lkml.org 
[lkml]   [2016]   [Aug]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] exynos-drm: Fix display manager failing to start without IOMMU problem
From
Date
On 08/10/2016 04:59 PM, Inki Dae wrote:
> Hi Shuah,
>
> 2016년 08월 11일 02:30에 Shuah Khan 이(가) 쓴 글:
>> Fix exynos_drm_gem_create_ioctl() attempts to allocate non-contiguous GEM
>> memory without IOMMU. In this case, there is no point in attempting to
>
> DRM gem can be used for Non-DRM drivers such as GPU, V4L2 based Multimedia device and other DMA devices.
> Even though IOMMU support is disabled, other framework based DMA drivers can use IOMMU - i.e., GPU driver -
> and they can use non-contiguous GEM buffer through UMM. (DMABUF)
>
> So GEM allocation type is not dependent on IOMMU.

Hi Inki,

I am seeing the following failure without IOMMU and light dm fails
to start:

[drm:exynos_drm_framebuffer_init] *ERROR* Non-continguous GEM memory is not supported.

The change I made fixed that problem and light dm starts without IOMMU.
Is there a better way to fix this problem? Currently without IOMMU,
light dm doesn't start.

This is on linux_next

thanks,
-- Shuah

\
 
 \ /
  Last update: 2016-08-11 01:41    [W:0.059 / U:4.764 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site