From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Subject: Re: v3.4-rc4 DSS PM problem (Was: Re: Problems with 3.4-rc5) Date: Mon, 14 May 2012 10:55:38 +0300 Message-ID: <1336982138.2532.32.camel@lappyti> References: <1336033721.14378.2.camel@deskari> <1336050442.14378.10.camel@deskari> <1336139415.2552.4.camel@deskari> <1336140072.2552.6.camel@deskari> <1336143281.2552.21.camel@deskari> <1336143500.2552.23.camel@deskari> <1336483598.5761.45.camel@deskari> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-YYOR2/St+GOFcVnhhgBf" Return-path: Received: from na3sys009aog130.obsmtp.com ([74.125.149.143]:33016 "EHLO na3sys009aog130.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755095Ab2ENHzo (ORCPT ); Mon, 14 May 2012 03:55:44 -0400 Received: by lbbgg6 with SMTP id gg6so4368620lbb.22 for ; Mon, 14 May 2012 00:55:41 -0700 (PDT) In-Reply-To: Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Joe Woodward Cc: Paul Walmsley , khilman@ti.com, Archit Taneja , linux-omap@vger.kernel.org --=-YYOR2/St+GOFcVnhhgBf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2012-05-14 at 08:36 +0100, Joe Woodward wrote: > Any news on this? >=20 > This thread seems to have gone a little quiet... Hi, I've been doing testing to understand the problem, but so far I don't have any idea why things go wrong. I haven't found out any logic in which configuration works and which doesn't. Looks to me that for some reason the PM prevents DSS from getting data fast enough with certain fifo thresholds. I have two ways to avoid the problem, but I've been reluctant to make patches for those because I feel it's just hiding the problem. One way is to change DISPC SIDLEMODE or MIDLEMODE to disallow idle/standby. The other is to use certain fifo threshold values, which just seem to work for unknown reasons. Considering that we already have a SIDLEMODE hack in DSS for omap3 when using DSI, I wonder if the omap3 PM + DSS combination is just plain broken, and we should disallow idle. I'm not quite sure what are the implications of that. I'd appreciate comments from the PM people =3D). Tomi --=-YYOR2/St+GOFcVnhhgBf Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJPsLp6AAoJEPo9qoy8lh717jEP/R6AKDks+MP//OHf2eQwZFoe vnCzPGg7sk5N/b9jGMMANFtR6Tpr8fN/iE9dc0erXmfyMVwuVviwN4SQQb2275Pa QY1nBp5O3IXB27xU7i1kGELz3L/fqNZJ2yR0dWOA1BbU+0Z+MSRFIIH/fqzKrTrR YTnzFPc1Kv84pZu4+oI+GDlNiglaYSZMqtUCWkn8cJG6ZGIF6kJmU1M8SD93B8eZ gbRIFJtrOqdG/XaODQb/sM/9hAhe3Jz8cVUtOvXcRAg1cXufP2PLHi2X0ZKK747X RCAPDJb3dTdQeUm9lzMtl+UxPKBp/Kchwb5CXpRWekhoRq5qkeolueG/hWuYIiXr uIUQYb98P2nq/2faFEnUEgkieZEK31M5FjpHHir7UvmG5gzqQIz3VZBObmUjxCee QDXubp1mwcdwczA1XPRcYVkBltZZmeYbx9Ed6Txya8CiKg3RuIAZ2obwZJpZjZls mKNBcDgfTRMmMXMuh6zkLlhfhxtUiNOpjlYr+Yuc1DWVWGju9HI0ydQ+jeD6yN0Z gEhrlCGj67OrBXh0ta0XnlSfH0UBnA+6kvLy+jUYhvNLcYtT/so22taQ3by6E4Xn Lj2Lo35JwtoJhPRna+ZLdRrDduAAE23z0CVNlIrGhYDGYeW73S4+8bXfhe1wbSzi RPHTXi3nFwRcaMRQCrDf =Kx20 -----END PGP SIGNATURE----- --=-YYOR2/St+GOFcVnhhgBf--