Re: LCD on Zoom2 dev board with DSS

[Yanick Saugy <yanick.saugy@heig-vd.ch>]

Hi,

I solved my problem. It appeared the PIN which controls LCD's reset
signal (VGA_nRESET/h_GPIO_96) was not configured as a GPIO, and the
driver tries to use it as GPIO, so the logical value was 0. We had to
modify the OMAP MUX, and select this PIN (CAM_XCLKA) as an output GPIO
(OMAP_MUX_MODE4).

Be aware of changing this PIN will probably disable the camera, because
it was previously configured as a clock.

There is the patch for the LCD (diff -Naur):

--- a/arch/arm/mach-omap2/board-zoom2.c	2010-09-15 15:27:05.148399721
+0200
+++ b/arch/arm/mach-omap2/board-zoom2.c	2010-09-15 14:46:09.792900019
+0200
@@ -71,6 +71,7 @@
 
 #ifdef CONFIG_OMAP_MUX
 static struct omap_board_mux board_mux[] __initdata = {
+	OMAP3_MUX(CAM_XCLKA, OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
 	{ .reg_offset = OMAP_MUX_TERMINATOR },
 };
 #else



Le lundi 13 septembre 2010 à 14:43 +0200, Yanick Saugy a écrit :
> Hi all, 
> 
> I'm working on a zoom2 dev board (omap34x-II MDP). There is my actual config :
> 
> I've built kernel 2.6.35 from git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6.git
> and then applied the following patchs :
> [PATCH 1/2 V7] OMAP: ZOOM2/3&SDP3630: Add display board file for zoom boards <http://marc.info/?l=linux-omap&m=127445506720934&w=2>
> [PATCH 2/2 V7] OMAP: ZOOM2/3&SDP3630: Add display board file for zoom boards <http://marc.info/?l=linux-omap&m=127445522921326&w=2>
> [PATCH V6] OMAP: DSS: Add NEC NL8048HL11-01B display panel <http://marc.info/?l=linux-omap&m=127445535621669&w=2>
> 
> Finally I've enabled DSS and lcd NEC_NL8048HL11 in kernel config file.
> 
> At this time the kernel boots well, and my LCD backlight turns on but I can't see TUX while booting, and I can't draw anything after logging in.
> I've checked, the framebuffer device is present and configured with size of 800x480.
> 
> I've played with sys filesystem like on this wiki, but nothing happened:
> <http://www.omappedia.org/wiki/Bootargs_for_enabling_display>
> 
> To enable DSS at boot time, I passed following boot options:
> vram=10M omapdss.def_disp=lcd
> 
> 
> Perhaps I've missed something?
> 
> Thank you in advance.
> 
> ---
> Yanick
> 
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