG_SPDIF_FREQ:
+	case ADV7511_REG_CTS_AUTOMATIC1:
+	case ADV7511_REG_CTS_AUTOMATIC2:
+	case ADV7511_REG_VIC_DETECTED:
+	case ADV7511_REG_VIC_SEND:
+	case ADV7511_REG_AUX_VIC_DETECTED:
+	case ADV7511_REG_STATUS:
+	case ADV7511_REG_GC(1):
+	case ADV7511_REG_INT(0):
+	case ADV7511_REG_INT(1):
+	case ADV7511_REG_PLL_STATUS:
+	case ADV7511_REG_AN(0):
+	case ADV7511_REG_AN(1):
+	case ADV7511_REG_AN(2):
+	case ADV7511_REG_AN(3):
+	case ADV7511_REG_AN(4):
+	case ADV7511_REG_AN(5):
+	case ADV7511_REG_AN(6):
+	case ADV7511_REG_AN(7):
+	case ADV7511_REG_HDCP_STATUS:
+	case ADV7511_REG_BCAPS:
+	case ADV7511_REG_BKSV(0):
+	case ADV7511_REG_BKSV(1):
+	case ADV7511_REG_BKSV(2):
+	case ADV7511_REG_BKSV(3):
+	case ADV7511_REG_BKSV(4):
+	case ADV7511_REG_DDC_STATUS:
+	case ADV7511_REG_BSTATUS(0):
+	case ADV7511_REG_BSTATUS(1):
+	case ADV7511_REG_CHIP_ID_HIGH:
+	case ADV7511_REG_CHIP_ID_LOW:
+		return true;
+	}
+
+	return false;
+}
+
+static const struct regmap_config adv7511_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = 0xff,
+	.cache_type = REGCACHE_RBTREE,
+	.reg_defaults_raw = adv7511_register_defaults,
+	.num_reg_defaults_raw = ARRAY_SIZE(adv7511_register_defaults),
+
+	.volatile_reg = adv7511_register_volatile,
+};
+
+/* -----------------------------------------------------------------------------
+ * Hardware configuration
+ */
+
+static void adv7511_set_colormap(struct adv7511 *adv7511, bool enable,
+				 const uint16_t *coeff,
+				 unsigned int scaling_factor)
+{
+	unsigned int i;
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
+			   ADV7511_CSC_UPDATE_MODE, ADV7511_CSC_UPDATE_MODE);
+
+	if (enable) {
+		for (i = 0; i < 12; ++i) {
+			regmap_update_bits(adv7511->regmap,
+					   ADV7511_REG_CSC_UPPER(i),
+					   0x1f, coeff[i] >> 8);
+			regmap_write(adv7511->regmap,
+				     ADV7511_REG_CSC_LOWER(i),
+				     coeff[i] & 0xff);
+		}
+	}
+
+	if (enable)
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
+				   0xe0, 0x80 | (scaling_factor << 5));
+	else
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
+				   0x80, 0x00);
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
+			   ADV7511_CSC_UPDATE_MODE, 0);
+}
+
+static int adv7511_packet_enable(struct adv7511 *adv7511, unsigned int packet)
+{
+	if (packet & 0xff)
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
+				   packet, 0xff);
+
+	if (packet & 0xff00) {
+		packet >>= 8;
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
+				   packet, 0xff);
+	}
+
+	return 0;
+}
+
+static int adv7511_packet_disable(struct adv7511 *adv7511, unsigned int packet)
+{
+	if (packet & 0xff)
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
+				   packet, 0x00);
+
+	if (packet & 0xff00) {
+		packet >>= 8;
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
+				   packet, 0x00);
+	}
+
+	return 0;
+}
+
+/* Coefficients for adv7511 color space conversion */
+static const uint16_t adv7511_csc_ycbcr_to_rgb[] = {
+	0x0734, 0x04ad, 0x0000, 0x1c1b,
+	0x1ddc, 0x04ad, 0x1f24, 0x0135,
+	0x0000, 0x04ad, 0x087c, 0x1b77,
+};
+
+static void adv7511_set_config_csc(struct adv7511 *adv7511,
+				   struct drm_connector *connector,
+				   bool rgb)
+{
+	struct adv7511_video_config config;
+	bool output_format_422, output_format_ycbcr;
+	unsigned int mode;
+	uint8_t infoframe[17];
+
+	if (adv7511->edid)
+		config.hdmi_mode = drm_detect_hdmi_monitor(adv7511->edid);
+	else
+		config.hdmi_mode = false;
+
+	hdmi_avi_infoframe_init(&config.avi_infoframe);
+
+	config.avi_infoframe.scan_mode = HDMI_SCAN_MODE_UNDERSCAN;
+
+	if (rgb) {
+		config.csc_enable = false;
+		config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
+	} else {
+		config.csc_scaling_factor = ADV7511_CSC_SCALING_4;
+		config.csc_coefficents = adv7511_csc_ycbcr_to_rgb;
+
+		if ((connector->display_info.color_formats &
+		     DRM_COLOR_FORMAT_YCRCB422) &&
+		    config.hdmi_mode) {
+			config.csc_enable = false;
+			config.avi_infoframe.colorspace =
+				HDMI_COLORSPACE_YUV422;
+		} else {
+			config.csc_enable = true;
+			config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
+		}
+	}
+
+	if (config.hdmi_mode) {
+		mode = ADV7511_HDMI_CFG_MODE_HDMI;
+
+		switch (config.avi_infoframe.colorspace) {
+		case HDMI_COLORSPACE_YUV444:
+			output_format_422 = false;
+			output_format_ycbcr = true;
+			break;
+		case HDMI_COLORSPACE_YUV422:
+			output_format_422 = true;
+			output_format_ycbcr = true;
+			break;
+		default:
+			output_format_422 = false;
+			output_format_ycbcr = false;
+			break;
+		}
+	} else {
+		mode = ADV7511_HDMI_CFG_MODE_DVI;
+		output_format_422 = false;
+		output_format_ycbcr = false;
+	}
+
+	adv7511_packet_disable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
+
+	adv7511_set_colormap(adv7511, config.csc_enable,
+			     config.csc_coefficents,
+			     config.csc_scaling_factor);
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x81,
+			   (output_format_422 << 7) | output_format_ycbcr);
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_HDCP_HDMI_CFG,
+			   ADV7511_HDMI_CFG_MODE_MASK, mode);
+
+	hdmi_avi_infoframe_pack(&config.avi_infoframe, infoframe,
+				sizeof(infoframe));
+
+	/* The AVI infoframe id is not configurable */
+	regmap_bulk_write(adv7511->regmap, ADV7511_REG_AVI_INFOFRAME_VERSION,
+			  infoframe + 1, sizeof(infoframe) - 1);
+
+	adv7511_packet_enable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
+}
+
+static void adv7511_set_link_config(struct adv7511 *adv7511,
+				    const struct adv7511_link_config *config)
+{
+	/*
+	 * The input style values documented in the datasheet don't match the
+	 * hardware register field values :-(
+	 */
+	static const unsigned int input_styles[4] = { 0, 2, 1, 3 };
+
+	unsigned int clock_delay;
+	unsigned int color_depth;
+	unsigned int input_id;
+
+	clock_delay = (config->clock_delay + 1200) / 400;
+	color_depth = config->input_color_depth == 8 ? 3
+		    : (config->input_color_depth == 10 ? 1 : 2);
+
+	/* TODO Support input ID 6 */
+	if (config->input_colorspace != HDMI_COLORSPACE_YUV422)
+		input_id = config->input_clock == ADV7511_INPUT_CLOCK_DDR
+			 ? 5 : 0;
+	else if (config->input_clock == ADV7511_INPUT_CLOCK_DDR)
+		input_id = config->embedded_sync ? 8 : 7;
+	else if (config->input_clock == ADV7511_INPUT_CLOCK_2X)
+		input_id = config->embedded_sync ? 4 : 3;
+	else
+		input_id = config->embedded_sync ? 2 : 1;
+
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG, 0xf,
+			   input_id);
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x7e,
+			   (color_depth << 4) |
+			   (input_styles[config->input_style] << 2));
+	regmap_write(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG2,
+		     config->input_justification << 3);
+	regmap_write(adv7511->regmap, ADV7511_REG_TIMING_GEN_SEQ,
+		     config->sync_pulse << 2);
+
+	regmap_write(adv7511->regmap, 0xba, clock_delay << 5);
+
+	adv7511->embedded_sync = config->embedded_sync;
+	adv7511->hsync_polarity = config->hsync_polarity;
+	adv7511->vsync_polarity = config->vsync_polarity;
+	adv7511->rgb = config->input_colorspace == HDMI_COLORSPACE_RGB;
+}
+
+static void adv7511_power_on(struct adv7511 *adv7511)
+{
+	adv7511->current_edid_segment = -1;
+
+	regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
+		     ADV7511_INT0_EDID_READY);
+	regmap_write(adv7511->regmap, ADV7511_REG_INT(1),
+		     ADV7511_INT1_DDC_ERROR);
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
+			   ADV7511_POWER_POWER_DOWN, 0);
+
+	/*
+	 * Per spec it is allowed to pulse the HDP signal to indicate that the
+	 * EDID information has changed. Some monitors do this when they wakeup
+	 * from standby or are enabled. When the HDP goes low the adv7511 is
+	 * reset and the outputs are disabled which might cause the monitor to
+	 * go to standby again. To avoid this we ignore the HDP pin for the
+	 * first few seconds after enabling the output.
+	 */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
+			   ADV7511_REG_POWER2_HDP_SRC_MASK,
+			   ADV7511_REG_POWER2_HDP_SRC_NONE);
+
+	/*
+	 * Most of the registers are reset during power down or when HPD is low.
+	 */
+	regcache_sync(adv7511->regmap);
+
+	adv7511->powered = true;
+}
+
+static void adv7511_power_off(struct adv7511 *adv7511)
+{
+	/* TODO: setup additional power down modes */
+	regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
+			   ADV7511_POWER_POWER_DOWN,
+			   ADV7511_POWER_POWER_DOWN);
+	regcache_mark_dirty(adv7511->regmap);
+
+	adv7511->powered = false;
+}
+
+/* -----------------------------------------------------------------------------
+ * Interrupt and hotplug detection
+ */
+
+static bool adv7511_hpd(struct adv7511 *adv7511)
+{
+	unsigned int irq0;
+	int ret;
+
+	ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
+	if (ret < 0)
+		return false;
+
+	if (irq0 & ADV7511_INT0_HDP) {
+		regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
+			     ADV7511_INT0_HDP);
+		return true;
+	}
+
+	return false;
+}
+
+static int adv7511_irq_process(struct adv7511 *adv7511)
+{
+	unsigned int irq0, irq1;
+	int ret;
+
+	ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(1), &irq1);
+	if (ret < 0)
+		return ret;
+
+	regmap_write(adv7511->regmap, ADV7511_REG_INT(0), irq0);
+	regmap_write(adv7511->regmap, ADV7511_REG_INT(1), irq1);
+
+	if (irq0 & ADV7511_INT0_HDP)
+		drm_helper_hpd_irq_event(adv7511->encoder->dev);
+
+	if (irq0 & ADV7511_INT0_EDID_READY || irq1 & ADV7511_INT1_DDC_ERROR) {
+		adv7511->edid_read = true;
+
+		if (adv7511->i2c_main->irq)
+			wake_up_all(&adv7511->wq);
+	}
+
+	return 0;
+}
+
+static irqreturn_t adv7511_irq_handler(int irq, void *devid)
+{
+	struct adv7511 *adv7511 = devid;
+	int ret;
+
+	ret = adv7511_irq_process(adv7511);
+	return ret < 0 ? IRQ_NONE : IRQ_HANDLED;
+}
+
+/* -----------------------------------------------------------------------------
+ * EDID retrieval
+ */
+
+static int adv7511_wait_for_edid(struct adv7511 *adv7511, int timeout)
+{
+	int ret;
+
+	if (adv7511->i2c_main->irq) {
+		ret = wait_event_interruptible_timeout(adv7511->wq,
+				adv7511->edid_read, msecs_to_jiffies(timeout));
+	} else {
+		for (; timeout > 0; timeout -= 25) {
+			ret = adv7511_irq_process(adv7511);
+			if (ret < 0)
+				break;
+
+			if (adv7511->edid_read)
+				break;
+
+			msleep(25);
+		}
+	}
+
+	return adv7511->edid_read ? 0 : -EIO;
+}
+
+static int adv7511_get_edid_block(void *data, u8 *buf, unsigned int block,
+				  size_t len)
+{
+	struct adv7511 *adv7511 = data;
+	struct i2c_msg xfer[2];
+	uint8_t offset;
+	unsigned int i;
+	int ret;
+
+	if (len > 128)
+		return -EINVAL;
+
+	if (adv7511->current_edid_segment != block / 2) {
+		unsigned int status;
+
+		ret = regmap_read(adv7511->regmap, ADV7511_REG_DDC_STATUS,
+				  &status);
+		if (ret < 0)
+			return ret;
+
+		if (status != 2) {
+			adv7511->edid_read = false;
+			regmap_write(adv7511->regmap, ADV7511_REG_EDID_SEGMENT,
+				     block);
+			ret = adv7511_wait_for_edid(adv7511, 200);
+			if (ret < 0)
+				return ret;
+		}
+
+		/* Break this apart, hopefully more I2C controllers will
+		 * support 64 byte transfers than 256 byte transfers
+		 */
+
+		xfer[0].addr = adv7511->i2c_edid->addr;
+		xfer[0].flags = 0;
+		xfer[0].len = 1;
+		xfer[0].buf = &offset;
+		xfer[1].addr = adv7511->i2c_edid->addr;
+		xfer[1].flags = I2C_M_RD;
+		xfer[1].len = 64;
+		xfer[1].buf = adv7511->edid_buf;
+
+		offset = 0;
+
+		for (i = 0; i < 4; ++i) {
+			ret = i2c_transfer(adv7511->i2c_edid->adapter, xfer,
+					   ARRAY_SIZE(xfer));
+			if (ret < 0)
+				return ret;
+			else if (ret != 2)
+				return -EIO;
+
+			xfer[1].buf += 64;
+			offset += 64;
+		}
+
+		adv7511->current_edid_segment = block / 2;
+	}
+
+	if (block % 2 == 0)
+		memcpy(buf, adv7511->edid_buf, len);
+	else
+		memcpy(buf, adv7511->edid_buf + 128, len);
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Encoder operations
+ */
+
+static int adv7511_get_modes(struct drm_encoder *encoder,
+			     struct drm_connector *connector)
+{
+	struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
+	struct edid *edid;
+	unsigned int count;
+
+	/* Reading the EDID only works if the device is powered */
+	if (!adv7511->powered) {
+		regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
+			     ADV7511_INT0_EDID_READY);
+		regmap_write(adv7511->regmap, ADV7511_REG_INT(1),
+			     ADV7511_INT1_DDC_ERROR);
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
+				   ADV7511_POWER_POWER_DOWN, 0);
+		adv7511->current_edid_segment = -1;
+	}
+
+	edid = drm_do_get_edid(connector, adv7511_get_edid_block, adv7511);
+
+	if (!adv7511->powered)
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
+				   ADV7511_POWER_POWER_DOWN,
+				   ADV7511_POWER_POWER_DOWN);
+
+	kfree(adv7511->edid);
+	adv7511->edid = edid;
+	if (!edid)
+		return 0;
+
+	drm_mode_connector_update_edid_property(connector, edid);
+	count = drm_add_edid_modes(connector, edid);
+
+	adv7511_set_config_csc(adv7511, connector, adv7511->rgb);
+
+	return count;
+}
+
+static void adv7511_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+	struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
+
+	if (mode == DRM_MODE_DPMS_ON)
+		adv7511_power_on(adv7511);
+	else
+		adv7511_power_off(adv7511);
+}
+
+static enum drm_connector_status
+adv7511_encoder_detect(struct drm_encoder *encoder,
+		       struct drm_connector *connector)
+{
+	struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
+	enum drm_connector_status status;
+	unsigned int val;
+	bool hpd;
+	int ret;
+
+	ret = regmap_read(adv7511->regmap, ADV7511_REG_STATUS, &val);
+	if (ret < 0)
+		return connector_status_disconnected;
+
+	if (val & ADV7511_STATUS_HPD)
+		status = connector_status_connected;
+	else
+		status = connector_status_disconnected;
+
+	hpd = adv7511_hpd(adv7511);
+
+	/* The chip resets itself when the cable is disconnected, so in case
+	 * there is a pending HPD interrupt and the cable is connected there was
+	 * at least one transition from disconnected to connected and the chip
+	 * has to be reinitialized. */
+	if (status == connector_status_connected && hpd && adv7511->powered) {
+		regcache_mark_dirty(adv7511->regmap);
+		adv7511_power_on(adv7511);
+		adv7511_get_modes(encoder, connector);
+		if (adv7511->status == connector_status_connected)
+			status = connector_status_disconnected;
+	} else {
+		/* Renable HDP sensing */
+		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
+				   ADV7511_REG_POWER2_HDP_SRC_MASK,
+				   ADV7511_REG_POWER2_HDP_SRC_BOTH);
+	}
+
+	adv7511->status = status;
+	return status;
+}
+
+static int adv7511_encoder_mode_valid(struct drm_encoder *encoder,
+				      struct drm_display_mode *mode)
+{
+	if (mode->clock > 165000)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static void adv7511_encoder_mode_set(struct drm_encoder *encoder,
+				     struct drm_display_mode *mode,
+				     struct drm_display_mode *adj_mode)
+{
+	struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
+	unsigned int low_refresh_rate;
+	unsigned int hsync_polarity = 0;
+	unsigned int vsync_polarity = 0;
+
+	if (adv7511->embedded_sync) {
+		unsigned int hsync_offset, hsync_len;
+		unsigned int vsync_offset, vsync_len;
+
+		hsync_offset = adj_mode->crtc_hsync_start -
+			       adj_mode->crtc_hdisplay;
+		vsync_offset = adj_mode->crtc_vsync_start -
+			       adj_mode->crtc_vdisplay;
+		hsync_len = adj_mode->crtc_hsync_end -
+			    adj_mode->crtc_hsync_start;
+		vsync_len = adj_mode->crtc_vsync_end -
+			    adj_mode->crtc_vsync_start;
+
+		/* The hardware vsync generator has a off-by-one bug */
+		vsync_offset += 1;
+
+		regmap_write(adv7511->regmap, ADV7511_REG_HSYNC_PLACEMENT_MSB,
+			     ((hsync_offset >> 10) & 0x7) << 5);
+		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(0),
+			     (hsync_offset >> 2) & 0xff);
+		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(1),
+			     ((hsync_offset & 0x3) << 6) |
+			     ((hsync_len >> 4) & 0x3f));
+		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(2),
+			     ((hsync_len & 0xf) << 4) |
+			     ((vsync_offset >> 6) & 0xf));
+		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(3),
+			     ((vsync_offset & 0x3f) << 2) |
+			     ((vsync_len >> 8) & 0x3));
+		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(4),
+			     vsync_len & 0xff);
+
+		hsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PHSYNC);
+		vsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PVSYNC);
+	} else {
+		enum adv7511_sync_polarity mode_hsync_polarity;
+		enum adv7511_sync_polarity mode_vsync_polarity;
+
+		/**
+		 * If the input signal is always low or always high we want to
+		 * invert or let it passthrough depending on the polarity of the
+		 * current mode.
+		 **/
+		if (adj_mode->flags & DRM_MODE_FLAG_NHSYNC)
+			mode_hsync_polarity = ADV7511_SYNC_POLARITY_LOW;
+		else
+			mode_hsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
+
+		if (adj_mode->flags & DRM_MODE_FLAG_NVSYNC)
+			mode_vsync_polarity = ADV7511_SYNC_POLARITY_LOW;
+		else
+			mode_vsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
+
+		if (adv7511->hsync_polarity != mode_hsync_polarity &&
+		    adv7511->hsync_polarity !=
+		    ADV7511_SYNC_POLARITY_PASSTHROUGH)
+			hsync_polarity = 1;
+
+		if (adv7511->vsync_polarity != mode_vsync_polarity &&
+		    adv7511->vsync_polarity !=
+		    ADV7511_SYNC_POLARITY_PASSTHROUGH)
+			vsync_polarity = 1;
+	}
+
+	if (mode->vrefresh <= 24000)
+		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_24HZ;
+	else if (mode->vrefresh <= 25000)
+		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_25HZ;
+	else if (mode->vrefresh <= 30000)
+		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_30HZ;
+	else
+		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
+
+	regmap_update_bits(adv7511->regmap, 0xfb,
+		0x6, low_refresh_rate << 1);
+	regmap_update_bits(adv7511->regmap, 0x17,
+		0x60, (vsync_polarity << 6) | (hsync_polarity << 5));
+
+	/*
+	 * TODO Test first order 4:2:2 to 4:4:4 up conversion method, which is
+	 * supposed to give better results.
+	 */
+
+	adv7511->f_tmds = mode->clock;
+}
+
+static struct drm_encoder_slave_funcs adv7511_encoder_funcs = {
+	.dpms = adv7511_encoder_dpms,
+	.mode_valid = adv7511_encoder_mode_valid,
+	.mode_set = adv7511_encoder_mode_set,
+	.detect = adv7511_encoder_detect,
+	.get_modes = adv7511_get_modes,
+};
+
+/* -----------------------------------------------------------------------------
+ * Probe & remove
+ */
+
+static int adv7511_parse_dt(struct device_node *np,
+			    struct adv7511_link_config *config)
+{
+	const char *str;
+	int ret;
+
+	memset(config, 0, sizeof(*config));
+
+	of_property_read_u32(np, "adi,input-depth", &config->input_color_depth);
+	if (config->input_color_depth != 8 && config->input_color_depth != 10 &&
+	    config->input_color_depth != 12)
+		return -EINVAL;
+
+	ret = of_property_read_string(np, "adi,input-colorspace", &str);
+	if (ret < 0)
+		return ret;
+
+	if (!strcmp(str, "rgb"))
+		config->input_colorspace = HDMI_COLORSPACE_RGB;
+	else if (!strcmp(str, "yuv422"))
+		config->input_colorspace = HDMI_COLORSPACE_YUV422;
+	else if (!strcmp(str, "yuv444"))
+		config->input_colorspace = HDMI_COLORSPACE_YUV444;
+	else
+		return -EINVAL;
+
+	ret = of_property_read_string(np, "adi,input-clock", &str);
+	if (ret < 0)
+		return ret;
+
+	if (!strcmp(str, "1x"))
+		config->input_clock = ADV7511_INPUT_CLOCK_1X;
+	else if (!strcmp(str, "2x"))
+		config->input_clock = ADV7511_INPUT_CLOCK_2X;
+	else if (!strcmp(str, "ddr"))
+		config->input_clock = ADV7511_INPUT_CLOCK_DDR;
+	else
+		return -EINVAL;
+
+	if (config->input_colorspace == HDMI_COLORSPACE_YUV422 ||
+	    config->input_clock != ADV7511_INPUT_CLOCK_1X) {
+		ret = of_property_read_u32(np, "adi,input-style",
+					   &config->input_style);
+		if (ret)
+			return ret;
+
+		if (config->input_style < 1 || config->input_style > 3)
+			return -EINVAL;
+
+		ret = of_property_read_string(np, "adi,input-justification",
+					      &str);
+		if (ret < 0)
+			return ret;
+
+		if (!strcmp(str, "left"))
+			config->input_justification =
+				ADV7511_INPUT_JUSTIFICATION_LEFT;
+		else if (!strcmp(str, "evenly"))
+			config->input_justification =
+				ADV7511_INPUT_JUSTIFICATION_EVENLY;
+		else if (!strcmp(str, "right"))
+			config->input_justification =
+				ADV7511_INPUT_JUSTIFICATION_RIGHT;
+		else
+			return -EINVAL;
+
+	} else {
+		config->input_style = 1;
+		config->input_justification = ADV7511_INPUT_JUSTIFICATION_LEFT;
+	}
+
+	of_property_read_u32(np, "adi,clock-delay", &config->clock_delay);
+	if (config->clock_delay < -1200 || config->clock_delay > 1600)
+		return -EINVAL;
+
+	config->embedded_sync = of_property_read_bool(np, "adi,embedded-sync");
+
+	/* Hardcode the sync pulse configurations for now. */
+	config->sync_pulse = ADV7511_INPUT_SYNC_PULSE_NONE;
+	config->vsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
+	config->hsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
+
+	return 0;
+}
+
+static const int edid_i2c_addr = 0x7e;
+static const int packet_i2c_addr = 0x70;
+static const int cec_i2c_addr = 0x78;
+
+static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
+{
+	struct adv7511_link_config link_config;
+	struct adv7511 *adv7511;
+	struct device *dev = &i2c->dev;
+	unsigned int val;
+	int ret;
+
+	if (!dev->of_node)
+		return -EINVAL;
+
+	adv7511 = devm_kzalloc(dev, sizeof(*adv7511), GFP_KERNEL);
+	if (!adv7511)
+		return -ENOMEM;
+
+	adv7511->powered = false;
+	adv7511->status = connector_status_disconnected;
+
+	ret = adv7511_parse_dt(dev->of_node, &link_config);
+	if (ret)
+		return ret;
+
+	/*
+	 * The power down GPIO is optional. If present, toggle it from active to
+	 * inactive to wake up the encoder.
+	 */
+	adv7511->gpio_pd = devm_gpiod_get_optional(dev, "pd", GPIOD_OUT_HIGH);
+	if (IS_ERR(adv7511->gpio_pd))
+		return PTR_ERR(adv7511->gpio_pd);
+
+	if (adv7511->gpio_pd) {
+		mdelay(5);
+		gpiod_set_value_cansleep(adv7511->gpio_pd, 0);
+	}
+
+	adv7511->regmap = devm_regmap_init_i2c(i2c, &adv7511_regmap_config);
+	if (IS_ERR(adv7511->regmap))
+		return PTR_ERR(adv7511->regmap);
+
+	ret = regmap_read(adv7511->regmap, ADV7511_REG_CHIP_REVISION, &val);
+	if (ret)
+		return ret;
+	dev_dbg(dev, "Rev. %d\n", val);
+
+	ret = regmap_register_patch(adv7511->regmap, adv7511_fixed_registers,
+				    ARRAY_SIZE(adv7511_fixed_registers));
+	if (ret)
+		return ret;
+
+	regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR, edid_i2c_addr);
+	regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
+		     packet_i2c_addr);
+	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR, cec_i2c_addr);
+	adv7511_packet_disable(adv7511, 0xffff);
+
+	adv7511->i2c_main = i2c;
+	adv7511->i2c_edid = i2c_new_dummy(i2c->adapter, edid_i2c_addr >> 1);
+	if (!adv7511->i2c_edid)
+		return -ENOMEM;
+
+	if (i2c->irq) {
+		init_waitqueue_head(&adv7511->wq);
+
+		ret = devm_request_threaded_irq(dev, i2c->irq, NULL,
+						adv7511_irq_handler,
+						IRQF_ONESHOT, dev_name(dev),
+						adv7511);
+		if (ret)
+			goto err_i2c_unregister_device;
+	}
+
+	/* CEC is unused for now */
+	regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL,
+		     ADV7511_CEC_CTRL_POWER_DOWN);
+
+	adv7511_power_off(adv7511);
+
+	i2c_set_clientdata(i2c, adv7511);
+
+	adv7511_set_link_config(adv7511, &link_config);
+
+	return 0;
+
+err_i2c_unregister_device:
+	i2c_unregister_device(adv7511->i2c_edid);
+
+	return ret;
+}
+
+static int adv7511_remove(struct i2c_client *i2c)
+{
+	struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
+
+	i2c_unregister_device(adv7511->i2c_edid);
+
+	kfree(adv7511->edid);
+
+	return 0;
+}
+
+static int adv7511_encoder_init(struct i2c_client *i2c, struct drm_device *dev,
+				struct drm_encoder_slave *encoder)
+{
+
+	struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
+
+	encoder->slave_priv = adv7511;
+	encoder->slave_funcs = &adv7511_encoder_funcs;
+
+	adv7511->encoder = &encoder->base;
+
+	return 0;
+}
+
+static const struct i2c_device_id adv7511_i2c_ids[] = {
+	{ "adv7511", 0 },
+	{ "adv7511w", 0 },
+	{ "adv7513", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, adv7511_i2c_ids);
+
+static const struct of_device_id adv7511_of_ids[] = {
+	{ .compatible = "adi,adv7511", },
+	{ .compatible = "adi,adv7511w", },
+	{ .compatible = "adi,adv7513", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, adv7511_of_ids);
+
+static struct drm_i2c_encoder_driver adv7511_driver = {
+	.i2c_driver = {
+		.driver = {
+			.name = "adv7511",
+			.of_match_table = adv7511_of_ids,
+		},
+		.id_table = adv7511_i2c_ids,
+		.probe = adv7511_probe,
+		.remove = adv7511_remove,
+	},
+
+	.encoder_init = adv7511_encoder_init,
+};
+
+static int __init adv7511_init(void)
+{
+	return drm_i2c_encoder_register(THIS_MODULE, &adv7511_driver);
+}
+module_init(adv7511_init);
+
+static void __exit adv7511_exit(void)
+{
+	drm_i2c_encoder_unregister(&adv7511_driver);
+}
+module_exit(adv7511_exit);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("ADV7511 HDMI transmitter driver");
+MODULE_LICENSE("GPL");