Thread (15 messages) 15 messages, 4 authors, 2011-02-18

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

From: Daniel Morsing <hidden>
Date: 2011-02-16 15:42:38
Also in: linux-omap

On Wed, 2011-02-16 at 16:36 +0200, Tomi Valkeinen wrote:
On Wed, 2011-02-16 at 08:06 -0600, Daniel Morsing wrote:
quoted
Hi Tomi

On Wed, 2011-02-16 at 15:11 +0200, Tomi Valkeinen wrote:
quoted
Hi,

On Sat, 2011-02-12 at 11:02 -0600, Daniel Morsing wrote:
quoted
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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