Messages in this thread | | | From | Rob Clark <> | Date | Mon, 27 Nov 2017 09:48:43 -0500 | Subject | Re: [PATCH 2/3] ARM: qcom_defconfig: enable MSM IOMMU for display |
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On Mon, Nov 27, 2017 at 9:34 AM, Jonathan Neuschäfer <j.neuschaefer@gmx.net> wrote: > Hi, > > On Mon, Nov 27, 2017 at 11:44:57AM +0000, srinivas.kandagatla@linaro.org wrote: >> From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> >> >> 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
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