X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fdevices%2Fhypertransport.c;h=6d37ab5764880325d57f0a40337dd8376eee5df8;hb=085cb4b4ca9a51e42f0665850e2cc9879bfbfa76;hp=c61efa6c7b893671b95fa9173af5521acd0a3e6d;hpb=9a791dffeae2097aa0a18f645ce07acfed41b9bc;p=coreboot.git

diff --git a/src/devices/hypertransport.c b/src/devices/hypertransport.c
index c61efa6c7..6d37ab576 100644
--- a/src/devices/hypertransport.c
+++ b/src/devices/hypertransport.c
@@ -278,7 +278,20 @@ static void ht_collapse_early_enumeration(struct bus *bus, unsigned offset_uniti
 		}
 		/* Has the link failed? */
 		if (ctrl & (1 << 4)) {
-			return;
+			/*
+			 * Either the link has failed, or we have
+			 * a CRC error.
+			 * Sometimes this can happen due to link
+			 * retrain, so lets knock it down and see
+			 * if its transient
+			 */
+			ctrl |= ((1 << 4) | (1 <<8)); // Link fail + Crc
+			pci_write_config16(prev.dev, prev.pos + prev.ctrl_off, ctrl);
+			ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off);
+			if (ctrl & ((1 << 4) | (1 << 8))) {
+				printk_alert("Detected error on Hypertransport Link\n");
+				return;
+			}
 		}
 	} while((ctrl & (1 << 5)) == 0);
 
@@ -382,12 +395,25 @@ unsigned int hypertransport_scan_chain(struct bus *bus,
 		/* Wait until the link initialization is complete */
 		do {
 			ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off);
-			/* Is this the end of the hypertransport chain?
-			 * Has the link failed?
-			 * If so further scanning is pointless.
-			 */
-			if (ctrl & ((1 << 6) | (1 << 4))) {
-				goto end_of_chain;
+
+			if (ctrl & (1 << 6))
+				goto end_of_chain;	// End of chain
+
+			if (ctrl & ((1 << 4) | (1 << 8))) {
+				/*
+				 * Either the link has failed, or we have
+				 * a CRC error.
+				 * Sometimes this can happen due to link
+				 * retrain, so lets knock it down and see
+				 * if its transient
+				 */
+				ctrl |= ((1 << 4) | (1 <<8)); // Link fail + Crc
+				pci_write_config16(prev.dev, prev.pos + prev.ctrl_off, ctrl);
+				ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off);
+				if (ctrl & ((1 << 4) | (1 << 8))) {
+					printk_alert("Detected error on Hypertransport Link\n");
+					goto end_of_chain;
+				}
 			}
 		} while((ctrl & (1 << 5)) == 0);