From: Jeykumar Sankaran <jsa...@codeaurora.org>
Adds mdp transfer time to msm dsi binding
Changes in v3:
- Added Rob's R-b
Reviewed-by: Rob Herring <r...@kernel.org>
Signed-off-by: Jeykumar Sankaran <jsa...@codeaurora.org>
Signed-off-by: Rajesh Yadav <rya...@codeaurora.org>
Signed-off-by: Sean Paul <seanp...@chromium.org>
---
.../devicetree/bindings/display/msm/dsi.txt | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/display/msm/dsi.txt
b/Documentation/devicetree/bindings/display/msm/dsi.txt
index 518e9cdf0d4b..d22237a88eae 100644
--- a/Documentation/devicetree/bindings/display/msm/dsi.txt
+++ b/Documentation/devicetree/bindings/display/msm/dsi.txt
@@ -121,6 +121,20 @@ Required properties:
Optional properties:
- qcom,dsi-phy-regulator-ldo-mode: Boolean value indicating if the LDO mode PHY
regulator is wanted.
+- qcom,mdss-mdp-transfer-time-us: Specifies the dsi transfer time for
command mode
+ panels in microseconds. Driver uses
this number to adjust
+ the clock rate according to the
expected transfer time.
+ Increasing this value would slow down
the mdp processing
+ and can result in slower performance.
+ Decreasing this value can speed up the
mdp processing,
+ but this can also impact power
consumption.
+ As a rule this time should not be
higher than the time
+ that would be expected with the
processing at the
+ dsi link rate since anyways this would
be the maximum
+ transfer time that could be achieved.
+ If ping pong split is enabled, this
time should not be higher
+ than two times the dsi link rate time.
+ If the property is not specified, then
the default value is 14000 us.
[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
[2] Documentation/devicetree/bindings/graph.txt
@@ -171,6 +185,8 @@ Example:
qcom,master-dsi;
qcom,sync-dual-dsi;
+ qcom,mdss-mdp-transfer-time-us = <12000>;
+
pinctrl-names = "default", "sleep";
pinctrl-0 = <&dsi_active>;
pinctrl-1 = <&dsi_suspend>;
--
Sean Paul, Software Engineer, Google / Chromium OS
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