linux-kernel - Re: [PATCH] clk: qcom: rcg2: Cache rate changes for parked RCGs

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Date:   Tue, 7 Dec 2021 12:37:04 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Amit Nischal <anischal@...eaurora.org>,
        Taniya Das <tdas@...eaurora.org>, dmitry.baryshkov@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: rcg2: Cache rate changes for parked RCGs

On 02-12-21, 19:56, Bjorn Andersson wrote:
> As GDSCs are turned on and off some associated clocks are momentarily
> enabled for house keeping purposes. Failure to enable these clocks seems
> to have been silently ignored in the past, but starting in SM8350 this
> failure will prevent the GDSC to turn on.
> 
> At least on SM8350 this operation will enable the RCG per the
> configuration in CFG_REG. This means that the current model where the
> current configuration is written back to CF_REG immediately after

s/CF_REG/CFG_REG

> parking the RCG doesn't work.
> 
> Instead, keep track of the currently requested rate of the clock and
> upon enabling the clock reapply the configuration per the saved rate.

With that fixed:

Reviewed-by: Vinod Koul <vkoul@...nel.org>

-- 
~Vinod