On 13 May 2015 at 18:16, Michal Suchanek <[email protected]> wrote: Hi Michal, Thank you very much for your reply. It does make much sense:-) I fix the "DMA: Out of SW-IOMMU space" issue by adding a "dma-coherent;" property to both display drm and gpu driver dts node.
There are two dma_map_ops implementations of swiotlb for arm64, that are: noncoherent_swiotlb_dma_ops and coherent_swiotlb_dma_ops. By default,device driver use the noncoherent one. In our case, the buffers, which allocated in display drm driver, are coherent. So we need to add a "dma-coherent;" property to both display drm and gpu driver dts node to make sure our drm and gpu driver use the coherent one. Now i can run OpenGL ES application now, such as es2gears. On 12 May 2015 at 15:03, Guillaume Tucker <[email protected]> wrote: > >> Then i run startx, i can see the desktop on the monitor. > >> But i found that the X process doesn't load any EGL and GLES libs by > >> seeing the info of /proc/X process ID/task/*/smaps file. > > > > Most X11 desktop environments use OpenGL, not OpenGL ES. Then like most > > embedded GPUs, Mali-450 only supports OpenGL ES so the X11 desktop is > > not hardware-accelerated. > > This is somewhat unrelated to the issue of the armsoc driver being a > bug pile that makes your system crash. > > However, both GNOME and KDE can use OpenGL ES for desktop acceleration. > > Do you know if Debian desktop can use OpenGL ES for acceleration? And how? Other desktops use Render or whatever acceleration which is actually > faster for small scale effects when done in software but can be a bit > sluggish for large window moves/resizes on slow CPUs. > > > > >> [ 23.793] (II) GLX: no usable GL providers found for screen 0 > > > > This means that although X11 found a valid armsoc driver and is enabled > > to run OpenGL ES apps it won't run desktop-like OpenGL apps or desktop > > environments that need OpenGL. > > There is a shim library to translate OpenGL calls to OpenGL ES calls > so you can run desktop OpenGL applications that use OpenGL features > for which the translation was already added. > I don't remember the exact library name, unfortunately. > I have searched for it on the internet, but i can find it. If you remember the lib name please tell me. > Thanks > > Michal > Best regards, Xinliang
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