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

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Message-Id: <20211203005928.52BEDC00446@smtp.kernel.org>
Date:   Thu, 02 Dec 2021 16:59:27 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Taniya Das <tdas@...eaurora.org>, Vinod Koul <vkoul@...nel.org>
Cc:     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

Quoting Bjorn Andersson (2021-11-23 08:25:08)
> 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.
> 
> Fixes: 59128c20a6a9 ("clk: qcom: clk-alpha-pll: Add support for controlling Lucid PLLs")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---

Applied to clk-fixes