static void
dp_get_adjust_train(dp_info* dp)
{
TRACE("%s\n", __func__);
const char* voltageNames[] = {
"0.4V", "0.6V", "0.8V", "1.2V"
};
const char* preEmphasisNames[] = {
"0dB", "3.5dB", "6dB", "9.5dB"
};
uint8 voltage = 0;
uint8 preEmphasis = 0;
int lane;
for (lane = 0; lane < dp->laneCount; lane++) {
uint8 laneVoltage = dp_get_adjust_request_voltage(dp, lane);
uint8 lanePreEmphasis = dp_get_adjust_request_pre_emphasis(dp, lane);
TRACE("%s: Requested %s at %s for lane %d\n", __func__,
preEmphasisNames[lanePreEmphasis >> DP_TRAIN_PRE_EMPHASIS_SHIFT],
voltageNames[laneVoltage >> DP_TRAIN_VCC_SWING_SHIFT],
lane);
if (laneVoltage > voltage)
voltage = laneVoltage;
if (lanePreEmphasis > preEmphasis)
preEmphasis = lanePreEmphasis;
}
// Check for maximum voltage and toggle max if reached
if (voltage >= DP_TRAIN_VCC_SWING_1200)
voltage |= DP_TRAIN_MAX_SWING_EN;
// Check for maximum pre-emphasis and toggle max if reached
if (preEmphasis >= DP_TRAIN_PRE_EMPHASIS_9_5)
preEmphasis |= DP_TRAIN_MAX_EMPHASIS_EN;
for (lane = 0; lane < 4; lane++)
dp->trainingSet[lane] = voltage | preEmphasis;
}
static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
int lane_count,
u8 train_set[4])
{
u8 v = 0;
u8 p = 0;
int lane;
for (lane = 0; lane < lane_count; lane++) {
u8 this_v = dp_get_adjust_request_voltage(link_status, lane);
u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
lane,
voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
if (this_v > v)
v = this_v;
if (this_p > p)
p = this_p;
}
if (v >= DP_VOLTAGE_MAX)
v |= DP_TRAIN_MAX_SWING_REACHED;
if (p >= DP_PRE_EMPHASIS_MAX)
p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
for (lane = 0; lane < 4; lane++)
train_set[lane] = v | p;
}
