diff options
Diffstat (limited to 'src/soc/mediatek/mt8183')
| -rw-r--r-- | src/soc/mediatek/mt8183/dramc_pi_calibration_api.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c b/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c index 8c17d84df0..0ec0193664 100644 --- a/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c +++ b/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c @@ -1588,18 +1588,24 @@ static void dramc_set_tx_best_dly(u8 chn, u8 rank, bool bypass_tx, struct per_byte_dly center_dly[DQS_NUMBER]; u16 tune_diff, dq_delay_cell[DQ_DATA_WIDTH]; + + /* + * The clock rate is usually (frequency / 2 - delta), where the delta + * is introduced to avoid interference from RF peripherals like + * modem, WiFi, and Bluetooth. + */ switch (freq_group) { case LP4X_DDR1600: - clock_rate = 800; + clock_rate = 796; break; case LP4X_DDR2400: - clock_rate = 1200; + clock_rate = 1196; break; case LP4X_DDR3200: - clock_rate = 1600; + clock_rate = 1596; break; case LP4X_DDR3600: - clock_rate = 1866; + clock_rate = 1792; break; default: die("Invalid DDR frequency group %u\n", freq_group); @@ -1612,7 +1618,7 @@ static void dramc_set_tx_best_dly(u8 chn, u8 rank, bool bypass_tx, use_delay_cell = 0; if (fast_calib && bypass_tx) { - dramc_dbg("bypass TX\n"); + dramc_dbg("bypass TX, clock_rate: %d\n", clock_rate); for (u8 byte = 0; byte < DQS_NUMBER; byte++) { center_dly[byte].min_center = params->tx_center_min[chn][rank][byte]; center_dly[byte].max_center = params->tx_center_max[chn][rank][byte]; @@ -1645,8 +1651,10 @@ static void dramc_set_tx_best_dly(u8 chn, u8 rank, bool bypass_tx, tune_diff = vref_dly[index].win_center - center_dly[byte].min_center; dq_delay_cell[index] = ((tune_diff * 100000000) / - (clock_rate / 2 * 64)) / dly_cell_unit; + (clock_rate * 64)) / dly_cell_unit; byte_dly_cell[byte] |= (dq_delay_cell[index] << (bit * 4)); + dramc_show("u1DelayCellOfst[%d]=%d cells (%d PI)\n", + index, dq_delay_cell[index], tune_diff); } } } |