[patch 18/24] ieee1394: ohci1394: add PPC_PMAC platform code to driver probe

Chris Wright
2006-12-15T01:42:40Z

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2.6.18-stable review patch. If anyone has any objections, please let us know.
------------------

From: Stefan Richter <stefanr@s5r6.in-berlin.de>

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=7431
iBook G3 threw a machine check exception and put the display backlight
to full brightness after ohci1394 was unloaded and reloaded.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
[dsd@gentoo.org: also added missing if condition, commit
63cca59e89892497e95e1e9c7156d3345fb7e2e8]
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
It fixes a kernel oops which occurs when the ohci1394 driver is reloaded on PPC
http://bugs.gentoo.org/154851

drivers/ieee1394/ohci1394.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)

--- linux-2.6.18.5.orig/drivers/ieee1394/ohci1394.c
+++ linux-2.6.18.5/drivers/ieee1394/ohci1394.c
@@ -3218,6 +3218,19 @@ static int __devinit ohci1394_pci_probe(
struct ti_ohci *ohci; /* shortcut to currently handled device */
resource_size_t ohci_base;

+#ifdef CONFIG_PPC_PMAC
+ /* Necessary on some machines if ohci1394 was loaded/ unloaded before */
+ if (machine_is(powermac)) {
+ struct device_node *of_node = pci_device_to_OF_node(dev);
+
+ if (of_node) {
+ pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, of_node,
+ 0, 1);
+ pmac_call_feature(PMAC_FTR_1394_ENABLE, of_node, 0, 1);
+ }
+ }
+#endif /* CONFIG_PPC_PMAC */
+
if (pci_enable_device(dev))
FAIL(-ENXIO, "Failed to enable OHCI hardware");
pci_set_master(dev);
@@ -3506,11 +3519,9 @@ static void ohci1394_pci_remove(struct p
#endif

#ifdef CONFIG_PPC_PMAC
- /* On UniNorth, power down the cable and turn off the chip
- * clock when the module is removed to save power on
- * laptops. Turning it back ON is done by the arch code when
- * pci_enable_device() is called */
- {
+ /* On UniNorth, power down the cable and turn off the chip clock
+ * to save power on laptops */
+ if (machine_is(powermac)) {
struct device_node* of_node;

of_node = pci_device_to_OF_node(ohci->dev);

--