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Date: Thu, 17 Mar 2016 15:50:37 +0200 From: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com> To: Tony Lindgren <tony@...mide.com> Cc: Pali Rohár <pali.rohar@...il.com>, Sebastian Reichel <sre@...nel.org>, Grygorii Strashko <grygorii.strashko@...com>, Peter Ujfalusi <peter.ujfalusi@...com>, Jarkko Nikula <jarkko.nikula@...mer.com>, Lars-Peter Clausen <lars@...afoo.de>, linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org, Pavel Machek <pavel@....cz>, Aaro Koskinen <aaro.koskinen@....fi>, Nishanth Menon <nm@...com>, merlijn@...zup.org Subject: Re: Nokia N900 - audio TPA6130A2 problems Hi, On 17.03.2016 15:33, Tony Lindgren wrote: > > Check the schematics. If the hardware has external pull-ups on a > line then don't enable the internal pull-ups. Otherwise both the > external and intenal pulls are parallel the pull value will be > wrong. My guess is that on n900 all the i2c lines have external > pulls. There are, 1k connected to VIO_18, but still, stock Nokia kernel enables the internal pull-ups as well. I doubt Nokia devs did that by mistake. Could it be that VIO_18 is disabled by the time TPA6130A2 is probed? Also, what is the problem to have both internal and external pull-ups in parallel? Regards, Ivo
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