[PATCH libdrm] drm: Remove create_handle() drm_framebuffer "virtual".

[Joe Kniss]

On Wed, Aug 9, 2017 at 4:13 PM, Joe Kniss <djmk at google.com> wrote:
> On Wed, Aug 9, 2017 at 12:14 PM, Noralf Trønnes <noralf at tronnes.org> wrote:
>>
>> Den 09.08.2017 01.42, skrev Joe Kniss:
>>>
>>> Because all drivers currently use gem objects for framebuffer planes,
>>> the virtual create_handle() is not required.  This change adds a
>>> struct drm_gem_object *gems[4] field to drm_framebuffer and removes
>>> create_handle() function pointer from drm_framebuffer_funcs.  The
>>> corresponding *_create_handle() function is removed from each driver.
>>>
>>> In many cases this change eliminates a struct *_framebuffer object,
>>> as the only need for the derived struct is the addition of the gem
>>> object pointer.
>>>
>>> TESTED: compiled: allyesconfig ARCH=x86,arm platforms:i915, rockchip
>>>
>>> Signed-off-by: Joe Kniss <djmk at google.com>
>>> ---
>>
>>
>> Hi Joe,
>>
>> I'm also looking into adding gem objs to drm_framebuffer in this patch:
>> [PATCH v2 01/22] drm: Add GEM backed framebuffer library
>> https://lists.freedesktop.org/archives/dri-devel/2017-August/149782.html
>>
>
> Great.  There's only minimal overlap here.  I'll rebase this change on yours
> once it's in.
>
>> [...]
>>
>>> diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c
>>> b/drivers/gpu/drm/drm_fb_cma_helper.c
>>> index ade319d10e70..f5f011b910b1 100644
>>> --- a/drivers/gpu/drm/drm_fb_cma_helper.c
>>> +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
>>> @@ -31,14 +31,9 @@
>>>     #define DEFAULT_FBDEFIO_DELAY_MS 50
>>>   -struct drm_fb_cma {
>>> -       struct drm_framebuffer          fb;
>>> -       struct drm_gem_cma_object       *obj[4];
>>> -};
>>> -
>>>   struct drm_fbdev_cma {
>>>         struct drm_fb_helper    fb_helper;
>>> -       struct drm_fb_cma       *fb;
>>> +       struct drm_framebuffer  *fb;
>>
>>
>> This fb pointer isn't necessary, since fb_helper already has one.
>>

So, looking deeper into this, it seems that the struct
drm_framebuffer_funcs *fb_funcs is also redundant here?  In which case
this whole struct can go...

>
> I'll remove it... but I am sure when I look deeper there will be more
> of these in the various drivers too.
>
>> Noralf.
>>
>>
>
> -joe