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software/liblitedram/sdram.c: move activate/precharge to sdram_write_read_check_test_pattern, change second seed.

This commit is contained in:
Florent Kermarrec 2020-10-12 13:00:44 +02:00
parent d1f04e67c5
commit d4d4ca53b0
1 changed files with 10 additions and 16 deletions
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26
litex/soc/software/liblitedram/sdram.c
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@ -668,6 +668,9 @@ static int sdram_write_read_check_test_pattern(int module, unsigned int seed) {
}
}
/* Activate */
sdram_activate_test_row();
/* Write pseudo-random sequence */
for(p=0;p<SDRAM_PHY_PHASES;p++)
csr_wr_buf_uint8(sdram_dfii_pix_wrdata_addr[p], prs[p], DFII_PIX_DATA_BYTES);
@ -686,6 +689,9 @@ static int sdram_write_read_check_test_pattern(int module, unsigned int seed) {
command_prd(DFII_COMMAND_CAS|DFII_COMMAND_CS|DFII_COMMAND_RDDATA);
cdelay(15);
/* Precharge */
sdram_precharge_test_row();
for(p=0;p<SDRAM_PHY_PHASES;p++) {
/* Read back test pattern */
csr_rd_buf_uint8(sdram_dfii_pix_rddata_addr[p], tst, DFII_PIX_DATA_BYTES);
@ -708,9 +714,6 @@ static int sdram_read_leveling_scan_module(int module, int bitslip, int show)
int i;
int score;
/* Activate */
sdram_activate_test_row();
/* Check test pattern for each delay value */
score = 0;
if (show)
@ -722,8 +725,8 @@ static int sdram_read_leveling_scan_module(int module, int bitslip, int show)
#if SDRAM_PHY_DELAYS > 32
_show = (i%16 == 0) & show;
#endif
working = sdram_write_read_check_test_pattern(module, 42);
working &= sdram_write_read_check_test_pattern(module, 43);
working = sdram_write_read_check_test_pattern(module, 42);
working &= sdram_write_read_check_test_pattern(module, 84);
if (_show)
printf("%d", working);
score += working;
@ -732,9 +735,6 @@ static int sdram_read_leveling_scan_module(int module, int bitslip, int show)
if (show)
printf("| ");
/* Precharge */
sdram_precharge_test_row();
return score;
}
@ -746,15 +746,12 @@ static void sdram_read_leveling_module(int module)
printf("delays: ");
/* Activate */
sdram_activate_test_row();
/* Find smallest working delay */
delay = 0;
sdram_read_leveling_rst_delay(module);
while(1) {
working = sdram_write_read_check_test_pattern(module, 42);
working &= sdram_write_read_check_test_pattern(module, 43);
working &= sdram_write_read_check_test_pattern(module, 84);
if(working)
break;
delay++;
@ -778,7 +775,7 @@ static void sdram_read_leveling_module(int module)
/* Find largest working delay */
while(1) {
working = sdram_write_read_check_test_pattern(module, 42);
working &= sdram_write_read_check_test_pattern(module, 43);
working &= sdram_write_read_check_test_pattern(module, 84);
if(!working)
break;
delay++;
@ -797,9 +794,6 @@ static void sdram_read_leveling_module(int module)
sdram_read_leveling_rst_delay(module);
for(i=0;i<(delay_min+delay_max)/2;i++)
sdram_read_leveling_inc_delay(module);
/* Precharge */
sdram_precharge_test_row();
}
#endif /* CSR_DDRPHY_BASE */