drm/sun4i: Expand DE2 scaler lib with YUV support

Basic principle of operation when using YUV framebuffer is that chroma
planes have to be upscaled to same size as luma.

Because of that, expand DE2 scaler library to support that.

BSP driver uses another set of FIR filter coefficients for YUV planes.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171201060550.10392-26-jernej.skrabec@siol.net

drivers/gpu/drm/sun4i/sun8i_vi_layer.c

@@ -51,6 +51,7 @@ static int sun8i_vi_layer_update_coord(struct sun8i_mixer *mixer, int channel,
 				       int overlay, struct drm_plane *plane)
 {
 	struct drm_plane_state *state = plane->state;
+	const struct drm_format_info *format = state->fb->format;
 	u32 src_w, src_h, dst_w, dst_h;
 	u32 outsize, insize;
 	u32 hphase, vphase;
@@ -89,7 +90,8 @@ static int sun8i_vi_layer_update_coord(struct sun8i_mixer *mixer, int channel,
 		vscale = state->src_h / state->crtc_h;
 
 		sun8i_vi_scaler_setup(mixer, channel, src_w, src_h, dst_w,
-				      dst_h, hscale, vscale, hphase, vphase);
+				      dst_h, hscale, vscale, hphase, vphase,
+				      format);
 		sun8i_vi_scaler_enable(mixer, channel, true);
 	} else {
 		DRM_DEBUG_DRIVER("HW scaling is not needed\n");

drivers/gpu/drm/sun4i/sun8i_vi_scaler.h

@@ -9,6 +9,7 @@
 #ifndef _SUN8I_VI_SCALER_H_
 #define _SUN8I_VI_SCALER_H_
 
+#include <drm/drm_fourcc.h>
 #include "sun8i_mixer.h"
 
 /* this two macros assumes 16 fractional bits which is standard in DRM */
@@ -51,6 +52,7 @@
 void sun8i_vi_scaler_enable(struct sun8i_mixer *mixer, int layer, bool enable);
 void sun8i_vi_scaler_setup(struct sun8i_mixer *mixer, int layer,
 			   u32 src_w, u32 src_h, u32 dst_w, u32 dst_h,
-			   u32 hscale, u32 vscale, u32 hphase, u32 vphase);
+			   u32 hscale, u32 vscale, u32 hphase, u32 vphase,
+			   const struct drm_format_info *format);
 
 #endif