On Thu, Jan 26, 2017 at 07:29:13PM +0100, Wladimir J. van der Laan wrote:
>
> Reviewed-By: Wladimir J. van der Laan <laanwj@xxxxxxxxx>
>
> I do wonder whether we'll need the split formats in practice -
> e.g. the GC3000 on the i.MX6qp, for which I suppose this is being done because
> of tiled buffers support in the PRE, has the "single buffer" feature
> which allows rendering to a single buffer with multiple pixel pipes.
> This is what the Vivante driver uses.
>
> But it can't hurt reserving formats for them.
Yeah, no harm in reserving&documenting them. Patch applied to drm-misc,
I'll probably only do a pull request for it early next week due to -rc6
backmerge reasons.
-Daniel
>
> Wladimir
>
> > > Vivante GC hardware uses simple 4x4 tiled and nested 64x64 supertiled
> > > formats as well as so-called split-tiled variants for dual-pipe
> > > hardware, where even and odd tiles start at different base addresses.
> > >
> > > Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> > > ---
> > > include/uapi/drm/drm_fourcc.h | 41 +++++++++++++++++++++++++++++++++++++++++
> > > 1 file changed, 41 insertions(+)
> > >
> > > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > > index a5890bf44c0af..ec0498cf61756 100644
> > > --- a/include/uapi/drm/drm_fourcc.h
> > > +++ b/include/uapi/drm/drm_fourcc.h
> > > @@ -159,6 +159,7 @@ extern "C" {
> > > #define DRM_FORMAT_MOD_VENDOR_NV 0x03
> > > #define DRM_FORMAT_MOD_VENDOR_SAMSUNG 0x04
> > > #define DRM_FORMAT_MOD_VENDOR_QCOM 0x05
> > > +#define DRM_FORMAT_MOD_VENDOR_VIVANTE 0x06
> > > /* add more to the end as needed */
> > >
> > > #define fourcc_mod_code(vendor, val) \
> > > @@ -233,6 +234,46 @@ extern "C" {
> > > */
> > > #define DRM_FORMAT_MOD_SAMSUNG_64_32_TILE fourcc_mod_code(SAMSUNG, 1)
> > >
> > > +/* Vivante framebuffer modifiers */
> > > +
> > > +/*
> > > + * Vivante 4x4 tiling layout
> > > + *
> > > + * This is a simple tiled layout using tiles of 4x4 pixels in a row-major
> > > + * layout.
> > > + */
> > > +#define DRM_FORMAT_MOD_VIVANTE_TILED fourcc_mod_code(VIVANTE, 1)
> > > +
> > > +/*
> > > + * Vivante 64x64 super-tiling layout
> > > + *
> > > + * This is a tiled layout using 64x64 pixel super-tiles, where each super-tile
> > > + * contains 8x4 groups of 2x4 tiles of 4x4 pixels (like above) each, all in row-
> > > + * major layout.
> > > + *
> > > + * For more information: see
> > > + * https://github.com/etnaviv/etna_viv/blob/master/doc/hardware.md#texture-tiling
> > > + */
> > > +#define DRM_FORMAT_MOD_VIVANTE_SUPER_TILED fourcc_mod_code(VIVANTE, 2)
> > > +
> > > +/*
> > > + * Vivante 4x4 tiling layout for dual-pipe
> > > + *
> > > + * Same as the 4x4 tiling layout, except every second 4x4 pixel tile starts at a
> > > + * different base address. Offsets from the base addresses are therefore halved
> > > + * compared to the non-split tiled layout.
> > > + */
> > > +#define DRM_FORMAT_MOD_VIVANTE_SPLIT_TILED fourcc_mod_code(VIVANTE, 3)
> > > +
> > > +/*
> > > + * Vivante 64x64 super-tiling layout for dual-pipe
> > > + *
> > > + * Same as the 64x64 super-tiling layout, except every second 4x4 pixel tile
> > > + * starts at a different base address. Offsets from the base addresses are
> > > + * therefore halved compared to the non-split super-tiled layout.
> > > + */
> > > +#define DRM_FORMAT_MOD_VIVANTE_SPLIT_SUPER_TILED fourcc_mod_code(VIVANTE, 4)
> >
> > Does this mean the dual-pipe stuff has 2 planes? Do you need Ville's
> > driver-private format stuff for this?
> >
> > Also, someone else with clue needs to review this before I can pull it in
> > :-)
> > -Daniel
> >
> > > +
> > > #if defined(__cplusplus)
> > > }
> > > #endif
> > > --
> > > 2.11.0
> > >
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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