Re: [PATCH 4/5] drm/vc4: Move ->offsets[] adjustment out of setup_clipping_and_scaling()

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Wed, 25 Jul 2018 17:32:08 +0200
Boris Brezillon <boris.brezillon@bootlin.com> wrote:

> From: Eric Anholt <eric@anholt.net>
> 
> The offset adjustment depends on the framebuffer modified, so let's

						   ^ modifier

> just move this operation in the DRM_FORMAT_MOD_LINEAR case inside
> vc4_plane_mode_set().
> 
> This we'll be able to fix offset calculation for

^ Thanks to this, we'll ...

> DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED and DRM_FORMAT_MOD_BROADCOM_SANDXXX.
> 
> Signed-off-by: Eric Anholt <eric@anholt.net>
> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
> ---
>  drivers/gpu/drm/vc4/vc4_plane.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 39e1fa3a8466..2b8ba1c412be 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -354,14 +354,6 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
>  		vc4_state->y_scaling[1] = VC4_SCALING_NONE;
>  	}
>  
> -	/* Adjust the base pointer to the first pixel to be scanned out. */
> -	for (i = 0; i < num_planes; i++) {
> -		vc4_state->offsets[i] += (src_y / (i ? v_subsample : 1)) *
> -					 fb->pitches[i];
> -		vc4_state->offsets[i] += (src_x / (i ? h_subsample : 1)) *
> -					 fb->format->cpp[i];
> -	}
> -
>  	return 0;
>  }
>  
> @@ -476,6 +468,7 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
>  	u64 base_format_mod = fourcc_mod_broadcom_mod(fb->modifier);
>  	int num_planes = drm_format_num_planes(format->drm);
>  	u32 src_x, src_y, crtc_h, crtc_w, src_h, src_w;
> +	u32 h_subsample, v_subsample;
>  	bool mix_plane_alpha;
>  	bool covers_screen;
>  	u32 scl0, scl1, pitch0;
> @@ -527,11 +520,25 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
>  	src_y = state->src.y1 >> 16;
>  	src_w = (state->src.x2 - state->src.x1) >> 16;
>  	src_h = (state->src.y2 - state->src.y1) >> 16;
> +	h_subsample = drm_format_horz_chroma_subsampling(format->drm);
> +	v_subsample = drm_format_vert_chroma_subsampling(format->drm);
>  
>  	switch (base_format_mod) {
>  	case DRM_FORMAT_MOD_LINEAR:
>  		tiling = SCALER_CTL0_TILING_LINEAR;
>  		pitch0 = VC4_SET_FIELD(fb->pitches[0], SCALER_SRC_PITCH);
> +
> +		/* Adjust the base pointer to the first pixel to be scanned
> +		 * out.
> +		 */
> +		for (i = 0; i < num_planes; i++) {
> +			vc4_state->offsets[i] += src_y /
> +						 (i ? v_subsample : 1) *
> +						 fb->pitches[i];
> +			vc4_state->offsets[i] += src_x /
> +						 (i ? h_subsample : 1) *
> +						 fb->format->cpp[i];
> +		}
>  		break;
>  
>  	case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED: {

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