Re: Splash screen on mx35 3 stack

['Sascha Hauer' <s.hauer@pengutronix.de>]

On Mon, Apr 05, 2010 at 02:55:33PM +1000, Marc Reilly wrote:
> Hi Sascha,
> 
> Please pardon my terrible manners for not saying a big "thank you" sooner!
> Easter holiday preparations got in the way.

No problem, I was in easter mdoe aswell ;)

> 
> > I have short circuited pins 2 and 3 of q6 on the personality board to get
> power
> > to the LCD. q6 is normally driven by the mc9s08 (pin ptf0). We did not
> have
> > any code for this chip at that time and then forgot about it. As we now
> have a
> > driver for it it should only be a matter of finding the right bits to
> twiddle with.
> 
> Ah, I see ... so this LCD only works if power is supplied to it? :)
> 
> As a quick test I shorted out pin 2 and 3 of Q6, and the LCD works.
> However, I can't that FET to turn on via software. I've tried enabling the
> LCD in f3s_enable_display with:
> 
> u8 mask = (0x01 << 6);
> mc9sdz60_set_bits( mc9sdz60_get(), MC9SDZ60_REG_GPIO_1, mask ,  mask);
> 
> From a quick glance, this seemed to be essentially what the kernel was
> doing. Mc9sdz60 registers read as expected but the screen stays off - that's
> as much as I had time for.
> 
> > Patches welcome ;)
> If I figure it out, will submit a patch for sure, but I'll be moving to
> custom hardware soon and it will become irrelevant, so I may have to admit
> defeat.

Same situation here, so I added the following patch to make this clear:


From 86d1c12dd33b538dd2b3fc750d869e9defa2cd6e Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Tue, 6 Apr 2010 08:28:00 +0200
Subject: [PATCH] i.MX35 3stack: Add a comment about the nonworking display

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 board/freescale-mx35-3-stack/3stack.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/board/freescale-mx35-3-stack/3stack.c b/board/freescale-mx35-3-stack/3stack.c
index 3b6a93b..1faf1b9 100644
--- a/board/freescale-mx35-3-stack/3stack.c
+++ b/board/freescale-mx35-3-stack/3stack.c
@@ -113,6 +113,10 @@ static struct device_d i2c_dev = {
 
 /*
  * Generic display, shipped with the PDK
+ * FIXME: The power for the display is driven by the mc9s08. This is
+ * currently not done in software, for the display to work you have to
+ * short ciruit pins 2 and 3 of q6 on the personality board, or better,
+ * send a patch.
  */
 static struct fb_videomode CTP_CLAA070LC0ACW = {
 	/* 800x480 @ 60 Hz */
-- 
1.7.0


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