linux-kernel - [PATCH v2] media: docs-rst: Clarify duration of LP-11 mode

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Message-Id: <20190813223645.13720-1-steve_longerbeam@mentor.com>
Date:   Tue, 13 Aug 2019 15:36:44 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     linux-media@...r.kernel.org
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] media: docs-rst: Clarify duration of LP-11 mode

From: Steve Longerbeam <slongerbeam@...il.com>

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@...il.com>
---
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