Re: [RFT] Re: [Patch] [bug #26237] multiple problems with usb devices

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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On 06/01/2010 11:14 PM, Aleš Nesrsta wrote:
> On both HCs was not working device which has max. packet length for
> control endpoint lower than 64. As I remember that this patch was
> relative simple, I shortly looked into usb.c and usbtrans.c and there is
> mistake:
>
> --- usbtrans.c
> +++ usbtrans_corrected.c	
> @@ -76,7 +76,7 @@
>    setupdata_addr = grub_dma_get_phys (setupdata_chunk);
>  
>    /* Determine the maximum packet size.  */
> -  if (dev->initialized && dev->descdev.maxsize0)
> +  if (dev->descdev.maxsize0)
>      max = dev->descdev.maxsize0;
>    else
>      max = 64;
>
>   
Thanks, applied.
> Why:
> dev->initialized is set to TRUE too late (after address setting
> transaction) so we have to ignore it in control transfers - we must use
> value from dev->descdev.maxsize0 immediately after successful reading of
> first 8 bytes of device descriptor (where is this value included) - as
> is (probably not clearly, sorry) described by me in this part of usb.c
> code:
>
>   
Actualy I was confused because I had a similar change in the same place
to avoid division by zero.
> There is probably some new problem in OHCI because some devices are now
> very slow on this controller. Unfortunately I currently have no time to
> discover why - I am expecting some mistake probably in "toggling" and
> related code in ohci.c.
>   
I've managed to recreate it with one of my USB sticks. Investigating.
> On UHCI does not work my mobile phone. But I am not 100% sure if it
> worked before on UHCI and I have no time to try it now. I am 100% sure
> it worked on OHCI - so maybe it is similar problem as with my card
> reader.
>
> And some old (but probably not critical) problem remains in UHCI - there
> is still not properly working sequence:
> rmmod usbms, rmmod uhci, <removing of old device and connecting of new
> device>, insmod uhci, insmod usbms
>   
I haven't retried UHCI on my laptop but I think it will fail because
BIOS has a bug in EHCI handover.
> - it works on OHCI but on UHCI it does not work - for first look it is
> working (for example commands "ls" and "ls (usb0,1)" are working if
> these commands are used as first commands after device change) but for
> second look does not (for example command "ls (usb0,1)/<some directory>"
> reports USB mass storage stalled).
>
> Best regards
> Ales
>
>
> _______________________________________________
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> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel
>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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