Re: bug in autoloading of imx-ipuv3-crtc

[Dennis Gilmore <dennis@ausil.us>]

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On Thursday, April 21, 2016 1:03:17 AM CDT Uwe Kleine-König wrote:
> Hello,
> 
> On Tue, Apr 19, 2016 at 03:16:01PM -0500, Dennis Gilmore wrote:
> > 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:
> > > > > 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"
> 
> Just to be sure: 4.4-rc4 with 407c9eba7897 ("drm/imx: Remove of_node
> assignment from ipuv3-crtc driver probe") reverted works fine for you?
I can confirm that reverting just that patch makes things work again

Dennis

> 
> Best regards
> Uwe


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