Re: [Linux-fbdev-users] PXA frame buffer not enabled in 1 bit per pixel mode.

[Antonino A. D. <ad...@gm...>]

James Steward wrote:
> Hi All,
> 
> Please note that I am now a suscribed member so if a previous email of
> the same subject does make it through the moderator, ignore it.
> 
> I have a question regarding the PXA framebuffer support.  I've emailed
> the ARM linux list but to no avail.  We've configured uboot to talk to
> the LCD connected to our board and the LCD works fine.
> 
> Setting up the pxafb for the kernel is proving somewhat more testing.
> Kernel is 2.6.15.1 with no patches to the video drivers.
> 
> My current modprobe looks like this;
> modprobe pxafb \
> options=mode:320x240-1,mono,single,vsynclen:3,hsynclen:1,left:1, \
> right:1,upper:1,lower:1,vsync:1,hsync:1,pixclockpol:0,4pix, \
> pixclock:643023
> 
> This gives the same LCCRX register setup as uboot was configured for,
> with just 2 differences.
> LCCR0_PDD=1 in uboot, =0 from pxafb.
> LCCR0_QDM=0 in uboot, =1 from pxafb.
> 
> I forced LCCR0_PDD on but with no effect.
> 
> I turned on some debugging and got the following;
> pxa2xx-fb pxa2xx-fb: overriding resolution: 320x240
> pxa2xx-fb pxa2xx-fb: overriding bit depth: 1
> pxa2xx-fb pxa2xx-fb: override vsynclen: 3
> pxa2xx-fb pxa2xx-fb: override hsynclen: 1
> pxa2xx-fb pxa2xx-fb: override left: 1
> pxa2xx-fb pxa2xx-fb: override right: 1
> pxa2xx-fb pxa2xx-fb: override upper: 1
> pxa2xx-fb pxa2xx-fb: override lower: 1
> pxa2xx-fb pxa2xx-fb: override vsync: Active High
> pxa2xx-fb pxa2xx-fb: override hsync: Active High
> pxa2xx-fb pxa2xx-fb: override pixel clock polarity: falling edge
> pxa2xx-fb pxa2xx-fb: override pixclock: 643023
> pxa2xx-fb pxa2xx-fb: Upper and lower margins must be 0 in passive mode
> 
> *** Why is this so?  It worked with uboot with these settings!***

These are just over-verbose messages...

> 
> pxafb: palette_mem_size = 0x00000020
> pxafb: set_par
> pxafb: palette_mem_size = 0x00000008
> pxafb: true_color = 0
> pxafb: Configuring PXA LCD
> var: xres=320 hslen=1 lm=1 rm=1
> var: yres=240 vslen=3 um=1 bm=1
> var: pixclock=643023 pcd=32
> nlccr0 = 0x0030187a
> nlccr1 = 0x0000013f
> nlccr2 = 0x010108ef
> nlccr3 = 0x00400020
> pxafb: Enabling LCD controller
> fdadr0 0xa7fd4fe8
> fdadr1 0xa7fd4fc8
> reg_lccr0 0x0030187a
> reg_lccr1 0x0000013f
> reg_lccr2 0x010108ef
> reg_lccr3 0x00400020
> FDADR0 0xa7fd4fe0
> FDADR1 0xa7fd4fc0
> LCCR0 0x0030187b
> LCCR1 0x0000013f
> LCCR2 0x010108ef
> LCCR3 0x00400020
> pxafb: LCD power on
> pxafb: backlight on
> 
> However when I run pxaregs LCCR0 I find that the LCCR0_ENB is not set -
> but the debug shows it was set by the driver.
> 
> So who's disabling the FB?

Try unconditinally calling pxafb_schedule_work() in pxafb_activate_var().
Then reread the register.

Tony