drivers/gpu/drm/i915/display/dvo_ch7017.c - third_party/kernel - Git at Google

 /*
  * Copyright © 2006 Intel Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  *
  * Authors:
  *    Eric Anholt <eric@anholt.net>
  *
  */

 #include "intel_display_types.h"
 #include "intel_dvo_dev.h"

 #define CH7017_TV_DISPLAY_MODE		0x00
 #define CH7017_FLICKER_FILTER		0x01
 #define CH7017_VIDEO_BANDWIDTH		0x02
 #define CH7017_TEXT_ENHANCEMENT		0x03
 #define CH7017_START_ACTIVE_VIDEO	0x04
 #define CH7017_HORIZONTAL_POSITION	0x05
 #define CH7017_VERTICAL_POSITION	0x06
 #define CH7017_BLACK_LEVEL		0x07
 #define CH7017_CONTRAST_ENHANCEMENT	0x08
 #define CH7017_TV_PLL			0x09
 #define CH7017_TV_PLL_M			0x0a
 #define CH7017_TV_PLL_N			0x0b
 #define CH7017_SUB_CARRIER_0		0x0c
 #define CH7017_CIV_CONTROL		0x10
 #define CH7017_CIV_0			0x11
 #define CH7017_CHROMA_BOOST		0x14
 #define CH7017_CLOCK_MODE		0x1c
 #define CH7017_INPUT_CLOCK		0x1d
 #define CH7017_GPIO_CONTROL		0x1e
 #define CH7017_INPUT_DATA_FORMAT	0x1f
 #define CH7017_CONNECTION_DETECT	0x20
 #define CH7017_DAC_CONTROL		0x21
 #define CH7017_BUFFERED_CLOCK_OUTPUT	0x22
 #define CH7017_DEFEAT_VSYNC		0x47
 #define CH7017_TEST_PATTERN		0x48

 #define CH7017_POWER_MANAGEMENT		0x49
 /** Enables the TV output path. */
 #define CH7017_TV_EN			(1 << 0)
 #define CH7017_DAC0_POWER_DOWN		(1 << 1)
 #define CH7017_DAC1_POWER_DOWN		(1 << 2)
 #define CH7017_DAC2_POWER_DOWN		(1 << 3)
 #define CH7017_DAC3_POWER_DOWN		(1 << 4)
 /** Powers down the TV out block, and DAC0-3 */
 #define CH7017_TV_POWER_DOWN_EN		(1 << 5)

 #define CH7017_VERSION_ID		0x4a

 #define CH7017_DEVICE_ID		0x4b
 #define CH7017_DEVICE_ID_VALUE		0x1b
 #define CH7018_DEVICE_ID_VALUE		0x1a
 #define CH7019_DEVICE_ID_VALUE		0x19

 #define CH7017_XCLK_D2_ADJUST		0x53
 #define CH7017_UP_SCALER_COEFF_0	0x55
 #define CH7017_UP_SCALER_COEFF_1	0x56
 #define CH7017_UP_SCALER_COEFF_2	0x57
 #define CH7017_UP_SCALER_COEFF_3	0x58
 #define CH7017_UP_SCALER_COEFF_4	0x59
 #define CH7017_UP_SCALER_VERTICAL_INC_0	0x5a
 #define CH7017_UP_SCALER_VERTICAL_INC_1	0x5b
 #define CH7017_GPIO_INVERT		0x5c
 #define CH7017_UP_SCALER_HORIZONTAL_INC_0	0x5d
 #define CH7017_UP_SCALER_HORIZONTAL_INC_1	0x5e

 #define CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT	0x5f
 /**< Low bits of horizontal active pixel input */

 #define CH7017_ACTIVE_INPUT_LINE_OUTPUT	0x60
 /** High bits of horizontal active pixel input */
 #define CH7017_LVDS_HAP_INPUT_MASK	(0x7 << 0)
 /** High bits of vertical active line output */
 #define CH7017_LVDS_VAL_HIGH_MASK	(0x7 << 3)

 #define CH7017_VERTICAL_ACTIVE_LINE_OUTPUT	0x61
 /**< Low bits of vertical active line output */

 #define CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT	0x62
 /**< Low bits of horizontal active pixel output */

 #define CH7017_LVDS_POWER_DOWN		0x63
 /** High bits of horizontal active pixel output */
 #define CH7017_LVDS_HAP_HIGH_MASK	(0x7 << 0)
 /** Enables the LVDS power down state transition */
 #define CH7017_LVDS_POWER_DOWN_EN	(1 << 6)
 /** Enables the LVDS upscaler */
 #define CH7017_LVDS_UPSCALER_EN		(1 << 7)
 #define CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED 0x08

 #define CH7017_LVDS_ENCODING		0x64
 #define CH7017_LVDS_DITHER_2D		(1 << 2)
 #define CH7017_LVDS_DITHER_DIS		(1 << 3)
 #define CH7017_LVDS_DUAL_CHANNEL_EN	(1 << 4)
 #define CH7017_LVDS_24_BIT		(1 << 5)

 #define CH7017_LVDS_ENCODING_2		0x65

 #define CH7017_LVDS_PLL_CONTROL		0x66
 /** Enables the LVDS panel output path */
 #define CH7017_LVDS_PANEN		(1 << 0)
 /** Enables the LVDS panel backlight */
 #define CH7017_LVDS_BKLEN		(1 << 3)

 #define CH7017_POWER_SEQUENCING_T1	0x67
 #define CH7017_POWER_SEQUENCING_T2	0x68
 #define CH7017_POWER_SEQUENCING_T3	0x69
 #define CH7017_POWER_SEQUENCING_T4	0x6a
 #define CH7017_POWER_SEQUENCING_T5	0x6b
 #define CH7017_GPIO_DRIVER_TYPE		0x6c
 #define CH7017_GPIO_DATA		0x6d
 #define CH7017_GPIO_DIRECTION_CONTROL	0x6e

 #define CH7017_LVDS_PLL_FEEDBACK_DIV	0x71
 # define CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT 4
 # define CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT 0
 # define CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED 0x80

 #define CH7017_LVDS_PLL_VCO_CONTROL	0x72
 # define CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED 0x80
 # define CH7017_LVDS_PLL_VCO_SHIFT	4
 # define CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT 0

 #define CH7017_OUTPUTS_ENABLE		0x73
 # define CH7017_CHARGE_PUMP_LOW		0x0
 # define CH7017_CHARGE_PUMP_HIGH	0x3
 # define CH7017_LVDS_CHANNEL_A		(1 << 3)
 # define CH7017_LVDS_CHANNEL_B		(1 << 4)
 # define CH7017_TV_DAC_A		(1 << 5)
 # define CH7017_TV_DAC_B		(1 << 6)
 # define CH7017_DDC_SELECT_DC2		(1 << 7)

 #define CH7017_LVDS_OUTPUT_AMPLITUDE	0x74
 #define CH7017_LVDS_PLL_EMI_REDUCTION	0x75
 #define CH7017_LVDS_POWER_DOWN_FLICKER	0x76

 #define CH7017_LVDS_CONTROL_2		0x78
 # define CH7017_LOOP_FILTER_SHIFT	5
 # define CH7017_PHASE_DETECTOR_SHIFT	0

 #define CH7017_BANG_LIMIT_CONTROL	0x7f

 struct ch7017_priv {
 	u8 dummy;
 };

 static void ch7017_dump_regs(struct intel_dvo_device *dvo);
 static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable);

 static bool ch7017_read(struct intel_dvo_device *dvo, u8 addr, u8 *val)
 {
 	struct i2c_msg msgs[] = {
 		{
 			.addr = dvo->slave_addr,
 			.flags = 0,
 			.len = 1,
 			.buf = &addr,
 		},
 		{
 			.addr = dvo->slave_addr,
 			.flags = I2C_M_RD,
 			.len = 1,
 			.buf = val,
 		}
 	};
 	return i2c_transfer(dvo->i2c_bus, msgs, 2) == 2;
 }

 static bool ch7017_write(struct intel_dvo_device *dvo, u8 addr, u8 val)
 {
 	u8 buf[2] = { addr, val };
 	struct i2c_msg msg = {
 		.addr = dvo->slave_addr,
 		.flags = 0,
 		.len = 2,
 		.buf = buf,
 	};
 	return i2c_transfer(dvo->i2c_bus, &msg, 1) == 1;
 }

 /** Probes for a CH7017 on the given bus and slave address. */
 static bool ch7017_init(struct intel_dvo_device *dvo,
 			struct i2c_adapter *adapter)
 {
 	struct ch7017_priv *priv;
 	const char *str;
 	u8 val;

 	priv = kzalloc(sizeof(struct ch7017_priv), GFP_KERNEL);
 	if (priv == NULL)
 		return false;

 	dvo->i2c_bus = adapter;
 	dvo->dev_priv = priv;

 	if (!ch7017_read(dvo, CH7017_DEVICE_ID, &val))
 		goto fail;

 	switch (val) {
 	case CH7017_DEVICE_ID_VALUE:
 		str = "ch7017";
 		break;
 	case CH7018_DEVICE_ID_VALUE:
 		str = "ch7018";
 		break;
 	case CH7019_DEVICE_ID_VALUE:
 		str = "ch7019";
 		break;
 	default:
 		DRM_DEBUG_KMS("ch701x not detected, got %d: from %s "
 			      "slave %d.\n",
 			      val, adapter->name, dvo->slave_addr);
 		goto fail;
 	}

 	DRM_DEBUG_KMS("%s detected on %s, addr %d\n",
 		      str, adapter->name, dvo->slave_addr);
 	return true;

 fail:
 	kfree(priv);
 	return false;
 }

 static enum drm_connector_status ch7017_detect(struct intel_dvo_device *dvo)
 {
 	return connector_status_connected;
 }

 static enum drm_mode_status ch7017_mode_valid(struct intel_dvo_device *dvo,
 					      struct drm_display_mode *mode)
 {
 	if (mode->clock > 160000)
 		return MODE_CLOCK_HIGH;

 	return MODE_OK;
 }

 static void ch7017_mode_set(struct intel_dvo_device *dvo,
 			    const struct drm_display_mode *mode,
 			    const struct drm_display_mode *adjusted_mode)
 {
 	u8 lvds_pll_feedback_div, lvds_pll_vco_control;
 	u8 outputs_enable, lvds_control_2, lvds_power_down;
 	u8 horizontal_active_pixel_input;
 	u8 horizontal_active_pixel_output, vertical_active_line_output;
 	u8 active_input_line_output;

 	DRM_DEBUG_KMS("Registers before mode setting\n");
 	ch7017_dump_regs(dvo);

 	/* LVDS PLL settings from page 75 of 7017-7017ds.pdf*/
 	if (mode->clock < 100000) {
 		outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_LOW;
 		lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
 			(2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
 			(13 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
 		lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 			(2 << CH7017_LVDS_PLL_VCO_SHIFT) |
 			(3 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 		lvds_control_2 = (1 << CH7017_LOOP_FILTER_SHIFT) |
 			(0 << CH7017_PHASE_DETECTOR_SHIFT);
 	} else {
 		outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_HIGH;
 		lvds_pll_feedback_div =
 			CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
 			(2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
 			(3 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
 		lvds_control_2 = (3 << CH7017_LOOP_FILTER_SHIFT) |
 			(0 << CH7017_PHASE_DETECTOR_SHIFT);
 		if (1) { /* XXX: dual channel panel detection.  Assume yes for now. */
 			outputs_enable |= CH7017_LVDS_CHANNEL_B;
 			lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 				(2 << CH7017_LVDS_PLL_VCO_SHIFT) |
 				(13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 		} else {
 			lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
 				(1 << CH7017_LVDS_PLL_VCO_SHIFT) |
 				(13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
 		}
 	}

 	horizontal_active_pixel_input = mode->hdisplay & 0x00ff;

 	vertical_active_line_output = mode->vdisplay & 0x00ff;
 	horizontal_active_pixel_output = mode->hdisplay & 0x00ff;

 	active_input_line_output = ((mode->hdisplay & 0x0700) >> 8) |
 				   (((mode->vdisplay & 0x0700) >> 8) << 3);

 	lvds_power_down = CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED |
 			  (mode->hdisplay & 0x0700) >> 8;

 	ch7017_dpms(dvo, false);
 	ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT,
 			horizontal_active_pixel_input);
 	ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT,
 			horizontal_active_pixel_output);
 	ch7017_write(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT,
 			vertical_active_line_output);
 	ch7017_write(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT,
 			active_input_line_output);
 	ch7017_write(dvo, CH7017_LVDS_PLL_VCO_CONTROL, lvds_pll_vco_control);
 	ch7017_write(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, lvds_pll_feedback_div);
 	ch7017_write(dvo, CH7017_LVDS_CONTROL_2, lvds_control_2);
 	ch7017_write(dvo, CH7017_OUTPUTS_ENABLE, outputs_enable);

 	/* Turn the LVDS back on with new settings. */
 	ch7017_write(dvo, CH7017_LVDS_POWER_DOWN, lvds_power_down);

 	DRM_DEBUG_KMS("Registers after mode setting\n");
 	ch7017_dump_regs(dvo);
 }

 /* set the CH7017 power state */
 static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable)
 {
 	u8 val;

 	ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

 	/* Turn off TV/VGA, and never turn it on since we don't support it. */
 	ch7017_write(dvo, CH7017_POWER_MANAGEMENT,
 			CH7017_DAC0_POWER_DOWN |
 			CH7017_DAC1_POWER_DOWN |
 			CH7017_DAC2_POWER_DOWN |
 			CH7017_DAC3_POWER_DOWN |
 			CH7017_TV_POWER_DOWN_EN);

 	if (enable) {
 		/* Turn on the LVDS */
 		ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
 			     val & ~CH7017_LVDS_POWER_DOWN_EN);
 	} else {
 		/* Turn off the LVDS */
 		ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
 			     val | CH7017_LVDS_POWER_DOWN_EN);
 	}

 	/* XXX: Should actually wait for update power status somehow */
 	msleep(20);
 }

 static bool ch7017_get_hw_state(struct intel_dvo_device *dvo)
 {
 	u8 val;

 	ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

 	if (val & CH7017_LVDS_POWER_DOWN_EN)
 		return false;
 	else
 		return true;
 }

 static void ch7017_dump_regs(struct intel_dvo_device *dvo)
 {
 	u8 val;

 #define DUMP(reg)					\
 do {							\
 	ch7017_read(dvo, reg, &val);			\
 	DRM_DEBUG_KMS(#reg ": %02x\n", val);		\
 } while (0)

 	DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT);
 	DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT);
 	DUMP(CH7017_VERTICAL_ACTIVE_LINE_OUTPUT);
 	DUMP(CH7017_ACTIVE_INPUT_LINE_OUTPUT);
 	DUMP(CH7017_LVDS_PLL_VCO_CONTROL);
 	DUMP(CH7017_LVDS_PLL_FEEDBACK_DIV);
 	DUMP(CH7017_LVDS_CONTROL_2);
 	DUMP(CH7017_OUTPUTS_ENABLE);
 	DUMP(CH7017_LVDS_POWER_DOWN);
 }

 static void ch7017_destroy(struct intel_dvo_device *dvo)
 {
 	struct ch7017_priv *priv = dvo->dev_priv;

 	if (priv) {
 		kfree(priv);
 		dvo->dev_priv = NULL;
 	}
 }

 const struct intel_dvo_dev_ops ch7017_ops = {
 	.init = ch7017_init,
 	.detect = ch7017_detect,
 	.mode_valid = ch7017_mode_valid,
 	.mode_set = ch7017_mode_set,
 	.dpms = ch7017_dpms,
 	.get_hw_state = ch7017_get_hw_state,
 	.dump_regs = ch7017_dump_regs,
 	.destroy = ch7017_destroy,
 };
	/*
	* Copyright © 2006 Intel Corporation
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	* DEALINGS IN THE SOFTWARE.
	*
	* Authors:
	* Eric Anholt <eric@anholt.net>
	*
	*/

	#include "intel_display_types.h"
	#include "intel_dvo_dev.h"

	#define CH7017_TV_DISPLAY_MODE 0x00
	#define CH7017_FLICKER_FILTER 0x01
	#define CH7017_VIDEO_BANDWIDTH 0x02
	#define CH7017_TEXT_ENHANCEMENT 0x03
	#define CH7017_START_ACTIVE_VIDEO 0x04
	#define CH7017_HORIZONTAL_POSITION 0x05
	#define CH7017_VERTICAL_POSITION 0x06
	#define CH7017_BLACK_LEVEL 0x07
	#define CH7017_CONTRAST_ENHANCEMENT 0x08
	#define CH7017_TV_PLL 0x09
	#define CH7017_TV_PLL_M 0x0a
	#define CH7017_TV_PLL_N 0x0b
	#define CH7017_SUB_CARRIER_0 0x0c
	#define CH7017_CIV_CONTROL 0x10
	#define CH7017_CIV_0 0x11
	#define CH7017_CHROMA_BOOST 0x14
	#define CH7017_CLOCK_MODE 0x1c
	#define CH7017_INPUT_CLOCK 0x1d
	#define CH7017_GPIO_CONTROL 0x1e
	#define CH7017_INPUT_DATA_FORMAT 0x1f
	#define CH7017_CONNECTION_DETECT 0x20
	#define CH7017_DAC_CONTROL 0x21
	#define CH7017_BUFFERED_CLOCK_OUTPUT 0x22
	#define CH7017_DEFEAT_VSYNC 0x47
	#define CH7017_TEST_PATTERN 0x48

	#define CH7017_POWER_MANAGEMENT 0x49
	/** Enables the TV output path. */
	#define CH7017_TV_EN (1 << 0)
	#define CH7017_DAC0_POWER_DOWN (1 << 1)
	#define CH7017_DAC1_POWER_DOWN (1 << 2)
	#define CH7017_DAC2_POWER_DOWN (1 << 3)
	#define CH7017_DAC3_POWER_DOWN (1 << 4)
	/** Powers down the TV out block, and DAC0-3 */
	#define CH7017_TV_POWER_DOWN_EN (1 << 5)

	#define CH7017_VERSION_ID 0x4a

	#define CH7017_DEVICE_ID 0x4b
	#define CH7017_DEVICE_ID_VALUE 0x1b
	#define CH7018_DEVICE_ID_VALUE 0x1a
	#define CH7019_DEVICE_ID_VALUE 0x19

	#define CH7017_XCLK_D2_ADJUST 0x53
	#define CH7017_UP_SCALER_COEFF_0 0x55
	#define CH7017_UP_SCALER_COEFF_1 0x56
	#define CH7017_UP_SCALER_COEFF_2 0x57
	#define CH7017_UP_SCALER_COEFF_3 0x58
	#define CH7017_UP_SCALER_COEFF_4 0x59
	#define CH7017_UP_SCALER_VERTICAL_INC_0 0x5a
	#define CH7017_UP_SCALER_VERTICAL_INC_1 0x5b
	#define CH7017_GPIO_INVERT 0x5c
	#define CH7017_UP_SCALER_HORIZONTAL_INC_0 0x5d
	#define CH7017_UP_SCALER_HORIZONTAL_INC_1 0x5e

	#define CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT 0x5f
	/*< Low bits of horizontal active pixel input /

	#define CH7017_ACTIVE_INPUT_LINE_OUTPUT 0x60
	/** High bits of horizontal active pixel input */
	#define CH7017_LVDS_HAP_INPUT_MASK (0x7 << 0)
	/** High bits of vertical active line output */
	#define CH7017_LVDS_VAL_HIGH_MASK (0x7 << 3)

	#define CH7017_VERTICAL_ACTIVE_LINE_OUTPUT 0x61
	/*< Low bits of vertical active line output /

	#define CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT 0x62
	/*< Low bits of horizontal active pixel output /

	#define CH7017_LVDS_POWER_DOWN 0x63
	/** High bits of horizontal active pixel output */
	#define CH7017_LVDS_HAP_HIGH_MASK (0x7 << 0)
	/** Enables the LVDS power down state transition */
	#define CH7017_LVDS_POWER_DOWN_EN (1 << 6)
	/** Enables the LVDS upscaler */
	#define CH7017_LVDS_UPSCALER_EN (1 << 7)
	#define CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED 0x08

	#define CH7017_LVDS_ENCODING 0x64
	#define CH7017_LVDS_DITHER_2D (1 << 2)
	#define CH7017_LVDS_DITHER_DIS (1 << 3)
	#define CH7017_LVDS_DUAL_CHANNEL_EN (1 << 4)
	#define CH7017_LVDS_24_BIT (1 << 5)

	#define CH7017_LVDS_ENCODING_2 0x65

	#define CH7017_LVDS_PLL_CONTROL 0x66
	/** Enables the LVDS panel output path */
	#define CH7017_LVDS_PANEN (1 << 0)
	/** Enables the LVDS panel backlight */
	#define CH7017_LVDS_BKLEN (1 << 3)

	#define CH7017_POWER_SEQUENCING_T1 0x67
	#define CH7017_POWER_SEQUENCING_T2 0x68
	#define CH7017_POWER_SEQUENCING_T3 0x69
	#define CH7017_POWER_SEQUENCING_T4 0x6a
	#define CH7017_POWER_SEQUENCING_T5 0x6b
	#define CH7017_GPIO_DRIVER_TYPE 0x6c
	#define CH7017_GPIO_DATA 0x6d
	#define CH7017_GPIO_DIRECTION_CONTROL 0x6e

	#define CH7017_LVDS_PLL_FEEDBACK_DIV 0x71
	# define CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT 4
	# define CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT 0
	# define CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED 0x80

	#define CH7017_LVDS_PLL_VCO_CONTROL 0x72
	# define CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED 0x80
	# define CH7017_LVDS_PLL_VCO_SHIFT 4
	# define CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT 0

	#define CH7017_OUTPUTS_ENABLE 0x73
	# define CH7017_CHARGE_PUMP_LOW 0x0
	# define CH7017_CHARGE_PUMP_HIGH 0x3
	# define CH7017_LVDS_CHANNEL_A (1 << 3)
	# define CH7017_LVDS_CHANNEL_B (1 << 4)
	# define CH7017_TV_DAC_A (1 << 5)
	# define CH7017_TV_DAC_B (1 << 6)
	# define CH7017_DDC_SELECT_DC2 (1 << 7)

	#define CH7017_LVDS_OUTPUT_AMPLITUDE 0x74
	#define CH7017_LVDS_PLL_EMI_REDUCTION 0x75
	#define CH7017_LVDS_POWER_DOWN_FLICKER 0x76

	#define CH7017_LVDS_CONTROL_2 0x78
	# define CH7017_LOOP_FILTER_SHIFT 5
	# define CH7017_PHASE_DETECTOR_SHIFT 0

	#define CH7017_BANG_LIMIT_CONTROL 0x7f

	struct ch7017_priv {
	u8 dummy;
	};

	static void ch7017_dump_regs(struct intel_dvo_device *dvo);
	static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable);

	static bool ch7017_read(struct intel_dvo_device dvo, u8 addr, u8 val)
	{
	struct i2c_msg msgs[] = {
	{
	.addr = dvo->slave_addr,
	.flags = 0,
	.len = 1,
	.buf = &addr,
	},
	{
	.addr = dvo->slave_addr,
	.flags = I2C_M_RD,
	.len = 1,
	.buf = val,
	}
	};
	return i2c_transfer(dvo->i2c_bus, msgs, 2) == 2;
	}

	static bool ch7017_write(struct intel_dvo_device *dvo, u8 addr, u8 val)
	{
	u8 buf[2] = { addr, val };
	struct i2c_msg msg = {
	.addr = dvo->slave_addr,
	.flags = 0,
	.len = 2,
	.buf = buf,
	};
	return i2c_transfer(dvo->i2c_bus, &msg, 1) == 1;
	}

	/** Probes for a CH7017 on the given bus and slave address. */
	static bool ch7017_init(struct intel_dvo_device *dvo,
	struct i2c_adapter *adapter)
	{
	struct ch7017_priv *priv;
	const char *str;
	u8 val;

	priv = kzalloc(sizeof(struct ch7017_priv), GFP_KERNEL);
	if (priv == NULL)
	return false;

	dvo->i2c_bus = adapter;
	dvo->dev_priv = priv;

	if (!ch7017_read(dvo, CH7017_DEVICE_ID, &val))
	goto fail;

	switch (val) {
	case CH7017_DEVICE_ID_VALUE:
	str = "ch7017";
	break;
	case CH7018_DEVICE_ID_VALUE:
	str = "ch7018";
	break;
	case CH7019_DEVICE_ID_VALUE:
	str = "ch7019";
	break;
	default:
	DRM_DEBUG_KMS("ch701x not detected, got %d: from %s "
	"slave %d.\n",
	val, adapter->name, dvo->slave_addr);
	goto fail;
	}

	DRM_DEBUG_KMS("%s detected on %s, addr %d\n",
	str, adapter->name, dvo->slave_addr);
	return true;

	fail:
	kfree(priv);
	return false;
	}

	static enum drm_connector_status ch7017_detect(struct intel_dvo_device *dvo)
	{
	return connector_status_connected;
	}

	static enum drm_mode_status ch7017_mode_valid(struct intel_dvo_device *dvo,
	struct drm_display_mode *mode)
	{
	if (mode->clock > 160000)
	return MODE_CLOCK_HIGH;

	return MODE_OK;
	}

	static void ch7017_mode_set(struct intel_dvo_device *dvo,
	const struct drm_display_mode *mode,
	const struct drm_display_mode *adjusted_mode)
	{
	u8 lvds_pll_feedback_div, lvds_pll_vco_control;
	u8 outputs_enable, lvds_control_2, lvds_power_down;
	u8 horizontal_active_pixel_input;
	u8 horizontal_active_pixel_output, vertical_active_line_output;
	u8 active_input_line_output;

	DRM_DEBUG_KMS("Registers before mode setting\n");
	ch7017_dump_regs(dvo);

	/* LVDS PLL settings from page 75 of 7017-7017ds.pdf*/
	if (mode->clock < 100000) {
	outputs_enable = CH7017_LVDS_CHANNEL_A \| CH7017_CHARGE_PUMP_LOW;
	lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED \|
	(2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) \|
	(13 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
	lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED \|
	(2 << CH7017_LVDS_PLL_VCO_SHIFT) \|
	(3 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
	lvds_control_2 = (1 << CH7017_LOOP_FILTER_SHIFT) \|
	(0 << CH7017_PHASE_DETECTOR_SHIFT);
	} else {
	outputs_enable = CH7017_LVDS_CHANNEL_A \| CH7017_CHARGE_PUMP_HIGH;
	lvds_pll_feedback_div =
	CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED \|
	(2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) \|
	(3 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
	lvds_control_2 = (3 << CH7017_LOOP_FILTER_SHIFT) \|
	(0 << CH7017_PHASE_DETECTOR_SHIFT);
	if (1) { /* XXX: dual channel panel detection. Assume yes for now. */
	outputs_enable \|= CH7017_LVDS_CHANNEL_B;
	lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED \|
	(2 << CH7017_LVDS_PLL_VCO_SHIFT) \|
	(13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
	} else {
	lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED \|
	(1 << CH7017_LVDS_PLL_VCO_SHIFT) \|
	(13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
	}
	}

	horizontal_active_pixel_input = mode->hdisplay & 0x00ff;

	vertical_active_line_output = mode->vdisplay & 0x00ff;
	horizontal_active_pixel_output = mode->hdisplay & 0x00ff;

	active_input_line_output = ((mode->hdisplay & 0x0700) >> 8) \|
	(((mode->vdisplay & 0x0700) >> 8) << 3);

	lvds_power_down = CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED \|
	(mode->hdisplay & 0x0700) >> 8;

	ch7017_dpms(dvo, false);
	ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT,
	horizontal_active_pixel_input);
	ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT,
	horizontal_active_pixel_output);
	ch7017_write(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT,
	vertical_active_line_output);
	ch7017_write(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT,
	active_input_line_output);
	ch7017_write(dvo, CH7017_LVDS_PLL_VCO_CONTROL, lvds_pll_vco_control);
	ch7017_write(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, lvds_pll_feedback_div);
	ch7017_write(dvo, CH7017_LVDS_CONTROL_2, lvds_control_2);
	ch7017_write(dvo, CH7017_OUTPUTS_ENABLE, outputs_enable);

	/* Turn the LVDS back on with new settings. */
	ch7017_write(dvo, CH7017_LVDS_POWER_DOWN, lvds_power_down);

	DRM_DEBUG_KMS("Registers after mode setting\n");
	ch7017_dump_regs(dvo);
	}

	/* set the CH7017 power state */
	static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable)
	{
	u8 val;

	ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

	/* Turn off TV/VGA, and never turn it on since we don't support it. */
	ch7017_write(dvo, CH7017_POWER_MANAGEMENT,
	CH7017_DAC0_POWER_DOWN \|
	CH7017_DAC1_POWER_DOWN \|
	CH7017_DAC2_POWER_DOWN \|
	CH7017_DAC3_POWER_DOWN \|
	CH7017_TV_POWER_DOWN_EN);

	if (enable) {
	/* Turn on the LVDS */
	ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
	val & ~CH7017_LVDS_POWER_DOWN_EN);
	} else {
	/* Turn off the LVDS */
	ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
	val \| CH7017_LVDS_POWER_DOWN_EN);
	}

	/* XXX: Should actually wait for update power status somehow */
	msleep(20);
	}

	static bool ch7017_get_hw_state(struct intel_dvo_device *dvo)
	{
	u8 val;

	ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

	if (val & CH7017_LVDS_POWER_DOWN_EN)
	return false;
	else
	return true;
	}

	static void ch7017_dump_regs(struct intel_dvo_device *dvo)
	{
	u8 val;

	#define DUMP(reg) \
	do { \
	ch7017_read(dvo, reg, &val); \
	DRM_DEBUG_KMS(#reg ": %02x\n", val); \
	} while (0)

	DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT);
	DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT);
	DUMP(CH7017_VERTICAL_ACTIVE_LINE_OUTPUT);
	DUMP(CH7017_ACTIVE_INPUT_LINE_OUTPUT);
	DUMP(CH7017_LVDS_PLL_VCO_CONTROL);
	DUMP(CH7017_LVDS_PLL_FEEDBACK_DIV);
	DUMP(CH7017_LVDS_CONTROL_2);
	DUMP(CH7017_OUTPUTS_ENABLE);
	DUMP(CH7017_LVDS_POWER_DOWN);
	}

	static void ch7017_destroy(struct intel_dvo_device *dvo)
	{
	struct ch7017_priv *priv = dvo->dev_priv;

	if (priv) {
	kfree(priv);
	dvo->dev_priv = NULL;
	}
	}

	const struct intel_dvo_dev_ops ch7017_ops = {
	.init = ch7017_init,
	.detect = ch7017_detect,
	.mode_valid = ch7017_mode_valid,
	.mode_set = ch7017_mode_set,
	.dpms = ch7017_dpms,
	.get_hw_state = ch7017_get_hw_state,
	.dump_regs = ch7017_dump_regs,
	.destroy = ch7017_destroy,
	};