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* [PATCH v2] media: docs-rst: Clarify duration of LP-11 mode
@ 2019-08-13 22:36 Steve Longerbeam
  0 siblings, 0 replies; only message in thread
From: Steve Longerbeam @ 2019-08-13 22:36 UTC (permalink / raw)
  To: linux-media
  Cc: Sakari Ailus, Steve Longerbeam, Mauro Carvalho Chehab, linux-kernel

From: Steve Longerbeam <slongerbeam@gmail.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@gmail.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


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