[Letux-kernel] TILER patches for Pyra

[H. Nikolaus Schaller]

> Am 08.12.2018 um 23:07 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> Hi all,
> 
>> Am 08.12.2018 um 15:57 schrieb aTc <atc at k-n-p.org>:
>> 
>> On 12/8/18 1:33 PM, H. Nikolaus Schaller wrote:
>>> Hi,
>>> I have seen that ED has announced that there is a new set of TILER patches:
>>> 	https://pyra-handheld.com/boards/threads/wrapping-everything-up.83465/
>>> "zmatt has reimplemented his rotation hack (so the Pyra is finally fully usable again!)"
>>> Is this reimplementaion available anywhere for integration into the letux tree?
>> 
>> https://github.com/mvduin/linux/commits/letux-4.19.3/hack
> 
>> 
>> I applied it to the 4.19.4 kernel, 4.19.3 is very unstable.
>> 
>> It's a quick hack though, not the cleaned up version zmatt mentioned here before.
> 
> I have looked through them and they work if applied.
> But one patch breaks on other platforms (omap3).
> 
> I remember that we had already discussed that and I found that
> 
> http://git.goldelico.com/?p=letux-kernel.git;a=commit;h=4f7cefb1416dca96d2a48d5cf884b01c010d4992
> 
> tries to fix it. But makes it a platform dependent compile.
> 
> So we had discussed that a while ago, worked on a solution and
> then forgot about it because it worked with X11 on all platforms.
> 
> Therefore I'd suggest a better fix is to detect OMAP5 in
> 
> drivers/video/fbdev/core/fbmem.c
> 
> and make the #if dynamic.
> 
> I remember there was some API to check for the exact platform.
> Something where patterns could be provided and it was used
> to decide between AM/DM37xx and AM33xx. Maybe in the PVR/SGX
> driver stuff?
> 
> So something like
> 
> if (platform_is("OMAP543[02]"))
> 	vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
> else  // all others incl. OMAP3 w/o TILER
>        fb_pgprotect(file, vma, start);
> 
> could be the better hack...
> 
> Does anyone remember how this "platform_is" function is called?

I think I found it: soc_device_match()

https://elixir.bootlin.com/linux/v4.20-rc5/source/drivers/gpu/drm/omapdrm/dss/dpi.c#L703

> 
> BR,
> Nikolaus
> 
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