Re: [RFC PATCH v2] drm/arm/malidp: Added support for AFBC modifiers for all layers except DE_SMART

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Jul 05, 2018 at 03:25:43PM +0100, Ayan Kumar Halder wrote:
> On planes which support AFBC, expose an AFBC modifier for use with BGR888.
> 
> Signed-off-by: Ayan Kumar halder <ayan.halder@arm.com>
> Reviewed-by: Brian Starkey <brian.starkey@arm.com>
> Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
> 
> Changes from v2:
> - Removed the gerrit change-id
> - Replaced DRM_ERROR() with DRM_DEBUG_KMS() in malidp_format_mod_supported()
> to report unsupported modifiers.
> ---
>  drivers/gpu/drm/arm/malidp_drv.c    |  1 +
>  drivers/gpu/drm/arm/malidp_planes.c | 46 +++++++++++++++++++++++++++++++++++--
>  2 files changed, 45 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index 7b6a848..7bcd679 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -392,6 +392,7 @@ static int malidp_init(struct drm_device *drm)
>  	drm->mode_config.max_height = hwdev->max_line_size;
>  	drm->mode_config.funcs = &malidp_mode_config_funcs;
>  	drm->mode_config.helper_private = &malidp_mode_config_helpers;
> +	drm->mode_config.allow_fb_modifiers = true;
>  
>  	ret = malidp_crtc_init(drm);
>  	if (ret) {
> diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
> index 3950504..914cc58 100644
> --- a/drivers/gpu/drm/arm/malidp_planes.c
> +++ b/drivers/gpu/drm/arm/malidp_planes.c
> @@ -124,6 +124,35 @@ static void malidp_plane_atomic_print_state(struct drm_printer *p,
>  	drm_printf(p, "\tn_planes=%u\n", ms->n_planes);
>  }
>  
> +static bool malidp_format_mod_supported(struct drm_plane *plane,
> +					u32 format, u64 modifier)
> +{
> +	if (WARN_ON(modifier == DRM_FORMAT_MOD_INVALID))
> +		return false;
> +
> +	/* All the pixel formats are supported without any modifier */
> +	if (modifier == DRM_FORMAT_MOD_LINEAR)
> +		return true;
> +
> +	if ((modifier >> 56) != DRM_FORMAT_MOD_VENDOR_ARM)
> +		return false;
> +
> +	if (modifier &
> +	    ~DRM_FORMAT_MOD_ARM_AFBC(AFBC_MOD_VALID_BITS)) {
> +		DRM_DEBUG_KMS("Unsupported modifiers\n");
> +		return false;
> +	}

I think the core checks for that by now, or at least Ville had some
patches to make that happen ...

I also don't see the ARM_AFBC modifier in upstream yet, is that still
in-flight somewhere?
-Daniel

> +
> +	switch (modifier) {
> +	case DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 |
> +				AFBC_FORMAT_MOD_YTR |
> +				AFBC_FORMAT_MOD_SPARSE):
> +		if (format == DRM_FORMAT_BGR888)
> +			return true;
> +	}
> +	return false;
> +}
> +
>  static const struct drm_plane_funcs malidp_de_plane_funcs = {
>  	.update_plane = drm_atomic_helper_update_plane,
>  	.disable_plane = drm_atomic_helper_disable_plane,
> @@ -132,6 +161,7 @@ static const struct drm_plane_funcs malidp_de_plane_funcs = {
>  	.atomic_duplicate_state = malidp_duplicate_plane_state,
>  	.atomic_destroy_state = malidp_destroy_plane_state,
>  	.atomic_print_state = malidp_plane_atomic_print_state,
> +	.format_mod_supported = malidp_format_mod_supported,
>  };
>  
>  static int malidp_se_check_scaling(struct malidp_plane *mp,
> @@ -524,6 +554,13 @@ int malidp_de_planes_init(struct drm_device *drm)
>  	u32 *formats;
>  	int ret, i, j, n;
>  
> +	static const u64 modifiers[] = {
> +		DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 |
> +			AFBC_FORMAT_MOD_YTR | AFBC_FORMAT_MOD_SPARSE),
> +		DRM_FORMAT_MOD_LINEAR,
> +		DRM_FORMAT_MOD_INVALID
> +	};
> +
>  	formats = kcalloc(map->n_pixel_formats, sizeof(*formats), GFP_KERNEL);
>  	if (!formats) {
>  		ret = -ENOMEM;
> @@ -547,9 +584,14 @@ int malidp_de_planes_init(struct drm_device *drm)
>  
>  		plane_type = (i == 0) ? DRM_PLANE_TYPE_PRIMARY :
>  					DRM_PLANE_TYPE_OVERLAY;
> +
> +		/*
> +		 * All the layers except smart layer supports AFBC modifiers.
> +		 */
>  		ret = drm_universal_plane_init(drm, &plane->base, crtcs,
> -					       &malidp_de_plane_funcs, formats,
> -					       n, NULL, plane_type, NULL);
> +				&malidp_de_plane_funcs, formats, n,
> +				(id == DE_SMART) ? NULL : modifiers, plane_type, NULL);
> +
>  		if (ret < 0)
>  			goto cleanup;
>  
> -- 
> 2.7.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch