Re: [PATCH 1/2] drm/verisilicon: set blend mode for the primary plane

[Icenowy Zheng <zhengxingda@iscas.ac.cn>]

在 2026-09-10四的 09:58 +0200，Thomas Zimmermann写道：
> Hi
> 
> Am 10.09.26 um 09:09 schrieb Icenowy Zheng:
> > 在 2026-09-02三的 01:17 +0800，Icenowy Zheng写道：
> > > Blend modes are now required to expose pixel formats w/ alpha.
> > > 
> > > As it's the primary plane and blending is explicitly disabled,
> > > just
> > > expose PIXEL_NONE blend mode.
> > Gently ping for reviews.
> 
> What do these alpha formats do?  Are they a hardware feature?  It
> looks 
> like they are programmable, but don't differ from XRGB at all.

I think they're for consistency with overlay planes.

Thanks,
Icenowy

> 
> Best regards
> Thomas
> 
> > 
> > Thanks,
> > Icenowy
> > 
> > > Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
> > > ---
> > >   drivers/gpu/drm/verisilicon/vs_primary_plane.c | 3 +++
> > >   1 file changed, 3 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/verisilicon/vs_primary_plane.c
> > > b/drivers/gpu/drm/verisilicon/vs_primary_plane.c
> > > index 1f2be41ae496c..8d58682d88ef8 100644
> > > --- a/drivers/gpu/drm/verisilicon/vs_primary_plane.c
> > > +++ b/drivers/gpu/drm/verisilicon/vs_primary_plane.c
> > > @@ -7,6 +7,7 @@
> > >   
> > >   #include <drm/drm_atomic.h>
> > >   #include <drm/drm_atomic_helper.h>
> > > +#include <drm/drm_blend.h>
> > >   #include <drm/drm_crtc.h>
> > >   #include <drm/drm_fourcc.h>
> > >   #include <drm/drm_framebuffer.h>
> > > @@ -179,5 +180,7 @@ struct drm_plane
> > > *vs_primary_plane_init(struct
> > > drm_device *drm_dev, struct vs_dc
> > >   
> > >   	drm_plane_helper_add(plane,
> > > &vs_primary_plane_helper_funcs);
> > >   
> > > +	drm_plane_create_blend_mode_property(plane,
> > > +					
> > > BIT(DRM_MODE_BLEND_PIXEL_NONE));
> > >   	return plane;
> > >   }