Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Steve Longerbeam <slongerbeam@gmail.com>
To:     linux-media@vger.kernel.org
Cc:     Sakari Ailus <sakari.ailus@linux.intel.com>,
        Steve Longerbeam <slongerbeam@gmail.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] media: docs-rst: Clarify duration of LP-11 mode
Date:   Sun, 11 Aug 2019 10:36:20 -0700
Message-Id: <20190811173621.20454-1-slongerbeam@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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 <slongerbeam@gmail.com>
---
 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..6cd1d4b0df17 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 until
+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