Subject: Re: [PATCH] clk: imx: lpcg: write twice when writing lpcg regs

From: Shawn Guo <[email-masked]>
Date: Fri, 13 Sep 2019 11:42:14 +0800

On Tue, Sep 10, 2019 at 02:47:59AM +0000, Anson Huang wrote:
> 
> 
> > On Sat, Sep 7, 2019 at 9:47 PM Stephen Boyd <[email-masked]> wrote:
> > >
> > > Quoting Peng Fan (2019-08-27 01:17:50)
> > > > From: Peng Fan <[email-masked]>
> > > >
> > > > There is hardware issue that:
> > > > The output clock the LPCG cell will not turn back on as expected,
> > > > even though a read of the IPG registers in the LPCG indicates that
> > > > the clock should be enabled.
> > > >
> > > > The software workaround is to write twice to enable the LPCG clock
> > > > output.
> > > >
> > > > Signed-off-by: Peng Fan <[email-masked]>
> > >
> > > Does this need a Fixes tag?
> > 
> > Not sure as it's not code logic issue but a hardware bug.
> > And 4.19 LTS still have not this driver support.
> 
> Looks like there is an errata for this issue, and Ranjani just sent a patch for review internally,

Having errata number in both commit log and code comment is generally
helpful.

Shawn

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