[Buildroot] [PATCH v2] qt5base: don't enable KMS if it doesn't have udev

[Peter Seiderer]

Hello Akihiko, Thomas,

On Sun, 17 Jul 2016 11:05:57 +0900, Akihiko Odaki <akihiko.odaki.4i at stu.hosei.ac.jp> wrote:

> Hi,
> 
> On 2016-07-09 03:53, Thomas Petazzoni wrote:
> > Thanks for this new iteration. When you send a patch that fixes an
> > autobuilder failure, please include something like this in the commit
> > log:
> >
> > Fixes:
> >
> >     http://autobuild.buildroot.org/results/....
> >
> > (which should point to the autobuilder failure being fixed by this
> > patch).
> 
> I see. I'll keep in mind.
> 
> > However, I have some comments below.
> >
> >> diff --git a/package/qt5/qt5base/qt5base.mk b/package/qt5/qt5base/qt5base.mk
> >> index bf541b0..60b4e94 100644
> >> --- a/package/qt5/qt5base/qt5base.mk
> >> +++ b/package/qt5/qt5base/qt5base.mk
> >> @@ -30,8 +30,11 @@ QT5BASE_CONFIGURE_OPTS += \
> >>
> >>  # Uses libgbm from mesa3d
> >>  ifeq ($(BR2_PACKAGE_MESA3D_OPENGL_EGL),y)
> >> -QT5BASE_CONFIGURE_OPTS += -kms -gbm
> >> +QT5BASE_CONFIGURE_OPTS += -gbm
> >>  QT5BASE_DEPENDENCIES += mesa3d
> >> +ifeq ($(BR2_PACKAGE_HAS_UDEV),y)
> >> +QT5BASE_CONFIGURE_OPTS += -kms
> >> +endif
> >
> > Does it really make sense to enable GBM without KMS? The only place
> > where I see GBM actually being used in Qt's configure script is:
> >
> > if [ "$CFG_EGLFS" = "yes" ] && [ "$CFG_KMS" = "yes" ] && [ "$CFG_GBM" = "yes" ]; then
> >     QT_CONFIG="$QT_CONFIG eglfs_gbm"
> >     CFG_EGLFS_GBM="yes"
> >
> > Which seems to indicate that *both* KMS and GBM are needed in order to
> > enable the eglfs_gbm module. Can you check this? If that's the case,
> > then a better patch would be:
> >
> > ifeq ($(BR2_PACKAGE_MESA3D_OPENGL_EGL)$(BR2_PACKAGE_HAS_UDEV),yy)
> > QT5BASE_CONFIGURE_OPTS += -kms -gbm
> > else
> > ...
> > endif
> 
> It has another configuration.
> 
> if [ "$CFG_GBM" = "yes" ]; then
>       QT_CONFIG="$QT_CONFIG gbm"
> fi
> 
> I have no idea what it means. It doesn't mean anything as far as I see. 
> But considering it has the configuration, Qt may have some intension to 
> do something with it. I think gbm should be set even if kms is not set.
> 
> Regards,
> Akihiko Odaki

There is a upstream patch [1] to remove the libudev dependency from kms
(simply not needed), just send a buildroot patch [2] using this solution...

Regards,
Peter

[1] https://code.qt.io/cgit/qt/qtbase.git/patch/?id=72492735b7b7770808fcc9fe067e8f03fab827fc
[2] http://lists.busybox.net/pipermail/buildroot/2016-August/170316.html

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