58 	struct drm_dp_aux *aux;  member
67  * levels to deal with Display Port sink devices and related things like DP aux
68  * channel transfers, EDID reading over DP aux channels, decoding certain DPCD
226 static int __8b10b_clock_recovery_delay_us(const struct drm_dp_aux *aux, u8 rd_interval)  in __8b10b_clock_recovery_delay_us()  argument
229 		drm_dbg_kms(aux->drm_dev, "%s: invalid AUX interval 0x%02x (max 4)\n",  in __8b10b_clock_recovery_delay_us()
230 			    aux->name, rd_interval);  in __8b10b_clock_recovery_delay_us()
238 static int __8b10b_channel_eq_delay_us(const struct drm_dp_aux *aux, u8 rd_interval)  in __8b10b_channel_eq_delay_us()  argument
241 		drm_dbg_kms(aux->drm_dev, "%s: invalid AUX interval 0x%02x (max 4)\n",  in __8b10b_channel_eq_delay_us()
242 			    aux->name, rd_interval);  in __8b10b_channel_eq_delay_us()
250 static int __128b132b_channel_eq_delay_us(const struct drm_dp_aux *aux, u8 rd_interval)  in __128b132b_channel_eq_delay_us()  argument
254 		drm_dbg_kms(aux->drm_dev, "%s: invalid AUX interval 0x%02x\n",  in __128b132b_channel_eq_delay_us()
255 			    aux->name, rd_interval);  in __128b132b_channel_eq_delay_us()
284 static int __read_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE],  in __read_delay()  argument
287 	int (*parse)(const struct drm_dp_aux *aux, u8 rd_interval);  in __read_delay()
328 		if (drm_dp_dpcd_readb(aux, offset, &rd_interval) != 1) {  in __read_delay()
329 			drm_dbg_kms(aux->drm_dev, "%s: failed rd interval read\n",  in __read_delay()
330 				    aux->name);  in __read_delay()
336 	return parse(aux, rd_interval & mask);  in __read_delay()
339 int drm_dp_read_clock_recovery_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE],  in drm_dp_read_clock_recovery_delay()  argument
342 	return __read_delay(aux, dpcd, dp_phy, uhbr, true);  in drm_dp_read_clock_recovery_delay()
346 int drm_dp_read_channel_eq_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE],  in drm_dp_read_channel_eq_delay()  argument
349 	return __read_delay(aux, dpcd, dp_phy, uhbr, false);  in drm_dp_read_channel_eq_delay()
354 int drm_dp_128b132b_read_aux_rd_interval(struct drm_dp_aux *aux)  in drm_dp_128b132b_read_aux_rd_interval()  argument
359 	if (drm_dp_dpcd_readb(aux, DP_128B132B_TRAINING_AUX_RD_INTERVAL, &val) != 1) {  in drm_dp_128b132b_read_aux_rd_interval()
360 		drm_err(aux->drm_dev, "%s: failed rd interval read\n",  in drm_dp_128b132b_read_aux_rd_interval()
361 			aux->name);  in drm_dp_128b132b_read_aux_rd_interval()
373 void drm_dp_link_train_clock_recovery_delay(const struct drm_dp_aux *aux,  in drm_dp_link_train_clock_recovery_delay()  argument
383 		delay_us = __8b10b_clock_recovery_delay_us(aux, rd_interval);  in drm_dp_link_train_clock_recovery_delay()
389 static void __drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux,  in __drm_dp_link_train_channel_eq_delay()  argument
392 	int delay_us = __8b10b_channel_eq_delay_us(aux, rd_interval);  in __drm_dp_link_train_channel_eq_delay()
397 void drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux,  in drm_dp_link_train_channel_eq_delay()  argument
400 	__drm_dp_link_train_channel_eq_delay(aux,  in drm_dp_link_train_channel_eq_delay()
449 void drm_dp_lttpr_link_train_channel_eq_delay(const struct drm_dp_aux *aux,  in drm_dp_lttpr_link_train_channel_eq_delay()  argument
456 	__drm_dp_link_train_channel_eq_delay(aux, interval);  in drm_dp_lttpr_link_train_channel_eq_delay()
495 drm_dp_dump_access(const struct drm_dp_aux *aux,  in drm_dp_dump_access()  argument
501 		drm_dbg_dp(aux->drm_dev, "%s: 0x%05x AUX %s (ret=%3d) %*ph\n",  in drm_dp_dump_access()
502 			   aux->name, offset, arrow, ret, min(ret, 20), buffer);  in drm_dp_dump_access()
504 		drm_dbg_dp(aux->drm_dev, "%s: 0x%05x AUX %s (ret=%3d)\n",  in drm_dp_dump_access()
505 			   aux->name, offset, arrow, ret);  in drm_dp_dump_access()
511  * The DisplayPort AUX channel is an abstraction to allow generic, driver-
512  * independent access to AUX functionality. Drivers can take advantage of
517  * Both native and I2C-over-AUX transactions are supported.
520 static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,  in drm_dp_dpcd_access()  argument
533 	mutex_lock(&aux->hw_mutex);  in drm_dp_dpcd_access()
538 	 * aux i2c transactions but real world devices this wasn't  in drm_dp_dpcd_access()
547 		ret = aux->transfer(aux, &msg);  in drm_dp_dpcd_access()
568 	drm_dbg_kms(aux->drm_dev, "%s: Too many retries, giving up. First error: %d\n",  in drm_dp_dpcd_access()
569 		    aux->name, err);  in drm_dp_dpcd_access()
573 	mutex_unlock(&aux->hw_mutex);  in drm_dp_dpcd_access()
579  * @aux: DisplayPort AUX channel (SST)
588 int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset)  in drm_dp_dpcd_probe()  argument
593 	ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset, &buffer, 1);  in drm_dp_dpcd_probe()
596 	drm_dp_dump_access(aux, DP_AUX_NATIVE_READ, offset, &buffer, ret);  in drm_dp_dpcd_probe()
604  * @aux: DisplayPort AUX channel (SST or MST)
612  * function returns -EPROTO. Errors from the underlying AUX channel transfer
616 ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,  in drm_dp_dpcd_read()  argument
633 	if (!aux->is_remote) {  in drm_dp_dpcd_read()
634 		ret = drm_dp_dpcd_probe(aux, DP_DPCD_REV);  in drm_dp_dpcd_read()
639 	if (aux->is_remote)  in drm_dp_dpcd_read()
640 		ret = drm_dp_mst_dpcd_read(aux, offset, buffer, size);  in drm_dp_dpcd_read()
642 		ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset,  in drm_dp_dpcd_read()
645 	drm_dp_dump_access(aux, DP_AUX_NATIVE_READ, offset, buffer, ret);  in drm_dp_dpcd_read()
652  * @aux: DisplayPort AUX channel (SST or MST)
660  * function returns -EPROTO. Errors from the underlying AUX channel transfer
664 ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset,  in drm_dp_dpcd_write()  argument
669 	if (aux->is_remote)  in drm_dp_dpcd_write()
670 		ret = drm_dp_mst_dpcd_write(aux, offset, buffer, size);  in drm_dp_dpcd_write()
672 		ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset,  in drm_dp_dpcd_write()
675 	drm_dp_dump_access(aux, DP_AUX_NATIVE_WRITE, offset, buffer, ret);  in drm_dp_dpcd_write()
682  * @aux: DisplayPort AUX channel
688 int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,  in drm_dp_dpcd_read_link_status()  argument
691 	return drm_dp_dpcd_read(aux, DP_LANE0_1_STATUS, status,  in drm_dp_dpcd_read_link_status()
698  * @aux: DisplayPort AUX channel
702  * Fetch the AUX DPCD registers for the DPRX or an LTTPR PHY link status. The
709 int drm_dp_dpcd_read_phy_link_status(struct drm_dp_aux *aux,  in drm_dp_dpcd_read_phy_link_status()  argument
716 		ret = drm_dp_dpcd_read(aux,  in drm_dp_dpcd_read_phy_link_status()
729 	ret = drm_dp_dpcd_read(aux,  in drm_dp_dpcd_read_phy_link_status()
815  * @aux: DisplayPort AUX channel
821 bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux,  in drm_dp_send_real_edid_checksum()  argument
826 	if (drm_dp_dpcd_read(aux, DP_DEVICE_SERVICE_IRQ_VECTOR,  in drm_dp_send_real_edid_checksum()
828 		drm_err(aux->drm_dev, "%s: DPCD failed read at register 0x%x\n",  in drm_dp_send_real_edid_checksum()
829 			aux->name, DP_DEVICE_SERVICE_IRQ_VECTOR);  in drm_dp_send_real_edid_checksum()
834 	if (drm_dp_dpcd_read(aux, DP_TEST_REQUEST, &link_edid_read, 1) < 1) {  in drm_dp_send_real_edid_checksum()
835 		drm_err(aux->drm_dev, "%s: DPCD failed read at register 0x%x\n",  in drm_dp_send_real_edid_checksum()
836 			aux->name, DP_TEST_REQUEST);  in drm_dp_send_real_edid_checksum()
842 		drm_dbg_kms(aux->drm_dev, "%s: Source DUT does not support TEST_EDID_READ\n",  in drm_dp_send_real_edid_checksum()
843 			    aux->name);  in drm_dp_send_real_edid_checksum()
847 	if (drm_dp_dpcd_write(aux, DP_DEVICE_SERVICE_IRQ_VECTOR,  in drm_dp_send_real_edid_checksum()
849 		drm_err(aux->drm_dev, "%s: DPCD failed write at register 0x%x\n",  in drm_dp_send_real_edid_checksum()
850 			aux->name, DP_DEVICE_SERVICE_IRQ_VECTOR);  in drm_dp_send_real_edid_checksum()
855 	if (drm_dp_dpcd_write(aux, DP_TEST_EDID_CHECKSUM,  in drm_dp_send_real_edid_checksum()
857 		drm_err(aux->drm_dev, "%s: DPCD failed write at register 0x%x\n",  in drm_dp_send_real_edid_checksum()
858 			aux->name, DP_TEST_EDID_CHECKSUM);  in drm_dp_send_real_edid_checksum()
863 	if (drm_dp_dpcd_write(aux, DP_TEST_RESPONSE, &test_resp, 1) < 1) {  in drm_dp_send_real_edid_checksum()
864 		drm_err(aux->drm_dev, "%s: DPCD failed write at register 0x%x\n",  in drm_dp_send_real_edid_checksum()
865 			aux->name, DP_TEST_RESPONSE);  in drm_dp_send_real_edid_checksum()
883 static int drm_dp_read_extended_dpcd_caps(struct drm_dp_aux *aux,  in drm_dp_read_extended_dpcd_caps()  argument
900 	ret = drm_dp_dpcd_read(aux, DP_DP13_DPCD_REV, &dpcd_ext,  in drm_dp_read_extended_dpcd_caps()
908 		drm_dbg_kms(aux->drm_dev,  in drm_dp_read_extended_dpcd_caps()
910 			    aux->name, dpcd[DP_DPCD_REV], dpcd_ext[DP_DPCD_REV]);  in drm_dp_read_extended_dpcd_caps()
917 	drm_dbg_kms(aux->drm_dev, "%s: Base DPCD: %*ph\n", aux->name, DP_RECEIVER_CAP_SIZE, dpcd);  in drm_dp_read_extended_dpcd_caps()
927  * @aux: DisplayPort AUX channel
930  * Attempts to read the base DPCD caps for @aux. Additionally, this function
937 int drm_dp_read_dpcd_caps(struct drm_dp_aux *aux,  in drm_dp_read_dpcd_caps()  argument
942 	ret = drm_dp_dpcd_read(aux, DP_DPCD_REV, dpcd, DP_RECEIVER_CAP_SIZE);  in drm_dp_read_dpcd_caps()
948 	ret = drm_dp_read_extended_dpcd_caps(aux, dpcd);  in drm_dp_read_dpcd_caps()
952 	drm_dbg_kms(aux->drm_dev, "%s: DPCD: %*ph\n", aux->name, DP_RECEIVER_CAP_SIZE, dpcd);  in drm_dp_read_dpcd_caps()
960  * @aux: DisplayPort AUX channel
971 int drm_dp_read_downstream_info(struct drm_dp_aux *aux,  in drm_dp_read_downstream_info()  argument
995 	ret = drm_dp_dpcd_read(aux, DP_DOWNSTREAM_PORT_0, downstream_ports, len);  in drm_dp_read_downstream_info()
1001 	drm_dbg_kms(aux->drm_dev, "%s: DPCD DFP: %*ph\n", aux->name, len, downstream_ports);  in drm_dp_read_downstream_info()
1349  * @aux: DisplayPort AUX channel
1354 int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6])  in drm_dp_downstream_id()  argument
1356 	return drm_dp_dpcd_read(aux, DP_BRANCH_ID, id, 6);  in drm_dp_downstream_id()
1366  * @aux: DisplayPort AUX channel
1373 			     struct drm_dp_aux *aux)  in drm_dp_downstream_debug()  argument
1418 	drm_dp_downstream_id(aux, id);  in drm_dp_downstream_debug()
1421 	len = drm_dp_dpcd_read(aux, DP_BRANCH_HW_REV, &rev[0], 1);  in drm_dp_downstream_debug()
1426 	len = drm_dp_dpcd_read(aux, DP_BRANCH_SW_REV, rev, 2);  in drm_dp_downstream_debug()
1553  * @aux: The DP AUX channel to use
1557  * Returns: The current sink count reported by @aux, or a negative error code
1560 int drm_dp_read_sink_count(struct drm_dp_aux *aux)  in drm_dp_read_sink_count()  argument
1565 	ret = drm_dp_dpcd_readb(aux, DP_SINK_COUNT, &count);  in drm_dp_read_sink_count()
1576  * I2C-over-AUX implementation
1609  * Calculate the duration of the AUX request/reply in usec. Gives the
1654 	/* AUX bitrate is 1MHz, i2c bitrate as specified */  in drm_dp_i2c_msg_duration()
1663  * i2c and AUX transfers.
1685  * Transfer a single I2C-over-AUX message and handle various error conditions,
1692 static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)  in drm_dp_i2c_do_msg()  argument
1699 	 * before giving up the AUX transaction.  in drm_dp_i2c_do_msg()
1706 		ret = aux->transfer(aux, msg);  in drm_dp_i2c_do_msg()
1718 				drm_dbg_kms_ratelimited(aux->drm_dev, "%s: transaction timed out\n",  in drm_dp_i2c_do_msg()
1719 							aux->name);  in drm_dp_i2c_do_msg()
1721 				drm_dbg_kms(aux->drm_dev, "%s: transaction failed: %d\n",  in drm_dp_i2c_do_msg()
1722 					    aux->name, ret);  in drm_dp_i2c_do_msg()
1730 			 * For I2C-over-AUX transactions this isn't enough, we  in drm_dp_i2c_do_msg()
1736 			drm_dbg_kms(aux->drm_dev, "%s: native nack (result=%d, size=%zu)\n",  in drm_dp_i2c_do_msg()
1737 				    aux->name, ret, msg->size);  in drm_dp_i2c_do_msg()
1741 			drm_dbg_kms(aux->drm_dev, "%s: native defer\n", aux->name);  in drm_dp_i2c_do_msg()
1755 			drm_err(aux->drm_dev, "%s: invalid native reply %#04x\n",  in drm_dp_i2c_do_msg()
1756 				aux->name, msg->reply);  in drm_dp_i2c_do_msg()
1771 			drm_dbg_kms(aux->drm_dev, "%s: I2C nack (result=%d, size=%zu)\n",  in drm_dp_i2c_do_msg()
1772 				    aux->name, ret, msg->size);  in drm_dp_i2c_do_msg()
1773 			aux->i2c_nack_count++;  in drm_dp_i2c_do_msg()
1777 			drm_dbg_kms(aux->drm_dev, "%s: I2C defer\n", aux->name);  in drm_dp_i2c_do_msg()
1782 			aux->i2c_defer_count++;  in drm_dp_i2c_do_msg()
1791 			drm_err(aux->drm_dev, "%s: invalid I2C reply %#04x\n",  in drm_dp_i2c_do_msg()
1792 				aux->name, msg->reply);  in drm_dp_i2c_do_msg()
1797 	drm_dbg_kms(aux->drm_dev, "%s: Too many retries, giving up\n", aux->name);  in drm_dp_i2c_do_msg()
1815 static int drm_dp_i2c_drain_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *orig_msg)  in drm_dp_i2c_drain_msg()  argument
1821 		err = drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_drain_msg()
1826 			drm_dbg_kms(aux->drm_dev,  in drm_dp_i2c_drain_msg()
1828 				    aux->name, msg.size, err);  in drm_dp_i2c_drain_msg()
1840  * Bizlink designed DP->DVI-D Dual Link adapters require the I2C over AUX
1847 		 "Number of bytes to transfer in a single I2C over DP AUX CH message, (1-16, default 16)");
1852 	struct drm_dp_aux *aux = adapter->algo_data;  in drm_dp_i2c_xfer()  local
1871 		err = drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_xfer()
1890 			err = drm_dp_i2c_drain_msg(aux, &msg);  in drm_dp_i2c_xfer()
1914 	(void)drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_xfer()
1950 static int drm_dp_aux_get_crc(struct drm_dp_aux *aux, u8 *crc)  in drm_dp_aux_get_crc()  argument
1955 	ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK, &buf);  in drm_dp_aux_get_crc()
1961 	ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK_MISC, &buf);  in drm_dp_aux_get_crc()
1966 	if (count == aux->crc_count)  in drm_dp_aux_get_crc()
1969 	aux->crc_count = count;  in drm_dp_aux_get_crc()
1975 	ret = drm_dp_dpcd_read(aux, DP_TEST_CRC_R_CR, crc, 6);  in drm_dp_aux_get_crc()
1984 	struct drm_dp_aux *aux = container_of(work, struct drm_dp_aux,  in drm_dp_aux_crc_work()  local
1991 	if (WARN_ON(!aux->crtc))  in drm_dp_aux_crc_work()
1994 	crtc = aux->crtc;  in drm_dp_aux_crc_work()
2000 		ret = drm_dp_aux_get_crc(aux, crc_bytes);  in drm_dp_aux_crc_work()
2003 			ret = drm_dp_aux_get_crc(aux, crc_bytes);  in drm_dp_aux_crc_work()
2007 			drm_dbg_kms(aux->drm_dev, "%s: Get CRC failed after retrying: %d\n",  in drm_dp_aux_crc_work()
2008 				    aux->name, ret);  in drm_dp_aux_crc_work()
2011 			drm_dbg_kms(aux->drm_dev, "%s: Failed to get a CRC: %d\n", aux->name, ret);  in drm_dp_aux_crc_work()
2023  * drm_dp_remote_aux_init() - minimally initialise a remote aux channel
2024  * @aux: DisplayPort AUX channel
2026  * Used for remote aux channel in general. Merely initialize the crc work
2029 void drm_dp_remote_aux_init(struct drm_dp_aux *aux)  in drm_dp_remote_aux_init()  argument
2031 	INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);  in drm_dp_remote_aux_init()
2036  * drm_dp_aux_init() - minimally initialise an aux channel
2037  * @aux: DisplayPort AUX channel
2041  * grandparents to their AUX adapters (e.g. the AUX adapter is parented by a
2045  * early as possible so that the &drm_device that corresponds to the AUX adapter
2048  * For devices which use a separate platform device for their AUX adapters, this
2052 void drm_dp_aux_init(struct drm_dp_aux *aux)  in drm_dp_aux_init()  argument
2054 	mutex_init(&aux->hw_mutex);  in drm_dp_aux_init()
2055 	mutex_init(&aux->cec.lock);  in drm_dp_aux_init()
2056 	INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);  in drm_dp_aux_init()
2058 	aux->ddc.algo = &drm_dp_i2c_algo;  in drm_dp_aux_init()
2059 	aux->ddc.algo_data = aux;  in drm_dp_aux_init()
2060 	aux->ddc.retries = 3;  in drm_dp_aux_init()
2062 	aux->ddc.lock_ops = &drm_dp_i2c_lock_ops;  in drm_dp_aux_init()
2067  * drm_dp_aux_register() - initialise and register aux channel
2068  * @aux: DisplayPort AUX channel
2071  * should only be called once the parent of @aux, &drm_dp_aux.dev, is
2072  * initialized. For devices which are grandparents of their AUX channels,
2074  * corresponds to @aux. For these devices, it's advised to call
2080  * For devices where the AUX channel is a device that exists independently of
2085  * with the AUX channel (e.g. on bridge detach).
2087  * Drivers which need to use the aux channel before either of the two points
2088  * mentioned above need to call drm_dp_aux_init() in order to use the AUX
2093 int drm_dp_aux_register(struct drm_dp_aux *aux)  in drm_dp_aux_register()  argument
2097 	WARN_ON_ONCE(!aux->drm_dev);  in drm_dp_aux_register()
2099 	if (!aux->ddc.algo)  in drm_dp_aux_register()
2100 		drm_dp_aux_init(aux);  in drm_dp_aux_register()
2102 	aux->ddc.class = I2C_CLASS_DDC;  in drm_dp_aux_register()
2103 	aux->ddc.owner = THIS_MODULE;  in drm_dp_aux_register()
2104 	aux->ddc.dev.parent = aux->dev;  in drm_dp_aux_register()
2106 	strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),  in drm_dp_aux_register()
2107 		sizeof(aux->ddc.name));  in drm_dp_aux_register()
2109 	ret = drm_dp_aux_register_devnode(aux);  in drm_dp_aux_register()
2113 	ret = i2c_add_adapter(&aux->ddc);  in drm_dp_aux_register()
2115 		drm_dp_aux_unregister_devnode(aux);  in drm_dp_aux_register()
2124  * drm_dp_aux_unregister() - unregister an AUX adapter
2125  * @aux: DisplayPort AUX channel
2127 void drm_dp_aux_unregister(struct drm_dp_aux *aux)  in drm_dp_aux_unregister()  argument
2129 	drm_dp_aux_unregister_devnode(aux);  in drm_dp_aux_unregister()
2130 	i2c_del_adapter(&aux->ddc);  in drm_dp_aux_unregister()
2169  * @aux: DisplayPort AUX channel
2174 int drm_dp_start_crc(struct drm_dp_aux *aux, struct drm_crtc *crtc)  in drm_dp_start_crc()  argument
2179 	ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK, &buf);  in drm_dp_start_crc()
2183 	ret = drm_dp_dpcd_writeb(aux, DP_TEST_SINK, buf | DP_TEST_SINK_START);  in drm_dp_start_crc()
2187 	aux->crc_count = 0;  in drm_dp_start_crc()
2188 	aux->crtc = crtc;  in drm_dp_start_crc()
2189 	schedule_work(&aux->crc_work);  in drm_dp_start_crc()
2197  * @aux: DisplayPort AUX channel
2201 int drm_dp_stop_crc(struct drm_dp_aux *aux)  in drm_dp_stop_crc()  argument
2206 	ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK, &buf);  in drm_dp_stop_crc()
2210 	ret = drm_dp_dpcd_writeb(aux, DP_TEST_SINK, buf & ~DP_TEST_SINK_START);  in drm_dp_stop_crc()
2214 	flush_work(&aux->crc_work);  in drm_dp_stop_crc()
2215 	aux->crtc = NULL;  in drm_dp_stop_crc()
2291  * @aux: DisplayPort AUX channel
2300 int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,  in drm_dp_read_desc()  argument
2307 	ret = drm_dp_dpcd_read(aux, offset, ident, sizeof(*ident));  in drm_dp_read_desc()
2315 	drm_dbg_kms(aux->drm_dev,  in drm_dp_read_desc()
2317 		    aux->name, is_branch ? "branch" : "sink",  in drm_dp_read_desc()
2463 static int drm_dp_read_lttpr_regs(struct drm_dp_aux *aux,  in drm_dp_read_lttpr_regs()  argument
2477 		ret = drm_dp_dpcd_read(aux,  in drm_dp_read_lttpr_regs()
2491  * @aux: DisplayPort AUX channel
2499 int drm_dp_read_lttpr_common_caps(struct drm_dp_aux *aux,  in drm_dp_read_lttpr_common_caps()  argument
2503 	return drm_dp_read_lttpr_regs(aux, dpcd,  in drm_dp_read_lttpr_common_caps()
2511  * @aux: DisplayPort AUX channel
2520 int drm_dp_read_lttpr_phy_caps(struct drm_dp_aux *aux,  in drm_dp_read_lttpr_phy_caps()  argument
2525 	return drm_dp_read_lttpr_regs(aux, dpcd,  in drm_dp_read_lttpr_phy_caps()
2626  * @aux: DisplayPort AUX channel
2631 int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux,  in drm_dp_get_phy_test_pattern()  argument
2637 	err = drm_dp_dpcd_readb(aux, DP_TEST_LINK_RATE, &rate);  in drm_dp_get_phy_test_pattern()
2642 	err = drm_dp_dpcd_readb(aux, DP_TEST_LANE_COUNT, &lanes);  in drm_dp_get_phy_test_pattern()
2650 	err = drm_dp_dpcd_readb(aux, DP_PHY_TEST_PATTERN, &data->phy_pattern);  in drm_dp_get_phy_test_pattern()
2656 		err = drm_dp_dpcd_read(aux, DP_TEST_80BIT_CUSTOM_PATTERN_7_0,  in drm_dp_get_phy_test_pattern()
2663 		err = drm_dp_dpcd_read(aux, DP_TEST_HBR2_SCRAMBLER_RESET,  in drm_dp_get_phy_test_pattern()
2676  * @aux: DisplayPort AUX channel
2682 int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux,  in drm_dp_set_phy_test_pattern()  argument
2692 		err = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET,  in drm_dp_set_phy_test_pattern()
2698 			err = drm_dp_dpcd_writeb(aux,  in drm_dp_set_phy_test_pattern()
2925  * @aux: DisplayPort AUX channel
2930 int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd)  in drm_dp_pcon_frl_prepare()  argument
2939 	ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf);  in drm_dp_pcon_frl_prepare()
2947  * @aux: DisplayPort AUX channel
2951 bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux)  in drm_dp_pcon_is_frl_ready()  argument
2956 	ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_TX_LINK_STATUS, &buf);  in drm_dp_pcon_is_frl_ready()
2969  * @aux: DisplayPort AUX channel
2979 int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps,  in drm_dp_pcon_frl_configure_1()  argument
2985 	ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_LINK_CONFIG_1, &buf);  in drm_dp_pcon_frl_configure_1()
3020 	ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf);  in drm_dp_pcon_frl_configure_1()
3030  * @aux: DisplayPort AUX channel
3039 int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask,  in drm_dp_pcon_frl_configure_2()  argument
3050 	ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_2, buf);  in drm_dp_pcon_frl_configure_2()
3060  * @aux: DisplayPort AUX channel
3064 int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux)  in drm_dp_pcon_reset_frl_config()  argument
3068 	ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, 0x0);  in drm_dp_pcon_reset_frl_config()
3078  * @aux: DisplayPort AUX channel
3082 int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux)  in drm_dp_pcon_frl_enable()  argument
3087 	ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_LINK_CONFIG_1, &buf);  in drm_dp_pcon_frl_enable()
3091 		drm_dbg_kms(aux->drm_dev, "%s: PCON in Autonomous mode, can't enable FRL\n",  in drm_dp_pcon_frl_enable()
3092 			    aux->name);  in drm_dp_pcon_frl_enable()
3096 	ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf);  in drm_dp_pcon_frl_enable()
3106  * @aux: DisplayPort AUX channel
3110 bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux)  in drm_dp_pcon_hdmi_link_active()  argument
3115 	ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_TX_LINK_STATUS, &buf);  in drm_dp_pcon_hdmi_link_active()
3125  * @aux: DisplayPort AUX channel
3134 int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask)  in drm_dp_pcon_hdmi_link_mode()  argument
3140 	ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_POST_FRL_STATUS, &buf);  in drm_dp_pcon_hdmi_link_mode()
3156  * @aux: DisplayPort AUX channel
3161 void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux,  in drm_dp_pcon_hdmi_frl_link_error_count()  argument
3169 		if (drm_dp_dpcd_readb(aux, DP_PCON_HDMI_ERROR_STATUS_LN0 + i, &buf) < 0)  in drm_dp_pcon_hdmi_frl_link_error_count()
3187 		drm_err(aux->drm_dev, "%s: More than %d errors since the last read for lane %d",  in drm_dp_pcon_hdmi_frl_link_error_count()
3188 			aux->name, num_error, i);  in drm_dp_pcon_hdmi_frl_link_error_count()
3299 int drm_dp_pcon_configure_dsc_enc(struct drm_dp_aux *aux, u8 pps_buf_config)  in drm_dp_pcon_configure_dsc_enc()  argument
3304 	ret = drm_dp_dpcd_readb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, &buf);  in drm_dp_pcon_configure_dsc_enc()
3315 	ret = drm_dp_dpcd_writeb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, buf);  in drm_dp_pcon_configure_dsc_enc()
3325  * @aux: DisplayPort AUX channel
3329 int drm_dp_pcon_pps_default(struct drm_dp_aux *aux)  in drm_dp_pcon_pps_default()  argument
3333 	ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_DISABLED);  in drm_dp_pcon_pps_default()
3344  * @aux: DisplayPort AUX channel
3349 int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128])  in drm_dp_pcon_pps_override_buf()  argument
3353 	ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVERRIDE_BASE, &pps_buf, 128);  in drm_dp_pcon_pps_override_buf()
3357 	ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);  in drm_dp_pcon_pps_override_buf()
3368  * @aux: DisplayPort AUX channel
3374 int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6])  in drm_dp_pcon_pps_override_param()  argument
3378 	ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_SLICE_HEIGHT, &pps_param[0], 2);  in drm_dp_pcon_pps_override_param()
3381 	ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_SLICE_WIDTH, &pps_param[2], 2);  in drm_dp_pcon_pps_override_param()
3384 	ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_BPP, &pps_param[4], 2);  in drm_dp_pcon_pps_override_param()
3388 	ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);  in drm_dp_pcon_pps_override_param()
3398  * @aux: displayPort AUX channel
3403 int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc)  in drm_dp_pcon_convert_rgb_to_ycbcr()  argument
3408 	ret = drm_dp_dpcd_readb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, &buf);  in drm_dp_pcon_convert_rgb_to_ycbcr()
3417 	ret = drm_dp_dpcd_writeb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, buf);  in drm_dp_pcon_convert_rgb_to_ycbcr()
3426  * drm_edp_backlight_set_level() - Set the backlight level of an eDP panel via AUX
3427  * @aux: The DP AUX channel to use
3436 int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,  in drm_edp_backlight_set_level()  argument
3453 	ret = drm_dp_dpcd_write(aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, buf, sizeof(buf));  in drm_edp_backlight_set_level()
3455 		drm_err(aux->drm_dev,  in drm_edp_backlight_set_level()
3456 			"%s: Failed to write aux backlight level: %d\n",  in drm_edp_backlight_set_level()
3457 			aux->name, ret);  in drm_edp_backlight_set_level()
3466 drm_edp_backlight_set_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,  in drm_edp_backlight_set_enable()  argument
3476 	ret = drm_dp_dpcd_readb(aux, DP_EDP_DISPLAY_CONTROL_REGISTER, &buf);  in drm_edp_backlight_set_enable()
3478 		drm_err(aux->drm_dev, "%s: Failed to read eDP display control register: %d\n",  in drm_edp_backlight_set_enable()
3479 			aux->name, ret);  in drm_edp_backlight_set_enable()
3487 	ret = drm_dp_dpcd_writeb(aux, DP_EDP_DISPLAY_CONTROL_REGISTER, buf);  in drm_edp_backlight_set_enable()
3489 		drm_err(aux->drm_dev, "%s: Failed to write eDP display control register: %d\n",  in drm_edp_backlight_set_enable()
3490 			aux->name, ret);  in drm_edp_backlight_set_enable()
3499  * @aux: The DP AUX channel to use
3501  * @level: The initial backlight level to set via AUX, if there is one
3515 int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,  in drm_edp_backlight_enable()  argument
3527 		ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count);  in drm_edp_backlight_enable()
3529 			drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n",  in drm_edp_backlight_enable()
3530 				    aux->name, ret);  in drm_edp_backlight_enable()
3534 		ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_FREQ_SET, bl->pwm_freq_pre_divider);  in drm_edp_backlight_enable()
3536 			drm_dbg_kms(aux->drm_dev,  in drm_edp_backlight_enable()
3537 				    "%s: Failed to write aux backlight frequency: %d\n",  in drm_edp_backlight_enable()
3538 				    aux->name, ret);  in drm_edp_backlight_enable()
3543 	ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, dpcd_buf);  in drm_edp_backlight_enable()
3545 		drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux backlight mode: %d\n",  in drm_edp_backlight_enable()
3546 			    aux->name, ret);  in drm_edp_backlight_enable()
3550 	ret = drm_edp_backlight_set_level(aux, bl, level);  in drm_edp_backlight_enable()
3553 	ret = drm_edp_backlight_set_enable(aux, bl, true);  in drm_edp_backlight_enable()
3563  * @aux: The DP AUX channel to use
3566  * This function handles disabling DPCD backlight controls on a panel over AUX.
3576 int drm_edp_backlight_disable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl)  in drm_edp_backlight_disable()  argument
3580 	ret = drm_edp_backlight_set_enable(aux, bl, false);  in drm_edp_backlight_disable()
3589 drm_edp_backlight_probe_max(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,  in drm_edp_backlight_probe_max()  argument
3599 	ret = drm_dp_dpcd_readb(aux, DP_EDP_PWMGEN_BIT_COUNT, &pn);  in drm_edp_backlight_probe_max()
3601 		drm_dbg_kms(aux->drm_dev, "%s: Failed to read pwmgen bit count cap: %d\n",  in drm_edp_backlight_probe_max()
3602 			    aux->name, ret);  in drm_edp_backlight_probe_max()
3633 	ret = drm_dp_dpcd_readb(aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MIN, &pn_min);  in drm_edp_backlight_probe_max()
3635 		drm_dbg_kms(aux->drm_dev, "%s: Failed to read pwmgen bit count cap min: %d\n",  in drm_edp_backlight_probe_max()
3636 			    aux->name, ret);  in drm_edp_backlight_probe_max()
3639 	ret = drm_dp_dpcd_readb(aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MAX, &pn_max);  in drm_edp_backlight_probe_max()
3641 		drm_dbg_kms(aux->drm_dev, "%s: Failed to read pwmgen bit count cap max: %d\n",  in drm_edp_backlight_probe_max()
3642 			    aux->name, ret);  in drm_edp_backlight_probe_max()
3652 		drm_dbg_kms(aux->drm_dev,  in drm_edp_backlight_probe_max()
3654 			    aux->name, driver_pwm_freq_hz);  in drm_edp_backlight_probe_max()
3665 	ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, pn);  in drm_edp_backlight_probe_max()
3667 		drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n",  in drm_edp_backlight_probe_max()
3668 			    aux->name, ret);  in drm_edp_backlight_probe_max()
3676 		drm_dbg_kms(aux->drm_dev, "%s: Using backlight frequency from driver (%dHz)\n",  in drm_edp_backlight_probe_max()
3677 			    aux->name, driver_pwm_freq_hz);  in drm_edp_backlight_probe_max()
3684 drm_edp_backlight_probe_state(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,  in drm_edp_backlight_probe_state()  argument
3691 	ret = drm_dp_dpcd_readb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &mode_reg);  in drm_edp_backlight_probe_state()
3693 		drm_dbg_kms(aux->drm_dev, "%s: Failed to read backlight mode: %d\n",  in drm_edp_backlight_probe_state()
3694 			    aux->name, ret);  in drm_edp_backlight_probe_state()
3705 		ret = drm_dp_dpcd_read(aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, buf, size);  in drm_edp_backlight_probe_state()
3707 			drm_dbg_kms(aux->drm_dev, "%s: Failed to read backlight level: %d\n",  in drm_edp_backlight_probe_state()
3708 				    aux->name, ret);  in drm_edp_backlight_probe_state()
3728  * @aux: The DP aux device to use for probing
3735  * Initializes a &drm_edp_backlight_info struct by probing @aux for it's backlight capabilities,
3744 drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,  in drm_edp_backlight_init()  argument
3759 		drm_dbg_kms(aux->drm_dev,  in drm_edp_backlight_init()
3760 			    "%s: Panel supports neither AUX or PWM brightness control? Aborting\n",  in drm_edp_backlight_init()
3761 			    aux->name);  in drm_edp_backlight_init()
3765 	ret = drm_edp_backlight_probe_max(aux, bl, driver_pwm_freq_hz, edp_dpcd);  in drm_edp_backlight_init()
3769 	ret = drm_edp_backlight_probe_state(aux, bl, current_mode);  in drm_edp_backlight_init()
3774 	drm_dbg_kms(aux->drm_dev,  in drm_edp_backlight_init()
3776 		    aux->name, bl->aux_set, bl->aux_enable, *current_mode);  in drm_edp_backlight_init()
3778 		drm_dbg_kms(aux->drm_dev,  in drm_edp_backlight_init()
3780 			    aux->name, *current_level, bl->max, bl->pwm_freq_pre_divider,  in drm_edp_backlight_init()
3799 			drm_edp_backlight_enable(bl->aux, &bl->info, brightness);  in dp_aux_backlight_update_status()
3803 		ret = drm_edp_backlight_set_level(bl->aux, &bl->info, brightness);  in dp_aux_backlight_update_status()
3806 			drm_edp_backlight_disable(bl->aux, &bl->info);  in dp_aux_backlight_update_status()
3819  * drm_panel_dp_aux_backlight - create and use DP AUX backlight
3821  * @aux: The DP AUX channel to use
3824  * supports backlight control over DP AUX channel using DPCD
3834  * control over DP AUX will call this function at probe time.
3842 int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux)  in drm_panel_dp_aux_backlight()  argument
3851 	if (!panel || !panel->dev || !aux)  in drm_panel_dp_aux_backlight()
3854 	ret = drm_dp_dpcd_read(aux, DP_EDP_DPCD_REV, edp_dpcd,  in drm_panel_dp_aux_backlight()
3860 		DRM_DEV_INFO(panel->dev, "DP AUX backlight is not supported\n");  in drm_panel_dp_aux_backlight()
3868 	bl->aux = aux;  in drm_panel_dp_aux_backlight()
3870 	ret = drm_edp_backlight_init(aux, &bl->info, 0, edp_dpcd,  in drm_panel_dp_aux_backlight()