[PATCH 04/14] gpu: ipu-v3: ipu-dmfc: Use static DMFC FIFO allocation mechanism

[Ying Liu]

On Tue, May 24, 2016 at 10:23 PM, Philipp Zabel <p.zabel at pengutronix.de> wrote:
> Am Dienstag, den 24.05.2016, 18:10 +0800 schrieb Liu Ying:
>> For normal video modes such as 1280x720p at 60Hz and 1920x1080p at 60Hz,
>
> I'm very happy to drop all this code if possible, but the stated reason
> is not good enough. Rather we should look at the worst case and make
> sure that 2 FIFO slots are enough for 180 MPixel/s on i.MX5 and enough
> for 240 MPixel/s on i.MX6.

My stated reason is not accurate, perhaps.  Sorry.
IIRC, when I wrote this patch, I found we use 2 slots for all
video modes with the dynamic allocation mechanism.
That's why the static one comes up to mind.

> According to the current heuristic (total bandwidth = clkrate * 4 pixels
> with 8 slots) that should be true.

I'm not sure what's the best allocation algorithm is.
Hope that the static one can be accepted temporarily and some one
may offer a better solution in future.

Regards,
Liu Ying

>
> regards
> Philipp
>