[Intel-gfx] [PATCH 1/3] drm: Introduce scaling filter mode property

[Daniel Vetter]

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 at intel.com>

Two things:

- needs real property docs for this in the kms property chapter
- would be good if we could somehow subsume the panel fitter prop into
  this? Or at least document possible interactions with that.

Plus userspace ofc, recommended best practices is to add a Link: tag
pointing at the userspace patch series/merge request directly to the patch
that adds the new uapi.

Cheers, Daniel
> ---
>  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;
> +
>  	/* cursor size */
>  	uint32_t cursor_width, cursor_height;
>  
> -- 
> 2.17.1
> 
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> Intel-gfx at lists.freedesktop.org
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch