bug in autoloading of imx-ipuv3-crtc

[Dennis Gilmore]

On Tuesday, April 19, 2016 2:27:17 PM CDT Dennis Gilmore wrote:
> On Tuesday, April 19, 2016 7:50:49 PM CDT Russell King - ARM Linux wrote:
> > On Tue, Apr 19, 2016 at 01:34:23PM -0500, Dennis Gilmore wrote:
> > > Hi All,
> > > 
> > > on all of my i.MX6 systems imx-ipuv3-crtc ius not getting automatically
> > > loaded.  Everything is built as a module
> > > 
> > > CONFIG_DRM_IMX=m
> > > CONFIG_DRM_IMX_FB_HELPER=m
> > > CONFIG_DRM_IMX_HDMI=m
> > > CONFIG_DRM_IMX_IPUV3=m
> > > CONFIG_DRM_IMX_LDB=m
> > > CONFIG_DRM_IMX_PARALLEL_DISPLAY=m
> > > CONFIG_DRM_IMX_TVE=m
> > > CONFIG_IMX_IPUV3_CORE=m
> > > 
> > > The result is that until I log in via serial or ssh and modprobe the
> > > module there is no display.  I suspect that there is some devicetree
> > > glue missing 4.4 and 4.5 seem to both be effected.
> > 
> > DT doesn't come into it for imx-ipuv3-crtc - these platform devices are
> > created by drivers/gpu/ipu-v3/ipu-common.c itself.
> > 
> > drivers/gpu/drm/imx/ipuv3-crtc.c contains the proper module alias which
> > should result in the module loaded at boot time when the imx-ipuv3-crtc
> > devices are created.
> > 
> > Could the problem be that imx-ipu-v3 isn't being loaded?  However, again,
> > it looks to me like everything is correct there.
> > 
> > Are you saying that this used to work in older kernel versions like 4.3,
> > but stopped in 4.4?
> 
> yers it used to work and stopped working. I would need to go back and test
> old kernels to figure out where it broke.

after installing some old kernels it broke with 4.4-rc4 which included a patch 
with teh subject of "drm/imx: Remove of_node assignment from ipuv3-crtc driver 
probe"

Dennis
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