linux-kernel - Re: The possible regression in kernel 4.8 - clk: imx: correct AV PLL rate formula

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Message-ID: <CAOMZO5CXTEpNvAhuc2Et60HxfM=nQngMTdMOtDbazi=1EQ95Jw@mail.gmail.com>
Date:   Thu, 6 Oct 2016 20:37:50 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     "Ken.Lin" <ken.lin@...antech.com>
Cc:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "sboyd@...eaurora.org" <sboyd@...eaurora.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Peter.Stretz" <peter.stretz@...antech.com>,
        "Peter.Chiang" <peter.chiang@...antech.com>,
        Akshay Bhat <akshay.bhat@...esys.com>,
        Jason Moss <jason.moss@....com>, emil@...esaudio.com
Subject: Re: The possible regression in kernel 4.8 - clk: imx: correct AV PLL
 rate formula

Hi Ken,

On Thu, Oct 6, 2016 at 8:26 PM, Ken.Lin <ken.lin@...antech.com> wrote:
> Hi,
>
> We found a possible regression issue (not seen in kernel 4.7-stable), which has to do with the new NXP commit ba7f4f557eb67ee21c979c8539dc1886f5d5341c when we did a DP test (1920x1080@60) with clock source PLL5.
> The DP desired pixel clock (148.5MHz that is calculated from the input of PLL output frequency) would be correct again when we reverted this commit.
> Could you please help check if the commit has the side effect since it would have impacts on our on-going project when it requires moving from kernel 4.7 to kernel 4.8 or newer version?
>
> Please check the following URL for the details
> https://www.dropbox.com/s/7wc5jdp8unlsiob/possible_regression_for_clk_imx_correct_VL_PLL_rate_formula.pdf?dl=0

Do these patches from Emil fix the issue?

http://www.spinics.net/lists/arm-kernel/msg535204.html

and

http://www.spinics.net/lists/arm-kernel/msg535203.html

Thanks