ehci-ixp4xx driver issue

["Mo, Vincent" <vincent.mo@xxxxxxxxxxxxxxxxxx>]

I previously used Vladimir Barinov's EHCI HCD glue patch on the 2.6.24.3
kernel and it worked.  I'm currently using the 2.6.28.1 kernel and I see
that the glue patch has already been incorporated into the mainline
code.  However, I'm having problems with enumerating USB devices I plug
into the system.  On a separate note, I still had to add the
platform_device for the uhc in arch/arm/mach-ixp4xx/common.c, I'm not
sure why this isn't already in there if the ehci-ixp4xx driver is
supported:

static struct resource ixp4xx_uhc_resources[] = {
        {
                .start  = 0xcd000000,
                .end    = 0xcdffffff,
                .flags  = IORESOURCE_MEM,
        },
        {
                .start  = IRQ_IXP4XX_USB_HOST,
                .end    = IRQ_IXP4XX_USB_HOST,
                .flags  = IORESOURCE_IRQ,
        }
};

static u64 ixp4xx_uhc_dmamask = 0xffffffff;
static struct platform_device ixp4xx_uhc_device = {
        .name           = "ixp4xx-ehci",
        .id             = -1,
        .num_resources  = 2,
        .resource       = ixp4xx_uhc_resources,
        .dev            = {
                //.platform_data = ,
                .coherent_dma_mask = 0xffffffff,
                .dma_mask = &ixp4xx_uhc_dmamask,
        },
};

The problem I'm having is that the system doesn't recognize any memory
drives I plug in and I get these messages:
usb 1-1: new full speed USB device using ixp4xx-ehci and address 2
hub 1-0:1.0: unable to enumerate USB device on port 1

Here's a more detailed log with debugging turned on:
hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
ixp4xx-ehci ixp4xx-ehci: GetStatus port 1 status 40001813 POWER sig=j OC
CSC CONNECT
hub 1-0:1.0: port 1, status 0109, change 0001, 12 Mb/s
hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x109
ixp4xx-ehci ixp4xx-ehci: GetStatus port 1 status 4000181d POWER sig=j OC
PEC PE CONNECT
usb 1-1: new full speed USB device using ixp4xx-ehci and address 4
ixp4xx-ehci ixp4xx-ehci: GetStatus port 1 status 40001813 POWER sig=j OC
CSC CONNECT
hub 1-0:1.0: unable to enumerate USB device on port 1
hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002

As I mentioned earlier, the patch I incorporated in 2.6.24.3 worked but
the mainline driver is not working.  I'm not sure if this problem lies
in the ehci-ixp4xx driver itself or the ehci-hcd or ehci-hub driver?

It would be great if anyone who has ran into this problem could give me
a hand.  Thanks.

Vincent Mo

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