Patchwork [6/8] ASUS M2V support: K8T890 PCIe bugfix

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Submitter Tobias Diedrich
Date 2010-10-27 11:30:25
Message ID <20101027113025.GK17791@yumi.tdiedrich.de>
Download mbox | patch
Permalink /patch/2184/
State Superseded
Headers show

Comments

Tobias Diedrich - 2010-10-27 11:30:25
Need to clear downstream read cycle retry bit, or the bus scan will
hang.

---

Patch

Index: src/southbridge/via/k8t890/k8t890_pcie.c
===================================================================
--- src.orig/southbridge/via/k8t890/k8t890_pcie.c	2010-10-27 11:34:19.000000000 +0200
+++ src/southbridge/via/k8t890/k8t890_pcie.c	2010-10-27 12:45:22.000000000 +0200
@@ -35,6 +41,13 @@ 
 	reg = pci_read_config8(dev, 0x50);
 	pci_write_config8(dev, 0x50, reg | 0x10);
 
+	/*
+	 * Disable downstream read cycle retry,
+	 * needed for asus m2v / k8t890cf or bus scan will hang.
+	 */
+	reg = pci_read_config8(dev, 0xa3);
+	pci_write_config8(dev, 0xa3, reg & ~0x01);
+
 	/* Award has 0xb, VIA recomends 0x4. */
 	pci_write_config8(dev, 0xe1, 0xb);
 
@@ -75,6 +88,13 @@ 
 	reg = pci_read_config8(dev, 0x50);
 	pci_write_config8(dev, 0x50, reg | 0x10);
 
+	/*
+	 * Disable downstream read cycle retry,
+	 * needed for asus m2v / k8t890cf or bus scan will hang.
+	 */
+	reg = pci_read_config8(dev, 0xa3);
+	pci_write_config8(dev, 0xa3, reg & ~0x01);
+
 	/* Award has 0xb, VIA recommends 0x4. */
 	pci_write_config8(dev, 0xe1, 0xb);
 	/* Set replay timer limit. */