| /* |
| * 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; |
| }; |
| |
| void drm_dp_vsc_sdp_log(const char *level, struct device *dev, |
| const struct drm_dp_vsc_sdp *vsc); |
| |
| 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_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; |
| } |
| |
| /* 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_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); |
| } |
| |
| /* |
| * 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 edid; |
| struct drm_connector; |
| |
| /** |
| * 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. This is an optional function. |
| * |
| * 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; |
| }; |
| |
| int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset); |
| 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 edid *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 edid *edid); |
| int drm_dp_downstream_min_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], |
| const u8 port_cap[4], |
| const struct edid *edid); |
| int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], |
| const u8 port_cap[4], |
| const struct edid *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 edid *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); |
| |
| /** |
| * 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, |
| }; |
| |
| /** |
| * 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_DP_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_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_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); |
| |
| #endif /* _DRM_DP_HELPER_H_ */ |