media: atmel: atmel-isc: create callback for GAM submodule product specific

The GAM submodule is a part of the atmel-isc pipeline, and stands for
Gamma Correction. It is used to apply the gamma curve to the incoming pixels.
Create a product specific callback for initializing the GAM submodule
of the pipeline.
For sama5d2 product, there is no special configuration at this moment,
thus this function is a noop.

[hverkuil: made isc_sama5d2_config_gam static]
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/atmel/atmel-isc-base.c

@@ -663,6 +663,7 @@ static void isc_set_pipeline(struct isc_device *isc, u32 pipeline)
 	isc->config_csc(isc);
 	isc->config_cbc(isc);
 	isc->config_cc(isc);
+	isc->config_gam(isc);
 }
 
 static int isc_update_profile(struct isc_device *isc)

drivers/media/platform/atmel/atmel-isc.h

@@ -229,6 +229,8 @@ struct isc_reg_offsets {
  *			specific CBC module
  * @config_cc:		pointer to a function that initializes product
  *			specific CC module
+ * @config_gam:		pointer to a function that initializes product
+ *			specific GAMMA module
  * @config_ctrls:	pointer to a functoin that initializes product
  *			specific v4l2 controls.
  *
@@ -306,6 +308,7 @@ struct isc_device {
 		void (*config_csc)(struct isc_device *isc);
 		void (*config_cbc)(struct isc_device *isc);
 		void (*config_cc)(struct isc_device *isc);
+		void (*config_gam)(struct isc_device *isc);
 
 		void (*config_ctrls)(struct isc_device *isc,
 				     const struct v4l2_ctrl_ops *ops);

drivers/media/platform/atmel/atmel-sama5d2-isc.c

@@ -112,6 +112,11 @@ static void isc_sama5d2_config_dpc(struct isc_device *isc)
 	/* This module is not present on sama5d2 pipeline */
 }
 
+static void isc_sama5d2_config_gam(struct isc_device *isc)
+{
+	/* No specific gamma configuration */
+}
+
 /* Gamma table with gamma 1/2.2 */
 static const u32 isc_sama5d2_gamma_table[][GAMMA_ENTRIES] = {
 	/* 0 --> gamma 1/1.8 */
@@ -261,6 +266,7 @@ static int atmel_isc_probe(struct platform_device *pdev)
 	isc->config_csc = isc_sama5d2_config_csc;
 	isc->config_cbc = isc_sama5d2_config_cbc;
 	isc->config_cc = isc_sama5d2_config_cc;
+	isc->config_gam = isc_sama5d2_config_gam;
 	isc->config_ctrls = isc_sama5d2_config_ctrls;
 
 	isc->offsets.csc = ISC_SAMA5D2_CSC_OFFSET;