drm: atmel-hlcdc: add vertical and horizontal scaling support for XLCDC

Update the vertical and horizontal scaler registers of XLCDC IP
with Bilinear and Bicubic co-efficients taps for Chroma and
Luma componenets of the Pixel.

Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240424053351.589830-7-manikandan.m@microchip.com

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h

@@ -198,6 +198,8 @@
  * @disc_pos: discard area position register
  * @disc_size: discard area size register
  * @csc: color space conversion register
+ * @vxs_config: vertical scalar filter taps control register
+ * @hxs_config: horizontal scalar filter taps control register
  */
 struct atmel_hlcdc_layer_cfg_layout {
 	int xstride[ATMEL_HLCDC_LAYER_MAX_PLANES];
@@ -217,6 +219,8 @@ struct atmel_hlcdc_layer_cfg_layout {
 	int disc_pos;
 	int disc_size;
 	int csc;
+	int vxs_config;
+	int hxs_config;
 };
 
 /**

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c

@@ -966,6 +966,26 @@ static void atmel_xlcdc_csc_init(struct atmel_hlcdc_plane *plane,
 					    desc->layout.csc + i,
 					    xlcdc_csc_coeffs[i]);
 	}
+
+	if (desc->layout.vxs_config && desc->layout.hxs_config) {
+		/*
+		 * Updating vxs.config and hxs.config fixes the
+		 * Green Color Issue in SAM9X7 EGT Video Player App
+		 */
+		atmel_hlcdc_layer_write_cfg(&plane->layer,
+					    desc->layout.vxs_config,
+					    ATMEL_XLCDC_LAYER_VXSYCFG_ONE |
+					    ATMEL_XLCDC_LAYER_VXSYTAP2_ENABLE |
+					    ATMEL_XLCDC_LAYER_VXSCCFG_ONE |
+					    ATMEL_XLCDC_LAYER_VXSCTAP2_ENABLE);
+
+		atmel_hlcdc_layer_write_cfg(&plane->layer,
+					    desc->layout.hxs_config,
+					    ATMEL_XLCDC_LAYER_HXSYCFG_ONE |
+					    ATMEL_XLCDC_LAYER_HXSYTAP2_ENABLE |
+					    ATMEL_XLCDC_LAYER_HXSCCFG_ONE |
+					    ATMEL_XLCDC_LAYER_HXSCTAP2_ENABLE);
+	}
 }
 
 static int atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane)