596 lines
21 KiB
C
596 lines
21 KiB
C
/*
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* Copyright © 2008 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#ifndef _DRM_DP_HELPER_H_
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#define _DRM_DP_HELPER_H_
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#include <linux/types.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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/*
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* Unless otherwise noted, all values are from the DP 1.1a spec. Note that
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* DP and DPCD versions are independent. Differences from 1.0 are not noted,
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* 1.0 devices basically don't exist in the wild.
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*
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* Abbreviations, in chronological order:
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*
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* eDP: Embedded DisplayPort version 1
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* DPI: DisplayPort Interoperability Guideline v1.1a
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* 1.2: DisplayPort 1.2
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* MST: Multistream Transport - part of DP 1.2a
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*
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* 1.2 formally includes both eDP and DPI definitions.
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*/
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#define DP_AUX_I2C_WRITE 0x0
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#define DP_AUX_I2C_READ 0x1
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#define DP_AUX_I2C_STATUS 0x2
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#define DP_AUX_I2C_MOT 0x4
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#define DP_AUX_NATIVE_WRITE 0x8
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#define DP_AUX_NATIVE_READ 0x9
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#define DP_AUX_NATIVE_REPLY_ACK (0x0 << 0)
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#define DP_AUX_NATIVE_REPLY_NACK (0x1 << 0)
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#define DP_AUX_NATIVE_REPLY_DEFER (0x2 << 0)
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#define DP_AUX_NATIVE_REPLY_MASK (0x3 << 0)
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#define DP_AUX_I2C_REPLY_ACK (0x0 << 2)
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#define DP_AUX_I2C_REPLY_NACK (0x1 << 2)
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#define DP_AUX_I2C_REPLY_DEFER (0x2 << 2)
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#define DP_AUX_I2C_REPLY_MASK (0x3 << 2)
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/* AUX CH addresses */
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/* DPCD */
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#define DP_DPCD_REV 0x000
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#define DP_MAX_LINK_RATE 0x001
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#define DP_MAX_LANE_COUNT 0x002
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# define DP_MAX_LANE_COUNT_MASK 0x1f
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# define DP_TPS3_SUPPORTED (1 << 6) /* 1.2 */
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# define DP_ENHANCED_FRAME_CAP (1 << 7)
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#define DP_MAX_DOWNSPREAD 0x003
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# define DP_NO_AUX_HANDSHAKE_LINK_TRAINING (1 << 6)
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#define DP_NORP 0x004
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#define DP_DOWNSTREAMPORT_PRESENT 0x005
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# define DP_DWN_STRM_PORT_PRESENT (1 << 0)
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# define DP_DWN_STRM_PORT_TYPE_MASK 0x06
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# define DP_DWN_STRM_PORT_TYPE_DP (0 << 1)
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# define DP_DWN_STRM_PORT_TYPE_ANALOG (1 << 1)
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# define DP_DWN_STRM_PORT_TYPE_TMDS (2 << 1)
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# define DP_DWN_STRM_PORT_TYPE_OTHER (3 << 1)
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# define DP_FORMAT_CONVERSION (1 << 3)
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# define DP_DETAILED_CAP_INFO_AVAILABLE (1 << 4) /* DPI */
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#define DP_MAIN_LINK_CHANNEL_CODING 0x006
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#define DP_DOWN_STREAM_PORT_COUNT 0x007
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# define DP_PORT_COUNT_MASK 0x0f
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# define DP_MSA_TIMING_PAR_IGNORED (1 << 6) /* eDP */
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# define DP_OUI_SUPPORT (1 << 7)
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#define DP_I2C_SPEED_CAP 0x00c /* DPI */
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# define DP_I2C_SPEED_1K 0x01
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# define DP_I2C_SPEED_5K 0x02
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# define DP_I2C_SPEED_10K 0x04
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# define DP_I2C_SPEED_100K 0x08
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# define DP_I2C_SPEED_400K 0x10
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# define DP_I2C_SPEED_1M 0x20
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#define DP_EDP_CONFIGURATION_CAP 0x00d /* XXX 1.2? */
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#define DP_TRAINING_AUX_RD_INTERVAL 0x00e /* XXX 1.2? */
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/* Multiple stream transport */
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#define DP_FAUX_CAP 0x020 /* 1.2 */
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# define DP_FAUX_CAP_1 (1 << 0)
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#define DP_MSTM_CAP 0x021 /* 1.2 */
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# define DP_MST_CAP (1 << 0)
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#define DP_GUID 0x030 /* 1.2 */
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#define DP_PSR_SUPPORT 0x070 /* XXX 1.2? */
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# define DP_PSR_IS_SUPPORTED 1
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#define DP_PSR_CAPS 0x071 /* XXX 1.2? */
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# define DP_PSR_NO_TRAIN_ON_EXIT 1
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# define DP_PSR_SETUP_TIME_330 (0 << 1)
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# define DP_PSR_SETUP_TIME_275 (1 << 1)
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# define DP_PSR_SETUP_TIME_220 (2 << 1)
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# define DP_PSR_SETUP_TIME_165 (3 << 1)
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# define DP_PSR_SETUP_TIME_110 (4 << 1)
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# define DP_PSR_SETUP_TIME_55 (5 << 1)
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# define DP_PSR_SETUP_TIME_0 (6 << 1)
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# define DP_PSR_SETUP_TIME_MASK (7 << 1)
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# define DP_PSR_SETUP_TIME_SHIFT 1
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/*
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* 0x80-0x8f describe downstream port capabilities, but there are two layouts
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* based on whether DP_DETAILED_CAP_INFO_AVAILABLE was set. If it was not,
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* each port's descriptor is one byte wide. If it was set, each port's is
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* four bytes wide, starting with the one byte from the base info. As of
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* DP interop v1.1a only VGA defines additional detail.
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*/
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/* offset 0 */
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#define DP_DOWNSTREAM_PORT_0 0x80
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# define DP_DS_PORT_TYPE_MASK (7 << 0)
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# define DP_DS_PORT_TYPE_DP 0
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# define DP_DS_PORT_TYPE_VGA 1
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# define DP_DS_PORT_TYPE_DVI 2
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# define DP_DS_PORT_TYPE_HDMI 3
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# define DP_DS_PORT_TYPE_NON_EDID 4
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# define DP_DS_PORT_HPD (1 << 3)
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/* offset 1 for VGA is maximum megapixels per second / 8 */
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/* offset 2 */
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# define DP_DS_VGA_MAX_BPC_MASK (3 << 0)
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# define DP_DS_VGA_8BPC 0
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# define DP_DS_VGA_10BPC 1
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# define DP_DS_VGA_12BPC 2
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# define DP_DS_VGA_16BPC 3
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/* link configuration */
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#define DP_LINK_BW_SET 0x100
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# define DP_LINK_BW_1_62 0x06
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# define DP_LINK_BW_2_7 0x0a
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# define DP_LINK_BW_5_4 0x14 /* 1.2 */
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#define DP_LANE_COUNT_SET 0x101
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# define DP_LANE_COUNT_MASK 0x0f
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# define DP_LANE_COUNT_ENHANCED_FRAME_EN (1 << 7)
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#define DP_TRAINING_PATTERN_SET 0x102
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# define DP_TRAINING_PATTERN_DISABLE 0
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# define DP_TRAINING_PATTERN_1 1
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# define DP_TRAINING_PATTERN_2 2
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# define DP_TRAINING_PATTERN_3 3 /* 1.2 */
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# define DP_TRAINING_PATTERN_MASK 0x3
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# define DP_LINK_QUAL_PATTERN_DISABLE (0 << 2)
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# define DP_LINK_QUAL_PATTERN_D10_2 (1 << 2)
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# define DP_LINK_QUAL_PATTERN_ERROR_RATE (2 << 2)
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# define DP_LINK_QUAL_PATTERN_PRBS7 (3 << 2)
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# define DP_LINK_QUAL_PATTERN_MASK (3 << 2)
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# define DP_RECOVERED_CLOCK_OUT_EN (1 << 4)
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# define DP_LINK_SCRAMBLING_DISABLE (1 << 5)
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# define DP_SYMBOL_ERROR_COUNT_BOTH (0 << 6)
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# define DP_SYMBOL_ERROR_COUNT_DISPARITY (1 << 6)
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# define DP_SYMBOL_ERROR_COUNT_SYMBOL (2 << 6)
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# define DP_SYMBOL_ERROR_COUNT_MASK (3 << 6)
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#define DP_TRAINING_LANE0_SET 0x103
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#define DP_TRAINING_LANE1_SET 0x104
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#define DP_TRAINING_LANE2_SET 0x105
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#define DP_TRAINING_LANE3_SET 0x106
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# define DP_TRAIN_VOLTAGE_SWING_MASK 0x3
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# define DP_TRAIN_VOLTAGE_SWING_SHIFT 0
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# define DP_TRAIN_MAX_SWING_REACHED (1 << 2)
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# define DP_TRAIN_VOLTAGE_SWING_LEVEL_0 (0 << 0)
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# define DP_TRAIN_VOLTAGE_SWING_LEVEL_1 (1 << 0)
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# define DP_TRAIN_VOLTAGE_SWING_LEVEL_2 (2 << 0)
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# define DP_TRAIN_VOLTAGE_SWING_LEVEL_3 (3 << 0)
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# define DP_TRAIN_PRE_EMPHASIS_MASK (3 << 3)
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# define DP_TRAIN_PRE_EMPH_LEVEL_0 (0 << 3)
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# define DP_TRAIN_PRE_EMPH_LEVEL_1 (1 << 3)
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# define DP_TRAIN_PRE_EMPH_LEVEL_2 (2 << 3)
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# define DP_TRAIN_PRE_EMPH_LEVEL_3 (3 << 3)
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# define DP_TRAIN_PRE_EMPHASIS_SHIFT 3
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# define DP_TRAIN_MAX_PRE_EMPHASIS_REACHED (1 << 5)
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#define DP_DOWNSPREAD_CTRL 0x107
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# define DP_SPREAD_AMP_0_5 (1 << 4)
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# define DP_MSA_TIMING_PAR_IGNORE_EN (1 << 7) /* eDP */
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#define DP_MAIN_LINK_CHANNEL_CODING_SET 0x108
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# define DP_SET_ANSI_8B10B (1 << 0)
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#define DP_I2C_SPEED_CONTROL_STATUS 0x109 /* DPI */
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/* bitmask as for DP_I2C_SPEED_CAP */
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#define DP_EDP_CONFIGURATION_SET 0x10a /* XXX 1.2? */
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#define DP_MSTM_CTRL 0x111 /* 1.2 */
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# define DP_MST_EN (1 << 0)
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# define DP_UP_REQ_EN (1 << 1)
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# define DP_UPSTREAM_IS_SRC (1 << 2)
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#define DP_PSR_EN_CFG 0x170 /* XXX 1.2? */
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# define DP_PSR_ENABLE (1 << 0)
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# define DP_PSR_MAIN_LINK_ACTIVE (1 << 1)
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# define DP_PSR_CRC_VERIFICATION (1 << 2)
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# define DP_PSR_FRAME_CAPTURE (1 << 3)
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#define DP_ADAPTER_CTRL 0x1a0
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# define DP_ADAPTER_CTRL_FORCE_LOAD_SENSE (1 << 0)
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#define DP_BRANCH_DEVICE_CTRL 0x1a1
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# define DP_BRANCH_DEVICE_IRQ_HPD (1 << 0)
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#define DP_PAYLOAD_ALLOCATE_SET 0x1c0
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#define DP_PAYLOAD_ALLOCATE_START_TIME_SLOT 0x1c1
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#define DP_PAYLOAD_ALLOCATE_TIME_SLOT_COUNT 0x1c2
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#define DP_SINK_COUNT 0x200
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/* prior to 1.2 bit 7 was reserved mbz */
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# define DP_GET_SINK_COUNT(x) ((((x) & 0x80) >> 1) | ((x) & 0x3f))
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# define DP_SINK_CP_READY (1 << 6)
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#define DP_DEVICE_SERVICE_IRQ_VECTOR 0x201
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# define DP_REMOTE_CONTROL_COMMAND_PENDING (1 << 0)
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# define DP_AUTOMATED_TEST_REQUEST (1 << 1)
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# define DP_CP_IRQ (1 << 2)
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# define DP_MCCS_IRQ (1 << 3)
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# define DP_DOWN_REP_MSG_RDY (1 << 4) /* 1.2 MST */
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# define DP_UP_REQ_MSG_RDY (1 << 5) /* 1.2 MST */
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# define DP_SINK_SPECIFIC_IRQ (1 << 6)
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#define DP_LANE0_1_STATUS 0x202
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#define DP_LANE2_3_STATUS 0x203
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# define DP_LANE_CR_DONE (1 << 0)
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# define DP_LANE_CHANNEL_EQ_DONE (1 << 1)
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# define DP_LANE_SYMBOL_LOCKED (1 << 2)
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#define DP_CHANNEL_EQ_BITS (DP_LANE_CR_DONE | \
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DP_LANE_CHANNEL_EQ_DONE | \
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DP_LANE_SYMBOL_LOCKED)
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#define DP_LANE_ALIGN_STATUS_UPDATED 0x204
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#define DP_INTERLANE_ALIGN_DONE (1 << 0)
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#define DP_DOWNSTREAM_PORT_STATUS_CHANGED (1 << 6)
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#define DP_LINK_STATUS_UPDATED (1 << 7)
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#define DP_SINK_STATUS 0x205
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#define DP_RECEIVE_PORT_0_STATUS (1 << 0)
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#define DP_RECEIVE_PORT_1_STATUS (1 << 1)
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#define DP_ADJUST_REQUEST_LANE0_1 0x206
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#define DP_ADJUST_REQUEST_LANE2_3 0x207
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# define DP_ADJUST_VOLTAGE_SWING_LANE0_MASK 0x03
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# define DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT 0
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# define DP_ADJUST_PRE_EMPHASIS_LANE0_MASK 0x0c
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# define DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT 2
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# define DP_ADJUST_VOLTAGE_SWING_LANE1_MASK 0x30
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# define DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT 4
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# define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK 0xc0
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# define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT 6
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#define DP_TEST_REQUEST 0x218
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# define DP_TEST_LINK_TRAINING (1 << 0)
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# define DP_TEST_LINK_VIDEO_PATTERN (1 << 1)
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# define DP_TEST_LINK_EDID_READ (1 << 2)
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# define DP_TEST_LINK_PHY_TEST_PATTERN (1 << 3) /* DPCD >= 1.1 */
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# define DP_TEST_LINK_FAUX_PATTERN (1 << 4) /* DPCD >= 1.2 */
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#define DP_TEST_LINK_RATE 0x219
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# define DP_LINK_RATE_162 (0x6)
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# define DP_LINK_RATE_27 (0xa)
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#define DP_TEST_LANE_COUNT 0x220
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#define DP_TEST_PATTERN 0x221
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#define DP_TEST_CRC_R_CR 0x240
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#define DP_TEST_CRC_G_Y 0x242
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#define DP_TEST_CRC_B_CB 0x244
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#define DP_TEST_SINK_MISC 0x246
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# define DP_TEST_CRC_SUPPORTED (1 << 5)
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# define DP_TEST_COUNT_MASK 0x7
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#define DP_TEST_RESPONSE 0x260
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# define DP_TEST_ACK (1 << 0)
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# define DP_TEST_NAK (1 << 1)
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# define DP_TEST_EDID_CHECKSUM_WRITE (1 << 2)
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#define DP_TEST_EDID_CHECKSUM 0x261
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#define DP_TEST_SINK 0x270
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# define DP_TEST_SINK_START (1 << 0)
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#define DP_PAYLOAD_TABLE_UPDATE_STATUS 0x2c0 /* 1.2 MST */
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# define DP_PAYLOAD_TABLE_UPDATED (1 << 0)
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# define DP_PAYLOAD_ACT_HANDLED (1 << 1)
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#define DP_VC_PAYLOAD_ID_SLOT_1 0x2c1 /* 1.2 MST */
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/* up to ID_SLOT_63 at 0x2ff */
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#define DP_SOURCE_OUI 0x300
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#define DP_SINK_OUI 0x400
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#define DP_BRANCH_OUI 0x500
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#define DP_SET_POWER 0x600
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# define DP_SET_POWER_D0 0x1
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# define DP_SET_POWER_D3 0x2
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# define DP_SET_POWER_MASK 0x3
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#define DP_SIDEBAND_MSG_DOWN_REQ_BASE 0x1000 /* 1.2 MST */
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#define DP_SIDEBAND_MSG_UP_REP_BASE 0x1200 /* 1.2 MST */
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#define DP_SIDEBAND_MSG_DOWN_REP_BASE 0x1400 /* 1.2 MST */
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#define DP_SIDEBAND_MSG_UP_REQ_BASE 0x1600 /* 1.2 MST */
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#define DP_SINK_COUNT_ESI 0x2002 /* 1.2 */
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/* 0-5 sink count */
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# define DP_SINK_COUNT_CP_READY (1 << 6)
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#define DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0 0x2003 /* 1.2 */
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#define DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1 0x2004 /* 1.2 */
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#define DP_LINK_SERVICE_IRQ_VECTOR_ESI0 0x2005 /* 1.2 */
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#define DP_PSR_ERROR_STATUS 0x2006 /* XXX 1.2? */
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# define DP_PSR_LINK_CRC_ERROR (1 << 0)
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# define DP_PSR_RFB_STORAGE_ERROR (1 << 1)
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#define DP_PSR_ESI 0x2007 /* XXX 1.2? */
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# define DP_PSR_CAPS_CHANGE (1 << 0)
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#define DP_PSR_STATUS 0x2008 /* XXX 1.2? */
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# define DP_PSR_SINK_INACTIVE 0
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# define DP_PSR_SINK_ACTIVE_SRC_SYNCED 1
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# define DP_PSR_SINK_ACTIVE_RFB 2
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# define DP_PSR_SINK_ACTIVE_SINK_SYNCED 3
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# define DP_PSR_SINK_ACTIVE_RESYNC 4
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# define DP_PSR_SINK_INTERNAL_ERROR 7
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# define DP_PSR_SINK_STATE_MASK 0x07
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/* DP 1.2 Sideband message defines */
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/* peer device type - DP 1.2a Table 2-92 */
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#define DP_PEER_DEVICE_NONE 0x0
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#define DP_PEER_DEVICE_SOURCE_OR_SST 0x1
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#define DP_PEER_DEVICE_MST_BRANCHING 0x2
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#define DP_PEER_DEVICE_SST_SINK 0x3
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#define DP_PEER_DEVICE_DP_LEGACY_CONV 0x4
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/* DP 1.2 MST sideband request names DP 1.2a Table 2-80 */
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#define DP_LINK_ADDRESS 0x01
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#define DP_CONNECTION_STATUS_NOTIFY 0x02
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#define DP_ENUM_PATH_RESOURCES 0x10
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#define DP_ALLOCATE_PAYLOAD 0x11
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#define DP_QUERY_PAYLOAD 0x12
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#define DP_RESOURCE_STATUS_NOTIFY 0x13
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#define DP_CLEAR_PAYLOAD_ID_TABLE 0x14
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#define DP_REMOTE_DPCD_READ 0x20
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#define DP_REMOTE_DPCD_WRITE 0x21
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#define DP_REMOTE_I2C_READ 0x22
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#define DP_REMOTE_I2C_WRITE 0x23
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#define DP_POWER_UP_PHY 0x24
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#define DP_POWER_DOWN_PHY 0x25
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#define DP_SINK_EVENT_NOTIFY 0x30
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#define DP_QUERY_STREAM_ENC_STATUS 0x38
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/* DP 1.2 MST sideband nak reasons - table 2.84 */
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#define DP_NAK_WRITE_FAILURE 0x01
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#define DP_NAK_INVALID_READ 0x02
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#define DP_NAK_CRC_FAILURE 0x03
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#define DP_NAK_BAD_PARAM 0x04
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#define DP_NAK_DEFER 0x05
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#define DP_NAK_LINK_FAILURE 0x06
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#define DP_NAK_NO_RESOURCES 0x07
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#define DP_NAK_DPCD_FAIL 0x08
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#define DP_NAK_I2C_NAK 0x09
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#define DP_NAK_ALLOCATE_FAIL 0x0a
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|
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#define MODE_I2C_START 1
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#define MODE_I2C_WRITE 2
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#define MODE_I2C_READ 4
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#define MODE_I2C_STOP 8
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|
|
|
#define DP_LINK_STATUS_SIZE 6
|
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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);
|
|
unsigned i2c_nack_count, i2c_defer_count;
|
|
};
|
|
|
|
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_power_down(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_ */
|