[PATCH RFC] i.MX51 Framebuffer support

On Wed, Dec 15, 2010 at 09:35:42AM +0000, Peter Horton wrote:

On 09/12/2010 13:47, Sascha Hauer wrote:

quoted

The following series adds i.MX51 framebuffer support based on the IPUv3. It
is not perfect but I decided it is good enough to open it for a wider audience
and collect first reviews. I tested this on a babbage board using both outputs
(VGA/DVI) with different resolutions up to 1680x1050 and different colour depths.
I also tested it on one custom board using a fixed display setting.

Good stuff, almost works here :)

Custom board with an HDMI bridge hooked to DI0.

About 50% of power ups fail to show a display because the DE signal is  
bogus. It appears to be correct for the active window but remains active  
for the vertical blanking period. If the DE signal is correct we get a  
good display. I've tried investigating but the IPU section of the manual  
is unfathomable (and that's just the section on the waveform generator).

I just learned a new word. 'unfathomable' really is the right word for
this ;)
I think it's nearly impossible to write a driver based only on the
datasheet.

Resizing the display to a larger size sometimes shows a square of solid  
colour on the display, hardware cursor perhaps ?

I don't know, but I can't imagine the hardware cursor gets activated
accidently.

Every now and then changing the video mode causes the kernel to hang  
hard. Unfortunately this is not very reproduceable.

I'll try to reproduce it here.

Sascha

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