From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: EHCI and MUSB do not discover devices without CONFIG_PM Date: Tue, 28 Nov 2017 09:16:48 -0800 Message-ID: <20171128171648.GF28152@atomide.com> References: <20171127220833.GA10070@lenoch> <20171128073328.GF10757@kroah.com> <20171128085751.GA28256@lenoch> <20171128093054.GA20720@kroah.com> <20171128093948.GA21766@lenoch> <20171128141131.GR28152@atomide.com> <20171128142851.GA12849@lenoch> <20171128143913.GS28152@atomide.com> <20171128165802.GA2186@lenoch> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20171128165802.GA2186@lenoch> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ladislav Michl Cc: Greg KH , linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-omap@vger.kernel.org * Ladislav Michl [171128 17:01]: > On Tue, Nov 28, 2017 at 06:39:13AM -0800, Tony Lindgren wrote: > > Limiting things to C1 with cpuidle is probably what you need > > for having USB also working. > > With echo 1 > /sys/devices/system/cpu/cpu0/cpuidle/state{1-6}/disable > jitter is about 100us which is about 3x worse than with CONFIG_PM > disabled (and much better when idling), but decoder works with > occassional errors. OK sounds like there is still something happening in the idle path beyond WFI then. > Anyway, it would be nice to find out why USB does not work with CONFIG_PM > disabled :) Sure. Tony -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html