On Wed, Jul 29, 2015 at 9:38 PM, Russell King - ARM Linux
[off-list ref] wrote:

On Wed, Jul 29, 2015 at 02:27:11PM +0200, Linus Walleij wrote:

quoted

Commit 11c32d7b6274cb0f554943d65bd4a126c4a86dcd
"video: move Versatile CLCD helpers" already moved the
CLCD mode setting helpers for Versatile and Integrator/CP
to drivers/video/fbdev. Let's do the same for the IM-PD1
add-on board, copy the missing displays into the database
and simplify the code.

And thereby break the support.  The IM-PD1 CLCD can only access the memory
on the IM-PD1.  That's why the CLCD driver itself doesn't just allocate
the frame buffer using dma_alloc_writecombine().  Where the memory comes
from is platform specific.  In this case...

quoted

-static int impd1fb_clcd_setup(struct clcd_fb *fb)
-{
-     unsigned long framebase = fb->dev->res.start + 0x01000000;
-     unsigned long framesize = SZ_1M;

It's a chunk of SRAM offset by the specified value and of the specified
size above.

Argh how typical. I need to get one of these PROSPECTOR displays
so I can actually test this stuff. I have tried to get VGA out working with
the IM-PD1 but it just doesn't seem to come up no matter how I
try.

Yours,
Linus Walleij