linux-kernel - Re: [PATCH] regulator: qcom-smd: Batch up requests for disabled regulators

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Date:   Tue, 22 Jan 2019 14:57:46 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] regulator: qcom-smd: Batch up requests for disabled
 regulators

On 1/22/2019 12:01 PM, Bjorn Andersson wrote:
> In some scenarios the early stages of the boot chain has configured
> regulators to be in a required state, but the later stages has skipped
> to inform the RPM about it's requirements.
> 
> But as the SMD RPM regulators are being initialized voltage change
> requests will be issued to align the voltage with the valid ranges. The
> RPM aggregates all parameters for the specific regulator, the voltage
> will be adjusted and the "enabled" state will be "off" - and the
> regulator is turned off.
> 
> This patch addresses this problem by caching the requested enable state,
> voltage and load and send the parameters in a batch, depending on the
> enable state - effectively delaying the voltage request for disabled
> regulators.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>

This happens to fix an annoyance I've been avoiding on 8998.

Reviewed-by: Jeffrey Hugo <jhugo@...eaurora.org>
Tested-by: Jeffrey Hugo <jhugo@...eaurora.org>

-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.