From: Patrick Georgi <patrick.georgi@secunet.com>
Date: Fri, 28 Oct 2011 07:01:54 +0000 (+0200)
Subject: sb600: Implement EHCI workaround
X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=coreboot.git;a=commitdiff_plain;h=0f8590f9ca8026af62efa510a1c717d2d0729e3d

sb600: Implement EHCI workaround

Linux implements it itself, but older Linuxes and other systems
might not. Without this, the host controller might not respond
to drivers.

Change-Id: I4ff0e3683c02e7aa00d188428847c64c4c5d589d
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/345
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
---

diff --git a/src/southbridge/amd/sb600/usb.c b/src/southbridge/amd/sb600/usb.c
index 7539f083c..7ff8f5c9a 100644
--- a/src/southbridge/amd/sb600/usb.c
+++ b/src/southbridge/amd/sb600/usb.c
@@ -119,6 +119,11 @@ static void usb_init2(struct device *dev)
 	dword &= ~(1 << 28);
 	pci_write_config32(dev, 0x50, dword);
 
+	/* EHCI Erratum (adapted from Linux) */
+	dword = pci_read_config32(dev, 0x53);
+	dword |= (1 << 3);
+	pci_write_config32(dev, 0x53, dword);
+
 	/* RPR5.14 Disable USB PHY PLL Reset signal to come from ACPI */
 	byte = pci_read_config8(dev, 0x54);
 	byte &= ~(1 << 0);