> -----Original Message-----
> From: Shankar, Uma <uma.shankar@xxxxxxxxx>
> Sent: 19 August 2020 13:44
> To: Laxminarayan Bharadiya, Pankaj
> <pankaj.laxminarayan.bharadiya@xxxxxxxxx>; jani.nikula@xxxxxxxxxxxxxxx;
> daniel@xxxxxxxx; intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-
> devel@xxxxxxxxxxxxxxxxxxxxx; ville.syrjala@xxxxxxxxxxxxxxx;
> daniels@xxxxxxxxxxxxx; Lattannavar, Sameer
> <sameer.lattannavar@xxxxxxxxx>; Maarten Lankhorst
> <maarten.lankhorst@xxxxxxxxxxxxxxx>; Maxime Ripard <mripard@xxxxxxxxxx>;
> Thomas Zimmermann <tzimmermann@xxxxxxx>; David Airlie <airlied@xxxxxxxx>
> Subject: RE: [Intel-gfx] [PATCH v5 1/5] drm: Introduce plane and CRTC scaling
> filter properties
>
>
>
> > -----Original Message-----
> > From: Intel-gfx <intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of
> > Pankaj Bharadiya
> > Sent: Monday, August 3, 2020 10:00 AM
> > To: jani.nikula@xxxxxxxxxxxxxxx; daniel@xxxxxxxx;
> > intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
> > ville.syrjala@xxxxxxxxxxxxxxx; daniels@xxxxxxxxxxxxx; Lattannavar,
> > Sameer <sameer.lattannavar@xxxxxxxxx>; Maarten Lankhorst
> > <maarten.lankhorst@xxxxxxxxxxxxxxx>; Maxime Ripard
> > <mripard@xxxxxxxxxx>; Thomas Zimmermann <tzimmermann@xxxxxxx>;
> David
> > Airlie <airlied@xxxxxxxx>
> > Subject: [Intel-gfx] [PATCH v5 1/5] drm: Introduce plane and CRTC
> > scaling filter properties
> >
> > Introduce per-plane and per-CRTC scaling filter properties to allow
> > userspace to select the driver's default scaling filter or
> > Nearest-neighbor(NN) filter for upscaling operations on CRTC and plane.
> >
> > Drivers can set up this property for a plane by calling
> > drm_plane_create_scaling_filter() and for a CRTC by calling
> > drm_crtc_create_scaling_filter().
> >
> > NN filter works by filling in the missing color values in the upscaled
> > image with that of the coordinate-mapped nearest source pixel value.
> >
> > NN filter for integer multiple scaling can be particularly useful for
> > for pixel art games that rely on sharp, blocky images to deliver their distinctive
> look.
> >
> > changes since v3:
> > * Refactor code, add new function for common code (Ville) changes since v2:
> > * Create per-plane and per-CRTC scaling filter property (Ville) changes since
> v1:
> > * None
> > changes since RFC:
> > * Add separate properties for plane and CRTC (Ville)
> >
> > Signed-off-by: Pankaj Bharadiya
> > <pankaj.laxminarayan.bharadiya@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/drm_atomic_uapi.c | 8 +++
> > drivers/gpu/drm/drm_crtc.c | 48 +++++++++++++++
> > drivers/gpu/drm/drm_crtc_internal.h | 3 +
> > drivers/gpu/drm/drm_plane.c | 90 +++++++++++++++++++++++++++++
> > include/drm/drm_crtc.h | 16 +++++
> > include/drm/drm_plane.h | 21 +++++++
> > 6 files changed, 186 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_atomic_uapi.c
> > b/drivers/gpu/drm/drm_atomic_uapi.c
> > index 25c269bc4681..ef82009035e6 100644
> > --- a/drivers/gpu/drm/drm_atomic_uapi.c
> > +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> > @@ -469,6 +469,8 @@ static int drm_atomic_crtc_set_property(struct
> > drm_crtc *crtc,
> > return -EFAULT;
> >
> > set_out_fence_for_crtc(state->state, crtc, fence_ptr);
> > + } else if (property == crtc->scaling_filter_property) {
> > + state->scaling_filter = val;
> > } else if (crtc->funcs->atomic_set_property) {
> > return crtc->funcs->atomic_set_property(crtc, state, property,
> > val);
> > } else {
> > @@ -503,6 +505,8 @@ drm_atomic_crtc_get_property(struct drm_crtc *crtc,
> > *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
> > else if (property == config->prop_out_fence_ptr)
> > *val = 0;
> > + else if (property == crtc->scaling_filter_property)
> > + *val = state->scaling_filter;
> > else if (crtc->funcs->atomic_get_property)
> > return crtc->funcs->atomic_get_property(crtc, state, property,
> > val);
> > else
> > @@ -585,6 +589,8 @@ static int drm_atomic_plane_set_property(struct
> > drm_plane *plane,
> > sizeof(struct drm_rect),
> > &replaced);
> > return ret;
> > + } else if (property == plane->scaling_filter_property) {
> > + state->scaling_filter = val;
> > } else if (plane->funcs->atomic_set_property) {
> > return plane->funcs->atomic_set_property(plane, state,
> > property, val);
> > @@ -643,6 +649,8 @@ drm_atomic_plane_get_property(struct drm_plane
> > *plane,
> > } else if (property == config->prop_fb_damage_clips) {
> > *val = (state->fb_damage_clips) ?
> > state->fb_damage_clips->base.id : 0;
> > + } else if (property == plane->scaling_filter_property) {
> > + *val = state->scaling_filter;
> > } else if (plane->funcs->atomic_get_property) {
> > return plane->funcs->atomic_get_property(plane, state,
> property,
> > val);
> > } else {
> > diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> > index 283bcc4362ca..70f5cd9704ba 100644
> > --- a/drivers/gpu/drm/drm_crtc.c
> > +++ b/drivers/gpu/drm/drm_crtc.c
> > @@ -776,3 +776,51 @@ int drm_mode_crtc_set_obj_prop(struct
> > drm_mode_object *obj,
> >
> > return ret;
> > }
> > +
> > +/**
> > + * DOC: CRTC scaling filter property
> > + *
> > + * SCALING_FILTER:
> > + *
> > + * Indicates scaling filter to be used for CRTC scaler
> > + *
> > + * The value of this property can be one of the following:
> > + * Default:
> > + * Driver's default scaling filter
> > + * Nearest Neighbor:
> > + * Nearest Neighbor scaling filter
> > + *
> > + * Drivers can set up this property for a CRTC by calling
> > + * drm_crtc_create_scaling_filter_property
> > + */
> > +
> > +/**
> > + * drm_crtc_create_scaling_filter_property - create a new scaling
> > +filter
> > + * property
> > + *
> > + * @crtc: drm CRTC
> > + * @supported_filters: bitmask of supported scaling filters, must include
> > + * BIT(DRM_SCALING_FILTER_DEFAULT).
> > + *
> > + * This function lets driver to enable the scaling filter property on
> > +a given
> > + * CRTC.
> > + *
> > + * RETURNS:
> > + * Zero for success or -errno
> > + */
> > +int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc,
> > + unsigned int supported_filters) {
> > + struct drm_property *prop =
> > + drm_create_scaling_filter_prop(crtc->dev, supported_filters);
> > +
> > + if (IS_ERR(prop))
> > + return PTR_ERR(prop);
> > +
> > + drm_object_attach_property(&crtc->base, prop,
> > + DRM_SCALING_FILTER_DEFAULT);
> > + crtc->scaling_filter_property = prop;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_crtc_create_scaling_filter_property);
> > diff --git a/drivers/gpu/drm/drm_crtc_internal.h
> > b/drivers/gpu/drm/drm_crtc_internal.h
> > index da96b2f64d7e..54d4cf1233e9 100644
> > --- a/drivers/gpu/drm/drm_crtc_internal.h
> > +++ b/drivers/gpu/drm/drm_crtc_internal.h
> > @@ -72,6 +72,9 @@ int drm_crtc_force_disable(struct drm_crtc *crtc);
> >
> > struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc);
> >
> > +struct drm_property *
> > +drm_create_scaling_filter_prop(struct drm_device *dev,
> > + unsigned int supported_filters);
> > /* IOCTLs */
> > int drm_mode_getcrtc(struct drm_device *dev,
> > void *data, struct drm_file *file_priv); diff --git
> > a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c index
> > b7b90b3a2e38..de3888572684 100644
> > --- a/drivers/gpu/drm/drm_plane.c
> > +++ b/drivers/gpu/drm/drm_plane.c
> > @@ -1231,3 +1231,93 @@ int drm_mode_page_flip_ioctl(struct drm_device
> > *dev,
> >
> > return ret;
> > }
> > +
> > +struct drm_property *
> > +drm_create_scaling_filter_prop(struct drm_device *dev,
> > + unsigned int supported_filters) {
>
> This property is used generically by crtc and plane. Can we move this function
> outside the plane file to a more generic location. We could use
> drm_mode_config.c for instance.
I feel, drm_mode_config.c is not the correct place to handle this property as
this is an optional property and optional property implementation details
are handled in separate files (e.g. drm_color_mgmt.c for COLOR_ENCODING).
I think, ideally new file should get added for handling interger scaling property but
not sure if it makes sense for just one function. I prefer to keep it at present place.
Any suggestions..?
Thanks,
Pankaj
>
> Other than this, it looks good to me.
> Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>
>
> > + struct drm_property *prop;
> > + static const struct drm_prop_enum_list props[] = {
> > + { DRM_SCALING_FILTER_DEFAULT, "Default" },
> > + { DRM_SCALING_FILTER_NEAREST_NEIGHBOR, "Nearest
> > Neighbor" },
> > + };
> > + unsigned int valid_mode_mask = BIT(DRM_SCALING_FILTER_DEFAULT)
> |
> > +
> > BIT(DRM_SCALING_FILTER_NEAREST_NEIGHBOR);
> > + int i;
> > +
> > + if (WARN_ON((supported_filters & ~valid_mode_mask) ||
> > + ((supported_filters & BIT(DRM_SCALING_FILTER_DEFAULT))
> ==
> > 0)))
> > + return ERR_PTR(-EINVAL);
> > +
> > + prop = drm_property_create(dev, DRM_MODE_PROP_ENUM,
> > + "SCALING_FILTER",
> > + hweight32(supported_filters));
> > + if (!prop)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + for (i = 0; i < ARRAY_SIZE(props); i++) {
> > + int ret;
> > +
> > + if (!(BIT(props[i].type) & supported_filters))
> > + continue;
> > +
> > + ret = drm_property_add_enum(prop, props[i].type,
> > + props[i].name);
> > +
> > + if (ret) {
> > + drm_property_destroy(dev, prop);
> > +
> > + return ERR_PTR(ret);
> > + }
> > + }
> > +
> > + return prop;
> > +}
> > +
> > +/**
> > + * DOC: Plane scaling filter property
> > + *
> > + * SCALING_FILTER:
> > + *
> > + * Indicates scaling filter to be used for plane scaler
> > + *
> > + * The value of this property can be one of the following:
> > + * Default:
> > + * Driver's default scaling filter
> > + * Nearest Neighbor:
> > + * Nearest Neighbor scaling filter
> > + *
> > + * Drivers can set up this property for a plane by calling
> > + * drm_plane_create_scaling_filter_property
> > + */
> > +
> > +/**
> > + * drm_plane_create_scaling_filter_property - create a new scaling
> > +filter
> > + * property
> > + *
> > + * @plane: drm plane
> > + * @supported_filters: bitmask of supported scaling filters, must include
> > + * BIT(DRM_SCALING_FILTER_DEFAULT).
> > + *
> > + * This function lets driver to enable the scaling filter property on
> > +a given
> > + * plane.
> > + *
> > + * RETURNS:
> > + * Zero for success or -errno
> > + */
> > +int drm_plane_create_scaling_filter_property(struct drm_plane *plane,
> > + unsigned int supported_filters) {
> > + struct drm_property *prop =
> > + drm_create_scaling_filter_prop(plane->dev, supported_filters);
> > +
> > + if (IS_ERR(prop))
> > + return PTR_ERR(prop);
> > +
> > + drm_object_attach_property(&plane->base, prop,
> > + DRM_SCALING_FILTER_DEFAULT);
> > + plane->scaling_filter_property = prop;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_plane_create_scaling_filter_property);
> > diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index
> > 59b51a09cae6..ba839e5e357d 100644
> > --- a/include/drm/drm_crtc.h
> > +++ b/include/drm/drm_crtc.h
> > @@ -324,6 +324,13 @@ struct drm_crtc_state {
> > */
> > bool self_refresh_active;
> >
> > + /**
> > + * @scaling_filter:
> > + *
> > + * Scaling filter to be applied
> > + */
> > + enum drm_scaling_filter scaling_filter;
> > +
> > /**
> > * @event:
> > *
> > @@ -1083,6 +1090,12 @@ struct drm_crtc {
> > /** @properties: property tracking for this CRTC */
> > struct drm_object_properties properties;
> >
> > + /**
> > + * @scaling_filter_property: property to apply a particular filter while
> > + * scaling.
> > + */
> > + struct drm_property *scaling_filter_property;
> > +
> > /**
> > * @state:
> > *
> > @@ -1266,4 +1279,7 @@ static inline struct drm_crtc
> > *drm_crtc_find(struct drm_device *dev, #define drm_for_each_crtc(crtc, dev)
> \
> > list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head)
> >
> > +int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc,
> > + unsigned int supported_filters);
> > +
> > #endif /* __DRM_CRTC_H__ */
> > diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h index
> > 3f396d94afe4..1d82b264e5e4 100644
> > --- a/include/drm/drm_plane.h
> > +++ b/include/drm/drm_plane.h
> > @@ -35,6 +35,11 @@ struct drm_crtc;
> > struct drm_printer;
> > struct drm_modeset_acquire_ctx;
> >
> > +enum drm_scaling_filter {
> > + DRM_SCALING_FILTER_DEFAULT,
> > + DRM_SCALING_FILTER_NEAREST_NEIGHBOR,
> > +};
> > +
> > /**
> > * struct drm_plane_state - mutable plane state
> > *
> > @@ -214,6 +219,13 @@ struct drm_plane_state {
> > */
> > bool visible;
> >
> > + /**
> > + * @scaling_filter:
> > + *
> > + * Scaling filter to be applied
> > + */
> > + enum drm_scaling_filter scaling_filter;
> > +
> > /**
> > * @commit: Tracks the pending commit to prevent use-after-free
> > conditions,
> > * and for async plane updates.
> > @@ -724,6 +736,12 @@ struct drm_plane {
> > * See drm_plane_create_color_properties().
> > */
> > struct drm_property *color_range_property;
> > +
> > + /**
> > + * @scaling_filter_property: property to apply a particular filter while
> > + * scaling.
> > + */
> > + struct drm_property *scaling_filter_property;
> > };
> >
> > #define obj_to_plane(x) container_of(x, struct drm_plane, base) @@
> > -862,4
> > +880,7 @@ drm_plane_get_damage_clips(const struct drm_plane_state
> > +*state)
> > state->fb_damage_clips->data : NULL);
> }
> >
> > +int drm_plane_create_scaling_filter_property(struct drm_plane *plane,
> > + unsigned int supported_filters);
> > +
> > #endif
> > --
> > 2.23.0
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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