From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753263AbcD0QX6 (ORCPT ); Wed, 27 Apr 2016 12:23:58 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:50104 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752463AbcD0QX5 (ORCPT ); Wed, 27 Apr 2016 12:23:57 -0400 Date: Wed, 27 Apr 2016 17:23:44 +0100 From: Mark Brown To: Peter Rosin Cc: Nicolas Ferre , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Message-ID: <20160427162344.GA3217@sirena.org.uk> References: <1461747993-11516-1-git-send-email-peda@axentia.se> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="exZFuA0xp9ffbpTM" Content-Disposition: inline In-Reply-To: <1461747993-11516-1-git-send-email-peda@axentia.se> X-Cookie: Tomorrow, you can be anywhere. User-Agent: Mutt/1.5.24 (2015-08-30) X-SA-Exim-Connect-IP: 2a01:348:6:8808:fab::3 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Re: [PATCH] ASoC: atmel_ssc_dai: note buggy I2S support when the codec masters LRCLK X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --exZFuA0xp9ffbpTM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Apr 27, 2016 at 11:06:33AM +0200, Peter Rosin wrote: > While the start condition is correct for the left channel word in the I2S > case, it is not correct that the right channel word follows immediately > after the left channel word. The start of the right channel word should > be triggered by a rising edge on LRCLK in the I2S case, something which > simply does not happen. Almost every programmable serial port does this, it's a very common issue which is why we always try to go for exact clocking where we can - it greatly improves the interoperability for I2S if there are no dead clocks. --exZFuA0xp9ffbpTM Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJXIOePAAoJECTWi3JdVIfQroEH/iNCF4oV5LeTXOuSvnSQC2gp UPmE3Nslut1u/L7R3k6DPPWqkrLhxE9K9imVIqBvEFB+vOPEwhodm/E+1dLXS8Vf zsh1nmmtiVBK7tOpVaPteyt6cKeKJsCkVbwj9RKx2SYTmZGJsNl5uIhqnemKeI71 7AncjhbT3V7QCb57JbCXSd/gPi2v76Otr+zcx+YL5zFIxJjel86ebxImxlB9dwLG H1EQEoe7YvchM3rByeel8tcth/enD1MI6JFlWhbGX/sI1wbyK8jA6F+x2MsBBKwH TgtTBqa87Sfajw/TvGUwN/pjNyFQzCgaMq0CDwRrnV+QB/T9iv4/DlYzR+CcbZ8= =J6Bw -----END PGP SIGNATURE----- --exZFuA0xp9ffbpTM--