From mboxrd@z Thu Jan 1 00:00:00 1970 From: Icenowy Zheng Subject: Re: Re: [RFC PATCH] ARM: dts: sun8i: add simplefb node for H3 Date: Thu, 01 Dec 2016 03:03:14 +0800 Message-ID: <20161130220324.3Kg4VPEw@smtp1m.mail.yandex.net> Reply-To: icenowy-ymACFijhrKM@public.gmane.org Mime-Version: 1.0 Content-Type: text/html; charset=UTF-8 Return-path: Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: Jernej Skrabec Cc: linux-sunxi , linux-kernel , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, jernej.skrabec-gGgVlfcn5nU@public.gmane.org, wens-jdAy2FN1RRM@public.gmane.org, maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org List-Id: devicetree@vger.kernel.org


2016年12月1日 02:49于 Jernej Skrabec <jernej.skrabec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>写道：
>
> Hi Jean-François,
>
> Dne sreda, 30. november 2016 10.35.08 UTC+1 je oseba Jean-François Moine napisala:
>>
>> On Tue, 29 Nov 2016 22:59:32 +0100
>> Maxime Ripard <maxime...-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:
>>
>> > > > I'm still not sure which pipeline should I use.
>> > > >
>> > > > And, it seems that HDMI Slow Clock is not needed?
>> > > >
>> > > > (seems that it's only for EDID, but simplefb won't use EDID)
>> > >
>> > > So, I don't see how this may work.
>> > > How can the u-boot know the resolutions of the HDMI display device?
>> > >
>> > > In other words: I have a new H3 board with the last u-boot and kernel.
>> > > I plug my (rather old or brand new) HDMI display device.
>> > > After powering on the system, I hope to get something on the screen.
>> > > How?
>> >
>> > If it works like the driver for the first display engine in U-Boot, it
>> > will use the preferred mode reported by the EDID, and will fallback to
>> > 1024x768 if it cannot access it.
>>
>> Icenowy wrote: "simplefb won't use EDID"
>>
>> Then, if it is like in the kernel, the 1024x768 mode is VGA. It does
>> not work with HDMI (different timings).
>
>
> U-Boot driver now accept any timings recommended by EDID. So far it
> was tested with at least following resolutions:
> - 1920x1080 @ 60 Hz
> - 1280x1024 @ 60 Hz
> - 1280x800 @ 60 Hz (slight clock difference)
> - 800x480 (not sure about frame rate)
> - 3840x2160 @ 30 Hz (4K)

I tested on 1024x600 (If my memory is right, it's @ 60Hz)

>
> and nobody complained so far. I'm pretty sure 1024x768 would work.
>
>>
>> > Maybe it would be worth exchanging on the EDID code that has been done
>> > for the u-boot driver too, so that it can be fixed in your driver.
>>
>> The u-boot got my code, and, up to now, I could not fix the random or
>> permanent failures of EDID reading in some boards.
>>
>
> I only have one OPi2, but as I said, EDID always worked for me. The only
> code left from you is for DE2. HDMI stuff is basically copied from Rockhip
> driver (including EDID reading), TCON code is now reverted to the same as
> it is in sunxi_display.c. I think it is worth to take a look at EDID code and
> compare it.

So is the TCON of DE 2.0 identical to the original TCON?

If so, we should reuse sun4i-tcon ...

>  
>>
>> --
>> Ken ar c'hentañ        |              ** Breizh ha Linux atav! **
>> Jef                |                http://moinejf.free.fr/
>
>
> Best regards,
> Jernej Škrabec
>
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