linux-kernel - [PATCH v3 06/33] media: atmel: atmel-isc: extract CSC submodule config into separate function

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Message-ID: <20210413105731.610028-7-eugen.hristev@microchip.com>
Date:   Tue, 13 Apr 2021 13:57:04 +0300
From:   Eugen Hristev <eugen.hristev@...rochip.com>
To:     <devicetree@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <jacopo@...ndi.org>, <robh+dt@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Eugen Hristev <eugen.hristev@...rochip.com>
Subject: [PATCH v3 06/33] media: atmel: atmel-isc: extract CSC submodule config into separate function

The CSC submodule is a part of the atmel-isc pipeline, and stands for
Color Space Conversion. It is used to apply a matrix transformation to
RGB pixels to convert them to the YUV components.
The CSC submodule should be initialized in the product specific driver
as it's product specific. Other products can implement it differently.

Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
Changes in v3:
- added explanation regarding CSC acronym
Changes in v2:
- addded function prototype to avoid warning with W=1

 drivers/media/platform/atmel/atmel-isc-base.c   |  8 +-------
 drivers/media/platform/atmel/atmel-isc.h        |  7 +++++++
 .../media/platform/atmel/atmel-sama5d2-isc.c    | 17 +++++++++++++++++
 3 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
index ff40ee2e2759..31f63ba90c71 100644
--- a/drivers/media/platform/atmel/atmel-isc-base.c
+++ b/drivers/media/platform/atmel/atmel-isc-base.c
@@ -646,13 +646,7 @@ static void isc_set_pipeline(struct isc_device *isc, u32 pipeline)
 	regmap_bulk_write(regmap, ISC_GAM_GENTRY, gamma, GAMMA_ENTRIES);
 	regmap_bulk_write(regmap, ISC_GAM_RENTRY, gamma, GAMMA_ENTRIES);
 
-	/* Convert RGB to YUV */
-	regmap_write(regmap, ISC_CSC_YR_YG, 0x42 | (0x81 << 16));
-	regmap_write(regmap, ISC_CSC_YB_OY, 0x19 | (0x10 << 16));
-	regmap_write(regmap, ISC_CSC_CBR_CBG, 0xFDA | (0xFB6 << 16));
-	regmap_write(regmap, ISC_CSC_CBB_OCB, 0x70 | (0x80 << 16));
-	regmap_write(regmap, ISC_CSC_CRR_CRG, 0x70 | (0xFA2 << 16));
-	regmap_write(regmap, ISC_CSC_CRB_OCR, 0xFEE | (0x80 << 16));
+	isc->config_csc(isc);
 
 	regmap_write(regmap, ISC_CBC_BRIGHT, ctrls->brightness);
 	regmap_write(regmap, ISC_CBC_CONTRAST, ctrls->contrast);
diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
index d14ae096fbf6..bb0b4419deff 100644
--- a/drivers/media/platform/atmel/atmel-isc.h
+++ b/drivers/media/platform/atmel/atmel-isc.h
@@ -192,6 +192,9 @@ struct isc_ctrls {
  *
  * @max_width:		maximum frame width, dependent on the internal RAM
  * @max_height:		maximum frame height, dependent on the internal RAM
+ *
+ * @config_csc:		pointer to a function that initializes product
+ *			specific CSC module
  */
 struct isc_device {
 	struct regmap		*regmap;
@@ -259,6 +262,10 @@ struct isc_device {
 
 	u32		max_width;
 	u32		max_height;
+
+	struct {
+		void (*config_csc)(struct isc_device *isc);
+	};
 };
 
 extern struct isc_format formats_list[];
diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
index 6d9942dcd7c1..f041bd75090e 100644
--- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
+++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
@@ -54,6 +54,21 @@
 
 #define ISC_CLK_MAX_DIV		255
 
+void isc_sama5d2_config_csc(struct isc_device *isc);
+
+void isc_sama5d2_config_csc(struct isc_device *isc)
+{
+	struct regmap *regmap = isc->regmap;
+
+	/* Convert RGB to YUV */
+	regmap_write(regmap, ISC_CSC_YR_YG, 0x42 | (0x81 << 16));
+	regmap_write(regmap, ISC_CSC_YB_OY, 0x19 | (0x10 << 16));
+	regmap_write(regmap, ISC_CSC_CBR_CBG, 0xFDA | (0xFB6 << 16));
+	regmap_write(regmap, ISC_CSC_CBB_OCB, 0x70 | (0x80 << 16));
+	regmap_write(regmap, ISC_CSC_CRR_CRG, 0x70 | (0xFA2 << 16));
+	regmap_write(regmap, ISC_CSC_CRB_OCR, 0xFEE | (0x80 << 16));
+}
+
 /* Gamma table with gamma 1/2.2 */
 const u32 isc_sama5d2_gamma_table[][GAMMA_ENTRIES] = {
 	/* 0 --> gamma 1/1.8 */
@@ -198,6 +213,8 @@ static int atmel_isc_probe(struct platform_device *pdev)
 	isc->max_width = ISC_SAMA5D2_MAX_SUPPORT_WIDTH;
 	isc->max_height = ISC_SAMA5D2_MAX_SUPPORT_HEIGHT;
 
+	isc->config_csc = isc_sama5d2_config_csc;
+
 	/* sama5d2-isc - 8 bits per beat */
 	isc->dcfg = ISC_DCFG_YMBSIZE_BEATS8 | ISC_DCFG_CMBSIZE_BEATS8;
 
-- 
2.25.1