[PATCH v2 1/3] media: vsp1: add premultiplied alpha support

[Laurent Pinchart]

Mauro, would you be fine with this patch going through the DRM tree for
v6.1 ? I don't foresee any risk of conflict with other changes to the
VSP driver scheduled for the next kernel version. If that's fine with
you, could you give an Acked-by ? Otherwise I can send you a pull
request to create an immutable branch and base the rest on it in my pull
request for DRM, but given how small this change is, it seems a bit
overkill.

On Fri, Aug 19, 2022 at 05:01:10AM +0300, Laurent Pinchart wrote:
> Hi Hayama-san,
> 
> Thank you for the patch.
> 
> On Wed, Aug 10, 2022 at 05:37:09PM +0900, Takanari Hayama wrote:
> > To support DRM blend mode in R-Car DU driver, we must be able to pass
> > a plane with the premultiplied alpha. Adding a new property to
> > vsp1_du_atomic_config allows the R-Car DU driver to pass the
> > premultiplied alpha plane.
> > 
> > Signed-off-by: Takanari Hayama <taki at igel.co.jp>
> > ---
> >  drivers/media/platform/renesas/vsp1/vsp1_drm.c | 2 ++
> >  include/media/vsp1.h                           | 2 ++
> >  2 files changed, 4 insertions(+)
> > 
> > diff --git a/drivers/media/platform/renesas/vsp1/vsp1_drm.c b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
> > index 0c2507dc03d6..019e18976bd8 100644
> > --- a/drivers/media/platform/renesas/vsp1/vsp1_drm.c
> > +++ b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
> > @@ -856,6 +856,8 @@ int vsp1_du_atomic_update(struct device *dev, unsigned int pipe_index,
> >  	rpf->mem.addr[1] = cfg->mem[1];
> >  	rpf->mem.addr[2] = cfg->mem[2];
> >  
> > +	rpf->format.flags = (cfg->premult) ? V4L2_PIX_FMT_FLAG_PREMUL_ALPHA : 0;
> 
> I'll drop the parentheses when applying.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> 
> > +
> >  	vsp1->drm->inputs[rpf_index].crop = cfg->src;
> >  	vsp1->drm->inputs[rpf_index].compose = cfg->dst;
> >  	vsp1->drm->inputs[rpf_index].zpos = cfg->zpos;
> > diff --git a/include/media/vsp1.h b/include/media/vsp1.h
> > index cc1b0d42ce95..48f4a5023d81 100644
> > --- a/include/media/vsp1.h
> > +++ b/include/media/vsp1.h
> > @@ -51,6 +51,7 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
> >   * @dst: destination rectangle on the display (integer coordinates)
> >   * @alpha: alpha value (0: fully transparent, 255: fully opaque)
> >   * @zpos: Z position of the plane (from 0 to number of planes minus 1)
> > + * @premult: true for premultiplied alpha
> >   */
> >  struct vsp1_du_atomic_config {
> >  	u32 pixelformat;
> > @@ -60,6 +61,7 @@ struct vsp1_du_atomic_config {
> >  	struct v4l2_rect dst;
> >  	unsigned int alpha;
> >  	unsigned int zpos;
> > +	bool premult;
> >  };
> >  
> >  /**

-- 
Regards,

Laurent Pinchart