[PATCH 0/3] drm/fsl-dcu: fix driver remove/DRM unload

From: Stefan Agner
Date: Wed Oct 19 2016 - 20:34:26 EST

Hi All,

The first patch is a better alternative to the previously posted
patch ("drm/fsl-dcu: only init fbdev if required") as suggested
by Daniel.

The second and third are fix related issue uncovered during tests
with bind/unbind:
echo 40058000.dcu > /sys/bus/platform/drivers/fsl-dcu/unbind
echo 40058000.dcu > /sys/bus/platform/drivers/fsl-dcu/bind

Especially the third patch I am not sure if that is a reasonable
strategy to fix the issue. I did not saw another SoC DRM driver
which is making use of drm_crtc_force_disable_all...

Also, when the X Server is running (with modesetting driver) I
still get a warning:

WARNING: CPU: 0 PID: 452 at drivers/gpu/drm/drm_crtc.c:1154 drm_mode_config_cleanup+0x210/0x220

The comment says it is the drivers fault, but as far as I can
tell it is user space which does not free up this framebuffers.
Is there something missing in my driver?

Any ideas?


Stefan Agner (3):
drm/fb_cma_helper: do not free fbdev if there is none
drm/fsl-dcu: unload driver before disabling clocks
drm/fsl-dcu: disable outputs before unloading driver

drivers/gpu/drm/drm_fb_cma_helper.c | 3 ++-
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)