Re: [PATCH v5 00/10] OMAP4 : DSS2 : HDMI support on OMAP4

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Hi Tomi,Sebastien,

On Tue, Mar 15, 2011 at 9:36 AM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote:
> On Mon, 2011-03-14 at 05:37 -0500, Jan, Sebastien wrote:
>> Hi Tomi,
>>
>> On Thu, Mar 10, 2011 at 2:44 PM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote:
>> > I think this version is good. It works for me, at least =).
>> >
>> > Any Panda or Blaze owners reading this want to give this a try?
>>
>> Tested on my pandaboard, with these patches applied on top of your
>> dss2 tree: I get a working display on my DVI or my HDMI screen. => I
>> tested by running the Ubuntu UI.
>>
>> I have a couple of these traces from times to times (seems linked to
>> screen saver enabling/disabling the screen):
>> omapdss DISPC error: timeout waiting for EVSYNC
>
> Yes, I get those every time I enable or disable the HDMI output. That
> shouldn't cause any problems, but it's something that needs to be fixed
> at some point.
>
>> The best screen resolution is properly selected on both of my screens,
>> but the frame-buffer is sized to 640x480. So the display works but the
>> usable surface when going though /dev/fb0 is quite reduced.
>> Is there a way to get the FB sized according to the screen resolution
>> (in the init sequence, it appears that the FBs are allocated before
>> the init of the HDMI)?
>
> Currently the resolution has to be configured by the user manually. I
> haven't tried, but I think giving the resolution with boot parameters
> should also work. Mythri, have you tried that?
>
You could configure the timings later on with the sysfs ( set_timings ) or
HDMI driver would pick the best timing (as suggested by standard) , but
yes framebuffer would have picked the timing on probe so it will not update.

> I don't think it is possible for the omapdss, panel or omapfb drivers to
> configure the resolution automatically, except at boot time. After we
> have booted up, there may be users for the framebuffer and changing it
> "secretly" would cause problems.
>
> I think the best way here is that the HDMI/omapdss driver gives hotplug
> event, which is conveyed through omapfb to an userspace application.
> This application can then query the available resolutions via some
> mechanism, and select one of those.
>
>> Fyi, I have also tested with the patches for DVI support and can get
>> both outputs working simultaneously (my tree is here:
>> http://dev.omapzoom.org/?p=sebjan/kernel.git;a=shortlog;h=refs/tags/topic-display-iv1-2.6.38-rc7).
>
> Thanks. I'll also set up a "test" branch in DSS2 tree shortly, to which
> I'll add DVI and HDMI patches for easier testing.
>
>  Tomi
>

Thanks and regards,
Mythri.
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