Re: [PATCH 0/1] ARM: dts: sunxi: Fix simplefb not working in 4.7-rc1

[Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>]

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On Mon, Jun 13, 2016 at 10:30:57AM +0200, Hans de Goede wrote:
> Hi,
> 
> On 13-06-16 10:01, Maxime Ripard wrote:
> >On Thu, Jun 09, 2016 at 12:47:36PM +0200, Hans de Goede wrote:
> >>Hi,
> >>
> >>On 09-06-16 09:46, Maxime Ripard wrote:
> >>>Hi Hans,
> >>>
> >>>On Sat, Jun 04, 2016 at 08:05:23PM +0200, Hans de Goede wrote:
> >>>>Hi Maxime,
> >>>>
> >>>>While testing 4.7-rc1 / linux-sunxi/sunxi-next on a A10s I noticed that
> >>>>hdmi out is no longer working (screen goes black when the kernel turns
> >>>>of unused clocks).
> >>>>
> >>>>This is caused by the dtsi for sun4i / sun5i / sun7i based boards now
> >>>>listing pll3, without pll3 being added to the clocks list for the
> >>>>simplefb nodes.
> >>>
> >>>Why not do just that then? It's more appropriate for a fix imho.
> >>
> >>You mean just for sun5i-a10s, or for all of sun4i / sun5i-a10s and
> >>sun7i ?
> >>
> >>For sun4i and sun7i things are already fixed in next:
> >>
> >>https://git.kernel.org/cgit/linux/kernel/git/mripard/linux.git/commit/?id=5a7f2310cc847a73852e70bc720a61ca9bf986a6
> >>https://git.kernel.org/cgit/linux/kernel/git/mripard/linux.git/commit/?id=c79255ca4d7b67cce4eac4dd532e097ce49f3679
> >>
> >>It seems best to use those fixes, rather then come up with a separate
> >>fix for 4.7.
> >>
> >>My patch for fixing sun5i-a10s is inline with the 2 above patches,
> >>which seems best, rather then doing something special for just sun5i-a10s.
> >
> >Well, you are doing something special for just the A10s: the patches
> >quoted above just add a bunch of clocks and add the handles to the
> >list of clocks managed by simplefb.
> >
> >For the A10s, you also declare the whole display engine block without
> >anyone having tested that it was actually working.
> 
> A10s is the same SoC as A13 / R8, just in a different package / with
> different pins routed to the outside and it features a parallel LCD
> interface just like the A13 / R8. We've had this confirmed by
> Allwinner multiple times now, A13 / A10s / R8 literary are the same
> chip, there simply is no way the displayblock on the A10s somehow
> is magically different.
> 
> Given all this, clearly having this identical displayblock in the
> shared sun5i.dtsi is the right thing to do.

Maybe, but this is not a patch for an 4.7-rc* release, but for the
next merge window.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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