linux-kernel - Re: [PATCH 1/1] clk: meson: pll: fix rounding and setting a rate that matches precisely

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Date:   Mon, 25 Mar 2019 10:48:35 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        narmstrong@...libre.com, linux-amlogic@...ts.infradead.org,
        linux-clk@...r.kernel.org
Cc:     mturquette@...libre.com, sboyd@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] clk: meson: pll: fix rounding and setting a rate
 that matches precisely

On Sun, 2019-03-24 at 17:43 +0100, Martin Blumenstingl wrote:
> Make meson_clk_pll_is_better() consider a rate that precisely matches
> the requested rate to be better than any previous rate (which was
> smaller than the current).
> 
> Prior to commit 8eed1db1adec6a ("clk: meson: pll: update driver for the
> g12a") meson_clk_get_pll_settings() returned early (before calling
> meson_clk_pll_is_better()) if the rate from the current iteration
> matches the requested rate precisely. After this commit
> meson_clk_pll_is_better() is called unconditionally. This requires
> meson_clk_pll_is_better() to work with the case where "now == rate".
> 
> This fixes a hang during boot on Meson8b / Odroid-C1 for me.
> 
> Fixes: 8eed1db1adec6a ("clk: meson: pll: update driver for the g12a")
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

Good catch !

Reviewed-by: Jerome Brunet <jbrunet@...libre.com>