[Intel-gfx] [PATCH] drm/fourcc: Document the Intel CCS modifiers' CC plane expected pitch

[Imre Deak]

On Sat, Jun 25, 2022 at 12:38:50AM +0300, Chery, Nanley G wrote:
> +Jordan (FYI)
> 
> I think the commit message has an extra "color" next to "CC".

IIUC, i915 calls all the planes contained in a framebuffer "color
planes" for consistency (so main-, aux-, CC color planes).

> With or without that dropped,
> 
> Reviewed-by: Nanley Chery <nanley.g.chery at intel.com>

The patch is pushed to drm-misc-next, thanks for the reviews.

--Imre

> Thanks for the fix.
> 
> > -----Original Message-----
> > From: Deak, Imre <imre.deak at intel.com>
> > Sent: Thursday, June 23, 2022 10:50 AM
> > To: dri-devel at lists.freedesktop.org
> > Cc: intel-gfx at lists.freedesktop.org; Chery, Nanley G <nanley.g.chery at intel.com>
> > Subject: [PATCH] drm/fourcc: Document the Intel CCS modifiers' CC plane expected pitch
> >
> > The driver expects the pitch of the Intel CCS CC color planes to be
> > 64 bytes aligned, adjust the modifier descriptions accordingly.
> >
> > Cc: Nanley Chery <nanley.g.chery at intel.com>
> > Signed-off-by: Imre Deak <imre.deak at intel.com>
> > ---
> >  include/uapi/drm/drm_fourcc.h | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > index f1972154a5940..c1b4cfda75075 100644
> > --- a/include/uapi/drm/drm_fourcc.h
> > +++ b/include/uapi/drm/drm_fourcc.h
> > @@ -559,7 +559,7 @@ extern "C" {
> >   *
> >   * The main surface is Y-tiled and is at plane index 0 whereas CCS is linear
> >   * and at index 1. The clear color is stored at index 2, and the pitch should
> > - * be ignored. The clear color structure is 256 bits. The first 128 bits
> > + * be 64 bytes aligned. The clear color structure is 256 bits. The first 128 bits
> >   * represents Raw Clear Color Red, Green, Blue and Alpha color each represented
> >   * by 32 bits. The raw clear color is consumed by the 3d engine and generates
> >   * the converted clear color of size 64 bits. The first 32 bits store the Lower
> > @@ -612,9 +612,9 @@ extern "C" {
> >   * outside of the GEM object in a reserved memory area dedicated for the
> >   * storage of the CCS data for all RC/RC_CC/MC compressible GEM objects. The
> >   * main surface pitch is required to be a multiple of four Tile 4 widths. The
> > - * clear color is stored at plane index 1 and the pitch should be ignored. The
> > - * format of the 256 bits of clear color data matches the one used for the
> > - * I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC modifier, see its description
> > + * clear color is stored at plane index 1 and the pitch should be 64 bytes
> > + * aligned. The format of the 256 bits of clear color data matches the one used
> > + * for the I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC modifier, see its description
> >   * for details.
> >   */
> >  #define I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC fourcc_mod_code(INTEL, 12)
> > --
> > 2.30.2
>