[PATCH v4 7/8] drm: atmel-hlcdc: add vertical and horizontal scaling support for XLCDC

[Manikandan Muralidharan]

update the LCDC_HEOCFG30 and LCDC_HEOCFG31 registers of XLCDC IP which
supports vertical and horizontal scaling with Bilinear and Bicubic
co-efficients taps for Chroma and Luma componenets of the Pixel.

Signed-off-by: Manikandan Muralidharan <manikanda...@microchip.com>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c  |  2 ++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h  |  4 ++++
 .../gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c   | 20 +++++++++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c 
b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index d30aec174aa2..ae3e1a813482 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -536,6 +536,8 @@ static const struct atmel_hlcdc_layer_desc 
atmel_xlcdc_sam9x75_layers[] = {
                        .general_config = 12,
                        .csc = 16,
                        .scaler_config = 23,
+                       .vxs_config = 30,
+                       .hxs_config = 31,
                },
                .clut_offset = 0x1300,
        },
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h 
b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
index 8b05a54b5fd0..27074a4c5aec 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
+++ b/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;
 };
 
 /**
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c 
b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
index 26caf4cddfa4..a06ae2dc5909 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -972,6 +972,26 @@ static void xlcdc_csc_init(struct atmel_hlcdc_plane *plane,
                atmel_hlcdc_layer_write_cfg(&plane->layer,
                                            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)
-- 
2.25.1