On Mon, Nov 27, 2017 at 9:34 AM, Jonathan Neuschäfer <[email protected]> wrote: > Hi, > > On Mon, Nov 27, 2017 at 11:44:57AM +0000, [email protected] > wrote: >> From: Srinivas Kandagatla <[email protected]> >> >> MSM IOMMU is required for apq8064 display, so enable it by default. > > What exactly do you mean by "display"? Which ip block requires IOMMU > support? >
display block in apq8064 is mdp4 (drivers/gpu/drm/msm/mdp/mdp4).. technically it can use iommu in bypass mode w/ physically contiguous memory, but no one wants to do that, if they don't have to. The gpu does have a hard requirement on iommu. BR, -R
