Re: [PATCH] drm/sun4i: init dclk_min_div & dclk_max_div inside encoder init functions

[Giulio Benetti]

Hi,

Il 28/02/2018 16:55, Maxime Ripard ha scritto:
> Hi,
>
> On Wed, Feb 28, 2018 at 01:51:58PM +0100, Giulio Benetti wrote:
> > sun4i_dclk_round_rate is called before sun4i_tcon_mode_set,
> > so it finds dclk_min_div and dclk_max_div set to 0 and fails
> > adding crtc.
> >
> > Move dclk_min_div and dclk_max_div to encoders init functions.
> >
> > Signed-off-by: Giulio Benetti <giulio.benetti@xxxxxxxxxxxxxxxx>
>
> I sent a similar patch there:
> https://lists.freedesktop.org/archives/dri-devel/2018-February/166666.html

I've missed that.
And where you put it is better, since it's called every time set_mode is 
called.

On lvds instead I don't see anything about this,
it should have the same potential problem.
Also I can't understand why it has been set min=7 and max=7 on lvds.
With those values I would obtain 77Mhz only.
And I can't find values on datasheet for minimum and maximum.

> I guess eventually, we'll want to remove the usage of the clock
> framework entirely, but it's not really the scope of a fix.

Where would you handle dclk instead of tcon?

Thanks

--
Giulio Benetti
CTO

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> Maxime