[PATCH 0/4] Centralize format information

[Daniel Vetter]

On Tue, Jun 07, 2016 at 02:33:10AM +0300, Laurent Pinchart wrote:
> Hello,
> 
> Various pieces of information about DRM formats (number of planes, color
> depth, chroma subsampling, ...) are scattered across different helper
> functions in the DRM core. Callers of those functions often need to access
> more than a single parameter of the format, leading to inefficiencies due to
> multiple lookups.
> 
> This patch series addresses this issue by centralizing all format information
> in a single data structure (1/4). It reimplements the existing format helper
> functions based on that structure (3/4) and converts the DRM core code to use
> the new structure (4/4). Two unused format helper functions are removed in the
> process (2/4).
> 
> The new API is also useful for drivers. I will shortly post a patch series for
> the omapdrm driver that makes use of it.

I'm still meh on this, but you could convince me if you'd extract all the
format related stuff into drm_fourcc.c. drm_crtc is a mess, and the abi
docs are confusing since everything is in one bag. Splitting parts out
would be awesome. Other stuff I think we could split out is all the
framebuffer handling, basic property stuff, specialized properties (for
zorder, blending, whatever) and maybe even a few more sub-topics. But
let's start somewhere.
-Daniel

> 
> Laurent Pinchart (4):
>   drm: Centralize format information
>   drm: Remove unused drm_format_plane_(width|height) helpers
>   drm: Implement the drm_format_*() helpers as drm_format_info()
>     wrappers
>   drm: Use drm_format_info() in DRM core code
> 
>  drivers/gpu/drm/drm_crtc.c          | 391 +++++++++++-------------------------
>  drivers/gpu/drm/drm_fb_cma_helper.c |  23 ++-
>  include/drm/drm_crtc.h              |  23 ++-
>  3 files changed, 153 insertions(+), 284 deletions(-)
> 
> -- 
> Regards,
> 
> Laurent Pinchart
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch