linux-kernel - [PATCH v9 6/8] drm: atmel-hlcdc: add vertical and horizontal scaling support for XLCDC

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Date: Fri, 1 Mar 2024 10:55:32 +0530
From: Manikandan Muralidharan <manikandan.m@...rochip.com>
To: <sam@...nborg.org>, <bbrezillon@...nel.org>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>, <lee@...nel.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: <Hari.PrasathGE@...rochip.com>, <Balamanikandan.Gunasundar@...rochip.com>,
	<Durai.ManickamKR@...rochip.com>, <Nayabbasha.Sayed@...rochip.com>,
	<Dharma.B@...rochip.com>, <Varshini.Rajendran@...rochip.com>,
	<Balakrishnan.S@...rochip.com>, <Charan.Pedumuru@...rochip.com>, "Manikandan
 Muralidharan" <manikandan.m@...rochip.com>
Subject: [PATCH v9 6/8] 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@...rochip.com>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h  |  4 ++++
 .../gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c   | 20 +++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
index 1153d402f810..e1a0bb24b511 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 8a5419ccc343..55ce4b2fcb88 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/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)
-- 
2.25.1