On some Intel MID platforms the ChipIdea USB controller is used. The EHCI PCI
is in conflict with the proper driver. The patch makes ehci-pci to be ignored
in favour of ChipIdea controller.
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
drivers/usb/host/ehci-pci.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 851006a..2a5d2fd 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -43,6 +43,24 @@ static inline bool is_intel_quark_x1000(struct pci_dev *pdev)
}
/*
+ * This is the list of PCI IDs for the devices that have EHCI USB class and
+ * specific drivers for that. One of the example is a ChipIdea device installed
+ * on some Intel MID platforms.
+ */
+static const struct pci_device_id bypass_pci_id_table[] = {
+ /* ChipIdea on Intel MID platform */
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0811), },
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0829), },
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xe006), },
+ {}
+};
+
+static inline bool is_bypassed_id(struct pci_dev *pdev)
+{
+ return !!pci_match_id(bypass_pci_id_table, pdev);
+}
+
+/*
* 0x84 is the offset of in/out threshold register,
* and it is the same offset as the register of 'hostpc'.
*/
@@ -352,6 +370,13 @@ static const struct ehci_driver_overrides pci_overrides __initconst = {
/*-------------------------------------------------------------------------*/
+static int ehci_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ if (is_bypassed_id(pdev))
+ return -ENODEV;
+ return usb_hcd_pci_probe(pdev, id);
+}
+
/* PCI driver selection metadata; PCI hotplugging uses this */
static const struct pci_device_id pci_ids [] = { {
/* handle any USB 2.0 EHCI controller */
@@ -370,7 +395,7 @@ static struct pci_driver ehci_pci_driver = {
.name = (char *) hcd_name,
.id_table = pci_ids,
- .probe = usb_hcd_pci_probe,
+ .probe = ehci_pci_probe,
.remove = usb_hcd_pci_remove,
.shutdown = usb_hcd_pci_shutdown,
--
2.1.4
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