2 * Copyright 2007-8 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
23 * Authors: Dave Airlie
27 #include "radeon_drm.h"
31 #include "atom-bits.h"
32 #include "drm_dp_helper.h"
34 /* move these to drm_dp_helper.c/h */
35 #define DP_LINK_CONFIGURATION_SIZE 9
36 #define DP_LINK_STATUS_SIZE 6
37 #define DP_DPCD_SIZE 8
39 static char *voltage_names[] = {
40 "0.4V", "0.6V", "0.8V", "1.2V"
42 static char *pre_emph_names[] = {
43 "0dB", "3.5dB", "6dB", "9.5dB"
46 static const int dp_clocks[] = {
47 54000, /* 1 lane, 1.62 Ghz */
48 90000, /* 1 lane, 2.70 Ghz */
49 108000, /* 2 lane, 1.62 Ghz */
50 180000, /* 2 lane, 2.70 Ghz */
51 216000, /* 4 lane, 1.62 Ghz */
52 360000, /* 4 lane, 2.70 Ghz */
55 static const int num_dp_clocks = sizeof(dp_clocks) / sizeof(int);
57 /* common helper functions */
58 static int dp_lanes_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
67 max_link_bw = dpcd[DP_MAX_LINK_RATE];
68 max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
70 switch (max_link_bw) {
73 for (i = 0; i < num_dp_clocks; i++) {
76 switch (max_lane_count) {
89 if (dp_clocks[i] > mode_clock) {
100 for (i = 0; i < num_dp_clocks; i++) {
101 switch (max_lane_count) {
114 if (dp_clocks[i] > mode_clock) {
129 static int dp_link_clock_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
138 max_link_bw = dpcd[DP_MAX_LINK_RATE];
139 max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
141 switch (max_link_bw) {
142 case DP_LINK_BW_1_62:
144 for (i = 0; i < num_dp_clocks; i++) {
147 switch (max_lane_count) {
160 if (dp_clocks[i] > mode_clock)
165 for (i = 0; i < num_dp_clocks; i++) {
166 switch (max_lane_count) {
179 if (dp_clocks[i] > mode_clock)
180 return (i % 2) ? 270000 : 162000;
187 int dp_mode_valid(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
189 int lanes = dp_lanes_for_mode_clock(dpcd, mode_clock);
190 int bw = dp_lanes_for_mode_clock(dpcd, mode_clock);
192 if ((lanes == 0) || (bw == 0))
193 return MODE_CLOCK_HIGH;
198 static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r)
200 return link_status[r - DP_LANE0_1_STATUS];
203 static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE],
206 int i = DP_LANE0_1_STATUS + (lane >> 1);
207 int s = (lane & 1) * 4;
208 u8 l = dp_link_status(link_status, i);
209 return (l >> s) & 0xf;
212 static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
218 for (lane = 0; lane < lane_count; lane++) {
219 lane_status = dp_get_lane_status(link_status, lane);
220 if ((lane_status & DP_LANE_CR_DONE) == 0)
226 static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
233 lane_align = dp_link_status(link_status,
234 DP_LANE_ALIGN_STATUS_UPDATED);
235 if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
237 for (lane = 0; lane < lane_count; lane++) {
238 lane_status = dp_get_lane_status(link_status, lane);
239 if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
245 static u8 dp_get_adjust_request_voltage(uint8_t link_status[DP_LINK_STATUS_SIZE],
249 int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
250 int s = ((lane & 1) ?
251 DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
252 DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
253 u8 l = dp_link_status(link_status, i);
255 return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
258 static u8 dp_get_adjust_request_pre_emphasis(uint8_t link_status[DP_LINK_STATUS_SIZE],
261 int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
262 int s = ((lane & 1) ?
263 DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
264 DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
265 u8 l = dp_link_status(link_status, i);
267 return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
270 /* XXX fix me -- chip specific */
271 #define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_1200
272 static u8 dp_pre_emphasis_max(u8 voltage_swing)
274 switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
275 case DP_TRAIN_VOLTAGE_SWING_400:
276 return DP_TRAIN_PRE_EMPHASIS_6;
277 case DP_TRAIN_VOLTAGE_SWING_600:
278 return DP_TRAIN_PRE_EMPHASIS_6;
279 case DP_TRAIN_VOLTAGE_SWING_800:
280 return DP_TRAIN_PRE_EMPHASIS_3_5;
281 case DP_TRAIN_VOLTAGE_SWING_1200:
283 return DP_TRAIN_PRE_EMPHASIS_0;
287 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
295 for (lane = 0; lane < lane_count; lane++) {
296 u8 this_v = dp_get_adjust_request_voltage(link_status, lane);
297 u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
299 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
301 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
302 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
310 if (v >= DP_VOLTAGE_MAX)
311 v = DP_VOLTAGE_MAX | DP_TRAIN_MAX_SWING_REACHED;
313 if (p >= dp_pre_emphasis_max(v))
314 p = dp_pre_emphasis_max(v) | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
316 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
317 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
318 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
320 for (lane = 0; lane < 4; lane++)
321 train_set[lane] = v | p;
324 union aux_channel_transaction {
325 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
326 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
329 /* radeon aux chan functions */
330 bool radeon_process_aux_ch(struct radeon_i2c_chan *chan, u8 *req_bytes,
331 int num_bytes, u8 *read_byte,
332 u8 read_buf_len, u8 delay)
334 struct drm_device *dev = chan->dev;
335 struct radeon_device *rdev = dev->dev_private;
336 union aux_channel_transaction args;
337 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
341 memset(&args, 0, sizeof(args));
343 base = (unsigned char *)rdev->mode_info.atom_context->scratch;
346 memcpy(base, req_bytes, num_bytes);
348 args.v1.lpAuxRequest = 0;
349 args.v1.lpDataOut = 16;
350 args.v1.ucDataOutLen = 0;
351 args.v1.ucChannelID = chan->rec.i2c_id;
352 args.v1.ucDelay = delay / 10;
353 if (ASIC_IS_DCE4(rdev))
354 args.v2.ucHPD_ID = chan->rec.hpd;
356 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
358 if (args.v1.ucReplyStatus && !args.v1.ucDataOutLen) {
359 if (args.v1.ucReplyStatus == 0x20 && retry_count++ < 10)
361 DRM_DEBUG_KMS("failed to get auxch %02x%02x %02x %02x 0x%02x %02x after %d retries\n",
362 req_bytes[1], req_bytes[0], req_bytes[2], req_bytes[3],
363 chan->rec.i2c_id, args.v1.ucReplyStatus, retry_count);
367 if (args.v1.ucDataOutLen && read_byte && read_buf_len) {
368 if (read_buf_len < args.v1.ucDataOutLen) {
369 DRM_ERROR("Buffer to small for return answer %d %d\n",
370 read_buf_len, args.v1.ucDataOutLen);
374 int len = min(read_buf_len, args.v1.ucDataOutLen);
375 memcpy(read_byte, base + 16, len);
381 bool radeon_dp_aux_native_write(struct radeon_connector *radeon_connector, uint16_t address,
382 uint8_t send_bytes, uint8_t *send)
384 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
386 u8 msg_len, dp_msg_len;
391 msg[1] = address >> 8;
392 msg[2] = AUX_NATIVE_WRITE << 4;
393 dp_msg_len += send_bytes;
394 msg[3] = (dp_msg_len << 4) | (send_bytes - 1);
399 memcpy(&msg[4], send, send_bytes);
400 msg_len = 4 + send_bytes;
401 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, NULL, 0, 0);
405 bool radeon_dp_aux_native_read(struct radeon_connector *radeon_connector, uint16_t address,
406 uint8_t delay, uint8_t expected_bytes,
409 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
411 u8 msg_len, dp_msg_len;
416 msg[1] = address >> 8;
417 msg[2] = AUX_NATIVE_READ << 4;
418 msg[3] = (dp_msg_len) << 4;
419 msg[3] |= expected_bytes - 1;
421 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, read_p, expected_bytes, delay);
425 /* radeon dp functions */
426 static u8 radeon_dp_encoder_service(struct radeon_device *rdev, int action, int dp_clock,
427 uint8_t ucconfig, uint8_t lane_num)
429 DP_ENCODER_SERVICE_PARAMETERS args;
430 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
432 memset(&args, 0, sizeof(args));
433 args.ucLinkClock = dp_clock / 10;
434 args.ucConfig = ucconfig;
435 args.ucAction = action;
436 args.ucLaneNum = lane_num;
439 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
440 return args.ucStatus;
443 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
445 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
446 struct drm_device *dev = radeon_connector->base.dev;
447 struct radeon_device *rdev = dev->dev_private;
449 return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
450 dig_connector->dp_i2c_bus->rec.i2c_id, 0);
453 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
455 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
459 ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, 0, 8, msg);
461 memcpy(dig_connector->dpcd, msg, 8);
464 DRM_DEBUG_KMS("DPCD: ");
465 for (i = 0; i < 8; i++)
466 DRM_DEBUG_KMS("%02x ", msg[i]);
471 dig_connector->dpcd[0] = 0;
475 void radeon_dp_set_link_config(struct drm_connector *connector,
476 struct drm_display_mode *mode)
478 struct radeon_connector *radeon_connector;
479 struct radeon_connector_atom_dig *dig_connector;
481 if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) &&
482 (connector->connector_type != DRM_MODE_CONNECTOR_eDP))
485 radeon_connector = to_radeon_connector(connector);
486 if (!radeon_connector->con_priv)
488 dig_connector = radeon_connector->con_priv;
490 dig_connector->dp_clock =
491 dp_link_clock_for_mode_clock(dig_connector->dpcd, mode->clock);
492 dig_connector->dp_lane_count =
493 dp_lanes_for_mode_clock(dig_connector->dpcd, mode->clock);
496 int radeon_dp_mode_valid_helper(struct radeon_connector *radeon_connector,
497 struct drm_display_mode *mode)
499 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
501 return dp_mode_valid(dig_connector->dpcd, mode->clock);
504 static bool atom_dp_get_link_status(struct radeon_connector *radeon_connector,
505 u8 link_status[DP_LINK_STATUS_SIZE])
508 ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS, 100,
509 DP_LINK_STATUS_SIZE, link_status);
511 DRM_ERROR("displayport link status failed\n");
515 DRM_DEBUG_KMS("link status %02x %02x %02x %02x %02x %02x\n",
516 link_status[0], link_status[1], link_status[2],
517 link_status[3], link_status[4], link_status[5]);
521 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
523 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
524 u8 link_status[DP_LINK_STATUS_SIZE];
526 if (!atom_dp_get_link_status(radeon_connector, link_status))
528 if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count))
533 static void dp_set_power(struct radeon_connector *radeon_connector, u8 power_state)
535 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
537 if (dig_connector->dpcd[0] >= 0x11) {
538 radeon_dp_aux_native_write(radeon_connector, DP_SET_POWER, 1,
543 static void dp_set_downspread(struct radeon_connector *radeon_connector, u8 downspread)
545 radeon_dp_aux_native_write(radeon_connector, DP_DOWNSPREAD_CTRL, 1,
549 static void dp_set_link_bw_lanes(struct radeon_connector *radeon_connector,
550 u8 link_configuration[DP_LINK_CONFIGURATION_SIZE])
552 radeon_dp_aux_native_write(radeon_connector, DP_LINK_BW_SET, 2,
556 static void dp_update_dpvs_emph(struct radeon_connector *radeon_connector,
557 struct drm_encoder *encoder,
560 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
563 for (i = 0; i < dig_connector->dp_lane_count; i++)
564 atombios_dig_transmitter_setup(encoder,
565 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
568 radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_LANE0_SET,
569 dig_connector->dp_lane_count, train_set);
572 static void dp_set_training(struct radeon_connector *radeon_connector,
575 radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_PATTERN_SET,
579 void dp_link_train(struct drm_encoder *encoder,
580 struct drm_connector *connector)
582 struct drm_device *dev = encoder->dev;
583 struct radeon_device *rdev = dev->dev_private;
584 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
585 struct radeon_encoder_atom_dig *dig;
586 struct radeon_connector *radeon_connector;
587 struct radeon_connector_atom_dig *dig_connector;
589 bool clock_recovery, channel_eq;
590 u8 link_status[DP_LINK_STATUS_SIZE];
591 u8 link_configuration[DP_LINK_CONFIGURATION_SIZE];
596 if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) &&
597 (connector->connector_type != DRM_MODE_CONNECTOR_eDP))
600 if (!radeon_encoder->enc_priv)
602 dig = radeon_encoder->enc_priv;
604 radeon_connector = to_radeon_connector(connector);
605 if (!radeon_connector->con_priv)
607 dig_connector = radeon_connector->con_priv;
609 if (dig->dig_encoder)
610 enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
612 enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
613 if (dig_connector->linkb)
614 enc_id |= ATOM_DP_CONFIG_LINK_B;
616 enc_id |= ATOM_DP_CONFIG_LINK_A;
618 memset(link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
619 if (dig_connector->dp_clock == 270000)
620 link_configuration[0] = DP_LINK_BW_2_7;
622 link_configuration[0] = DP_LINK_BW_1_62;
623 link_configuration[1] = dig_connector->dp_lane_count;
624 if (dig_connector->dpcd[0] >= 0x11)
625 link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
627 /* power up the sink */
628 dp_set_power(radeon_connector, DP_SET_POWER_D0);
629 /* disable the training pattern on the sink */
630 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
631 /* set link bw and lanes on the sink */
632 dp_set_link_bw_lanes(radeon_connector, link_configuration);
633 /* disable downspread on the sink */
634 dp_set_downspread(radeon_connector, 0);
635 if (ASIC_IS_DCE4(rdev)) {
636 /* start training on the source */
637 atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_LINK_TRAINING_START);
638 /* set training pattern 1 on the source */
639 atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1);
641 /* start training on the source */
642 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_START,
643 dig_connector->dp_clock, enc_id, 0);
644 /* set training pattern 1 on the source */
645 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
646 dig_connector->dp_clock, enc_id, 0);
649 /* set initial vs/emph */
650 memset(train_set, 0, 4);
652 /* set training pattern 1 on the sink */
653 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_1);
655 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
657 /* clock recovery loop */
658 clock_recovery = false;
663 if (!atom_dp_get_link_status(radeon_connector, link_status))
666 if (dp_clock_recovery_ok(link_status, dig_connector->dp_lane_count)) {
667 clock_recovery = true;
671 for (i = 0; i < dig_connector->dp_lane_count; i++) {
672 if ((train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
675 if (i == dig_connector->dp_lane_count) {
676 DRM_ERROR("clock recovery reached max voltage\n");
680 if ((train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
683 DRM_ERROR("clock recovery tried 5 times\n");
689 voltage = train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
691 /* Compute new train_set as requested by sink */
692 dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
693 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
696 DRM_ERROR("clock recovery failed\n");
698 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
699 train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
700 (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
701 DP_TRAIN_PRE_EMPHASIS_SHIFT);
704 /* set training pattern 2 on the sink */
705 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_2);
706 /* set training pattern 2 on the source */
707 if (ASIC_IS_DCE4(rdev))
708 atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2);
710 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
711 dig_connector->dp_clock, enc_id, 1);
713 /* channel equalization loop */
718 if (!atom_dp_get_link_status(radeon_connector, link_status))
721 if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count)) {
728 DRM_ERROR("channel eq failed: 5 tries\n");
732 /* Compute new train_set as requested by sink */
733 dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
734 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
740 DRM_ERROR("channel eq failed\n");
742 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
743 train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
744 (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
745 >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
747 /* disable the training pattern on the sink */
748 dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
750 /* disable the training pattern on the source */
751 if (ASIC_IS_DCE4(rdev))
752 atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE);
754 radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
755 dig_connector->dp_clock, enc_id, 0);
758 int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
759 uint8_t write_byte, uint8_t *read_byte)
761 struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
762 struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
764 uint16_t address = algo_data->address;
767 int msg_len, dp_msg_len;
770 /* Set up the command byte */
771 if (mode & MODE_I2C_READ)
772 msg[2] = AUX_I2C_READ << 4;
774 msg[2] = AUX_I2C_WRITE << 4;
776 if (!(mode & MODE_I2C_STOP))
777 msg[2] |= AUX_I2C_MOT << 4;
780 msg[1] = address >> 8;
799 msg[3] = (dp_msg_len) << 4;
800 ret = radeon_process_aux_ch(auxch, msg, msg_len, reply, reply_bytes, 0);
804 *read_byte = reply[0];