pata_cm64x: fix boot crash on parisc

The old IDE cmd64x checks the status of the CNTRL register to see if
the ports are enabled before probing them.  pata_cmd64x doesn't do
this, which causes a HPMC on parisc when it tries to poke at the
secondary port because apparently the BAR isn't wired up (and a
non-responding piece of memory causes a HPMC).

Fix this by porting the CNTRL register port detection logic from IDE
cmd64x.  In addition, following converns from Alan Cox, add a check to
see if a mobility electronics bridge is the immediate parent and forgo
the check if it is (prevents problems on hotplug controllers).

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 8abe8d78c4bf..8652a4fa3fe2 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -608,6 +608,8 @@
 #define PCI_DEVICE_ID_MATROX_G550       0x2527
 #define PCI_DEVICE_ID_MATROX_VIA        0x4536
 
+#define PCI_VENDOR_ID_MOBILITY_ELECTRONICS      0x14f2
+
 #define PCI_VENDOR_ID_CT                0x102c
 #define PCI_DEVICE_ID_CT_69000          0x00c0
 #define PCI_DEVICE_ID_CT_65545          0x00d8