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nb/amd/mct_ddr3: Require minumum training quality for both read and write 

The existing MCT code proceeded to the next DRAM training phase if
the minimum lane quality standard passed for either the read or
write direction.  Ensure that both pass for a given set of delay
values before proceeding to the next training phase.

Change-Id: I2316ca639f58a23cf64bea56290e9422e02edf1c
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/13993
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Timothy Pearson 2016-03-08 16:44:39 -06:00 committed by Martin Roth
parent 50583f0e1f
commit 2e1f73181a
1 changed files with 10 additions and 2 deletions
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12
src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c
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@ -1318,6 +1318,8 @@ static uint8_t TrainDQSRdWrPos_D_Fam15(struct MCTStatStruc *pMCTstat,
uint8_t write_iter;
uint8_t read_iter;
uint8_t check_antiphase;
uint8_t passing_read_dqs_delay_found;
uint8_t passing_write_dqs_delay_found;
uint16_t initial_write_dqs_delay[MAX_BYTE_LANES];
uint16_t initial_read_dqs_delay[MAX_BYTE_LANES];
uint16_t initial_write_data_timing[MAX_BYTE_LANES];
@ -1385,6 +1387,9 @@ static uint8_t TrainDQSRdWrPos_D_Fam15(struct MCTStatStruc *pMCTstat,
memcpy(current_write_data_delay, initial_write_data_timing, sizeof(current_write_data_delay));
for (lane = lane_start; lane < lane_end; lane++) {
passing_read_dqs_delay_found = 0;
passing_write_dqs_delay_found = 0;
/* 2.10.5.8.4 (2)
* For each Write Data Delay value from Write DQS Delay to Write DQS Delay + 1 UI
*/
@ -1510,7 +1515,7 @@ static uint8_t TrainDQSRdWrPos_D_Fam15(struct MCTStatStruc *pMCTstat,
/* Program the Read DQS Timing Control register with the center of the passing window */
current_read_dqs_delay[lane] = region_center << 1;
passing_dqs_delay_found[lane] = 1;
passing_read_dqs_delay_found = 1;
/* Commit the current Read DQS Timing Control settings to the hardware registers */
write_dqs_read_data_timing_registers(current_read_dqs_delay, dev, dct, dimm, index_reg);
@ -1563,7 +1568,7 @@ static uint8_t TrainDQSRdWrPos_D_Fam15(struct MCTStatStruc *pMCTstat,
current_write_dqs_delay[lane] = ((best_pos + initial_write_dqs_delay[lane]) + (best_count / 3));
else
current_write_dqs_delay[lane] = ((best_pos + initial_write_dqs_delay[lane]) + (best_count / 2));
passing_dqs_delay_found[lane] = 1;
passing_write_dqs_delay_found = 1;
/* Commit the current Write DQS Timing Control settings to the hardware registers */
write_dqs_write_data_timing_registers(current_write_dqs_delay, dev, dct, dimm, index_reg);
@ -1580,6 +1585,9 @@ static uint8_t TrainDQSRdWrPos_D_Fam15(struct MCTStatStruc *pMCTstat,
/* Reprogram the Write DQS Timing Control register with the original settings */
write_dqs_write_data_timing_registers(current_write_dqs_delay, dev, dct, dimm, index_reg);
}
if (passing_read_dqs_delay_found && passing_write_dqs_delay_found)
passing_dqs_delay_found[lane] = 1;
}
#ifdef PRINT_PASS_FAIL_BITMAPS