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bios/sdram: reduce number of scan loops during cdly scan to speed it up.

This commit is contained in:
Florent Kermarrec 2020-04-25 12:51:33 +02:00
parent 43e1a5d67d
commit 96e7e6e89a
1 changed files with 5 additions and 5 deletions
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10
litex/soc/software/bios/sdram.c
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@ -310,7 +310,7 @@ static void write_delay_inc(int module) {
ddrphy_dly_sel_write(0);
}
static int write_level_scan(int *delays, int show)
static int write_level_scan(int *delays, int loops, int show)
{
int i, j, k;
@ -345,7 +345,7 @@ static int write_level_scan(int *delays, int show)
#if SDRAM_PHY_DELAYS > 32
show_iter = (j%16 == 0) && show;
#endif
for (k=0; k<128; k++) {
for (k=0; k<loops; k++) {
ddrphy_wlevel_strobe_write(1);
cdelay(10);
csr_rd_buf_uint8(sdram_dfii_pix_rddata_addr[0],
@ -433,7 +433,7 @@ static void write_level_cdly_range(unsigned int *best_error, int *best_cdly,
}
/* write level using this delay */
if (write_level_scan(delays, 0)) {
if (write_level_scan(delays, 8, 0)) {
/* use the mean of delays for error calulation */
int delay_mean = 0;
for (int i=0; i < SDRAM_PHY_MODULES; ++i) {
@ -511,7 +511,7 @@ int write_level(void)
printf("Data scan:\n");
/* re-run write leveling the final time */
if (!write_level_scan(delays, 1))
if (!write_level_scan(delays, 128, 1))
return 0;
return best_cdly >= 0;
@ -1073,7 +1073,7 @@ int sdrlevel(void)
} else {
/* use only the current cdly */
int delays[SDRAM_PHY_MODULES];
write_level_scan(delays, 1);
write_level_scan(delays, 128, 1);
}
#endif