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QTI MDSS Rotator
MDSS rotator is a rotator driver, which manages the rotator hw
block inside the Mobile Display Subsystem.
Required properties
- compatible : Must be "qcom,mdss-rotator".
- qcom,mdss-wb-count: The number of writeback block
in the hardware
- <name>-supply: Phandle for <name> regulator device node.
Bus Scaling Data:
- qcom,msm-bus,name: String property describing MDSS client.
- qcom,msm-bus,num-cases: This is the the number of Bus Scaling use cases
defined in the vectors property. This must be
set to <3> for MDSS driver where use-case 0 is
used to take off MDSS BW votes from the system.
And use-case 1 & 2 are used in ping-pong fashion
to generate run-time BW requests.
- qcom,msm-bus,num-paths: This represents the number of paths in each
Bus Scaling Usecase. This value depends on
how many number of AXI master ports are
dedicated to MDSS for particular chipset.
- qcom,msm-bus,vectors-KBps: * A series of 4 cell properties, with a format
of (src, dst, ab, ib) which is defined at
Documentation/devicetree/bindings/arm/msm/msm_bus.txt
* Current values of src & dst are defined at
include/linux/msm-bus-board.h
src values allowed for MDSS are:
22 = MSM_BUS_MASTER_MDP_PORT0
23 = MSM_BUS_MASTER_MDP_PORT1
25 = MSM_BUS_MASTER_ROTATOR
dst values allowed for MDSS are:
512 = MSM_BUS_SLAVE_EBI_CH0
ab: Represents aggregated bandwidth.
ib: Represents instantaneous bandwidth.
* Total number of 4 cell properties will be
(number of use-cases * number of paths).
* These values will be overridden by the driver
based on the run-time requirements. So initial
ab and ib values defined here are random and
bare no logic except for the use-case 0 where ab
and ib values needs to be 0.
* Define realtime vector properties followed by
non-realtime vector properties.
Optional properties
- qcom,mdss-has-reg-bus: Boolean property to indicate
if rotator needs to vote for register bus. This
property is needed starting 8996
- qcom,mdss-has-ubwc: Boolean property to indicate
if the hw supports universal
bandwidth compression (ubwc)
- qcom,mdss-has-downscale Boolean property to indicate
if the hw supports downscale
- qcom,sde-reg-bus: Subnode to provide Bus scaling for register access for
rotator
Example:
mdss_rotator: qcom,mdss_rotator {
compatible = "qcom,mdss_rotator";
qcom,mdss-has-downscale;
qcom,mdss-has-ubwc;
qcom,mdss-wb-count = <2>;
qcom,mdss-has-reg-bus;
/* Bus Scale Settings */
qcom,msm-bus,name = "mdss_rotator";
qcom,msm-bus,num-cases = <3>;
qcom,msm-bus,num-paths = <1>;
qcom,mdss-num-nrt-paths = <1>;
qcom,msm-bus,vectors-KBps =
<25 512 0 0>,
<25 512 0 6400000>,
<25 512 0 6400000>;
vdd-supply = <&gdsc_mdss>;
gdsc-mmagic-mdss-supply = <&gdsc_mmagic_mdss>;
qcom,supply-names = "vdd", "gdsc-mmagic-mdss";
qcom,sde-reg-bus {
/* Reg Bus Scale Settings */
qcom,msm-bus,name = "mdss_rot_reg";
qcom,msm-bus,num-cases = <4>;
qcom,msm-bus,num-paths = <1>;
qcom,msm-bus,active-only;
qcom,msm-bus,vectors-KBps =
<1 590 0 0>,
<1 590 0 76800>,
<1 590 0 160000>,
<1 590 0 320000>;
};
};
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