28.04.2021 08:57, Mikko Perttunen пишет:
> On 4/28/21 8:51 AM, Dmitry Osipenko wrote:
>> 23.04.2021 19:32, Thierry Reding пишет:
>>> Note that there will be no new releases of the bootloader for earlier
>>> devices, so adding support for these new DT bindings will not be
>>> practical. The bootloaders on those devices do pass information about
>>> the active framebuffer via the kernel command-line, so we may want to
>>> add code to create reserved regions in the IOMMU based on that.
>>
>> Since this change requires a bootloader update anyways, why it's not
>> possible to fix the bootloader properly, making it to stop all the DMA
>> activity before jumping into kernel?
>>
> 
> That is not desirable, as then we couldn't have seamless
> bootloader-kernel boot splash transition.

The seamless transition should be more complicated since it should
require to read out the hardware state in order to convert it into DRM
state + display panel needs to stay ON. It's a bit questionable whether
this is really needed, so far this is not achievable in mainline.

Nevertheless, it will be good to have an early simple-framebuffer, which
I realized only after sending out the message.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

Reply via email to