linux-kernel - Re: amd5536udc interrupts bug

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Message-Id: <200901081802.43625.vlobanov@speakeasy.net>
Date:	Thu, 8 Jan 2009 18:02:43 -0800
From:	Vadim Lobanov <vlobanov@...akeasy.net>
To:	Thomas Dahlmann <dahlmann.thomas@...or.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: amd5536udc interrupts bug

On Thursday 08 January 2009 08:40:28 Thomas Dahlmann wrote:
> Maybe you want to try this. It should work to place the register init
> from udc_probe()
>
> /* udc csr registers base */
> dev->csr = dev->virt_addr + UDC_CSR_ADDR;
> /* dev registers base */
> dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
> /* ep registers base */spin_lock_init(&dev->lock);
> dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
> /* fifo's base */
> dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
> dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
>
> just before request_irq(...) to allow the interrupt handler to read the
> interrupt status
> registers.

I did this. Actually, I also yanked the "spin_lock_init(&dev->lock)" bit 
before the request_irq() as well, since that field was also obviously 
needed for the irq routine. (I didn't check for any other necessary but 
less-obvious fields.) With these changes, the module modprobes just 
fine.

Alas, the hardware doesn't work. When I try plugging in the other end of 
the USB cable, absolutely nothing happens. Not even an interrupt: 
/proc/interrupts for the amd5536udc line stays at zero. Any thoughts on 
possible ways to tackle this / what could be going wrong / etc?

-- Vadim Lobanov

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