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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 32314C32750 for ; Tue, 13 Aug 2019 22:36:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 01F92205C9 for ; Tue, 13 Aug 2019 22:36:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Jrl2rgKg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727332AbfHMWgx (ORCPT ); Tue, 13 Aug 2019 18:36:53 -0400 Received: from mail-pf1-f178.google.com ([209.85.210.178]:44731 "EHLO mail-pf1-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726698AbfHMWgw (ORCPT ); Tue, 13 Aug 2019 18:36:52 -0400 Received: by mail-pf1-f178.google.com with SMTP id c81so3399571pfc.11; Tue, 13 Aug 2019 15:36:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=mJjg+agyQMMusNhpHfXdEcabVsvoypkfvaemt2NLQGo=; b=Jrl2rgKgWlJkS1vJk1OKALCLNOonNZJAxKeI7jdn7W98mdiqekpWrA0+CnqN5MYMb5 4D8Hza7sYoH1Idnp5AOdNC2Q1D5nU6Zn6nKG0sPbDvgsF3VN0YIb2fFD7eDOeo8fY867 Wz3hkxO6OEoMX0yZk1hkas9zqBYJUrHL/ohCEQvcucWxcCHIQs824sPJRl4i2jxFYxmF Ypi7KJwhR2JkLFTlaySF4VEiS/wLvO98ppIiPHcJWIrhKUPV1m0TDnjzPUMiMtzPtLNH MojPvZbUSchxQ40Fabr4+HfMhusGXL33bTvzkEnN8eUV93ilAKweREBcoNdhbuUksaG0 aNZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=mJjg+agyQMMusNhpHfXdEcabVsvoypkfvaemt2NLQGo=; b=ckjqPjUHUMj57MzbfoxAacL1bcZsUkMaYjftAe2OlOZlqo0oiXXW+5/H3V8ieN0Mbu PtIyzjp48ulFVUdoVIopNUIxkc7ynQigPaJ2DLFISJtre+fuPKZljCdCbLXLyw7A51am B/2kAjy/C3/FyOJ0J2fG24vPjcj8wtmXYsznX9xpu4sjayP+VxNqzbTcVgaQ4w12hq1z eq1EJkWlFoxA3R3Dahd/GcY3UdndNWrxoA31Q9X6A2SgnYNFKrSE3TIUK/mERmVbu+O+ ivJqpWa7L7aRRiC1tJpe9foelUcmFFYabNBVezhkSqtgRPuZ8sj6ML7H/zaHONP5j1Ql ilzg== X-Gm-Message-State: APjAAAVLndN9X8qGOZ6K05YFv6OMGdIHw967uJzn53TVoodhuiq/PNWu sdH/OOJ7UCFrsAS1uzPXxhzqlRv8 X-Google-Smtp-Source: APXvYqzJTQ/17lMvJG2ROjPMrO073k+f6FbvHqChuE9J9oEWUWFCstj/Q+SWMtGdrJnovHv7T3r1Jw== X-Received: by 2002:a63:e10:: with SMTP id d16mr36605007pgl.444.1565735811417; Tue, 13 Aug 2019 15:36:51 -0700 (PDT) Received: from majic.sklembedded.com (c-73-202-231-77.hsd1.ca.comcast.net. [73.202.231.77]) by smtp.googlemail.com with ESMTPSA id 16sm48393441pfc.66.2019.08.13.15.36.50 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 13 Aug 2019 15:36:50 -0700 (PDT) From: Steve Longerbeam X-Google-Original-From: Steve Longerbeam To: linux-media@vger.kernel.org Cc: Sakari Ailus , Steve Longerbeam , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2] media: docs-rst: Clarify duration of LP-11 mode Date: Tue, 13 Aug 2019 15:36:44 -0700 Message-Id: <20190813223645.13720-1-steve_longerbeam@mentor.com> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Steve Longerbeam Add a sentence that makes it more clear when the CSI-2 transmitter must, if possible, exit LP-11 mode. That is, maintain LP-11 mode until stream on, at which point the transmitter activates the clock lane and transition to HS mode. Signed-off-by: Steve Longerbeam --- Changes in v2: - change wording "Only until stream on ..." to "Only at stream on ..." --- Documentation/media/kapi/csi2.rst | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/Documentation/media/kapi/csi2.rst b/Documentation/media/kapi/csi2.rst index a7e75e2eba85..f87c413cd433 100644 --- a/Documentation/media/kapi/csi2.rst +++ b/Documentation/media/kapi/csi2.rst @@ -49,9 +49,13 @@ where The transmitter drivers must, if possible, configure the CSI-2 transmitter to *LP-11 mode* whenever the transmitter is powered on but -not active. Some transmitters do this automatically but some have to -be explicitly programmed to do so, and some are unable to do so -altogether due to hardware constraints. +not active, and maintain *LP-11 mode* until stream on. Only at stream +on should the transmitter activate the clock on the clock lane and +transition to *HS mode*. + +Some transmitters do this automatically but some have to be explicitly +programmed to do so, and some are unable to do so altogether due to +hardware constraints. Stopping the transmitter ^^^^^^^^^^^^^^^^^^^^^^^^ -- 2.17.1