Re: [PATCH 1/3] drm: Introduce scaling filter mode property

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Oct 22, 2019 at 03:29:44PM +0530, Shashank Sharma wrote:
> This patch adds a scaling filter mode porperty
> to allow:
> - A driver/HW to showcase it's scaling filter capabilities.
> - A userspace to pick a desired effect while scaling.
> 
> This option will be particularly useful in the scenarios where
> Integer mode scaling is possible, and a UI client wants to pick
> filters like Nearest-neighbor applied for non-blurry outputs.
> 
> There was a RFC patch series published, to discus the request to enable
> Integer mode scaling by some of the gaming communities, which can be
> found here:
> https://patchwork.freedesktop.org/series/66175/
> 
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> ---
>  drivers/gpu/drm/drm_atomic_uapi.c |  4 ++++
>  include/drm/drm_crtc.h            | 26 ++++++++++++++++++++++++++
>  include/drm/drm_mode_config.h     |  6 ++++++
>  3 files changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
> index 0d466d3b0809..883329453a86 100644
> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> @@ -435,6 +435,8 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
>  		return ret;
>  	} else if (property == config->prop_vrr_enabled) {
>  		state->vrr_enabled = val;
> +	} else if (property == config->scaling_filter_property) {
> +		state->scaling_filter = val;
>  	} else if (property == config->degamma_lut_property) {
>  		ret = drm_atomic_replace_property_blob_from_id(dev,
>  					&state->degamma_lut,
> @@ -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 == config->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
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 5e9b15a0e8c5..94c5509474a8 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -58,6 +58,25 @@ struct device_node;
>  struct dma_fence;
>  struct edid;
>  
> +enum drm_scaling_filters {
> +	DRM_SCALING_FILTER_DEFAULT,
> +	DRM_SCALING_FILTER_MEDIUM,
> +	DRM_SCALING_FILTER_BILINEAR,
> +	DRM_SCALING_FILTER_NN,
> +	DRM_SCALING_FILTER_NN_IS_ONLY,
> +	DRM_SCALING_FILTER_EDGE_ENHANCE,
> +	DRM_SCALING_FILTER_INVALID,
> +};
> +
> +static const struct drm_prop_enum_list drm_scaling_filter_enum_list[] = {
> +	{ DRM_SCALING_FILTER_DEFAULT, "Default" },
> +	{ DRM_SCALING_FILTER_MEDIUM, "Medium" },
> +	{ DRM_SCALING_FILTER_BILINEAR, "Bilinear" },
> +	{ DRM_SCALING_FILTER_NN, "Nearest Neighbor" },
> +	{ DRM_SCALING_FILTER_NN_IS_ONLY, "Integer Mode Scaling" },
> +	{ DRM_SCALING_FILTER_INVALID, "Invalid" },
> +};
> +
>  static inline int64_t U642I64(uint64_t val)
>  {
>  	return (int64_t)*((int64_t *)&val);
> @@ -283,6 +302,13 @@ struct drm_crtc_state {
>  	 */
>  	u32 target_vblank;
>  
> +	/**
> +	 * @scaling_filter:
> +	 *
> +	 * Scaling filter mode to be applied
> +	 */
> +	u32 scaling_filter;
> +
>  	/**
>  	 * @async_flip:
>  	 *
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index 3bcbe30339f0..efd6fd55770f 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -914,6 +914,12 @@ struct drm_mode_config {
>  	 */
>  	struct drm_property *modifiers_property;
>  
> +	/**
> +	 * @scaling_filter_property: CRTC property to apply a particular filter
> +	 * while scaling in panel fitter mode.
> +	 */
> +	struct drm_property *scaling_filter_property;

This needs to per-crtc/plane.

> +
>  	/* cursor size */
>  	uint32_t cursor_width, cursor_height;
>  
> -- 
> 2.17.1

-- 
Ville Syrjälä
Intel
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