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| -rw-r--r-- | freedreno/kgsl/README | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/freedreno/kgsl/README b/freedreno/kgsl/README new file mode 100644 index 0000000..c46ba08 --- /dev/null +++ b/freedreno/kgsl/README @@ -0,0 +1,26 @@ +This is a historical description of what is now the kgsl backend +in libdrm freedreno (before the upstream drm/msm driver). Note +that the kgsl backend requires the "kgsl-drm" shim driver, which +usually is in disrepair (QCOM does not build it for android), and +due to random differences between different downstream android +kernel branches it may or may not work. So YMMV. + +Original README: +---------------- + +Note that current msm kernel driver is a bit strange. It provides a +DRM interface for GEM, which is basically sufficient to have DRI2 +working. But it does not provide KMS. And interface to 2d and 3d +cores is via different other devices (/dev/kgsl-*). This is not +quite how I'd write a DRM driver, but at this stage it is useful for +xf86-video-freedreno and fdre (and eventual gallium driver) to be +able to work on existing kernel driver from QCOM, to allow to +capture cmdstream dumps from the binary blob drivers without having +to reboot. So libdrm_freedreno attempts to hide most of the crazy. +The intention is that when there is a proper kernel driver, it will +be mostly just changes in libdrm_freedreno to adapt the gallium +driver and xf86-video-freedreno (ignoring the fbdev->KMS changes). + +So don't look at freedreno as an example of how to write a libdrm +module or a DRM driver.. it is just an attempt to paper over a non- +standard kernel driver architecture. |