Mali 450 r6p1 & DMABUF

Hello,

I have been trying to use DMABUF With egl on a Mali 450 (on an odroid C2).

I was able to successfully use it with the following setup for a 1920x1080 image :

const EGLint img_attrs[] = {

          EGL_WIDTH, 1920,

          EGL_HEIGHT, 1080,

          EGL_LINUX_DRM_FOURCC_EXT, DRM_FORMAT_RGBA8888,

          EGL_DMA_BUF_PLANE0_FD_EXT, pbuffer->fd_handle,

          EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0,

          EGL_DMA_BUF_PLANE0_PITCH_EXT, 1920,

          EGL_NONE

      };

eglCreateImageKHR(eglGetCurrentDisplay(), EGL_NO_CONTEXT, EGL_LINUX_DMA_BUF_EXT, 0, img_attrs);

Though RGBA format is not optimal when working with 1080p or 4K images, especially in terms of memory bandwidth.

So I wanted to use either DRM_FORMAT_NV12 or DRM_FORMAT_YUV420.

As far as i have seen DRM_FORMAT_NV12 is described as a two planes format in drm_fourcc.h so i tried the following :

const EGLint img_attrs[] = {

          EGL_WIDTH, 1920,

          EGL_HEIGHT, 1080,

          EGL_LINUX_DRM_FOURCC_EXT, DRM_FORMAT_NV12,

          EGL_DMA_BUF_PLANE0_FD_EXT, pbuffer->fd_handle,

          EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0,

          EGL_DMA_BUF_PLANE0_PITCH_EXT, 1920,

          EGL_DMA_BUF_PLANE1_FD_EXT, pbuffer->fd_handle,

          EGL_DMA_BUF_PLANE1_OFFSET_EXT, 1920*1080,

          EGL_DMA_BUF_PLANE1_PITCH_EXT, 1920 / 2

          EGL_NONE

      };

eglCreateImageKHR(eglGetCurrentDisplay(), EGL_NO_CONTEXT, EGL_LINUX_DMA_BUF_EXT, 0, img_attrs);

This will results in EGL_BAD_PARAMETER error code when using eglCreateImageKHR

I have tried many combinations both for the NV12 DRM format and the YUV420, but i have always ended up with an EGL_BAD_PARAM error when using anything else than RGBA.

Could anyone shed some light on the proper way to configure the attributes, both for YUV420 and NV12 please ?.