[PATCH 4/6] staging: drm/imx: Add i.MX IPUv3 crtc support

Eric Nelson eric.nelson at boundarydevices.com
Sat Sep 22 13:52:12 EDT 2012

On 09/22/2012 03:17 AM, Sascha Hauer wrote:
> Hi Eric,
> On Fri, Sep 21, 2012 at 09:24:19AM -0700, Eric Nelson wrote:
>> Hi Sascha,
>> But ipu_crtc->imx_crtc gets initialized in this call, and
>> ipu_irq_handler() makes use of it.
>> The U-Boot code doesn't enable interrupts, so it's not acking
>> along the way, and leaves bits set in IPU1_INT_STAT_15.
>> I found that I can get around this in U-Boot by disabling the
>> LCD controller and acking all of the interrupts after disabling
>> the controller, but I haven't yet figured out where to tap into
>> cleanup_before_linux().
> Passing over an enabled IPU from the bootloader to the kernel is
> (currently) not a supported usecase, so U-Boot should indeed disable it.
> That said, the kernel driver should make sure the IPU is sufficiently
> configured before the interrupts are enabled, so this seems to be a bug
> that deserves fixing.

Thanks Sascha,

Patches for U-Boot are in process.



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