On Mon, Sep 12, 2016 at 05:30:32PM +0200, Arnd Bergmann wrote: > The newnly added debug mode for the atmel_mxt_ts driver relies on > the v4l2 interface and vb2_vmalloc, but those might be configured > as loadable modules when the driver itself is built-in, resulting > in a link failure: > > drivers/input/touchscreen/atmel_mxt_ts.o: In function `mxt_vidioc_querycap': > atmel_mxt_ts.c:(.text.mxt_vidioc_querycap+0x10): undefined reference to > `video_devdata' > drivers/input/touchscreen/atmel_mxt_ts.o: In function `mxt_buffer_queue': > atmel_mxt_ts.c:(.text.mxt_buffer_queue+0x20): undefined reference to > `vb2_plane_vaddr' > atmel_mxt_ts.c:(.text.mxt_buffer_queue+0x164): undefined reference to > `vb2_buffer_done' > drivers/input/touchscreen/atmel_mxt_ts.o: In function `mxt_free_object_table': > atmel_mxt_ts.c:(.text.mxt_free_object_table+0x18): undefined reference to > `video_unregister_device' > atmel_mxt_ts.c:(.text.mxt_free_object_table+0x20): undefined reference to > `v4l2_device_unregister' > > The best workaround I could come up with is to disallow the debug > mode unless it's actually possible to call it. > > Signed-off-by: Arnd Bergmann <[email protected]> > Fixes: ecfdd7e2660e ("[media] Input: atmel_mxt_ts - output diagnostic debug > via V4L2 device")
Acked-by: Nick Dyer <[email protected]> > --- > drivers/input/touchscreen/Kconfig | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/input/touchscreen/Kconfig > b/drivers/input/touchscreen/Kconfig > index fce1e41ffe8b..ccf933969587 100644 > --- a/drivers/input/touchscreen/Kconfig > +++ b/drivers/input/touchscreen/Kconfig > @@ -117,7 +117,8 @@ config TOUCHSCREEN_ATMEL_MXT > > config TOUCHSCREEN_ATMEL_MXT_T37 > bool "Support T37 Diagnostic Data" > - depends on TOUCHSCREEN_ATMEL_MXT && VIDEO_V4L2 > + depends on TOUCHSCREEN_ATMEL_MXT > + depends on VIDEO_V4L2=y || (TOUCHSCREEN_ATMEL_MXT=m && VIDEO_V4L2=m) > select VIDEOBUF2_VMALLOC > help > Say Y here if you want support to output data from the T37 > -- > 2.9.0 >
