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From: Andrey Smirnov <andrew.smirnov@gmail.com>
Date: Mon, 27 May 2019 00:25:35 -0700
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Subject: Re: [PATCH v2 1/5] clk: imx6: remove quirky
 clk_set_parent(LDB_diN_sel, pll5_video_div)
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: Barebox List <barebox@lists.infradead.org>, Raphael Poggi <poggi.raph@gmail.com>, pza@pengutronix.de

On Sun, May 26, 2019 at 11:50 PM Andrey Smirnov
<andrew.smirnov@gmail.com> wrote:
>
> On Sun, May 26, 2019 at 11:29 PM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
> >
> > Hello Andrey,
> >
> > On 26/5/19 23:55, Andrey Smirnov wrote:
> > > On Tue, May 21, 2019 at 8:56 AM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
> > >>
> > > This particular patch does break a non 6Q+ version of RDU2,  but the
> > > follow up ones in the series fix it, so it seems that no action is
> > > really necessary on my part.
> >
> > The reparenting removed in this patch isn't reinstated by the rest of the series.
> > They merely apply parentage expressed in the device tree in a glitch-free manner.
> >
> > As both barebox and kernel imx6qdl-zii-rdu2.dtsi lack the relevant
> > assigned-clock-parents snippet, I am not sure what it is this patch broke that the
> > follow-up ones fixed?
>
> Not sure, will investigate.
>

Ah, I see, so with re-parenting to PLL5 removed ldb_* clocks default
to MMDC_CH1 and for that to work "clk: imx6: Mask mmdc_ch1 handshake
for periph2_sel and mmdc_ch1_axi_podf" is needed. After that commit
MMDC_CH1 seems to work well enough for frame buffer to come up and
function.

Thanks,
Andrey Smirnov

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