From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Packard Subject: Re: [PATCH v3] pass ELD to HDMI/DP audio driver Date: Sat, 06 Aug 2011 13:02:02 -0700 Message-ID: References: <20110804094024.GB21137@localhost> <20110805124958.GA9531@localhost> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2146517067==" Return-path: In-Reply-To: <20110805124958.GA9531@localhost> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Wu Fengguang Cc: "alsa-devel@alsa-project.org" , "Wang, Zhenyu Z" , "intel-gfx@lists.freedesktop..." , "dri-devel@lists.freedesktop.org" , Ben Skeggs , Christopher White , Jeremy Bush , "Bossart, Pierre-louis" List-Id: alsa-devel@alsa-project.org --===============2146517067== Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha1; protocol="application/pgp-signature" --=-=-= Content-Transfer-Encoding: quoted-printable > Good questions! In general the audio functionalities should not > depend on the display activeness. There are even audio-only HDMI > devices. So I'll need to make intel_write_eld() work even without > information about the current display mode. Yeah, we'll need to figure out what the ELD should look like with no display active. I think you've got the whole link available, so there shouldn't be any restrictions on formats. > That would be a good feature. For one thing, I find it annoying that > the music playback fades out when the screen goes to power saving > mode.. I'm not sure we can make it completely seamless without keeping most of the pipe active (which will consume some power). Probably we'll just leave the clock alone while the display is DPMS'd, but if we actually need the resources for another display, I'm afraid there may be some noise on the HDMI audio link. Will need experimentation to figure out how to make this work as nicely as possible. I was just reading through the reference manual and found that there is a mode that leaves the HDMI running without requiring a pipe or plane, just the FDI PLL. So, audio without display seems pretty simple now; just a matter of a bit of API negotiation between the audio and video drivers. =2D-=20 keith.packard@intel.com --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iD8DBQFOPZ27Qp8BWwlsTdMRAlhOAJ4rIzqeSk/gqAA1ExuKN/u9trt4PwCfat5S N1zMTgES3fP2nndbbqoF+MQ= =2YiS -----END PGP SIGNATURE----- --=-=-=-- --===============2146517067== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel --===============2146517067==--