[RFC 4/6] drm: simpledrm: add fbdev fallback support

[David Herrmann]

Hi

On Wed, Jun 26, 2013 at 10:59 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
> On 06/24/2013 04:27 PM, David Herrmann wrote:
>> Create a simple fbdev device during SimpleDRM setup so legacy user-space
>> and fbcon can use it.
>>
>> fbdev deletion is quite buggy. A unregister_framebuffer() call followed by
>> a printk() causes NULL-derefs in hide_cursor() and other places in the VT
>> layer. Hence, we leak the fbdev device currently to make the VT layer
>> happy. This needs to be fixed soon! Otherwise, we need a "depends !VT"
>> line for SimpleDRM.
>
>> diff --git a/drivers/gpu/drm/simpledrm/Makefile b/drivers/gpu/drm/simpledrm/Makefile
>
>>  simpledrm-y := simpledrm_drv.o simpledrm_main.o simpledrm_mem.o
>>
>> +ifdef CONFIG_DRM_SIMPLEDRM_FBDEV
>> +     simpledrm-y += simpledrm_fbdev.o
>> +endif
>
> I think that's:
>
> + simpledrm-$(CONFIG_DRM_SIMPLEDRM_FBDEV) += simpledrm_fbdev.o

Ugh, I got errors trying that because SIMPLEDRM_FBDEV is a boolean but
SIMPLEDRM is a tristate. But I guess I tried:
obj-$(CONFIG_DRM_SIMPLEDRM_FBDEV) += simpledrm_fbdev.o
which obviously fails if SIMPLEDRM=m and SIMPLEDRM_FBDEV=y. I will try
to fix that.

Thanks
David