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ARM: dts: msm: Defer regulator disable for msm8998 GPU SMMU

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IOMMU driver takes vote on regulator for every unmap, attach or
detach call and removes it once done.

This is an overhead if GPU is in power collapse mode and huge
number of unmap calls are pending from a given context. It would
end up in turning ON/OFF the regulator those many times.

To optimize this, do a deferred regulator disable about 80ms so that
all subsequent requests to regulator enable will be just refcounted.

Change-Id: I07709f5a0ce55298a5fe46ffd95bb8bc472e7069
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
This commit is contained in:
Hareesh Gundu 2017-06-22 14:50:55 +05:30
parent 560a996da5
commit f304b0a865
1 changed files with 1 additions and 0 deletions
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arch/arm/boot/dts/qcom/msm-arm-smmu-8998.dtsi
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@ -155,6 +155,7 @@
interrupts = <GIC_SPI 329 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 330 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 331 IRQ_TYPE_EDGE_RISING>;
qcom,deferred-regulator-disable-delay = <80>;
vdd-supply = <&gdsc_gpu_cx>;
clocks = <&clock_gcc clk_gcc_gpu_cfg_ahb_clk>,
<&clock_gcc clk_gcc_bimc_gfx_clk>,