netdev - [PATCH 1/5] firewire: ohci: restore GUID register on resume.

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Date:	Sun, 28 Nov 2010 03:15:32 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	linux1394-devel <linux1394-devel@...ts.sourceforge.net>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>, netdev@...r.kernel.org,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: [PATCH 1/5] firewire: ohci: restore GUID register on resume.

Some lousy BIOSes, eg my Aspire 5720 BIOS forgets to restore
device GUID on resume from ram.

Fix that by programming GUID register on resume from ram
Since that register is one time programable according to spec,
that has no effect on systems that have sane BIOS (Are there any?)

Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>
---
 drivers/firewire/ohci.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 6dd56cd..cadd6af 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -3240,6 +3240,10 @@ static int pci_resume(struct pci_dev *dev)
 		return err;
 	}
 
+	/* Some bioses forget to reinitialize the GUID. Do that ourselves */
+	reg_write(ohci, OHCI1394_GUIDLo, ohci->card.guid & 0xFFFFFFFF);
+	reg_write(ohci, OHCI1394_GUIDHi, (ohci->card.guid >> 32) & 0xFFFFFFFF);
+
 	return ohci_enable(&ohci->card, NULL, 0);
 }
 #endif
-- 
1.7.1

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