This is a note to let you know that I've just added the patch titled
dt-bindings: display: sun4i: Add allwinner,tcon-channel property
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: dt-bindings-display-sun4i-add-allwinner-tcon-channel-property.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Apr 9 17:09:24 CEST 2018
From: Maxime Ripard maxime.ripard@free-electrons.com Date: Sat, 27 May 2017 18:09:34 +0200 Subject: dt-bindings: display: sun4i: Add allwinner,tcon-channel property
From: Maxime Ripard maxime.ripard@free-electrons.com
[ Upstream commit 22662f12768f971809b478386d9cc4947d00497a ]
The Allwinner Timings Controller has two, mutually exclusive, channels. When the binding has been introduced, it was assumed that there would be only a single user per channel in the system.
While this is likely for the channel 0 which only connects to LCD displays, it turns out that the channel 1 can be connected to multiple controllers in the SoC (HDMI and TV encoders for example). And while the simultaneous use of HDMI and TV outputs cannot be achieved, switching from one to the other at runtime definitely sounds plausible.
Add an extra property, allwinner,tcon-channel, to specify for a given endpoint which TCON channel it is connected to, while falling back to the previous mechanism if that property is missing.
Acked-by: Chen-Yu Tsai wens@csie.org Acked-by: Rob Herring robh@kernel.org Signed-off-by: Maxime Ripard maxime.ripard@free-electrons.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt | 11 ++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
--- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt @@ -47,10 +47,13 @@ Required properties: Documentation/devicetree/bindings/media/video-interfaces.txt. The first port should be the input endpoint, the second one the output
- The output should have two endpoints. The first is the block - connected to the TCON channel 0 (usually a panel or a bridge), the - second the block connected to the TCON channel 1 (usually the TV - encoder) + The output may have multiple endpoints. The TCON has two channels, + usually with the first channel being used for the panels interfaces + (RGB, LVDS, etc.), and the second being used for the outputs that + require another controller (TV Encoder, HDMI, etc.). The endpoints + will take an extra property, allwinner,tcon-channel, to specify the + channel the endpoint is associated to. If that property is not + present, the endpoint number will be used as the channel number.
On SoCs other than the A33, there is one more clock required: - 'tcon-ch1': The clock driving the TCON channel 1
Patches currently in stable-queue which might be from maxime.ripard@free-electrons.com are
queue-4.9/dt-bindings-display-sun4i-add-allwinner-tcon-channel-property.patch queue-4.9/drm-sun4i-ignore-the-generic-connectors-for-components.patch