[U-Boot] [linux-sunxi] [u-boot 2/2] sun5i: bump DEBE priority (useful on a10s only)

Michal Suchanek
2015-01-19T09:06:01Z

On 19 January 2015 at 05:29, Siarhei Siamashka
<siarhei.siamashka@gmail.com> wrote:
> On Sun, 04 Jan 2015 20:49:38 +0100
> Hans de Goede <hdegoede@redhat.com> wrote:
>
>> Hi,
>>
>> On 04-01-15 20:19, Michal Suchanek wrote:
>> > Setting magic 'reserved' hpcr bit on sun5i DEBE seems required for
>> > smooth HDMI scanout of large frambuffer (eg. 1080p).
>> >
>> > This fix comes at the cost of some overall memory bandwidth so it
>> > might be appropriate to detect a10s and only apply there (and not a13).
>>
>> Hmm, Sairhei is the expert on this, adding him to the Cc. Sairhei, what
>> do you think of the proposed change ?
>
> I don't have A10s hardware, so have no idea and can't test anything
> myself.
>
> It would be great to have a better description of what exactly is
> happening before the patch. And precisely how the patch is helping.
> A description of the test setup and benchmark numbers would be
> appreciated. And it would be perfect if somebody else could reproduce
> the test and confirm the results.

The result is that with full HD HDMI output lima-memtester cube jumps
without the patch and does not jump with the patch. I have only 1 A10s
board.

Thanks

Michal