>-----Original Message----- >From: uclinux-dist-devel-bounces@xxxxxxxxxxxxxxxxxxxx >[mailto:uclinux-dist-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On >Behalf Of Alan Stern >Sent: Wednesday, June 03, 2009 10:04 PM >To: Mike Frysinger >Cc: uclinux-dist-devel@xxxxxxxxxxxxxxxxxxxx; >felipe.balbi@xxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx >Subject: Re: [Uclinux-dist-devel] [PATCH 3/9] USB: musb: add >disable ping option to support some ill-behaviored usb stick > >On Wed, 3 Jun 2009, Mike Frysinger wrote: > >> From: Bryan Wu <cooloney@xxxxxxxxxx> >> >> Some USB stick does not answer PING correctly which will >make USB enumeration fail. >> We enable the NAK limit value to detect this PING issue, >then disable >> the PING option for such ill-behaviored usb sticks. > >Do these ill-behaved sticks work with a regular EHCI >controller? If not then there's no reason to add special code >to support them on MUSB. >If they do work then MUSB should behave the same way as EHCI, >which doesn't use the NAK limit value or disable PING. > After a talk with Bryan,he said ,through usb analyzer he found the EHCI also disables PING in this scenario. I will try to find out the evidence of it. Thanks Cliff > >_______________________________________________ >Uclinux-dist-devel mailing list >Uclinux-dist-devel@xxxxxxxxxxxxxxxxxxxx >https://blackfin.uclinux.org/mailman/listinfo/uclinux-dist-devel > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
