[PATCH] USB: ohci, move ppc asic tweaks nearer pci

This should fix a suspend/resume issues that appear with OHCI on some
PPC hardware.  The PCI layer should doesn't have the hooks needed for
such ASIC-specific hooks (in this case, software clock gating), so
this moves the code to do that into hcd-pci.c ... where it can be
done after the relevant PCI PM state transition (to/from D3).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 36 insertions, 2 deletions

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 7feb829362d..5131d88e8c5 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -20,9 +20,17 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/usb.h>
+
 #include <asm/io.h>
 #include <asm/irq.h>
-#include <linux/usb.h>
+
+#ifdef CONFIG_PPC_PMAC
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/pci-bridge.h>
+#include <asm/prom.h>
+#endif
 
 #include "usb.h"
 #include "hcd.h"
@@ -277,8 +285,22 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
         }
 
 done:
-        if (retval == 0)
+        if (retval == 0) {
                 dev->dev.power.power_state = PMSG_SUSPEND;
+
+#ifdef CONFIG_PPC_PMAC
+                /* Disable ASIC clocks for USB */
+                if (_machine == _MACH_Pmac) {
+                        struct device_node      *of_node;
+
+                        of_node = pci_device_to_OF_node (dev);
+                        if (of_node)
+                                pmac_call_feature(PMAC_FTR_USB_ENABLE,
+                                                        of_node, 0, 0);
+                }
+#endif
+        }
+
         return retval;
 }
 EXPORT_SYMBOL (usb_hcd_pci_suspend);
@@ -301,6 +323,18 @@ int usb_hcd_pci_resume (struct pci_dev *dev)
                 return 0;
         }
 
+#ifdef CONFIG_PPC_PMAC
+        /* Reenable ASIC clocks for USB */
+        if (_machine == _MACH_Pmac) {
+                struct device_node *of_node;
+
+                of_node = pci_device_to_OF_node (dev);
+                if (of_node)
+                        pmac_call_feature (PMAC_FTR_USB_ENABLE,
+                                                of_node, 0, 1);
+        }
+#endif
+
         /* NOTE:  chip docs cover clean "real suspend" cases (what Linux
          * calls "standby", "suspend to RAM", and so on).  There are also
          * dirty cases when swsusp fakes a suspend in "shutdown" mode.