From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pali =?utf-8?q?Roh=C3=A1r?= Subject: Re: Nokia N900 - audio TPA6130A2 problems Date: Tue, 5 Jan 2016 00:34:12 +0100 Message-ID: <201601050034.12810@pali> References: <201507251228.27128@pali> <55BFB77C.6000208@bitmer.com> <55C0638F.30000@ti.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1907339.mtUAciBVlV"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55C0638F.30000@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Peter Ujfalusi Cc: Jarkko Nikula , Lars-Peter Clausen , linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, Pavel Machek , Sebastian Reichel , Aaro Koskinen , Tony Lindgren , Nishanth Menon , Ivaylo Dimitrov , merlijn@wizzup.org List-Id: linux-omap@vger.kernel.org --nextPart1907339.mtUAciBVlV Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Tuesday 04 August 2015 09:02:39 Peter Ujfalusi wrote: > On 08/03/2015 09:48 PM, Jarkko Nikula wrote: > > It is well possible that some regression got introduced to > > TPA6130A2 I2C communication over the years without nobody than you > > now notices. We used to do QA back in Meego N900 days but that was > > pre 3.x kernels. >=20 > No major changes has been done to the tpa driver during the past > years... I wanted to do some updates, like moving it to regmap, but > as you said, n900 is the only user (and n9) and I do not feel > comfortable to hack on a device where I do not have serial > console... And I'm using the n900 time to time also. >=20 > >> So maybe something similar? Kernel expects that some PM or > >> regulator parts are initialized, but they are only sometimes? > >> Just speculation... > >=20 > > I'm thinking the same. I could figure SCL could be stuck low if TPA > > or some other chip connected to the same I2C bus is without power > > and is pulling I2C signals down. >=20 > What would happen with the SCL stuck on i2c.2 bus if you remove the > tpa driver from the kernel? If you remove the other drivers for the > devices on i2c.2? Hi Peter and Jarkko! Do you have some code samples for testing? Or=20 something else which I can test? This problem is still reproducible on=20 more N900 devices and I would like to see it fixed. =2D-=20 Pali Roh=C3=A1r pali.rohar@gmail.com --nextPart1907339.mtUAciBVlV Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlaLAXQACgkQi/DJPQPkQ1KHTgCgwqp1CmhZXTVWk1hrngJUp9Vq PsMAoLxcu/yZTqKg8IxvN4MN29ElES2O =jWRJ -----END PGP SIGNATURE----- --nextPart1907339.mtUAciBVlV--