On 09/22/2012 06:35 AM, Otavio Salvador wrote:
On Fri, Sep 21, 2012 at 2:44 PM, Eric Nelson
<eric.nel...@boundarydevices.com> wrote:
On 09/21/2012 10:22 AM, Anatolij Gustschin wrote:
Hi Eric,
On Fri, 21 Sep 2012 09:38:23 -0700
Eric Nelson<eric.nel...@boundarydevices.com> wrote:
Hi all,
While looking into some trouble booting the latest Linux kernel patches
for i.MX6 display support, I found that the kernel driver was thrown off
by
the interrupt status bits in the i.MX6 IPU.
Until and unless we have the ability to hand off a 'live' display, it
seems
that we should disable the video driver as a part of the 'bootm' process.
At the very least, doing this will avoid the possibility of trash on the
display during the transition.
I've been looking, and I don't see a place to tap into this process.
It seems that having a shutdown routine for the display drivers
(cfb_console?) is the way to go.
cfb_console driver is a renderer of the characters and bitmaps
to the framebuffer memory and is not a good place for a shutdown
routine, I think. But we can add a shutdown function to the IPU
driver drivers/video/mxc_ipuv3_fb.c and call it before booting.
bootm code in common/cmd_bootm.c has a weak arch_preboot_os()
function that can be overridden by platform specific preboot
routine. We could define a preboot function in
arch/arm/cpu/armv7/mx6/soc.c
or in
arch/arm/cpu/armv7/imx-common/cpu.c
and call IPU shutdown routine in it.
Thanks Anatolij.
This is just what we need. I'll send a patch shortly.
It would be nice to try to add support for mx5 too so we fix same boot
hungs in mx5 kernels. I am adding Fabio in CC as he knows more about
it.
Hi Otavio,
I believe it will work on MX5 boards as well, though I haven't tested.
http://patchwork.ozlabs.org/patch/185928/
Regards,
Eric
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