From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Ujfalusi Subject: Re: 3.19 on Nokia n900: audio quality awful Date: Mon, 26 Jan 2015 15:20:28 +0200 Message-ID: <54C63F1C.6010703@ti.com> References: <20150106170433.GA5408@amd> <20150118120139.GA1509@amd> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20150118120139.GA1509@amd> Sender: linux-kernel-owner@vger.kernel.org To: Pavel Machek , pali.rohar@gmail.com, sre@debian.org, sre@ring0.de, kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org, aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com, jarkko.nikula@bitmer.com List-Id: linux-omap@vger.kernel.org On 01/18/2015 02:01 PM, Pavel Machek wrote: > Hi! >=20 > If you have any idea about playback problems, help would be still > welcome. I'll have to do bisect, otherwise, and it will not be easy. >=20 >> In 3.18, sound is nice and clear. >> >> In 3.19, sound is unusable. It produces nasty tone when it should be >> quiet, and there's at least as much noise as is sound. >> >> Unfortunately, list of mixers also changed (and there's cca 120 >> settings), but a) it does not work with the old list and b) nothing = I >> could figure out did make the sound usable. Some setting resulted in >> even more noise. >> >> Any idea what could have caused it? >=20 > I tried audio recording this time. >=20 > In 2.6.28-nokia, it is neccessary to set "Input select" na "digital > mic", then it works. Input select being in "playback" option makes it > easy to miss. >=20 > In 3.18 and 3.19-rc3, all I can record are zeros. >=20 > Does playback/recording work for you on OMAP 3430-based machines? Same codec (tlv320aic3106) works fine on my am335x and omap-l138 boards= =2E BeagleBoard-xM also fine with twl4030 codec. I don't have my n900 in hacking mode (it is still in use time-to-time) = but looking at the dts file: you might want to add ai3x-micbias-vg property= to the aic3x nodes to select the correct mic bias voltage. I can't recall what= is appropriate for n900, but 2.6.28-nokia sources might give you the answe= r. --=20 P=E9ter