> > On Wed, Jan 08, 2025 at 11:09:00AM +0530, Arun R Murthy wrote:
> > > Expose drm plane function to create formats/modifiers blob. This
> > > function can be used to expose list of supported formats/modifiers
> > > for sync/async flips.
> > >
> > > Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/drm_plane.c | 44
> > > +++++++++++++++++++++++++++++-------
> > --------
> > > include/drm/drm_plane.h | 4 ++++
> > > 2 files changed, 33 insertions(+), 15 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_plane.c
> > > b/drivers/gpu/drm/drm_plane.c index
> > >
> >
> 416818e54ccffcf3d3aada2723e96ce8ccf1dd97..4f35eec2b7770fcc90c3e07a906
> > 8
> > > b31c0563a4c0 100644
> > > --- a/drivers/gpu/drm/drm_plane.c
> > > +++ b/drivers/gpu/drm/drm_plane.c
> > > @@ -191,7 +191,10 @@ modifiers_ptr(struct drm_format_modifier_blob
> > *blob)
> > > return (struct drm_format_modifier *)(((char *)blob) +
> > > blob->modifiers_offset); }
> > >
> > > -static int create_in_format_blob(struct drm_device *dev, struct
> > > drm_plane *plane)
> > > +int drm_plane_create_format_blob(struct drm_device *dev,
> > > + struct drm_plane *plane, u64 *modifiers,
> > > + unsigned int modifier_count, u32 *formats,
> > > + unsigned int format_count, bool is_async)
> > > {
> > > const struct drm_mode_config *config = &dev->mode_config;
> > > struct drm_property_blob *blob;
> > > @@ -200,14 +203,14 @@ static int create_in_format_blob(struct
> > > drm_device
> > *dev, struct drm_plane *plane
> > > struct drm_format_modifier_blob *blob_data;
> > > unsigned int i, j;
> > >
> > > - formats_size = sizeof(__u32) * plane->format_count;
> > > + formats_size = sizeof(__u32) * format_count;
> > > if (WARN_ON(!formats_size)) {
> > > /* 0 formats are never expected */
> > > return 0;
> > > }
> > >
> > > modifiers_size =
> > > - sizeof(struct drm_format_modifier) * plane->modifier_count;
> > > + sizeof(struct drm_format_modifier) * modifier_count;
> > >
> > > blob_size = sizeof(struct drm_format_modifier_blob);
> > > /* Modifiers offset is a pointer to a struct with a 64 bit field
> > > so it @@ -223,37 +226,45 @@ static int create_in_format_blob(struct
> > > drm_device *dev, struct drm_plane *plane
> > >
> > > blob_data = blob->data;
> > > blob_data->version = FORMAT_BLOB_CURRENT;
> > > - blob_data->count_formats = plane->format_count;
> > > + blob_data->count_formats = format_count;
> > > blob_data->formats_offset = sizeof(struct drm_format_modifier_blob);
> > > - blob_data->count_modifiers = plane->modifier_count;
> > > + blob_data->count_modifiers = modifier_count;
> > >
> > > blob_data->modifiers_offset =
> > > ALIGN(blob_data->formats_offset + formats_size, 8);
> > >
> > > - memcpy(formats_ptr(blob_data), plane->format_types, formats_size);
> > > + memcpy(formats_ptr(blob_data), formats, formats_size);
> > >
> > > mod = modifiers_ptr(blob_data);
> > > - for (i = 0; i < plane->modifier_count; i++) {
> > > - for (j = 0; j < plane->format_count; j++) {
> > > - if (!plane->funcs->format_mod_supported ||
> > > + for (i = 0; i < modifier_count; i++) {
> > > + for (j = 0; j < format_count; j++) {
> > > + if (is_async ||
> > > + !plane->funcs->format_mod_supported ||
> > > plane->funcs->format_mod_supported(plane,
> > > - plane-
> > >format_types[j],
> > > - plane-
> > >modifiers[i])) {
> > > + formats[j],
> > > + modifiers[i])) {
> > > mod->formats |= 1ULL << j;
> > > }
> > > }
> > >
> > > - mod->modifier = plane->modifiers[i];
> > > + mod->modifier = modifiers[i];
> > > mod->offset = 0;
> > > mod->pad = 0;
> > > mod++;
> > > }
> > >
> > > - drm_object_attach_property(&plane->base, config-
> > >modifiers_property,
> > > - blob->base.id);
> > > + if (is_async)
> > > + drm_object_attach_property(&plane->base,
> > > + config->async_modifiers_property,
> > > + blob->base.id);
> > > + else
> > > + drm_object_attach_property(&plane->base,
> > > + config->modifiers_property,
> > > + blob->base.id);
> >
> > IMO the function should only create the blob. Leave it to the caller to attach
> it.
> >
> Prior to this change for sync formats/modifiers the property attach was also
> done in the same function. So retained it as it.
>
> > The 'is_async' parameter could also be replaced with with a function
> > pointer to the appropriate format_mod_supported() function. That makes
> > the implementation entirely generic.
> >
> If the list of formats/modifiers for sync and async is passed to this function, then
> based on the list the corresponding function pointer can be called.
> This was done in the earlier patchset.
>
> > >
> > > return 0;
> > > }
> > > +EXPORT_SYMBOL(drm_plane_create_format_blob);
> > >
> > > /**
> > > * DOC: hotspot properties
> > > @@ -476,7 +487,10 @@ static int __drm_universal_plane_init(struct
> > drm_device *dev,
> > > }
> > >
> > > if (format_modifier_count)
> > > - create_in_format_blob(dev, plane);
> > > + drm_plane_create_format_blob(dev, plane, plane->modifiers,
> > > + format_modifier_count,
> > > + plane->format_types,
> > format_count,
> > > + false);
> > >
> > > return 0;
> > > }
> > > diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h index
> > >
> >
> e8749e6fc3bc0acfc73bbd8401f85c3126e86759..eb84830fbb723e39436bfbadf
> > 369
> > > 894a5657cd45 100644
> > > --- a/include/drm/drm_plane.h
> > > +++ b/include/drm/drm_plane.h
> > > @@ -1008,5 +1008,9 @@ int
> > > drm_plane_create_scaling_filter_property(struct drm_plane *plane,
> > > int
> > drm_plane_add_size_hints_property(struct drm_plane *plane,
> > > const struct drm_plane_size_hint *hints,
> > > int num_hints);
> > > +int drm_plane_create_format_blob(struct drm_device *dev,
> > > + struct drm_plane *plane, u64 *modifiers,
> > > + unsigned int modifier_count, u32 *formats,
> > > + unsigned int format_count, bool is_async);
> >
> > I don't think this needs to be exposed to anyone.
> > __drm_universal_plane_init() should just populate both the normal
> > blob, and and the async blob (iff
> > .format_mod_supported_async() is provided).
> >
> Ok!
>
For __drm_universal_plane_init() to have both the sync/async format/modifiers list we will have to add new elements to struct drm_plane to hold the async formats/modifiers.
Then upon adding new elements in struct drm_plane we may not need to pass a function pointer instead of is_async as commented above as well as this new elements added in the struct drm_plane helps out over here.
New elements to be added to the struct drm_plane
Struct drm_plane {
U32 * formats_async;
U32 format_async_count;
U64 *async_modifiers,
U32 async_modifier_count
}
Then the functionwith below changes it will be generic and no exporting of the func would be required
create_format_blob()
{
If(plane->format_count)
/* Create blob for sync and call the format_mod_supported() */
If(plane->format_async_count)
/* Create blob for async and call the format_mod_async_supported() */
}
Is my understanding correct?
Thanks and Regards,
Arun R Murthy
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