bios/sdram: iterate multiple time for write leveling and add vote to eliminate transcients
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09f962fdc4
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@ -229,7 +229,7 @@ void sdrwloff(void)
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int write_level(void)
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int write_level(void)
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{
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{
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int i, j;
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int i, j, k;
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int dq_address;
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int dq_address;
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unsigned char dq;
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unsigned char dq;
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@ -269,11 +269,22 @@ int write_level(void)
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#endif
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#endif
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/* scan taps */
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/* scan taps */
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for(j=0;j<err_ddrphy_wdly;j++) {
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for(j=0;j<err_ddrphy_wdly;j++) {
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int zero_count = 0;
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int one_count = 0;
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for (k=0; k<128; k++) {
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ddrphy_wlevel_strobe_write(1);
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ddrphy_wlevel_strobe_write(1);
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cdelay(10);
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cdelay(10);
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dq = MMPTR(dq_address);
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dq = MMPTR(dq_address);
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printf("%d", dq != 0);
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if (dq != 0)
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taps_scan[j] = (dq != 0);
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one_count++;
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else
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zero_count++;
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}
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if (one_count > zero_count)
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taps_scan[j] = 1;
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else
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taps_scan[j] = 0;
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printf("%d", taps_scan[j]);
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ddrphy_wdly_dq_inc_write(1);
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ddrphy_wdly_dq_inc_write(1);
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ddrphy_wdly_dqs_inc_write(1);
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ddrphy_wdly_dqs_inc_write(1);
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cdelay(10);
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cdelay(10);
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