linux-kernel - [RFC PATCH 02/13] dt-bindings: msm/dsi: Document Display Stream Compression (DSC) parameters

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Date:   Fri, 21 May 2021 18:19:31 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org
Subject: [RFC PATCH 02/13] dt-bindings: msm/dsi: Document Display Stream Compression (DSC) parameters

DSC enables streams to be compressed before we send to panel. This
requires DSC enabled encoder and a panel to be present. So we add this
information in board DTS and find if DSC can be enabled and the
parameters required to configure DSC are added to binding document along
with example

Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 .../devicetree/bindings/display/msm/dsi.txt       | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/msm/dsi.txt b/Documentation/devicetree/bindings/display/msm/dsi.txt
index b9a64d3ff184..83d2fb92267e 100644
--- a/Documentation/devicetree/bindings/display/msm/dsi.txt
+++ b/Documentation/devicetree/bindings/display/msm/dsi.txt
@@ -48,6 +48,13 @@ Optional properties:
 - pinctrl-n: the "sleep" pinctrl state
 - ports: contains DSI controller input and output ports as children, each
   containing one endpoint subnode.
+- qcom,mdss-dsc-enabled: Display Stream Compression (DSC) is enabled
+- qcom,mdss-slice-height: DSC slice height in pixels
+- qcom,mdss-slice-width: DSC slice width in pixels
+- qcom,mdss-slice-per-pkt: DSC slices per packet
+- qcom,mdss-bit-per-component: DSC bits per component
+- qcom,mdss-bit-per-pixel: DSC bits per pixel
+- qcom,mdss-block-prediction-enable: Block prediction mode of DSC enabled
 
   DSI Endpoint properties:
   - remote-endpoint: For port@0, set to phandle of the connected panel/bridge's
@@ -188,6 +195,14 @@ Example:
 		qcom,master-dsi;
 		qcom,sync-dual-dsi;
 
+		qcom,mdss-dsc-enabled;
+		qcom,mdss-slice-height = <16>;
+		qcom,mdss-slice-width = <540>;
+		qcom,mdss-slice-per-pkt = <1>;
+		qcom,mdss-bit-per-component = <8>;
+		qcom,mdss-bit-per-pixel = <8>;
+		qcom,mdss-block-prediction-enable;
+
 		qcom,mdss-mdp-transfer-time-us = <12000>;
 
 		pinctrl-names = "default", "sleep";
-- 
2.26.3