RE: [Intel-gfx] [PATCH v5 1/5] drm: Introduce plane and CRTC scaling filter properties

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> -----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.

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
> 
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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