On 23.09.2012 17:56, Stefano Babic wrote:
On 22/09/2012 16:37, Fabio Estevam wrote:
On Sat, Sep 22, 2012 at 10:42 AM, Otavio Salvador
<ota...@ossystems.com.br> wrote:
Hello Eric,
On Fri, Sep 21, 2012 at 5:36 PM, Eric Nelson
<eric.nel...@boundarydevices.com> wrote:
Signed-off-by: Eric Nelson<eric.nel...@boundarydevices.com>
Did you test it in mx5 too? We seem to need to handle it in mx5 too as
we had hungs in FSL kernel when using framebuffer in U-Boot. We're
using a patch in kernel for workaround it but it seems your fix does
what is need.
I have just tested Eric's series on a mx53loco and it does fix the
kernel hang issue.
I made some comments on this series and hopefully Eric's v2 can get
into 2012.10, since this is a bug fix.
Ok, I am waiting for V2 and I will push it.
Anyway, a question about the issue. It seems to me that it is not
possible with IPUV3 (I have not tested myself, so my question) to get
the u-boot splashscreen displayed on the LCD until the kernel has
finished to boot. This could be possible (and it is possible on other
SOC) if the IPU is loaded as module instead of statically linked to the
kernel, and if the kernel does not touch the IPU setup. This means also
that it should not disable the clocks used by U-Boot for the IPU.
But I understand from your patch that this way is not possible on
iMX53/MX6, and IPU must be always disabled. Is this correct ?
I'm no expert on this, so I might be wrong and people will correct me:
No, not always. It's my understanding that at the *moment* we have to
disable the IPU in U-Boot before jumping into the kernel due to a bug
in Sascha's kernel IPU driver:
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-September/121980.html
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-September/122100.html
So from my understanding, this isn't a SOC limitation. But we have to
do it as long as the kernel's IPU driver isn't fixed.
Sorry if this is wrong ;)
Best regards
Dirk
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