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omapfb: Fix 12-bit display (RGB444 color mode) handling 

Support for RGB444 (12-bit) pixel format has been introduced into omapfb/lcdc
by Mark Underwood on 2006-05-26 (commit
f74edb6668aad9fc8e81585861b18f996c78a574) in preparation for Amstrad Delta
(E3) videophone LCD display support.

Before the Amstrad Delta LCD patch by Jonathan McDowell was applied (on
2006-08-04, commit 8d22fb2ea004cdb6379b54c1a8fd1546cfe40ed7), omapfb and lcdc
code was changed substantially (commit
e563dc81aa01bd8bbb01bc53975a15c398715f62 dated 2006-06-26) in a way that broke
Mark's 12-bit display support. Than, a patch by Jonathan, that supposed to
correct the problem, was introduced immediatelly (on 2006-08-04, commit
e10a75b49e7a57ae17c28b705153c70eba15a8ef).

As a result, the Amstrad Delta display was working correctly at boot time,
with fbset reporting:

	geometry 480 320 480 320 16
	...
	rgba 4/8,4/4,4/0,0/0

However, after first framebuffer reinitialization, colors were no longer being
displayed correctly and fbset was reporting:

        rgba 5/11,6/5,5/0,0/0

The patch tries to correct the issue by setting plane->color_mode depending on
panel->bpp, not var->bits_per_pixel.

Created and tested on Amstrad Delta against linux-2.6.33-rc3.

Signed-off-by: Janusz Krzysztofik <jkrzysz@tis.icnet.pl>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
This commit is contained in:
Janusz Krzysztofik 2010-01-14 21:25:43 +01:00 committed by Tomi Valkeinen
parent 60596045ac
commit 3e9ff04408
1 changed files with 4 additions and 3 deletions
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7
drivers/video/omap/omapfb_main.c
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@ -486,10 +486,11 @@ static int set_color_mode(struct omapfb_plane_struct *plane,
return 0;
case 12:
var->bits_per_pixel = 16;
plane->color_mode = OMAPFB_COLOR_RGB444;
return 0;
case 16:
plane->color_mode = OMAPFB_COLOR_RGB565;
if (plane->fbdev->panel->bpp == 12)
plane->color_mode = OMAPFB_COLOR_RGB444;
else
plane->color_mode = OMAPFB_COLOR_RGB565;
return 0;
default:
return -EINVAL;