[Letux-kernel] OMAP5 Pyra: DSI Panel problems with 4.12-rc1

Tomi Valkeinen tomi.valkeinen at ti.com
Tue May 23 12:29:15 CEST 2017

On 23/05/17 13:13, H. Nikolaus Schaller wrote:

>> I digged up my omap5 uevm, which has the dsi panel you sent me long time
>> back. After forward porting the related patches, for some reason, I'm
>> getting dispc underflows with it (after I revert the patch above). But I
>> still get a semi-valid picture, and can do page flips at ~60fps.
>> After applying the patch, fps drops into half. I don't see anything
>> wrong with the PLL calcs. I was doing testing with some other dividers,
>> and, well... results vary. Changing the fint_min to 0.5MHz in dsi.c
>> makes it work, but lower limits show different problems. TRM has
>> conflicting limits for the PLL's internal frequencies, so I don't know
>> the correct limits.
>> I'll look at this a bit more when I find time.
> Ok, no problem. Take the time it needs to fix.
> For the moment we can live with the revert-hack.

Looks like the underflow issue is not in DSS as such. Underflows
disappear if I run memtester at the same time, but appear if nothing
much (other than DSS) is using the memory.


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