static int analogix_dp_process_clock_recovery(struct analogix_dp_device *dp)
{
int lane, lane_count, retval;
u8 voltage_swing, pre_emphasis, training_lane;
u8 link_status[2], adjust_request[2];
usleep_range(100, 101);
lane_count = dp->link_train.lane_count;
retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
if (retval < 0)
return retval;
retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
adjust_request, 2);
if (retval < 0)
return retval;
if (analogix_dp_clock_recovery_ok(link_status, lane_count) == 0) {
/* set training pattern 2 for EQ */
analogix_dp_set_training_pattern(dp, TRAINING_PTN2);
retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
DP_LINK_SCRAMBLING_DISABLE |
DP_TRAINING_PATTERN_2);
if (retval < 0)
return retval;
dev_info(dp->dev, "Link Training Clock Recovery success\n");
dp->link_train.lt_state = EQUALIZER_TRAINING;
} else {
for (lane = 0; lane < lane_count; lane++) {
training_lane = analogix_dp_get_lane_link_training(
dp, lane);
voltage_swing = analogix_dp_get_adjust_request_voltage(
adjust_request, lane);
pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis(
adjust_request, lane);
if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
voltage_swing &&
DPCD_PRE_EMPHASIS_GET(training_lane) ==
pre_emphasis)
dp->link_train.cr_loop[lane]++;
if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
voltage_swing == VOLTAGE_LEVEL_3 ||
pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
dp->link_train.cr_loop[lane],
voltage_swing, pre_emphasis);
analogix_dp_reduce_link_rate(dp);
return -EIO;
}
}
}
analogix_dp_get_adjust_training_lane(dp, adjust_request);
for (lane = 0; lane < lane_count; lane++)
analogix_dp_set_lane_link_training(dp,
dp->link_train.training_lane[lane], lane);
retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
dp->link_train.training_lane, lane_count);
if (retval < 0)
return retval;
return 0;
}
static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp)
{
int lane, lane_count, retval;
u32 reg;
u8 link_align, link_status[2], adjust_request[2];
usleep_range(400, 401);
lane_count = dp->link_train.lane_count;
retval = analogix_dp_read_bytes_from_dpcd(dp,
DP_LANE0_1_STATUS, 2, link_status);
if (retval)
return retval;
if (analogix_dp_clock_recovery_ok(link_status, lane_count)) {
analogix_dp_reduce_link_rate(dp);
return -EIO;
}
retval = analogix_dp_read_bytes_from_dpcd(dp,
DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
if (retval)
return retval;
retval = analogix_dp_read_byte_from_dpcd(dp,
DP_LANE_ALIGN_STATUS_UPDATED, &link_align);
if (retval)
return retval;
analogix_dp_get_adjust_training_lane(dp, adjust_request);
if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) {
/* traing pattern Set to Normal */
analogix_dp_training_pattern_dis(dp);
dev_info(dp->dev, "Link Training success!\n");
analogix_dp_get_link_bandwidth(dp, ®);
dp->link_train.link_rate = reg;
dev_dbg(dp->dev, "final bandwidth = %.2x\n",
dp->link_train.link_rate);
analogix_dp_get_lane_count(dp, ®);
dp->link_train.lane_count = reg;
dev_dbg(dp->dev, "final lane count = %.2x\n",
dp->link_train.lane_count);
/* set enhanced mode if available */
analogix_dp_set_enhanced_mode(dp);
dp->link_train.lt_state = FINISHED;
return 0;
}
/* not all locked */
dp->link_train.eq_loop++;
if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
dev_err(dp->dev, "EQ Max loop\n");
analogix_dp_reduce_link_rate(dp);
return -EIO;
}
for (lane = 0; lane < lane_count; lane++)
analogix_dp_set_lane_link_training(dp,
dp->link_train.training_lane[lane], lane);
retval = analogix_dp_write_bytes_to_dpcd(dp, DP_TRAINING_LANE0_SET,
lane_count, dp->link_train.training_lane);
return retval;
}
