linux-kernel - Re: [PATCH] clk: samsung: Prevent potential endless loop in the PLL set

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Message-ID: <bb483f3c-7d83-4807-aff2-7969a43121aa@samsung.com>
Date:   Fri, 7 Aug 2020 10:32:11 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>,
        linux-clk@...r.kernel.org
Cc:     tomasz.figa@...il.com, sboyd@...nel.org, mturquette@...libre.com,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        b.zolnierkie@...sung.com, m.szyprowski@...sung.com
Subject: Re: [PATCH] clk: samsung: Prevent potential endless loop in the PLL
 set_rate ops

Hi Sylwester,

On 8/7/20 1:06 AM, Sylwester Nawrocki wrote:
> In the .set_rate callback for some PLLs there is a loop polling state
> of the PLL lock bit and it may become an endless loop when something
> goes wrong with the PLL. For some PLLs there is already (duplicated)
> code for polling with a timeout. This patch refactors that code a bit
> and moves it to a common helper function which is then used
> in .set_rate callbacks for all the PLLs.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> ---
>  drivers/clk/samsung/clk-pll.c | 94 +++++++++++++----------------------
>  1 file changed, 35 insertions(+), 59 deletions(-)
> 

(snip)

It fix the infinite loop and unify the duplicate code.
It looks good to me. Thanks.

Acked-by: Chanwoo Choi <cw00.choi@...sung.com>


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics