Re: OMAP3530 USB host problems

[Gary Thomas <gary@mlbassoc.com>]

Felipe Balbi wrote:
> On Fri, Feb 20, 2009 at 11:15:36AM -0700, Gary Thomas wrote:
>> I have a 3530 board (similar to the OMAP3EVM) and I'm trying
>> to get the USB host working.  Sadly, this is failing, but I
>> don't quite see why.  From drivers/usb/host/echi-omap.c:
>> 	/* Wait for TLL to be Active */
>>         timeout = 1000;
>> 	while ((cm_read_mod_reg(CORE_MOD, OMAP2430_CM_IDLEST3)
>> 			& (1 << OMAP3430ES2_ST_USBTLL_SHIFT)))
>>         {
>>             if (--timeout <= 0) {
>>                 printk(KERN_ERR "USB TLL is unavailable\n");
>>                 return -ENODEV;
>>             }
>> 		cpu_relax();
>>         }
>>
>> Any clues on why this might be?  How do I solve it?
> 
> could you enable CONFIG_DEBUG_LL and post the seria console output ?
> 
> do you really use TLL ?? I don't really know omap3evm, but I guess it
> uses PHY mode (correct me if I'm wrong).
> 

It's not that I _need_ TLL, the driver function omap_start_ehci()
tries to reset the part of the USB controller and fails.  I'm just
trying to understand why this part of the code falls over.

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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