linux-kernel - Re: [PATCH v2] clk: qcom: clk-alpha-pll: Don't reconfigure running Trion

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Message-ID: <YZ2+Nh0oiawTL/tQ@matsya>
Date:   Wed, 24 Nov 2021 09:53:18 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        Robert Foss <robert.foss@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clk: qcom: clk-alpha-pll: Don't reconfigure running
 Trion

On 23-11-21, 08:25, Bjorn Andersson wrote:
> In the event that the bootloader has configured the Trion PLL as source
> for the display clocks, e.g. for the continuous splashscreen, then there
> will also be RCGs that are clocked by this instance.
> 
> Reconfiguring, and in particular disabling the output of, the PLL will
> cause issues for these downstream RCGs and has been shown to prevent
> them from being re-parented.
> 
> Follow downstream and skip configuration if it's determined that the PLL
> is already running.

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

-- 
~Vinod