Re: [PATCH 0/2] Add recommended bpp for omap dss2 generic dpi

[Daniel Morsing <daniel.morsing@gmail.com>]

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On Wed, 2011-02-16 at 16:36 +0200, Tomi Valkeinen wrote:
> On Wed, 2011-02-16 at 08:06 -0600, Daniel Morsing wrote:
> > Hi Tomi
> > 
> > On Wed, 2011-02-16 at 15:11 +0200, Tomi Valkeinen wrote:
> > > Hi,
> > > 
> > > On Sat, 2011-02-12 at 11:02 -0600, Daniel Morsing wrote:
> > > > The panel added is the 4.3 inch display that is sold with the
> > > > Devkit8000.
> > > 
> > > Hmm. Devkit8000's panel is connected with 24 datalines, according to the
> > > board file. Why do you want to use 16 bpp format for that?
> > > 
> > >  Tomi
> > > 
> > 
> > Running the panel at 24 bpp or specifying 16 datalines causes color
> > distortion.
> > 
> > The only way I've been able to run the panel without color distortion,
> > is with 24 datalines and 16 bpp.
> > 
> > I'm not well versed in displays, so I might be making a mistake
> > somewhere. The BSP for the devkit8000 doesn't include a datasheet for
> > the panel, so I can't look into what's causing this weirdness.
> 
> I don't think I'll add a feature which doesn't make sense, to fix a
> problem we don't understand =).
> 
> A datasheet I found mentions
> 
> "One 4.3” TFT LCD (With Touch panel, CHI HSIN LR043JC211 LCD
> Model)"
> 
> And I found:
> 
> http://www.timll.com/chinese/download/files/CHILIN_TECHNOLOGY.pdf
> 
> It looks like 24bpp display.
> 

Ok I looked through the datasheet and it looks to me that i got
the .config field right. Only thing that's vague from that sheet is
which pixel clock edge the v-sync and h-sync are driven low and the
color distortion is still there with either option.

> What kind of color distortion do you see? Perhaps the problem is
> somewhere else, like wrong horizontal sync, vertical sync or pixel clock
> signal setting in .config field. This info should be in the panel
> datasheet, but it usually takes some deciphering to understand it =).
> 
>  Tomi
> 

I'm seeing a light cyan tint to everything when running at 24bpp. Using
16 datalines causes a heavy blue tint.

Regards,
Daniel Morsing




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