Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755091AbcLNInj (ORCPT ); Wed, 14 Dec 2016 03:43:39 -0500 Received: from fllnx210.ext.ti.com ([198.47.19.17]:28291 "EHLO fllnx210.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752492AbcLNInh (ORCPT ); Wed, 14 Dec 2016 03:43:37 -0500 Subject: Re: [PATCH 12/23] drm: omapdrm: plane: update fifo size on atomic update To: Laurent Pinchart , References: <1457455195-1938-1-git-send-email-sre@kernel.org> <1457455195-1938-13-git-send-email-sre@kernel.org> <8209536.SBuD0B7HP3@avalon> CC: Sebastian Reichel , Tony Lindgren , Aaro Koskinen , , From: Tomi Valkeinen Message-ID: <4c863692-d6d4-3940-b78e-3e7b9d114cad@ti.com> Date: Wed, 14 Dec 2016 10:43:18 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <8209536.SBuD0B7HP3@avalon> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="xXiuDnCtLIaXRbXfrvSu3jA2tSBWg7Fd5" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2643 Lines: 68 --xXiuDnCtLIaXRbXfrvSu3jA2tSBWg7Fd5 Content-Type: multipart/mixed; boundary="a1BueXqdL9Uxn1xC3qGo8tapBJU2nak2V"; protected-headers="v1" From: Tomi Valkeinen To: Laurent Pinchart , dri-devel@lists.freedesktop.org Cc: Sebastian Reichel , Tony Lindgren , Aaro Koskinen , linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org Message-ID: <4c863692-d6d4-3940-b78e-3e7b9d114cad@ti.com> Subject: Re: [PATCH 12/23] drm: omapdrm: plane: update fifo size on atomic update References: <1457455195-1938-1-git-send-email-sre@kernel.org> <1457455195-1938-13-git-send-email-sre@kernel.org> <8209536.SBuD0B7HP3@avalon> In-Reply-To: <8209536.SBuD0B7HP3@avalon> --a1BueXqdL9Uxn1xC3qGo8tapBJU2nak2V Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 13/12/16 19:35, Laurent Pinchart wrote: > Hi Sebastian, >=20 > Thank you for the patch. >=20 > On Tuesday 08 Mar 2016 17:39:44 Sebastian Reichel wrote: >> This is a workaround for a hardware bug occuring >> on OMAP3 with manually updated panels. >=20 > Could you please explain what the bug is and how the workaround operate= s ? Do=20 > you have a reference to an errata document ? I don't think I ever found out exactly why the problem happens. But on OMAP3 DSI, the fifo thresholds had to be tuned slightly, otherwise DISPC would stop. dispc_ovl_compute_fifo_thresholds() does that tuning if "manual_update" parameter is set on OMAP3. Tomi --a1BueXqdL9Uxn1xC3qGo8tapBJU2nak2V-- --xXiuDnCtLIaXRbXfrvSu3jA2tSBWg7Fd5 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJYUQYmAAoJEPo9qoy8lh71x+sQAKt1hGj4J6ZOy5iqntyzRHkM Wixci6A/67VZ6PR16gE6V09XDFvim7mQSIDfgK+xR1S1Lg4ypZiuHWNloxxSQ6WD m4crWOBLHURmBss0lDiJB2PFCqzBo0M2SVhcBJjTh5K2MavohPdWQKKuU2l6hI4c dAnTdE8Ka+RgiO5UsRau8s/fTm3Itg6/nTSTvZyHRKI44Xs4Wizo0EsLDSPiwX0T R6dYVtrqHM53xrrxRpbI+bJHwBoK+pCugNROlU/fLlzc/O6NOsRI0utAq9+8zjE/ JfMGZ0X+HkAMW8sqMi31cqEid75rhIBofPbW4gldEZ/O+HmBB0knql9iq+iNZGc0 wK4eK+5bEjpG0thl9walST/DNejrdEkz33pe9j3T9bV8jg2xhNdYxrR6zfAN8gYt LnMcvv7UrFV6HTqy5esTCk1JtMb0cQkMwmsjGkot1kx7ZKMfZROLo3/tGTqceTXd X30dxu5ECMIxtzFaUWztNCu4geXuoMVbnBF/LX1Iea6LEsGgCHlTYxEYC7F9TcXO GApr+UXpwkHSWAg4pWieheCRHoVWMElt7rxUoF0UeQ0S7vs7zZEfXnk42MvcwBsg kQYfJZfJ2x1RCIdpjRwMpdV7xmDifo6QRaO6YMRVAHJMZtjXA+UVXgc7aW0r0EBJ VpQKh1/qyAOydhOFEVB8 =ncDS -----END PGP SIGNATURE----- --xXiuDnCtLIaXRbXfrvSu3jA2tSBWg7Fd5--