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편집 파일: drm_dp_helper.h

/* * 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 <linux/delay.h> #include <linux/i2c.h> #include <drm/display/drm_dp.h> #include <drm/drm_connector.h> struct drm_device; struct drm_dp_aux; struct drm_panel; 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); u8 drm_dp_get_adjust_tx_ffe_preset(const u8 link_status[DP_LINK_STATUS_SIZE], int lane); int drm_dp_read_clock_recovery_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE], enum drm_dp_phy dp_phy, bool uhbr); int drm_dp_read_channel_eq_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE], enum drm_dp_phy dp_phy, bool uhbr); void drm_dp_link_train_clock_recovery_delay(const struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); void drm_dp_lttpr_link_train_clock_recovery_delay(void); void drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); void drm_dp_lttpr_link_train_channel_eq_delay(const struct drm_dp_aux *aux, const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); int drm_dp_128b132b_read_aux_rd_interval(struct drm_dp_aux *aux); bool drm_dp_128b132b_lane_channel_eq_done(const u8 link_status[DP_LINK_STATUS_SIZE], int lane_count); bool drm_dp_128b132b_lane_symbol_locked(const u8 link_status[DP_LINK_STATUS_SIZE], int lane_count); bool drm_dp_128b132b_eq_interlane_align_done(const u8 link_status[DP_LINK_STATUS_SIZE]); bool drm_dp_128b132b_cds_interlane_align_done(const u8 link_status[DP_LINK_STATUS_SIZE]); bool drm_dp_128b132b_link_training_failed(const u8 link_status[DP_LINK_STATUS_SIZE]); u8 drm_dp_link_rate_to_bw_code(int link_rate); int drm_dp_bw_code_to_link_rate(u8 link_bw); const char *drm_dp_phy_name(enum drm_dp_phy dp_phy); /** * struct drm_dp_vsc_sdp - drm DP VSC SDP * * This structure represents a DP VSC SDP of drm * It is based on DP 1.4 spec [Table 2-116: VSC SDP Header Bytes] and * [Table 2-117: VSC SDP Payload for DB16 through DB18] * * @sdp_type: secondary-data packet type * @revision: revision number * @length: number of valid data bytes * @pixelformat: pixel encoding format * @colorimetry: colorimetry format * @bpc: bit per color * @dynamic_range: dynamic range information * @content_type: CTA-861-G defines content types and expected processing by a sink device */ struct drm_dp_vsc_sdp { unsigned char sdp_type; unsigned char revision; unsigned char length; enum dp_pixelformat pixelformat; enum dp_colorimetry colorimetry; int bpc; enum dp_dynamic_range dynamic_range; enum dp_content_type content_type; }; /** * struct drm_dp_as_sdp - drm DP Adaptive Sync SDP * * This structure represents a DP AS SDP of drm * It is based on DP 2.1 spec [Table 2-126: Adaptive-Sync SDP Header Bytes] and * [Table 2-127: Adaptive-Sync SDP Payload for DB0 through DB8] * * @sdp_type: Secondary-data packet type * @revision: Revision Number * @length: Number of valid data bytes * @vtotal: Minimum Vertical Vtotal * @target_rr: Target Refresh * @duration_incr_ms: Successive frame duration increase * @duration_decr_ms: Successive frame duration decrease * @target_rr_divider: Target refresh rate divider * @mode: Adaptive Sync Operation Mode */ struct drm_dp_as_sdp { unsigned char sdp_type; unsigned char revision; unsigned char length; int vtotal; int target_rr; int duration_incr_ms; int duration_decr_ms; bool target_rr_divider; enum operation_mode mode; }; void drm_dp_as_sdp_log(struct drm_printer *p, const struct drm_dp_as_sdp *as_sdp); void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc); bool drm_dp_vsc_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); bool drm_dp_as_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]); 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); } static inline bool drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_DPCD_REV] >= 0x11 && (dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING); } static inline bool drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_DPCD_REV] >= 0x12 && dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED; } static inline bool drm_dp_max_downspread(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_DPCD_REV] >= 0x11 || dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5; } static inline bool drm_dp_tps4_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_DPCD_REV] >= 0x14 && dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED; } static inline u8 drm_dp_training_pattern_mask(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return (dpcd[DP_DPCD_REV] >= 0x14) ? DP_TRAINING_PATTERN_MASK_1_4 : DP_TRAINING_PATTERN_MASK; } static inline bool drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT; } /* DP/eDP DSC support */ u8 drm_dp_dsc_sink_bpp_incr(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]); u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE], bool is_edp); u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]); int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE], u8 dsc_bpc[3]); static inline bool drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) { return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED; } static inline u16 drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) { return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] | ((dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] & DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK) << 8); } static inline u32 drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) { /* Max Slicewidth = Number of Pixels * 320 */ return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] * DP_DSC_SLICE_WIDTH_MULTIPLIER; } /** * drm_dp_dsc_sink_supports_format() - check if sink supports DSC with given output format * @dsc_dpcd : DSC-capability DPCDs of the sink * @output_format: output_format which is to be checked * * Returns true if the sink supports DSC with the given output_format, false otherwise. */ static inline bool drm_dp_dsc_sink_supports_format(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE], u8 output_format) { return dsc_dpcd[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT] & output_format; } /* Forward Error Correction Support on DP 1.4 */ static inline bool drm_dp_sink_supports_fec(const u8 fec_capable) { return fec_capable & DP_FEC_CAPABLE; } static inline bool drm_dp_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_8B10B; } static inline bool drm_dp_128b132b_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_128B132B; } static inline bool drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_EDP_CONFIGURATION_CAP] & DP_ALTERNATE_SCRAMBLER_RESET_CAP; } /* Ignore MSA timing for Adaptive Sync support on DP 1.4 */ static inline bool drm_dp_sink_can_do_video_without_timing_msa(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_MSA_TIMING_PAR_IGNORED; } /** * drm_edp_backlight_supported() - Check an eDP DPCD for VESA backlight support * @edp_dpcd: The DPCD to check * * Note that currently this function will return %false for panels which support various DPCD * backlight features but which require the brightness be set through PWM, and don't support setting * the brightness level via the DPCD. * * Returns: %True if @edp_dpcd indicates that VESA backlight controls are supported, %false * otherwise */ static inline bool drm_edp_backlight_supported(const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE]) { return !!(edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP); } /** * drm_dp_is_uhbr_rate - Determine if a link rate is UHBR * @link_rate: link rate in 10kbits/s units * * Determine if the provided link rate is an UHBR rate. * * Returns: %True if @link_rate is an UHBR rate. */ static inline bool drm_dp_is_uhbr_rate(int link_rate) { return link_rate >= 1000000; } /* * 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 cec_adapter; struct drm_connector; struct drm_edid; /** * struct drm_dp_aux_cec - DisplayPort CEC-Tunneling-over-AUX * @lock: mutex protecting this struct * @adap: the CEC adapter for CEC-Tunneling-over-AUX support. * @connector: the connector this CEC adapter is associated with * @unregister_work: unregister the CEC adapter */ struct drm_dp_aux_cec { struct mutex lock; struct cec_adapter *adap; struct drm_connector *connector; struct delayed_work unregister_work; }; /** * struct drm_dp_aux - DisplayPort AUX channel * * 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() function registers an I2C adapter * that can be passed to drm_probe_ddc(). Upon removal, drivers should call * drm_dp_aux_unregister() to remove the I2C adapter. The I2C adapter uses long * transfers by default; if a partial response is received, the adapter will * drop down to the size given by the partial response for this transaction * only. */ struct drm_dp_aux { /** * @name: user-visible name of this AUX channel and the * I2C-over-AUX adapter. * * It's also used to specify the name of the I2C adapter. If set * to %NULL, dev_name() of @dev will be used. */ const char *name; /** * @ddc: I2C adapter that can be used for I2C-over-AUX * communication */ struct i2c_adapter ddc; /** * @dev: pointer to struct device that is the parent for this * AUX channel. */ struct device *dev; /** * @drm_dev: pointer to the &drm_device that owns this AUX channel. * Beware, this may be %NULL before drm_dp_aux_register() has been * called. * * It should be set to the &drm_device that will be using this AUX * channel as early as possible. For many graphics drivers this should * happen before drm_dp_aux_init(), however it's perfectly fine to set * this field later so long as it's assigned before calling * drm_dp_aux_register(). */ struct drm_device *drm_dev; /** * @crtc: backpointer to the crtc that is currently using this * AUX channel */ struct drm_crtc *crtc; /** * @hw_mutex: internal mutex used for locking transfers. * * Note that if the underlying hardware is shared among multiple * channels, the driver needs to do additional locking to * prevent concurrent access. */ struct mutex hw_mutex; /** * @crc_work: worker that captures CRCs for each frame */ struct work_struct crc_work; /** * @crc_count: counter of captured frame CRCs */ u8 crc_count; /** * @transfer: transfers a message representing a single AUX * transaction. * * This is a hardware-specific implementation of how * transactions are executed that the drivers must provide. * * 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 will propagate these errors, 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. * * The @transfer() function must only modify the reply field of * the &drm_dp_aux_msg structure. The retry logic and i2c * helpers assume this is the case. * * Also note that this callback can be called no matter the * state @dev is in and also no matter what state the panel is * in. It's expected: * * - If the @dev providing the AUX bus is currently unpowered then * it will power itself up for the transfer. * * - If we're on eDP (using a drm_panel) and the panel is not in a * state where it can respond (it's not powered or it's in a * low power state) then this function may return an error, but * not crash. It's up to the caller of this code to make sure that * the panel is powered on if getting an error back is not OK. If a * drm_panel driver is initiating a DP AUX transfer it may power * itself up however it wants. All other code should ensure that * the pre_enable() bridge chain (which eventually calls the * drm_panel prepare function) has powered the panel. */ ssize_t (*transfer)(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg); /** * @wait_hpd_asserted: wait for HPD to be asserted * * This is mainly useful for eDP panels drivers to wait for an eDP * panel to finish powering on. It is optional for DP AUX controllers * to implement this function. It is required for DP AUX endpoints * (panel drivers) to call this function after powering up but before * doing AUX transfers unless the DP AUX endpoint driver knows that * we're not using the AUX controller's HPD. One example of the panel * driver not needing to call this is if HPD is hooked up to a GPIO * that the panel driver can read directly. * * If a DP AUX controller does not implement this function then it * may still support eDP panels that use the AUX controller's built-in * HPD signal by implementing a long wait for HPD in the transfer() * callback, though this is deprecated. * * This function will efficiently wait for the HPD signal to be * asserted. The `wait_us` parameter that is passed in says that we * know that the HPD signal is expected to be asserted within `wait_us` * microseconds. This function could wait for longer than `wait_us` if * the logic in the DP controller has a long debouncing time. The * important thing is that if this function returns success that the * DP controller is ready to send AUX transactions. * * This function returns 0 if HPD was asserted or -ETIMEDOUT if time * expired and HPD wasn't asserted. This function should not print * timeout errors to the log. * * The semantics of this function are designed to match the * readx_poll_timeout() function. That means a `wait_us` of 0 means * to wait forever. Like readx_poll_timeout(), this function may sleep. * * NOTE: this function specifically reports the state of the HPD pin * that's associated with the DP AUX channel. This is different from * the HPD concept in much of the rest of DRM which is more about * physical presence of a display. For eDP, for instance, a display is * assumed always present even if the HPD pin is deasserted. */ int (*wait_hpd_asserted)(struct drm_dp_aux *aux, unsigned long wait_us); /** * @i2c_nack_count: Counts I2C NACKs, used for DP validation. */ unsigned i2c_nack_count; /** * @i2c_defer_count: Counts I2C DEFERs, used for DP validation. */ unsigned i2c_defer_count; /** * @cec: struct containing fields used for CEC-Tunneling-over-AUX. */ struct drm_dp_aux_cec cec; /** * @is_remote: Is this AUX CH actually using sideband messaging. */ bool is_remote; /** * @powered_down: If true then the remote endpoint is powered down. */ bool powered_down; }; int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset); void drm_dp_dpcd_set_powered(struct drm_dp_aux *aux, bool powered); 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_read_dpcd_caps(struct drm_dp_aux *aux, u8 dpcd[DP_RECEIVER_CAP_SIZE]); int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, u8 status[DP_LINK_STATUS_SIZE]); int drm_dp_dpcd_read_phy_link_status(struct drm_dp_aux *aux, enum drm_dp_phy dp_phy, u8 link_status[DP_LINK_STATUS_SIZE]); bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux, u8 real_edid_checksum); int drm_dp_read_downstream_info(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE], u8 downstream_ports[DP_MAX_DOWNSTREAM_PORTS]); bool drm_dp_downstream_is_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4], u8 type); bool drm_dp_downstream_is_tmds(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4], const struct drm_edid *drm_edid); int drm_dp_downstream_max_dotclock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); int drm_dp_downstream_max_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4], const struct drm_edid *drm_edid); int drm_dp_downstream_min_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4], const struct drm_edid *drm_edid); int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4], const struct drm_edid *drm_edid); bool drm_dp_downstream_420_passthrough(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); bool drm_dp_downstream_444_to_420_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); struct drm_display_mode *drm_dp_downstream_mode(struct drm_device *dev, const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]); void drm_dp_downstream_debug(struct seq_file *m, const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4], const struct drm_edid *drm_edid, struct drm_dp_aux *aux); enum drm_mode_subconnector drm_dp_subconnector_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); void drm_dp_set_subconnector_property(struct drm_connector *connector, enum drm_connector_status status, const u8 *dpcd, const u8 port_cap[4]); struct drm_dp_desc; bool drm_dp_read_sink_count_cap(struct drm_connector *connector, const u8 dpcd[DP_RECEIVER_CAP_SIZE], const struct drm_dp_desc *desc); int drm_dp_read_sink_count(struct drm_dp_aux *aux); int drm_dp_read_lttpr_common_caps(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE], u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); int drm_dp_read_lttpr_phy_caps(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE], enum drm_dp_phy dp_phy, u8 caps[DP_LTTPR_PHY_CAP_SIZE]); int drm_dp_lttpr_count(const u8 cap[DP_LTTPR_COMMON_CAP_SIZE]); int drm_dp_lttpr_max_link_rate(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); int drm_dp_lttpr_max_lane_count(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); bool drm_dp_lttpr_voltage_swing_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); bool drm_dp_lttpr_pre_emphasis_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); void drm_dp_remote_aux_init(struct drm_dp_aux *aux); void drm_dp_aux_init(struct drm_dp_aux *aux); int drm_dp_aux_register(struct drm_dp_aux *aux); void drm_dp_aux_unregister(struct drm_dp_aux *aux); int drm_dp_start_crc(struct drm_dp_aux *aux, struct drm_crtc *crtc); int drm_dp_stop_crc(struct drm_dp_aux *aux); struct drm_dp_dpcd_ident { u8 oui[3]; u8 device_id[6]; u8 hw_rev; u8 sw_major_rev; u8 sw_minor_rev; } __packed; /** * struct drm_dp_desc - DP branch/sink device descriptor * @ident: DP device identification from DPCD 0x400 (sink) or 0x500 (branch). * @quirks: Quirks; use drm_dp_has_quirk() to query for the quirks. */ struct drm_dp_desc { struct drm_dp_dpcd_ident ident; u32 quirks; }; int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc, bool is_branch); int drm_dp_dump_lttpr_desc(struct drm_dp_aux *aux, enum drm_dp_phy dp_phy); /** * enum drm_dp_quirk - Display Port sink/branch device specific quirks * * Display Port sink and branch devices in the wild have a variety of bugs, try * to collect them here. The quirks are shared, but it's up to the drivers to * implement workarounds for them. */ enum drm_dp_quirk { /** * @DP_DPCD_QUIRK_CONSTANT_N: * * The device requires main link attributes Mvid and Nvid to be limited * to 16 bits. So will give a constant value (0x8000) for compatability. */ DP_DPCD_QUIRK_CONSTANT_N, /** * @DP_DPCD_QUIRK_NO_PSR: * * The device does not support PSR even if reports that it supports or * driver still need to implement proper handling for such device. */ DP_DPCD_QUIRK_NO_PSR, /** * @DP_DPCD_QUIRK_NO_SINK_COUNT: * * The device does not set SINK_COUNT to a non-zero value. * The driver should ignore SINK_COUNT during detection. Note that * drm_dp_read_sink_count_cap() automatically checks for this quirk. */ DP_DPCD_QUIRK_NO_SINK_COUNT, /** * @DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD: * * The device supports MST DSC despite not supporting Virtual DPCD. * The DSC caps can be read from the physical aux instead. */ DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD, /** * @DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS: * * The device supports a link rate of 3.24 Gbps (multiplier 0xc) despite * the DP_MAX_LINK_RATE register reporting a lower max multiplier. */ DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS, /** * @DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC: * * The device applies HBLANK expansion for some modes, but this * requires enabling DSC. */ DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC, }; /** * drm_dp_has_quirk() - does the DP device have a specific quirk * @desc: Device descriptor filled by drm_dp_read_desc() * @quirk: Quirk to query for * * Return true if DP device identified by @desc has @quirk. */ static inline bool drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk) { return desc->quirks & BIT(quirk); } /** * struct drm_edp_backlight_info - Probed eDP backlight info struct * @pwmgen_bit_count: The pwmgen bit count * @pwm_freq_pre_divider: The PWM frequency pre-divider value being used for this backlight, if any * @max: The maximum backlight level that may be set * @lsb_reg_used: Do we also write values to the DP_EDP_BACKLIGHT_BRIGHTNESS_LSB register? * @aux_enable: Does the panel support the AUX enable cap? * @aux_set: Does the panel support setting the brightness through AUX? * * This structure contains various data about an eDP backlight, which can be populated by using * drm_edp_backlight_init(). */ struct drm_edp_backlight_info { u8 pwmgen_bit_count; u8 pwm_freq_pre_divider; u16 max; bool lsb_reg_used : 1; bool aux_enable : 1; bool aux_set : 1; }; int drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl, u16 driver_pwm_freq_hz, const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE], u16 *current_level, u8 *current_mode); int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl, u16 level); int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl, u16 level); int drm_edp_backlight_disable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl); #if IS_ENABLED(CONFIG_DRM_KMS_HELPER) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \ (IS_MODULE(CONFIG_DRM_KMS_HELPER) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE))) int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux); #else static inline int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux) { return 0; } #endif #ifdef CONFIG_DRM_DISPLAY_DP_AUX_CEC void drm_dp_cec_irq(struct drm_dp_aux *aux); void drm_dp_cec_register_connector(struct drm_dp_aux *aux, struct drm_connector *connector); void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux); void drm_dp_cec_attach(struct drm_dp_aux *aux, u16 source_physical_address); void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid); void drm_dp_cec_unset_edid(struct drm_dp_aux *aux); #else static inline void drm_dp_cec_irq(struct drm_dp_aux *aux) { } static inline void drm_dp_cec_register_connector(struct drm_dp_aux *aux, struct drm_connector *connector) { } static inline void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux) { } static inline void drm_dp_cec_attach(struct drm_dp_aux *aux, u16 source_physical_address) { } static inline void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid) { } static inline void drm_dp_cec_unset_edid(struct drm_dp_aux *aux) { } #endif /** * struct drm_dp_phy_test_params - DP Phy Compliance parameters * @link_rate: Requested Link rate from DPCD 0x219 * @num_lanes: Number of lanes requested by sing through DPCD 0x220 * @phy_pattern: DP Phy test pattern from DPCD 0x248 * @hbr2_reset: DP HBR2_COMPLIANCE_SCRAMBLER_RESET from DCPD 0x24A and 0x24B * @custom80: DP Test_80BIT_CUSTOM_PATTERN from DPCDs 0x250 through 0x259 * @enhanced_frame_cap: flag for enhanced frame capability. */ struct drm_dp_phy_test_params { int link_rate; u8 num_lanes; u8 phy_pattern; u8 hbr2_reset[2]; u8 custom80[10]; bool enhanced_frame_cap; }; int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux, struct drm_dp_phy_test_params *data); int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux, struct drm_dp_phy_test_params *data, u8 dp_rev); int drm_dp_get_pcon_max_frl_bw(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd); bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux); int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps, u8 frl_mode); int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask, u8 frl_type); int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux); int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux); bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux); int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask); void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux, struct drm_connector *connector); bool drm_dp_pcon_enc_is_dsc_1_2(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); int drm_dp_pcon_dsc_max_slices(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); int drm_dp_pcon_dsc_max_slice_width(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); int drm_dp_pcon_dsc_bpp_incr(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); int drm_dp_pcon_pps_default(struct drm_dp_aux *aux); int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128]); int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6]); bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4], u8 color_spc); int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc); #define DRM_DP_BW_OVERHEAD_MST BIT(0) #define DRM_DP_BW_OVERHEAD_UHBR BIT(1) #define DRM_DP_BW_OVERHEAD_SSC_REF_CLK BIT(2) #define DRM_DP_BW_OVERHEAD_FEC BIT(3) #define DRM_DP_BW_OVERHEAD_DSC BIT(4) int drm_dp_bw_overhead(int lane_count, int hactive, int dsc_slice_count, int bpp_x16, unsigned long flags); int drm_dp_bw_channel_coding_efficiency(bool is_uhbr); int drm_dp_max_dprx_data_rate(int max_link_rate, int max_lanes); ssize_t drm_dp_vsc_sdp_pack(const struct drm_dp_vsc_sdp *vsc, struct dp_sdp *sdp); #endif /* _DRM_DP_HELPER_H_ */