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-rw-r--r--src/northbridge/intel/sandybridge/raminit_common.c39
1 files changed, 34 insertions, 5 deletions
diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c
index 5347c5c493..53f28c6cd6 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.c
+++ b/src/northbridge/intel/sandybridge/raminit_common.c
@@ -1524,6 +1524,24 @@ static void test_timC(ramctr_timing * ctrl, int channel, int slotrank)
wait_428c(channel);
}
+static void timC_threshold_process(int *data, const int count)
+{
+ int min = data[0];
+ int max = min;
+ int i;
+ for (i = 1; i < count; i++) {
+ if (min > data[i])
+ min = data[i];
+ if (max < data[i])
+ max = data[i];
+ }
+ int threshold = min/2 + max/2;
+ for (i = 0; i < count; i++)
+ data[i] = data[i] > threshold;
+ printram("threshold=%d min=%d max=%d\n",
+ threshold, min, max);
+}
+
static int discover_timC(ramctr_timing *ctrl, int channel, int slotrank)
{
int timC;
@@ -1554,14 +1572,25 @@ static int discover_timC(ramctr_timing *ctrl, int channel, int slotrank)
}
}
FOR_ALL_LANES {
- struct run rn =
- get_longest_zero_run(statistics[lane], MAX_TIMC + 1);
- ctrl->timings[channel][slotrank].lanes[lane].timC = rn.middle;
- if (rn.all) {
+ struct run rn = get_longest_zero_run(
+ statistics[lane], ARRAY_SIZE(statistics[lane]));
+ if (rn.all || rn.length < 8) {
printk(BIOS_EMERG, "timC discovery failed: %d, %d, %d\n",
channel, slotrank, lane);
- return MAKE_ERR;
+ /* With command training not happend yet, the lane can
+ * be erroneous. Take the avarage as reference and try
+ * again to find a run.
+ */
+ timC_threshold_process(statistics[lane],
+ ARRAY_SIZE(statistics[lane]));
+ rn = get_longest_zero_run(statistics[lane],
+ ARRAY_SIZE(statistics[lane]));
+ if (rn.all || rn.length < 8) {
+ printk(BIOS_EMERG, "timC recovery failed\n");
+ return MAKE_ERR;
+ }
}
+ ctrl->timings[channel][slotrank].lanes[lane].timC = rn.middle;
printram("timC: %d, %d, %d: 0x%02x-0x%02x-0x%02x\n",
channel, slotrank, lane, rn.start, rn.middle, rn.end);
}