[haiku-development] Re: Dropping intel_gart (and agp_gart)
- From: "Adrien Destugues" <pulkomandy@xxxxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 03 Nov 2015 16:04:04 +0000
The Intel Linux drivers moved the gart / gtt code into them vs exposing the
gart externally.
How is that simpler? There are two different problems:
1) Mapping the framebuffer so it can be written to (fast, if possible) - done
by the GART
2) Setting up the video mode - done by the intel_extreme driver
If the new devices have a completely new layout, then write a new driver.
If the GART/memory mapping part didn't change, you can reuse the existing GART
driver, otherwise just write your new driver the way you want (at least Haswell
seems to have a different register layout, but use the same GART as previous
generations). It is much easier to reuse that code when it is a separate module.
For devices that did support both AGP and GTT/pci-express, we could use the
same intel_extreme driver and switch the GART implementations.
As far as I can see, they are rather independant from each other and don't
necessarily update together.
--
Adrien.
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