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/*

 * Copyright © 2008 Keith Packard

 *

 * Permission to use, copy, modify, distribute, and sell this software and its

 * documentation for any purpose is hereby granted without fee, provided that

 * the above copyright notice appear in all copies and that both that copyright

 * notice and this permission notice appear in supporting documentation, and

 * that the name of the copyright holders not be used in advertising or

 * publicity pertaining to distribution of the software without specific,

 * written prior permission.  The copyright holders make no representations

 * about the suitability of this software for any purpose.  It is provided "as

 * is" without express or implied warranty.

 *

 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO

 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR

 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,

 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

 * OF THIS SOFTWARE.

 */

#ifndef _DRM_DP_HELPER_H_

#define _DRM_DP_HELPER_H_

#include 

#include 

#include 

/*

 * Unless otherwise noted, all values are from the DP 1.1a spec.  Note that

 * DP and DPCD versions are independent.  Differences from 1.0 are not noted,

 * 1.0 devices basically don't exist in the wild.

 *

 * Abbreviations, in chronological order:

 *

 * eDP: Embedded DisplayPort version 1

 * DPI: DisplayPort Interoperability Guideline v1.1a

 * 1.2: DisplayPort 1.2

 * MST: Multistream Transport - part of DP 1.2a

 *

 * 1.2 formally includes both eDP and DPI definitions.

 */

#define DP_AUX_I2C_WRITE		0x0

#define DP_AUX_I2C_READ			0x1

#define DP_AUX_I2C_STATUS		0x2

#define DP_AUX_I2C_MOT			0x4

#define DP_AUX_NATIVE_WRITE		0x8

#define DP_AUX_NATIVE_READ		0x9

#define DP_AUX_NATIVE_REPLY_ACK		(0x0 << 0)

#define DP_AUX_NATIVE_REPLY_NACK	(0x1 << 0)

#define DP_AUX_NATIVE_REPLY_DEFER	(0x2 << 0)

#define DP_AUX_NATIVE_REPLY_MASK	(0x3 << 0)

#define DP_AUX_I2C_REPLY_ACK		(0x0 << 2)

#define DP_AUX_I2C_REPLY_NACK		(0x1 << 2)

#define DP_AUX_I2C_REPLY_DEFER		(0x2 << 2)

#define DP_AUX_I2C_REPLY_MASK		(0x3 << 2)

/* AUX CH addresses */

/* DPCD */

#define DP_DPCD_REV                         0x000

#define DP_MAX_LINK_RATE                    0x001

#define DP_MAX_LANE_COUNT                   0x002

# define DP_MAX_LANE_COUNT_MASK		    0x1f

# define DP_TPS3_SUPPORTED		    (1 << 6) /* 1.2 */

# define DP_ENHANCED_FRAME_CAP		    (1 << 7)

#define DP_MAX_DOWNSPREAD                   0x003

# define DP_NO_AUX_HANDSHAKE_LINK_TRAINING  (1 << 6)

#define DP_NORP                             0x004

#define DP_DOWNSTREAMPORT_PRESENT           0x005

# define DP_DWN_STRM_PORT_PRESENT           (1 << 0)

# define DP_DWN_STRM_PORT_TYPE_MASK         0x06

# define DP_DWN_STRM_PORT_TYPE_DP           (0 << 1)

# define DP_DWN_STRM_PORT_TYPE_ANALOG       (1 << 1)

# define DP_DWN_STRM_PORT_TYPE_TMDS         (2 << 1)

# define DP_DWN_STRM_PORT_TYPE_OTHER        (3 << 1)

# define DP_FORMAT_CONVERSION               (1 << 3)

# define DP_DETAILED_CAP_INFO_AVAILABLE	    (1 << 4) /* DPI */

#define DP_MAIN_LINK_CHANNEL_CODING         0x006

#define DP_DOWN_STREAM_PORT_COUNT	    0x007

# define DP_PORT_COUNT_MASK		    0x0f

# define DP_MSA_TIMING_PAR_IGNORED	    (1 << 6) /* eDP */

# define DP_OUI_SUPPORT			    (1 << 7)

#define DP_I2C_SPEED_CAP		    0x00c    /* DPI */

# define DP_I2C_SPEED_1K		    0x01

# define DP_I2C_SPEED_5K		    0x02

# define DP_I2C_SPEED_10K		    0x04

# define DP_I2C_SPEED_100K		    0x08

# define DP_I2C_SPEED_400K		    0x10

# define DP_I2C_SPEED_1M		    0x20

#define DP_EDP_CONFIGURATION_CAP            0x00d   /* XXX 1.2? */

#define DP_TRAINING_AUX_RD_INTERVAL         0x00e   /* XXX 1.2? */

/* Multiple stream transport */

#define DP_FAUX_CAP			    0x020   /* 1.2 */

# define DP_FAUX_CAP_1			    (1 << 0)

#define DP_MSTM_CAP			    0x021   /* 1.2 */

# define DP_MST_CAP			    (1 << 0)

#define DP_GUID				    0x030   /* 1.2 */

#define DP_PSR_SUPPORT                      0x070   /* XXX 1.2? */

# define DP_PSR_IS_SUPPORTED                1

#define DP_PSR_CAPS                         0x071   /* XXX 1.2? */

# define DP_PSR_NO_TRAIN_ON_EXIT            1

# define DP_PSR_SETUP_TIME_330              (0 << 1)

# define DP_PSR_SETUP_TIME_275              (1 << 1)

# define DP_PSR_SETUP_TIME_220              (2 << 1)

# define DP_PSR_SETUP_TIME_165              (3 << 1)

# define DP_PSR_SETUP_TIME_110              (4 << 1)

# define DP_PSR_SETUP_TIME_55               (5 << 1)

# define DP_PSR_SETUP_TIME_0                (6 << 1)

# define DP_PSR_SETUP_TIME_MASK             (7 << 1)

# define DP_PSR_SETUP_TIME_SHIFT            1

/*

 * 0x80-0x8f describe downstream port capabilities, but there are two layouts

 * based on whether DP_DETAILED_CAP_INFO_AVAILABLE was set.  If it was not,

 * each port's descriptor is one byte wide.  If it was set, each port's is

 * four bytes wide, starting with the one byte from the base info.  As of

 * DP interop v1.1a only VGA defines additional detail.

 */

/* offset 0 */

#define DP_DOWNSTREAM_PORT_0		    0x80

# define DP_DS_PORT_TYPE_MASK		    (7 << 0)

# define DP_DS_PORT_TYPE_DP		    0

# define DP_DS_PORT_TYPE_VGA		    1

# define DP_DS_PORT_TYPE_DVI		    2

# define DP_DS_PORT_TYPE_HDMI		    3

# define DP_DS_PORT_TYPE_NON_EDID	    4

# define DP_DS_PORT_HPD			    (1 << 3)

/* offset 1 for VGA is maximum megapixels per second / 8 */

/* offset 2 */

# define DP_DS_VGA_MAX_BPC_MASK		    (3 << 0)

# define DP_DS_VGA_8BPC			    0

# define DP_DS_VGA_10BPC		    1

# define DP_DS_VGA_12BPC		    2

# define DP_DS_VGA_16BPC		    3

/* link configuration */

#define	DP_LINK_BW_SET		            0x100

# define DP_LINK_BW_1_62		    0x06

# define DP_LINK_BW_2_7			    0x0a

# define DP_LINK_BW_5_4			    0x14    /* 1.2 */

#define DP_LANE_COUNT_SET	            0x101

# define DP_LANE_COUNT_MASK		    0x0f

# define DP_LANE_COUNT_ENHANCED_FRAME_EN    (1 << 7)

#define DP_TRAINING_PATTERN_SET	            0x102

# define DP_TRAINING_PATTERN_DISABLE	    0

# define DP_TRAINING_PATTERN_1		    1

# define DP_TRAINING_PATTERN_2		    2

# define DP_TRAINING_PATTERN_3		    3	    /* 1.2 */

# define DP_TRAINING_PATTERN_MASK	    0x3

# define DP_LINK_QUAL_PATTERN_DISABLE	    (0 << 2)

# define DP_LINK_QUAL_PATTERN_D10_2	    (1 << 2)

# define DP_LINK_QUAL_PATTERN_ERROR_RATE    (2 << 2)

# define DP_LINK_QUAL_PATTERN_PRBS7	    (3 << 2)

# define DP_LINK_QUAL_PATTERN_MASK	    (3 << 2)

# define DP_RECOVERED_CLOCK_OUT_EN	    (1 << 4)

# define DP_LINK_SCRAMBLING_DISABLE	    (1 << 5)

# define DP_SYMBOL_ERROR_COUNT_BOTH	    (0 << 6)

# define DP_SYMBOL_ERROR_COUNT_DISPARITY    (1 << 6)

# define DP_SYMBOL_ERROR_COUNT_SYMBOL	    (2 << 6)

# define DP_SYMBOL_ERROR_COUNT_MASK	    (3 << 6)

#define DP_TRAINING_LANE0_SET		    0x103

#define DP_TRAINING_LANE1_SET		    0x104

#define DP_TRAINING_LANE2_SET		    0x105

#define DP_TRAINING_LANE3_SET		    0x106

# define DP_TRAIN_VOLTAGE_SWING_MASK	    0x3

# define DP_TRAIN_VOLTAGE_SWING_SHIFT	    0

# define DP_TRAIN_MAX_SWING_REACHED	    (1 << 2)

# define DP_TRAIN_VOLTAGE_SWING_400	    (0 << 0)

# define DP_TRAIN_VOLTAGE_SWING_600	    (1 << 0)

# define DP_TRAIN_VOLTAGE_SWING_800	    (2 << 0)

# define DP_TRAIN_VOLTAGE_SWING_1200	    (3 << 0)

# define DP_TRAIN_PRE_EMPHASIS_MASK	    (3 << 3)

# define DP_TRAIN_PRE_EMPHASIS_0	    (0 << 3)

# define DP_TRAIN_PRE_EMPHASIS_3_5	    (1 << 3)

# define DP_TRAIN_PRE_EMPHASIS_6	    (2 << 3)

# define DP_TRAIN_PRE_EMPHASIS_9_5	    (3 << 3)

# define DP_TRAIN_PRE_EMPHASIS_SHIFT	    3

# define DP_TRAIN_MAX_PRE_EMPHASIS_REACHED  (1 << 5)

#define DP_DOWNSPREAD_CTRL		    0x107

# define DP_SPREAD_AMP_0_5		    (1 << 4)

# define DP_MSA_TIMING_PAR_IGNORE_EN	    (1 << 7) /* eDP */

#define DP_MAIN_LINK_CHANNEL_CODING_SET	    0x108

# define DP_SET_ANSI_8B10B		    (1 << 0)

#define DP_I2C_SPEED_CONTROL_STATUS	    0x109   /* DPI */

/* bitmask as for DP_I2C_SPEED_CAP */

#define DP_EDP_CONFIGURATION_SET            0x10a   /* XXX 1.2? */

#define DP_MSTM_CTRL			    0x111   /* 1.2 */

# define DP_MST_EN			    (1 << 0)

# define DP_UP_REQ_EN			    (1 << 1)

# define DP_UPSTREAM_IS_SRC		    (1 << 2)

#define DP_PSR_EN_CFG			    0x170   /* XXX 1.2? */

# define DP_PSR_ENABLE			    (1 << 0)

# define DP_PSR_MAIN_LINK_ACTIVE	    (1 << 1)

# define DP_PSR_CRC_VERIFICATION	    (1 << 2)

# define DP_PSR_FRAME_CAPTURE		    (1 << 3)

#define DP_ADAPTER_CTRL			    0x1a0

# define DP_ADAPTER_CTRL_FORCE_LOAD_SENSE   (1 << 0)

#define DP_BRANCH_DEVICE_CTRL		    0x1a1

# define DP_BRANCH_DEVICE_IRQ_HPD	    (1 << 0)

#define DP_PAYLOAD_ALLOCATE_SET		    0x1c0

#define DP_PAYLOAD_ALLOCATE_START_TIME_SLOT 0x1c1

#define DP_PAYLOAD_ALLOCATE_TIME_SLOT_COUNT 0x1c2

#define DP_SINK_COUNT			    0x200

/* prior to 1.2 bit 7 was reserved mbz */

# define DP_GET_SINK_COUNT(x)		    ((((x) & 0x80) >> 1) | ((x) & 0x3f))

# define DP_SINK_CP_READY		    (1 << 6)

#define DP_DEVICE_SERVICE_IRQ_VECTOR	    0x201

# define DP_REMOTE_CONTROL_COMMAND_PENDING  (1 << 0)

# define DP_AUTOMATED_TEST_REQUEST	    (1 << 1)

# define DP_CP_IRQ			    (1 << 2)

# define DP_MCCS_IRQ			    (1 << 3)

# define DP_DOWN_REP_MSG_RDY		    (1 << 4) /* 1.2 MST */

# define DP_UP_REQ_MSG_RDY		    (1 << 5) /* 1.2 MST */

# define DP_SINK_SPECIFIC_IRQ		    (1 << 6)

#define DP_LANE0_1_STATUS		    0x202

#define DP_LANE2_3_STATUS		    0x203

# define DP_LANE_CR_DONE		    (1 << 0)

# define DP_LANE_CHANNEL_EQ_DONE	    (1 << 1)

# define DP_LANE_SYMBOL_LOCKED		    (1 << 2)

#define DP_CHANNEL_EQ_BITS (DP_LANE_CR_DONE |		\

			    DP_LANE_CHANNEL_EQ_DONE |	\

			    DP_LANE_SYMBOL_LOCKED)

#define DP_LANE_ALIGN_STATUS_UPDATED	    0x204

#define DP_INTERLANE_ALIGN_DONE		    (1 << 0)

#define DP_DOWNSTREAM_PORT_STATUS_CHANGED   (1 << 6)

#define DP_LINK_STATUS_UPDATED		    (1 << 7)

#define DP_SINK_STATUS			    0x205

#define DP_RECEIVE_PORT_0_STATUS	    (1 << 0)

#define DP_RECEIVE_PORT_1_STATUS	    (1 << 1)

#define DP_ADJUST_REQUEST_LANE0_1	    0x206

#define DP_ADJUST_REQUEST_LANE2_3	    0x207

# define DP_ADJUST_VOLTAGE_SWING_LANE0_MASK  0x03

# define DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT 0

# define DP_ADJUST_PRE_EMPHASIS_LANE0_MASK   0x0c

# define DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT  2

# define DP_ADJUST_VOLTAGE_SWING_LANE1_MASK  0x30

# define DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT 4

# define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK   0xc0

# define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT  6

#define DP_TEST_REQUEST			    0x218

# define DP_TEST_LINK_TRAINING		    (1 << 0)

# define DP_TEST_LINK_VIDEO_PATTERN	    (1 << 1)

# define DP_TEST_LINK_EDID_READ		    (1 << 2)

# define DP_TEST_LINK_PHY_TEST_PATTERN	    (1 << 3) /* DPCD >= 1.1 */

# define DP_TEST_LINK_FAUX_PATTERN	    (1 << 4) /* DPCD >= 1.2 */

#define DP_TEST_LINK_RATE		    0x219

# define DP_LINK_RATE_162		    (0x6)

# define DP_LINK_RATE_27		    (0xa)

#define DP_TEST_LANE_COUNT		    0x220

#define DP_TEST_PATTERN			    0x221

#define DP_TEST_CRC_R_CR		    0x240

#define DP_TEST_CRC_G_Y			    0x242

#define DP_TEST_CRC_B_CB		    0x244

#define DP_TEST_SINK_MISC		    0x246

#define DP_TEST_CRC_SUPPORTED		    (1 << 5)

#define DP_TEST_RESPONSE		    0x260

# define DP_TEST_ACK			    (1 << 0)

# define DP_TEST_NAK			    (1 << 1)

# define DP_TEST_EDID_CHECKSUM_WRITE	    (1 << 2)

#define DP_TEST_EDID_CHECKSUM		    0x261

#define DP_TEST_SINK			    0x270

#define DP_TEST_SINK_START	    (1 << 0)

#define DP_PAYLOAD_TABLE_UPDATE_STATUS      0x2c0   /* 1.2 MST */

# define DP_PAYLOAD_TABLE_UPDATED           (1 << 0)

# define DP_PAYLOAD_ACT_HANDLED             (1 << 1)

#define DP_VC_PAYLOAD_ID_SLOT_1             0x2c1   /* 1.2 MST */

/* up to ID_SLOT_63 at 0x2ff */

#define DP_SOURCE_OUI			    0x300

#define DP_SINK_OUI			    0x400

#define DP_BRANCH_OUI			    0x500

#define DP_SET_POWER                        0x600

# define DP_SET_POWER_D0                    0x1

# define DP_SET_POWER_D3                    0x2

# define DP_SET_POWER_MASK                  0x3

#define DP_SIDEBAND_MSG_DOWN_REQ_BASE	    0x1000   /* 1.2 MST */

#define DP_SIDEBAND_MSG_UP_REP_BASE	    0x1200   /* 1.2 MST */

#define DP_SIDEBAND_MSG_DOWN_REP_BASE	    0x1400   /* 1.2 MST */

#define DP_SIDEBAND_MSG_UP_REQ_BASE	    0x1600   /* 1.2 MST */

#define DP_SINK_COUNT_ESI		    0x2002   /* 1.2 */

/* 0-5 sink count */

# define DP_SINK_COUNT_CP_READY             (1 << 6)

#define DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0   0x2003   /* 1.2 */

#define DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1   0x2004   /* 1.2 */

#define DP_LINK_SERVICE_IRQ_VECTOR_ESI0     0x2005   /* 1.2 */

#define DP_PSR_ERROR_STATUS                 0x2006  /* XXX 1.2? */

# define DP_PSR_LINK_CRC_ERROR              (1 << 0)

# define DP_PSR_RFB_STORAGE_ERROR           (1 << 1)

#define DP_PSR_ESI                          0x2007  /* XXX 1.2? */

# define DP_PSR_CAPS_CHANGE                 (1 << 0)

#define DP_PSR_STATUS                       0x2008  /* XXX 1.2? */

# define DP_PSR_SINK_INACTIVE               0

# define DP_PSR_SINK_ACTIVE_SRC_SYNCED      1

# define DP_PSR_SINK_ACTIVE_RFB             2

# define DP_PSR_SINK_ACTIVE_SINK_SYNCED     3

# define DP_PSR_SINK_ACTIVE_RESYNC          4

# define DP_PSR_SINK_INTERNAL_ERROR         7

# define DP_PSR_SINK_STATE_MASK             0x07

/* DP 1.2 Sideband message defines */

/* peer device type - DP 1.2a Table 2-92 */

#define DP_PEER_DEVICE_NONE		0x0

#define DP_PEER_DEVICE_SOURCE_OR_SST	0x1

#define DP_PEER_DEVICE_MST_BRANCHING	0x2

#define DP_PEER_DEVICE_SST_SINK		0x3

#define DP_PEER_DEVICE_DP_LEGACY_CONV	0x4

/* DP 1.2 MST sideband request names DP 1.2a Table 2-80 */

#define DP_LINK_ADDRESS			0x01

#define DP_CONNECTION_STATUS_NOTIFY	0x02

#define DP_ENUM_PATH_RESOURCES		0x10

#define DP_ALLOCATE_PAYLOAD		0x11

#define DP_QUERY_PAYLOAD		0x12

#define DP_RESOURCE_STATUS_NOTIFY	0x13

#define DP_CLEAR_PAYLOAD_ID_TABLE	0x14

#define DP_REMOTE_DPCD_READ		0x20

#define DP_REMOTE_DPCD_WRITE		0x21

#define DP_REMOTE_I2C_READ		0x22

#define DP_REMOTE_I2C_WRITE		0x23

#define DP_POWER_UP_PHY			0x24

#define DP_POWER_DOWN_PHY		0x25

#define DP_SINK_EVENT_NOTIFY		0x30

#define DP_QUERY_STREAM_ENC_STATUS	0x38

/* DP 1.2 MST sideband nak reasons - table 2.84 */

#define DP_NAK_WRITE_FAILURE		0x01

#define DP_NAK_INVALID_READ		0x02

#define DP_NAK_CRC_FAILURE		0x03

#define DP_NAK_BAD_PARAM		0x04

#define DP_NAK_DEFER			0x05

#define DP_NAK_LINK_FAILURE		0x06

#define DP_NAK_NO_RESOURCES		0x07

#define DP_NAK_DPCD_FAIL		0x08

#define DP_NAK_I2C_NAK			0x09

#define DP_NAK_ALLOCATE_FAIL		0x0a

#define MODE_I2C_START	1

#define MODE_I2C_WRITE	2

#define MODE_I2C_READ	4

#define MODE_I2C_STOP	8

/**

 * struct i2c_algo_dp_aux_data - driver interface structure for i2c over dp

 * 				 aux algorithm

 * @running: set by the algo indicating whether an i2c is ongoing or whether

 * 	     the i2c bus is quiescent

 * @address: i2c target address for the currently ongoing transfer

 * @aux_ch: driver callback to transfer a single byte of the i2c payload

 */

struct i2c_algo_dp_aux_data {

	bool running;

	u16 address;

	int (*aux_ch) (struct i2c_adapter *adapter,

		       int mode, uint8_t write_byte,

		       uint8_t *read_byte);

};

int

i2c_dp_aux_add_bus(struct i2c_adapter *adapter);

#define DP_LINK_STATUS_SIZE	   6

bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],

			  int lane_count);

bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],

			      int lane_count);

u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],

				     int lane);

u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE],

					  int lane);

#define DP_RECEIVER_CAP_SIZE	0xf

#define EDP_PSR_RECEIVER_CAP_SIZE	2

void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);

void drm_dp_link_train_channel_eq_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);

u8 drm_dp_link_rate_to_bw_code(int link_rate);

int drm_dp_bw_code_to_link_rate(u8 link_bw);

struct edp_sdp_header {

	u8 HB0; /* Secondary Data Packet ID */

	u8 HB1; /* Secondary Data Packet Type */

	u8 HB2; /* 7:5 reserved, 4:0 revision number */

	u8 HB3; /* 7:5 reserved, 4:0 number of valid data bytes */

} __packed;

#define EDP_SDP_HEADER_REVISION_MASK		0x1F

#define EDP_SDP_HEADER_VALID_PAYLOAD_BYTES	0x1F

struct edp_vsc_psr {

	struct edp_sdp_header sdp_header;

	u8 DB0; /* Stereo Interface */

	u8 DB1; /* 0 - PSR State; 1 - Update RFB; 2 - CRC Valid */

	u8 DB2; /* CRC value bits 7:0 of the R or Cr component */

	u8 DB3; /* CRC value bits 15:8 of the R or Cr component */

	u8 DB4; /* CRC value bits 7:0 of the G or Y component */

	u8 DB5; /* CRC value bits 15:8 of the G or Y component */

	u8 DB6; /* CRC value bits 7:0 of the B or Cb component */

	u8 DB7; /* CRC value bits 15:8 of the B or Cb component */

	u8 DB8_31[24]; /* Reserved */

} __packed;

#define EDP_VSC_PSR_STATE_ACTIVE	(1<<0)

#define EDP_VSC_PSR_UPDATE_RFB		(1<<1)

#define EDP_VSC_PSR_CRC_VALUES_VALID	(1<<2)

static inline int

drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE])

{

	return drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);

}

static inline u8

drm_dp_max_lane_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE])

{

	return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;

}

static inline bool

drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])

{

	return dpcd[DP_DPCD_REV] >= 0x11 &&

		(dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP);

}

/*

 * DisplayPort AUX channel

 */

/**

 * struct drm_dp_aux_msg - DisplayPort AUX channel transaction

 * @address: address of the (first) register to access

 * @request: contains the type of transaction (see DP_AUX_* macros)

 * @reply: upon completion, contains the reply type of the transaction

 * @buffer: pointer to a transmission or reception buffer

 * @size: size of @buffer

 */

struct drm_dp_aux_msg {

	unsigned int address;

	u8 request;

	u8 reply;

	void *buffer;

	size_t size;

};

/**

 * struct drm_dp_aux - DisplayPort AUX channel

 * @name: user-visible name of this AUX channel and the I2C-over-AUX adapter

 * @ddc: I2C adapter that can be used for I2C-over-AUX communication

 * @dev: pointer to struct device that is the parent for this AUX channel

 * @hw_mutex: internal mutex used for locking transfers

 * @transfer: transfers a message representing a single AUX transaction

 *

 * The .dev field should be set to a pointer to the device that implements

 * the AUX channel.

 *

 * The .name field may be used to specify the name of the I2C adapter. If set to

 * NULL, dev_name() of .dev will be used.

 *

 * Drivers provide a hardware-specific implementation of how transactions

 * are executed via the .transfer() function. A pointer to a drm_dp_aux_msg

 * structure describing the transaction is passed into this function. Upon

 * success, the implementation should return the number of payload bytes

 * that were transferred, or a negative error-code on failure. Helpers

 * propagate errors from the .transfer() function, with the exception of

 * the -EBUSY error, which causes a transaction to be retried. On a short,

 * helpers will return -EPROTO to make it simpler to check for failure.

 *

 * An AUX channel can also be used to transport I2C messages to a sink. A

 * typical application of that is to access an EDID that's present in the

 * sink device. The .transfer() function can also be used to execute such

 * transactions. The drm_dp_aux_register_i2c_bus() function registers an

 * I2C adapter that can be passed to drm_probe_ddc(). Upon removal, drivers

 * should call drm_dp_aux_unregister_i2c_bus() to remove the I2C adapter.

 *

 * Note that the aux helper code assumes that the .transfer() function

 * only modifies the reply field of the drm_dp_aux_msg structure.  The

 * retry logic and i2c helpers assume this is the case.

 */

struct drm_dp_aux {

	const char *name;

	struct i2c_adapter ddc;

	struct device *dev;

	struct mutex hw_mutex;

	ssize_t (*transfer)(struct drm_dp_aux *aux,

			    struct drm_dp_aux_msg *msg);

};

ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,

			 void *buffer, size_t size);

ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset,

			  void *buffer, size_t size);

/**

 * drm_dp_dpcd_readb() - read a single byte from the DPCD

 * @aux: DisplayPort AUX channel

 * @offset: address of the register to read

 * @valuep: location where the value of the register will be stored

 *

 * Returns the number of bytes transferred (1) on success, or a negative

 * error code on failure.

 */

static inline ssize_t drm_dp_dpcd_readb(struct drm_dp_aux *aux,

					unsigned int offset, u8 *valuep)

{

	return drm_dp_dpcd_read(aux, offset, valuep, 1);

}

/**

 * drm_dp_dpcd_writeb() - write a single byte to the DPCD

 * @aux: DisplayPort AUX channel

 * @offset: address of the register to write

 * @value: value to write to the register

 *

 * Returns the number of bytes transferred (1) on success, or a negative

 * error code on failure.

 */

static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux,

					 unsigned int offset, u8 value)

{

	return drm_dp_dpcd_write(aux, offset, &value, 1);

}

int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,

				 u8 status[DP_LINK_STATUS_SIZE]);

/*

 * DisplayPort link

 */

#define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0)

struct drm_dp_link {

	unsigned char revision;

	unsigned int rate;

	unsigned int num_lanes;

	unsigned long capabilities;

};

int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_aux_register(struct drm_dp_aux *aux);

void drm_dp_aux_unregister(struct drm_dp_aux *aux);

#endif /* _DRM_DP_HELPER_H_ */