From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E1AD1C25B76 for ; Mon, 3 Jun 2024 11:47:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: MIME-Version:List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe :List-Id:In-Reply-To:References:Subject:To:From:Cc:Message-Id:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=qXX5Ld9Fg2rLMX9L8udCXAmrBqPaA8j6tQ+ttGqERAY=; b=bKOq1kuiGYLLTl9RXli4Rp9N2z sfhpxox2HcmPpAqDDDYo2KF8uw4X13uwuvsX8Mhpxw2M1qS9aGW7t9uT73Rjon0eglXv3xwO0Wf0/ +CliRB6r5XEyDRUT7OK2d3OvJGSOyP6BGOFVlB7yKUB2bzRnUDp+6IwGG9X46rZCKWEHbjYYCtPgK tbw1bqQnYPI2j1Cyf/Q8n3CqC1ov3uZExLIeR55BGzLFPIS3ta50tikIcTd+3jTTo2v9PxovUfSMk II2Lipm9NhGjS4ozkDAJeIg1CK138r2bccaiNoU71u7Un/YHgYSrX81v9s2IY+yPx6Q2pvigfGSUQ nbmJGz7A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sE69v-0000000GZr6-3uUL; Mon, 03 Jun 2024 11:47:27 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sE69t-0000000GZps-2PBu; Mon, 03 Jun 2024 11:47:27 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id E83EC60D2B; Mon, 3 Jun 2024 11:47:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 419B4C4AF09; Mon, 3 Jun 2024 11:47:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717415244; bh=3Im1QpDdWkDh0sb6TFhqrVvzJ24+046kZtmwGLRL/Jk=; h=Date:Cc:From:To:Subject:References:In-Reply-To:From; b=tSlPDIH/gvTaPGlTgTDQUmrEB6CAdfgyZ/5kDLkDs7vbBlI/Pymu4Om48sGbmFPCA 6+CD1r/ZA4L81E/q6P6S+Gjq8DOZ2aHj9JaX1aXHiE2SuUADHKMCiYxTL+ScKsC/8Q Yt9q3mq7nVNVyYlWYCjxk4m9jWeVym667qQr0rKxw3FvC+EhhsA9N0M10phRAR6tP1 uHp/pSygLH1l6mqFqTsbE69SC9gN9OS1b+L4uNN3DBE7oTYvPh7m8zS/IBkR4sgOc4 KF+4Rn+j5gueKjR1/4oCmeX0acmRsUUFVxPBFmogw46N+kd6KbppQf1fAnzf3dQ3cq 5QZbui0BORiVQ== Date: Mon, 03 Jun 2024 13:47:20 +0200 Message-Id: Cc: "Daniel Semkowicz" , , , , From: "Michael Walle" To: "Michael Walle" , "Andrzej Hajda" , "Neil Armstrong" , "Robert Foss" , "Laurent Pinchart" , "Jonas Karlman" , "Jernej Skrabec" , "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , "David Airlie" , "Daniel Vetter" , "Chun-Kuang Hu" , "Philipp Zabel" , "Matthias Brugger" , "AngeloGioacchino Del Regno" , "Sam Ravnborg" , "Vinay Simha BN" , "Tony Lindgren" Subject: Re: [PATCH 00/20] drm/bridge: tc358775: proper bridge bringup and code cleanup X-Mailer: aerc 0.16.0 References: <20240506-tc358775-fix-powerup-v1-0-545dcf00b8dd@kernel.org> In-Reply-To: <20240506-tc358775-fix-powerup-v1-0-545dcf00b8dd@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240603_044725_785261_337BC4F0 X-CRM114-Status: GOOD ( 18.09 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============4860575078683431881==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============4860575078683431881== Content-Type: multipart/signed; boundary=65f0fc295269b97015ccf49f95fa8248b459b679f76c7412027362baf4cb; micalg=pgp-sha384; protocol="application/pgp-signature" --65f0fc295269b97015ccf49f95fa8248b459b679f76c7412027362baf4cb Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 On Mon May 6, 2024 at 3:34 PM CEST, Michael Walle wrote: > This patchset fixes the bridge initialization according to the > datasheet. Not sure how that even worked before. Maybe because the > initialization was done prior to linux (?). > > The bridge has some peculiarities: > (1) The reset has to be deasserted in LP-11 mode > (2) For I2C access the bridge needs the DSI clock > (3) The bridge has to be configured while the video stream is > disabled. > (4) The bridge has limitations on the display timings. In particular, > the horizontal pulse width has to be at least 8 pixels wide and > both the horizontal pulse width as well as the back porch has to > be even. According to the datasheet the horizontal front porch as > well but in line sync mode, this is ignored. Also line sync is the > only supported mode for this bridge, therefore, the front porch > is always ignored. > > The most controversial patch is probably "drm/bridge: add > dsi_lp11_notify mechanism" which is needed for (1) above. Some time ago > there was a series [1] to add a manual power-up, which was abandoned and > which didn't suite the needs for this bridge anyway. > > Also, this will gradually change the tc_ prefix to tc358775_ while the > functions are refactored. > > The bridge was successfully tested on a Mediatek MT8195 SoC with the > following panels: > - Innolux G101ICE > - AUO G121EAN01.0 > - Innolux G156HCE (dual-link LVDS) > > [1] https://lore.kernel.org/r/20231016165355.1327217-1-dmitry.baryshkov@l= inaro.org/ Any comments on this series, besides the discussion on how to do the reset during LP11? Most of the other patches should be more or less self contained. -michael --65f0fc295269b97015ccf49f95fa8248b459b679f76c7412027362baf4cb Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iKgEABMJADAWIQTIVZIcOo5wfU/AngkSJzzuPgIf+AUCZl2tSBIcbXdhbGxlQGtl cm5lbC5vcmcACgkQEic87j4CH/gPqAGAvrp3hTLYUbjIYBOpNYq9pcLyYAkX0L1M pnxRMxFhmPLqiUGqptlFhUG/89N83cXRAYDf5X6gn9jZ6lVGmpOmSM8iYxeTgaBT q/FJmhXj6+H0qREQl40LYeF7XWWiPR5wO9c= =K1xu -----END PGP SIGNATURE----- --65f0fc295269b97015ccf49f95fa8248b459b679f76c7412027362baf4cb-- --===============4860575078683431881== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============4860575078683431881==--