linux-kernel - Re: [PATCH v2 3/5] clk: tegra: Ensure that PLLU configuration is applied properly

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Message-ID: <YAGxFbvrHHcOCZIW@ulmo>
Date:   Fri, 15 Jan 2021 16:13:25 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-tegra@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] clk: tegra: Ensure that PLLU configuration is
 applied properly

On Tue, Jan 12, 2021 at 03:27:22PM +0300, Dmitry Osipenko wrote:
> The PLLU (USB) consists of the PLL configuration itself and configuration
> of the PLLU outputs. The PLLU programming is inconsistent on T30 vs T114,
> where T114 immediately bails out if PLLU is enabled and T30 re-enables
> a potentially already enabled PLL (left after bootloader) and then fully
> reprograms it, which could be unsafe to do. The correct way should be to
> skip enabling of the PLL if it's already enabled and then apply
> configuration to the outputs. This patch doesn't fix any known problems,
> it's a minor improvement.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/clk/tegra/clk-pll.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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