[U-Boot] [PATCH 5/7] usb: hub: Increase device enumeration timeout for broken drives

[Marek Vasut]

Dear Vivek Gautam,

> Hi Marek,
> 
> On Thu, Mar 28, 2013 at 8:02 PM, Marek Vasut <marex at denx.de> wrote:
> > Dear Vivek Gautam,
> > 
> >> Few broken usb mass storage devices can take some time to set
> >> Current Connect Status (CCS) and Connect Status Change (CSC) in
> >> Port status register after an attach.
> >> So increasing some timeout when both CCS and CSC bits are not set.
> >> 
> >> Signed-off-by: Amar <amarendra.xt at samsung.com>
> >> Signed-off-by: Vivek Gautam <gautam.vivek at samsung.com>
> > 
> > Can we not postpone checking of these CCS and CSC bits for such broken
> > devices? This'd at least allow the "good" devices to be detected quickly
> > and while these are handled, this would give some time for the "bad"
> > ones to do their job too.
> 
> We are thinking of one approach here.
> Iterating over all the ports once, so that we find 'good' ports and 'bad'
> ports By 'bad' port we mean that either the device connected to it is bad
> or nothing is connected
> to this port.
> Once we are done with "usb_hub_port_connect_change()" and other jobs
> for 'good' ports,
> we iterate once again on bad ports.
> Not sure how good this approach :-(.  Any suggestions ?

That might just work, but I wonder if it's worth it. It's a pity we can't make a 
list of those as they're not even probed yet :(

Best regards,
Marek Vasut