[PATCH v3 1/3] drm: Plumb modifiers through plane init

Liviu Dudau Liviu.Dudau at arm.com
Wed May 17 10:17:57 UTC 2017


On Tue, May 16, 2017 at 02:31:24PM -0700, Ben Widawsky wrote:
> This is the plumbing for supporting fb modifiers on planes. Modifiers
> have already been introduced to some extent, but this series will extend
> this to allow querying modifiers per plane. Based on this, the client to
> enable optimal modifications for framebuffers.
> 
> This patch simply allows the DRM drivers to initialize their list of
> supported modifiers upon initializing the plane.
> 
> v2: A minor addition from Daniel
> 
> v3: Updated commit message
> s/INVALID/DRM_FORMAT_MOD_INVALID (Liviu)
> Remove some excess newlines (Liviu)
> Update comment for > 64 modifiers (Liviu)
> 
> Cc: Liviu Dudau <Liviu.Dudau at arm.com>
> Reviewed-by: Daniel Stone <daniels at collabora.com> (v2)
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>

Minor nits, see below, but otherwise:

Reviewed-by: Liviu Dudau <Liviu.Dudau at arm.com>

Thanks,
Liviu

> ---
>  drivers/gpu/drm/arc/arcpgu_crtc.c               |  1 +
>  drivers/gpu/drm/arm/hdlcd_crtc.c                |  1 +
>  drivers/gpu/drm/arm/malidp_planes.c             |  2 +-
>  drivers/gpu/drm/armada/armada_crtc.c            |  1 +
>  drivers/gpu/drm/armada/armada_overlay.c         |  1 +
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c |  4 ++-
>  drivers/gpu/drm/drm_modeset_helper.c            |  1 +
>  drivers/gpu/drm/drm_plane.c                     | 35 ++++++++++++++++++++++++-
>  drivers/gpu/drm/drm_simple_kms_helper.c         |  3 +++
>  drivers/gpu/drm/exynos/exynos_drm_plane.c       |  2 +-
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c     |  2 +-
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c  |  1 +
>  drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c |  2 +-
>  drivers/gpu/drm/i915/intel_display.c            |  5 +++-
>  drivers/gpu/drm/i915/intel_sprite.c             |  4 +--
>  drivers/gpu/drm/imx/ipuv3-plane.c               |  4 +--
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c        |  2 +-
>  drivers/gpu/drm/meson/meson_plane.c             |  1 +
>  drivers/gpu/drm/msm/mdp/mdp4/mdp4_plane.c       |  2 +-
>  drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c       |  4 +--
>  drivers/gpu/drm/mxsfb/mxsfb_drv.c               |  2 +-
>  drivers/gpu/drm/nouveau/nv50_display.c          |  5 ++--
>  drivers/gpu/drm/omapdrm/omap_plane.c            |  3 ++-
>  drivers/gpu/drm/qxl/qxl_display.c               |  2 +-
>  drivers/gpu/drm/rcar-du/rcar_du_plane.c         |  4 +--
>  drivers/gpu/drm/rcar-du/rcar_du_vsp.c           |  4 +--
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c     |  4 +--
>  drivers/gpu/drm/sti/sti_cursor.c                |  2 +-
>  drivers/gpu/drm/sti/sti_gdp.c                   |  2 +-
>  drivers/gpu/drm/sti/sti_hqvdp.c                 |  2 +-
>  drivers/gpu/drm/sun4i/sun4i_layer.c             |  2 +-
>  drivers/gpu/drm/tegra/dc.c                      | 12 ++++-----
>  drivers/gpu/drm/vc4/vc4_plane.c                 |  2 +-
>  drivers/gpu/drm/virtio/virtgpu_plane.c          |  2 +-
>  drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c             |  4 +--
>  drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c            |  4 +--
>  drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c            |  4 +--
>  drivers/gpu/drm/zte/zx_plane.c                  |  2 +-
>  include/drm/drm_plane.h                         | 20 +++++++++++++-
>  include/drm/drm_simple_kms_helper.h             |  1 +
>  include/uapi/drm/drm_fourcc.h                   | 11 ++++++++
>  41 files changed, 126 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
> index ad9a95916f1f..cd8a24c7c67d 100644
> --- a/drivers/gpu/drm/arc/arcpgu_crtc.c
> +++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
> @@ -218,6 +218,7 @@ static struct drm_plane *arc_pgu_plane_init(struct drm_device *drm)
>  
>  	ret = drm_universal_plane_init(drm, plane, 0xff, &arc_pgu_plane_funcs,
>  				       formats, ARRAY_SIZE(formats),
> +				       NULL,
>  				       DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret)
>  		return ERR_PTR(ret);
> diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
> index 798a3cc480a2..0caa03ae8708 100644
> --- a/drivers/gpu/drm/arm/hdlcd_crtc.c
> +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
> @@ -303,6 +303,7 @@ static struct drm_plane *hdlcd_plane_init(struct drm_device *drm)
>  
>  	ret = drm_universal_plane_init(drm, plane, 0xff, &hdlcd_plane_funcs,
>  				       formats, ARRAY_SIZE(formats),
> +				       NULL,
>  				       DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret) {
>  		devm_kfree(drm->dev, plane);
> diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
> index 814fda23cead..b156610c68a5 100644
> --- a/drivers/gpu/drm/arm/malidp_planes.c
> +++ b/drivers/gpu/drm/arm/malidp_planes.c
> @@ -400,7 +400,7 @@ int malidp_de_planes_init(struct drm_device *drm)
>  					DRM_PLANE_TYPE_OVERLAY;
>  		ret = drm_universal_plane_init(drm, &plane->base, crtcs,
>  					       &malidp_de_plane_funcs, formats,
> -					       n, plane_type, NULL);
> +					       n, NULL, plane_type, NULL);
>  		if (ret < 0)
>  			goto cleanup;
>  
> diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
> index 4fe19fde84f9..ea48ef88f0e4 100644
> --- a/drivers/gpu/drm/armada/armada_crtc.c
> +++ b/drivers/gpu/drm/armada/armada_crtc.c
> @@ -1269,6 +1269,7 @@ static int armada_drm_crtc_create(struct drm_device *drm, struct device *dev,
>  				       &armada_primary_plane_funcs,
>  				       armada_primary_formats,
>  				       ARRAY_SIZE(armada_primary_formats),
> +				       NULL,
>  				       DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret) {
>  		kfree(primary);
> diff --git a/drivers/gpu/drm/armada/armada_overlay.c b/drivers/gpu/drm/armada/armada_overlay.c
> index 424e465ff407..0054144287ae 100644
> --- a/drivers/gpu/drm/armada/armada_overlay.c
> +++ b/drivers/gpu/drm/armada/armada_overlay.c
> @@ -460,6 +460,7 @@ int armada_overlay_plane_create(struct drm_device *dev, unsigned long crtcs)
>  				       &armada_ovl_plane_funcs,
>  				       armada_ovl_formats,
>  				       ARRAY_SIZE(armada_ovl_formats),
> +				       NULL,
>  				       DRM_PLANE_TYPE_OVERLAY, NULL);
>  	if (ret) {
>  		kfree(dplane);
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index 29cc10d053eb..b5c6cf2d8c36 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -1058,7 +1058,9 @@ static int atmel_hlcdc_plane_create(struct drm_device *dev,
>  	ret = drm_universal_plane_init(dev, &plane->base, 0,
>  				       &layer_plane_funcs,
>  				       desc->formats->formats,
> -				       desc->formats->nformats, type, NULL);
> +				       desc->formats->nformats,
> +				       NULL,
> +				       type, NULL);
>  	if (ret)
>  		return ret;
>  
> diff --git a/drivers/gpu/drm/drm_modeset_helper.c b/drivers/gpu/drm/drm_modeset_helper.c
> index 2b33825f2f93..9cb1eede0b4d 100644
> --- a/drivers/gpu/drm/drm_modeset_helper.c
> +++ b/drivers/gpu/drm/drm_modeset_helper.c
> @@ -124,6 +124,7 @@ static struct drm_plane *create_primary_plane(struct drm_device *dev)
>  				       &drm_primary_helper_funcs,
>  				       safe_modeset_formats,
>  				       ARRAY_SIZE(safe_modeset_formats),
> +				       NULL,
>  				       DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret) {
>  		kfree(primary);
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index fedd4d60d9cd..20203871e06d 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -70,6 +70,8 @@ static unsigned int drm_num_planes(struct drm_device *dev)
>   * @funcs: callbacks for the new plane
>   * @formats: array of supported formats (DRM_FORMAT\_\*)
>   * @format_count: number of elements in @formats
> + * @format_modifiers: array of struct drm_format modifiers terminated by
> + *                    DRM_FORMAT_MOD_INVALID
>   * @type: type of plane (overlay, primary, cursor)
>   * @name: printf style format string for the plane name, or NULL for default name
>   *
> @@ -82,10 +84,12 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
>  			     uint32_t possible_crtcs,
>  			     const struct drm_plane_funcs *funcs,
>  			     const uint32_t *formats, unsigned int format_count,
> +			     const uint64_t *format_modifiers,
>  			     enum drm_plane_type type,
>  			     const char *name, ...)
>  {
>  	struct drm_mode_config *config = &dev->mode_config;
> +	unsigned int format_modifier_count = 0;
>  	int ret;
>  
>  	ret = drm_mode_object_add(dev, &plane->base, DRM_MODE_OBJECT_PLANE);
> @@ -105,6 +109,30 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
>  		return -ENOMEM;
>  	}
>  
> +	/* First driver to need more than 64 formats needs to fix this. Each

Kernel's style asks for multi-line comments to start with an empty /* line

> +	 * format is encoded as a bit and the current code only supports a u64.
> +	 */
> +	if (WARN_ON(format_count > 64))
> +		return -EINVAL;
> +
> +	if (format_modifiers) {
> +		const uint64_t *temp_modifiers = format_modifiers;
> +		while (*temp_modifiers++ != DRM_FORMAT_MOD_INVALID)
> +			format_modifier_count++;
> +	}
> +
> +	plane->modifier_count = format_modifier_count;
> +	plane->modifiers = kmalloc_array(format_modifier_count,
> +					 sizeof(format_modifiers[0]),
> +					 GFP_KERNEL);
> +
> +	if (format_modifier_count && !plane->modifiers) {
> +		DRM_DEBUG_KMS("out of memory when allocating plane\n");
> +		kfree(plane->format_types);
> +		drm_mode_object_unregister(dev, &plane->base);
> +		return -ENOMEM;
> +	}
> +
>  	if (name) {
>  		va_list ap;
>  
> @@ -117,12 +145,15 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
>  	}
>  	if (!plane->name) {
>  		kfree(plane->format_types);
> +		kfree(plane->modifiers);
>  		drm_mode_object_unregister(dev, &plane->base);
>  		return -ENOMEM;
>  	}
>  
>  	memcpy(plane->format_types, formats, format_count * sizeof(uint32_t));
>  	plane->format_count = format_count;
> +	memcpy(plane->modifiers, format_modifiers,
> +	       format_modifier_count * sizeof(format_modifiers[0]));

I'm still worried that we can reach the memcpy with a NULL format_modifiers and we are opening
a security hole here.

>  	plane->possible_crtcs = possible_crtcs;
>  	plane->type = type;
>  
> @@ -205,7 +236,8 @@ int drm_plane_init(struct drm_device *dev, struct drm_plane *plane,
>  
>  	type = is_primary ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
>  	return drm_universal_plane_init(dev, plane, possible_crtcs, funcs,
> -					formats, format_count, type, NULL);
> +					formats, format_count,
> +					NULL, type, NULL);
>  }
>  EXPORT_SYMBOL(drm_plane_init);
>  
> @@ -224,6 +256,7 @@ void drm_plane_cleanup(struct drm_plane *plane)
>  	drm_modeset_lock_fini(&plane->mutex);
>  
>  	kfree(plane->format_types);
> +	kfree(plane->modifiers);
>  	drm_mode_object_unregister(dev, &plane->base);
>  
>  	BUG_ON(list_empty(&plane->head));
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> index e084f9f8ca66..949f0ab0e267 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -193,6 +193,7 @@ EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);
>   * @funcs: callbacks for the display pipe (optional)
>   * @formats: array of supported formats (DRM_FORMAT\_\*)
>   * @format_count: number of elements in @formats
> + * @format_modifiers: array of formats modifiers
>   * @connector: connector to attach and register (optional)
>   *
>   * Sets up a display pipeline which consist of a really simple
> @@ -213,6 +214,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
>  			struct drm_simple_display_pipe *pipe,
>  			const struct drm_simple_display_pipe_funcs *funcs,
>  			const uint32_t *formats, unsigned int format_count,
> +			const uint64_t *format_modifiers,
>  			struct drm_connector *connector)
>  {
>  	struct drm_encoder *encoder = &pipe->encoder;
> @@ -227,6 +229,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
>  	ret = drm_universal_plane_init(dev, plane, 0,
>  				       &drm_simple_kms_plane_funcs,
>  				       formats, format_count,
> +				       format_modifiers,
>  				       DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret)
>  		return ret;
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
> index c2f17f30afab..75d4928dd196 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
> @@ -284,7 +284,7 @@ int exynos_plane_init(struct drm_device *dev,
>  				       &exynos_plane_funcs,
>  				       config->pixel_formats,
>  				       config->num_pixel_formats,
> -				       config->type, NULL);
> +				       NULL, config->type, NULL);
>  	if (err) {
>  		DRM_ERROR("failed to initialize plane\n");
>  		return err;
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> index 0a20723aa6e1..9554b245746e 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> @@ -224,7 +224,7 @@ struct drm_plane *fsl_dcu_drm_primary_create_plane(struct drm_device *dev)
>  				       &fsl_dcu_drm_plane_funcs,
>  				       fsl_dcu_drm_plane_formats,
>  				       ARRAY_SIZE(fsl_dcu_drm_plane_formats),
> -				       DRM_PLANE_TYPE_PRIMARY, NULL);
> +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret) {
>  		kfree(primary);
>  		primary = NULL;
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> index 59542bddc980..339e914cbaa3 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> @@ -181,6 +181,7 @@ static struct drm_plane *hibmc_plane_init(struct hibmc_drm_private *priv)
>  	ret = drm_universal_plane_init(dev, plane, 1, &hibmc_plane_funcs,
>  				       channel_formats1,
>  				       ARRAY_SIZE(channel_formats1),
> +				       NULL,
>  				       DRM_PLANE_TYPE_PRIMARY,
>  				       NULL);
>  	if (ret) {
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> index c96c228a9898..1acb8af12246 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
> @@ -909,7 +909,7 @@ static int ade_plane_init(struct drm_device *dev, struct ade_plane *aplane,
>  		return ret;
>  
>  	ret = drm_universal_plane_init(dev, &aplane->base, 1, &ade_plane_funcs,
> -				       fmts, fmts_cnt, type, NULL);
> +				       fmts, fmts_cnt, NULL, type, NULL);
>  	if (ret) {
>  		DRM_ERROR("fail to init plane, ch=%d\n", aplane->ch);
>  		return ret;
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 3617927af269..9dd67d51e7c9 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13594,18 +13594,21 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>  		ret = drm_universal_plane_init(&dev_priv->drm, &primary->base,
>  					       0, &intel_plane_funcs,
>  					       intel_primary_formats, num_formats,
> +					       NULL,
>  					       DRM_PLANE_TYPE_PRIMARY,
>  					       "plane 1%c", pipe_name(pipe));
>  	else if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
>  		ret = drm_universal_plane_init(&dev_priv->drm, &primary->base,
>  					       0, &intel_plane_funcs,
>  					       intel_primary_formats, num_formats,
> +					       NULL,
>  					       DRM_PLANE_TYPE_PRIMARY,
>  					       "primary %c", pipe_name(pipe));
>  	else
>  		ret = drm_universal_plane_init(&dev_priv->drm, &primary->base,
>  					       0, &intel_plane_funcs,
>  					       intel_primary_formats, num_formats,
> +					       NULL,
>  					       DRM_PLANE_TYPE_PRIMARY,
>  					       "plane %c", plane_name(primary->plane));
>  	if (ret)
> @@ -13776,7 +13779,7 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>  				       0, &intel_cursor_plane_funcs,
>  				       intel_cursor_formats,
>  				       ARRAY_SIZE(intel_cursor_formats),
> -				       DRM_PLANE_TYPE_CURSOR,
> +				       NULL, DRM_PLANE_TYPE_CURSOR,
>  				       "cursor %c", pipe_name(pipe));
>  	if (ret)
>  		goto fail;
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index f7d431427115..053802dd08c1 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -1165,13 +1165,13 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
>  		ret = drm_universal_plane_init(&dev_priv->drm, &intel_plane->base,
>  					       possible_crtcs, &intel_plane_funcs,
>  					       plane_formats, num_plane_formats,
> -					       DRM_PLANE_TYPE_OVERLAY,
> +					       NULL, DRM_PLANE_TYPE_OVERLAY,
>  					       "plane %d%c", plane + 2, pipe_name(pipe));
>  	else
>  		ret = drm_universal_plane_init(&dev_priv->drm, &intel_plane->base,
>  					       possible_crtcs, &intel_plane_funcs,
>  					       plane_formats, num_plane_formats,
> -					       DRM_PLANE_TYPE_OVERLAY,
> +					       NULL, DRM_PLANE_TYPE_OVERLAY,
>  					       "sprite %c", sprite_name(pipe, plane));
>  	if (ret)
>  		goto fail;
> diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
> index d63e853a0300..6c708c3b1cdc 100644
> --- a/drivers/gpu/drm/imx/ipuv3-plane.c
> +++ b/drivers/gpu/drm/imx/ipuv3-plane.c
> @@ -718,8 +718,8 @@ struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
>  
>  	ret = drm_universal_plane_init(dev, &ipu_plane->base, possible_crtcs,
>  				       &ipu_plane_funcs, ipu_plane_formats,
> -				       ARRAY_SIZE(ipu_plane_formats), type,
> -				       NULL);
> +				       ARRAY_SIZE(ipu_plane_formats),
> +				       NULL, type, NULL);
>  	if (ret) {
>  		DRM_ERROR("failed to initialize plane\n");
>  		kfree(ipu_plane);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index e405e89ed5e5..bec6d14dd070 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -173,7 +173,7 @@ int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
>  
>  	err = drm_universal_plane_init(dev, plane, possible_crtcs,
>  				       &mtk_plane_funcs, formats,
> -				       ARRAY_SIZE(formats), type, NULL);
> +				       ARRAY_SIZE(formats), NULL, type, NULL);
>  	if (err) {
>  		DRM_ERROR("failed to initialize plane\n");
>  		return err;
> diff --git a/drivers/gpu/drm/meson/meson_plane.c b/drivers/gpu/drm/meson/meson_plane.c
> index a32d3b6e2e12..17e96fa47868 100644
> --- a/drivers/gpu/drm/meson/meson_plane.c
> +++ b/drivers/gpu/drm/meson/meson_plane.c
> @@ -223,6 +223,7 @@ int meson_plane_create(struct meson_drm *priv)
>  				 &meson_plane_funcs,
>  				 supported_drm_formats,
>  				 ARRAY_SIZE(supported_drm_formats),
> +				 NULL,
>  				 DRM_PLANE_TYPE_PRIMARY, "meson_primary_plane");
>  
>  	drm_plane_helper_add(plane, &meson_plane_helper_funcs);
> diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_plane.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_plane.c
> index 53619d07677e..8f3417e45d4e 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_plane.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_plane.c
> @@ -398,7 +398,7 @@ struct drm_plane *mdp4_plane_init(struct drm_device *dev,
>  	type = private_plane ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
>  	ret = drm_universal_plane_init(dev, plane, 0xff, &mdp4_plane_funcs,
>  				 mdp4_plane->formats, mdp4_plane->nformats,
> -				 type, NULL);
> +				 NULL, type, NULL);
>  	if (ret)
>  		goto fail;
>  
> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
> index a38c5fe6cc19..a815bc0e78d1 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c
> @@ -1140,12 +1140,12 @@ struct drm_plane *mdp5_plane_init(struct drm_device *dev,
>  		ret = drm_universal_plane_init(dev, plane, 0xff,
>  				&mdp5_cursor_plane_funcs,
>  				mdp5_plane->formats, mdp5_plane->nformats,
> -				type, NULL);
> +				NULL, type, NULL);
>  	else
>  		ret = drm_universal_plane_init(dev, plane, 0xff,
>  				&mdp5_plane_funcs,
>  				mdp5_plane->formats, mdp5_plane->nformats,
> -				type, NULL);
> +				NULL, type, NULL);
>  	if (ret)
>  		goto fail;
>  
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index d1b9c34c7c00..3ee3784a54f4 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -190,7 +190,7 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags)
>  	}
>  
>  	ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
> -			mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
> +			mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL, 0,
>  			&mxsfb->connector);
>  	if (ret < 0) {
>  		dev_err(drm->dev, "Cannot setup simple display pipe\n");
> diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
> index 0e58537352fe..dde71be463f8 100644
> --- a/drivers/gpu/drm/nouveau/nv50_display.c
> +++ b/drivers/gpu/drm/nouveau/nv50_display.c
> @@ -1084,8 +1084,9 @@ nv50_wndw_ctor(const struct nv50_wndw_func *func, struct drm_device *dev,
>  	wndw->func = func;
>  	wndw->dmac = dmac;
>  
> -	ret = drm_universal_plane_init(dev, &wndw->plane, 0, &nv50_wndw, format,
> -				       nformat, type, "%s-%d", name, index);
> +	ret = drm_universal_plane_init(dev, &wndw->plane, 0, &nv50_wndw,
> +				       format, nformat, NULL,
> +				       type, "%s-%d", name, index);
>  	if (ret)
>  		return ret;
>  
> diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
> index 9168154d749e..9b8341d77468 100644
> --- a/drivers/gpu/drm/omapdrm/omap_plane.c
> +++ b/drivers/gpu/drm/omapdrm/omap_plane.c
> @@ -370,7 +370,8 @@ struct drm_plane *omap_plane_init(struct drm_device *dev,
>  
>  	ret = drm_universal_plane_init(dev, plane, possible_crtcs,
>  				       &omap_plane_funcs, omap_plane->formats,
> -				       omap_plane->nformats, type, NULL);
> +				       omap_plane->nformats,
> +				       NULL, type, NULL);
>  	if (ret < 0)
>  		goto error;
>  
> diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
> index 058340a002c2..fcf1d2034449 100644
> --- a/drivers/gpu/drm/qxl/qxl_display.c
> +++ b/drivers/gpu/drm/qxl/qxl_display.c
> @@ -788,7 +788,7 @@ static struct drm_plane *qxl_create_plane(struct qxl_device *qdev,
>  
>  	err = drm_universal_plane_init(&qdev->ddev, plane, possible_crtcs,
>  				       funcs, formats, num_formats,
> -				       type, NULL);
> +				       NULL, type, NULL);
>  	if (err)
>  		goto free_plane;
>  
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> index dcde6288da6c..2b02eccbfb70 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> @@ -743,8 +743,8 @@ int rcar_du_planes_init(struct rcar_du_group *rgrp)
>  
>  		ret = drm_universal_plane_init(rcdu->ddev, &plane->plane, crtcs,
>  					       &rcar_du_plane_funcs, formats,
> -					       ARRAY_SIZE(formats), type,
> -					       NULL);
> +					       ARRAY_SIZE(formats),
> +					       NULL, type, NULL);
>  		if (ret < 0)
>  			return ret;
>  
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> index b0ff304ce3dc..e0c054f9b57a 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> @@ -368,8 +368,8 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp)
>  					       1 << vsp->index,
>  					       &rcar_du_vsp_plane_funcs,
>  					       formats_kms,
> -					       ARRAY_SIZE(formats_kms), type,
> -					       NULL);
> +					       ARRAY_SIZE(formats_kms),
> +					       NULL, type, NULL);
>  		if (ret < 0)
>  			return ret;
>  
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 3f7a82d1e095..d0cf57de9afc 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -1280,7 +1280,7 @@ static int vop_create_crtc(struct vop *vop)
>  					       0, &vop_plane_funcs,
>  					       win_data->phy->data_formats,
>  					       win_data->phy->nformats,
> -					       win_data->type, NULL);
> +					       NULL, win_data->type, NULL);
>  		if (ret) {
>  			DRM_DEV_ERROR(vop->dev, "failed to init plane %d\n",
>  				      ret);
> @@ -1319,7 +1319,7 @@ static int vop_create_crtc(struct vop *vop)
>  					       &vop_plane_funcs,
>  					       win_data->phy->data_formats,
>  					       win_data->phy->nformats,
> -					       win_data->type, NULL);
> +					       NULL, win_data->type, NULL);
>  		if (ret) {
>  			DRM_DEV_ERROR(vop->dev, "failed to init overlay %d\n",
>  				      ret);
> diff --git a/drivers/gpu/drm/sti/sti_cursor.c b/drivers/gpu/drm/sti/sti_cursor.c
> index cca75bddb9ad..97c25e204bf4 100644
> --- a/drivers/gpu/drm/sti/sti_cursor.c
> +++ b/drivers/gpu/drm/sti/sti_cursor.c
> @@ -393,7 +393,7 @@ struct drm_plane *sti_cursor_create(struct drm_device *drm_dev,
>  				       &sti_cursor_plane_helpers_funcs,
>  				       cursor_supported_formats,
>  				       ARRAY_SIZE(cursor_supported_formats),
> -				       DRM_PLANE_TYPE_CURSOR, NULL);
> +				       NULL, DRM_PLANE_TYPE_CURSOR, NULL);
>  	if (res) {
>  		DRM_ERROR("Failed to initialize universal plane\n");
>  		goto err_plane;
> diff --git a/drivers/gpu/drm/sti/sti_gdp.c b/drivers/gpu/drm/sti/sti_gdp.c
> index 88f16cdf6a4b..70391603c12d 100644
> --- a/drivers/gpu/drm/sti/sti_gdp.c
> +++ b/drivers/gpu/drm/sti/sti_gdp.c
> @@ -932,7 +932,7 @@ struct drm_plane *sti_gdp_create(struct drm_device *drm_dev,
>  				       &sti_gdp_plane_helpers_funcs,
>  				       gdp_supported_formats,
>  				       ARRAY_SIZE(gdp_supported_formats),
> -				       type, NULL);
> +				       NULL, type, NULL);
>  	if (res) {
>  		DRM_ERROR("Failed to initialize universal plane\n");
>  		goto err;
> diff --git a/drivers/gpu/drm/sti/sti_hqvdp.c b/drivers/gpu/drm/sti/sti_hqvdp.c
> index 66f843148ef7..9a1ff352820d 100644
> --- a/drivers/gpu/drm/sti/sti_hqvdp.c
> +++ b/drivers/gpu/drm/sti/sti_hqvdp.c
> @@ -1296,7 +1296,7 @@ static struct drm_plane *sti_hqvdp_create(struct drm_device *drm_dev,
>  				       &sti_hqvdp_plane_helpers_funcs,
>  				       hqvdp_supported_formats,
>  				       ARRAY_SIZE(hqvdp_supported_formats),
> -				       DRM_PLANE_TYPE_OVERLAY, NULL);
> +				       NULL, DRM_PLANE_TYPE_OVERLAY, NULL);
>  	if (res) {
>  		DRM_ERROR("Failed to initialize universal plane\n");
>  		return NULL;
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
> index f26bde5b9117..2d9f8d01ac2e 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> @@ -115,7 +115,7 @@ static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
>  	ret = drm_universal_plane_init(drm, &layer->plane, 0,
>  				       &sun4i_backend_layer_funcs,
>  				       plane->formats, plane->nformats,
> -				       plane->type, NULL);
> +				       NULL, plane->type, NULL);
>  	if (ret) {
>  		dev_err(drm->dev, "Couldn't initialize layer\n");
>  		return ERR_PTR(ret);
> diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> index 95b373f739f2..0380edd054ac 100644
> --- a/drivers/gpu/drm/tegra/dc.c
> +++ b/drivers/gpu/drm/tegra/dc.c
> @@ -655,8 +655,8 @@ static struct drm_plane *tegra_dc_primary_plane_create(struct drm_device *drm,
>  
>  	err = drm_universal_plane_init(drm, &plane->base, possible_crtcs,
>  				       &tegra_primary_plane_funcs, formats,
> -				       num_formats, DRM_PLANE_TYPE_PRIMARY,
> -				       NULL);
> +				       num_formats, NULL,
> +				       DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (err < 0) {
>  		kfree(plane);
>  		return ERR_PTR(err);
> @@ -821,8 +821,8 @@ static struct drm_plane *tegra_dc_cursor_plane_create(struct drm_device *drm,
>  
>  	err = drm_universal_plane_init(drm, &plane->base, 1 << dc->pipe,
>  				       &tegra_cursor_plane_funcs, formats,
> -				       num_formats, DRM_PLANE_TYPE_CURSOR,
> -				       NULL);
> +				       num_formats, NULL,
> +				       DRM_PLANE_TYPE_CURSOR, NULL);
>  	if (err < 0) {
>  		kfree(plane);
>  		return ERR_PTR(err);
> @@ -883,8 +883,8 @@ static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm,
>  
>  	err = drm_universal_plane_init(drm, &plane->base, 1 << dc->pipe,
>  				       &tegra_overlay_plane_funcs, formats,
> -				       num_formats, DRM_PLANE_TYPE_OVERLAY,
> -				       NULL);
> +				       num_formats, NULL,
> +				       DRM_PLANE_TYPE_OVERLAY, NULL);
>  	if (err < 0) {
>  		kfree(plane);
>  		return ERR_PTR(err);
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index d34cd5393a9b..74b5e7afd6e9 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -861,7 +861,7 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
>  	ret = drm_universal_plane_init(dev, plane, 0,
>  				       &vc4_plane_funcs,
>  				       formats, num_formats,
> -				       type, NULL);
> +				       NULL, type, NULL);
>  
>  	drm_plane_helper_add(plane, &vc4_plane_helper_funcs);
>  
> diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
> index adcdbd0abef6..71ba455af915 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_plane.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
> @@ -298,7 +298,7 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
>  	ret = drm_universal_plane_init(dev, plane, 1 << index,
>  				       &virtio_gpu_plane_funcs,
>  				       formats, nformats,
> -				       type, NULL);
> +				       NULL, type, NULL);
>  	if (ret)
>  		goto err_plane_init;
>  
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
> index d3987bcf53f8..6f0bf6f9c6f8 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
> @@ -439,7 +439,7 @@ static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
>  				       0, &vmw_ldu_plane_funcs,
>  				       vmw_primary_plane_formats,
>  				       ARRAY_SIZE(vmw_primary_plane_formats),
> -				       DRM_PLANE_TYPE_PRIMARY, NULL);
> +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret) {
>  		DRM_ERROR("Failed to initialize primary plane");
>  		goto err_free;
> @@ -454,7 +454,7 @@ static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
>  			0, &vmw_ldu_cursor_funcs,
>  			vmw_cursor_plane_formats,
>  			ARRAY_SIZE(vmw_cursor_plane_formats),
> -			DRM_PLANE_TYPE_CURSOR, NULL);
> +			NULL, DRM_PLANE_TYPE_CURSOR, NULL);
>  	if (ret) {
>  		DRM_ERROR("Failed to initialize cursor plane");
>  		drm_plane_cleanup(&ldu->base.primary);
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
> index 8d7dc9def7c2..42780c9cb90f 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
> @@ -622,7 +622,7 @@ static int vmw_sou_init(struct vmw_private *dev_priv, unsigned unit)
>  				       0, &vmw_sou_plane_funcs,
>  				       vmw_primary_plane_formats,
>  				       ARRAY_SIZE(vmw_primary_plane_formats),
> -				       DRM_PLANE_TYPE_PRIMARY, NULL);
> +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret) {
>  		DRM_ERROR("Failed to initialize primary plane");
>  		goto err_free;
> @@ -637,7 +637,7 @@ static int vmw_sou_init(struct vmw_private *dev_priv, unsigned unit)
>  			0, &vmw_sou_cursor_funcs,
>  			vmw_cursor_plane_formats,
>  			ARRAY_SIZE(vmw_cursor_plane_formats),
> -			DRM_PLANE_TYPE_CURSOR, NULL);
> +			NULL, DRM_PLANE_TYPE_CURSOR, NULL);
>  	if (ret) {
>  		DRM_ERROR("Failed to initialize cursor plane");
>  		drm_plane_cleanup(&sou->base.primary);
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> index bad31bdf09b6..f18fb966ce9c 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> @@ -1456,7 +1456,7 @@ static int vmw_stdu_init(struct vmw_private *dev_priv, unsigned unit)
>  				       0, &vmw_stdu_plane_funcs,
>  				       vmw_primary_plane_formats,
>  				       ARRAY_SIZE(vmw_primary_plane_formats),
> -				       DRM_PLANE_TYPE_PRIMARY, NULL);
> +				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
>  	if (ret) {
>  		DRM_ERROR("Failed to initialize primary plane");
>  		goto err_free;
> @@ -1471,7 +1471,7 @@ static int vmw_stdu_init(struct vmw_private *dev_priv, unsigned unit)
>  			0, &vmw_stdu_cursor_funcs,
>  			vmw_cursor_plane_formats,
>  			ARRAY_SIZE(vmw_cursor_plane_formats),
> -			DRM_PLANE_TYPE_CURSOR, NULL);
> +			NULL, DRM_PLANE_TYPE_CURSOR, NULL);
>  	if (ret) {
>  		DRM_ERROR("Failed to initialize cursor plane");
>  		drm_plane_cleanup(&stdu->base.primary);
> diff --git a/drivers/gpu/drm/zte/zx_plane.c b/drivers/gpu/drm/zte/zx_plane.c
> index d646ac931663..ea29fee01f7d 100644
> --- a/drivers/gpu/drm/zte/zx_plane.c
> +++ b/drivers/gpu/drm/zte/zx_plane.c
> @@ -539,7 +539,7 @@ int zx_plane_init(struct drm_device *drm, struct zx_plane *zplane,
>  
>  	ret = drm_universal_plane_init(drm, plane, VOU_CRTC_MASK,
>  				       &zx_plane_funcs, formats, format_count,
> -				       type, NULL);
> +				       NULL, type, NULL);
>  	if (ret) {
>  		DRM_DEV_ERROR(dev, "failed to init universal plane: %d\n", ret);
>  		return ret;
> diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
> index 9ab3e7044812..2db5eed53d7b 100644
> --- a/include/drm/drm_plane.h
> +++ b/include/drm/drm_plane.h
> @@ -392,6 +392,20 @@ struct drm_plane_funcs {
>  	 */
>  	void (*atomic_print_state)(struct drm_printer *p,
>  				   const struct drm_plane_state *state);
> +
> +	/**
> +	 * @format_mod_supported:
> +	 *
> +	 * This optional hook is used for the DRM to determine if the given
> +	 * format/modifier combination is valid for the plane. This allows the
> +	 * DRM to generate the correct format bitmask (which formats apply to
> +	 * which modifier).
> +	 *

Add a "Returns:" line here in the comment to match the style of the file's comments.

> +	 * True if the given modifier is valid for that format on the plane.
> +	 * False otherwise.
> +	 */
> +	bool (*format_mod_supported)(struct drm_plane *plane, uint32_t format,
> +				     uint64_t modifier);
>  };
>  
>  /**
> @@ -487,6 +501,9 @@ struct drm_plane {
>  	unsigned int format_count;
>  	bool format_default;
>  
> +	uint64_t *modifiers;
> +	unsigned int modifier_count;
> +
>  	struct drm_crtc *crtc;
>  	struct drm_framebuffer *fb;
>  
> @@ -527,13 +544,14 @@ struct drm_plane {
>  
>  #define obj_to_plane(x) container_of(x, struct drm_plane, base)
>  
> -__printf(8, 9)
> +__printf(9, 10)
>  int drm_universal_plane_init(struct drm_device *dev,
>  			     struct drm_plane *plane,
>  			     uint32_t possible_crtcs,
>  			     const struct drm_plane_funcs *funcs,
>  			     const uint32_t *formats,
>  			     unsigned int format_count,
> +			     const uint64_t *format_modifiers,
>  			     enum drm_plane_type type,
>  			     const char *name, ...);
>  int drm_plane_init(struct drm_device *dev,
> diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
> index 2d36538e4a17..6d9adbb46293 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -122,6 +122,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
>  			struct drm_simple_display_pipe *pipe,
>  			const struct drm_simple_display_pipe_funcs *funcs,
>  			const uint32_t *formats, unsigned int format_count,
> +			const uint64_t *format_modifiers,
>  			struct drm_connector *connector);
>  
>  #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 55e301047b3e..47f0175e29c0 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -184,6 +184,8 @@ extern "C" {
>  #define DRM_FORMAT_MOD_VENDOR_VIVANTE 0x06
>  /* add more to the end as needed */
>  
> +#define DRM_FORMAT_RESERVED	      ((1ULL << 56) - 1)
> +
>  #define fourcc_mod_code(vendor, val) \
>  	((((__u64)DRM_FORMAT_MOD_VENDOR_## vendor) << 56) | (val & 0x00ffffffffffffffULL))
>  
> @@ -196,6 +198,15 @@ extern "C" {
>   */
>  
>  /*
> + * Invalid Modifier
> + *
> + * This modifier can be used as a sentinel to terminate list, or to initialize a

s/terminate list/terminate the format modifiers list/



> + * variable with an invalid modifier. It might also be used to report an error
> + * back to userspace for certain APIs.
> + */
> +#define DRM_FORMAT_MOD_INVALID	fourcc_mod_code(NONE, DRM_FORMAT_RESERVED)
> +
> +/*
>   * Linear Layout
>   *
>   * Just plain linear layout. Note that this is different from no specifying any
> -- 
> 2.13.0
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯


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