media: rppx1: lin: Add support for gamma sensor linearization

Extend the RPPX1 driver to allow setting the gamma sensor linearization
configuration parameters. It uses the RPPX1 framework for parameters and
its writer abstraction to allow the user to control how, and when,
configuration is applied to the RPPX1.

Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

1 files changed, 49 insertions, 1 deletions

diff --git a/include/uapi/linux/media/dreamchip/rppx1-config.h b/include/uapi/linux/media/dreamchip/rppx1-config.h
index aa8a078493af..3507a9ab03df 100644
--- a/include/uapi/linux/media/dreamchip/rppx1-config.h
+++ b/include/uapi/linux/media/dreamchip/rppx1-config.h
@@ -92,6 +92,8 @@ enum rppx1_meas_chan {
  * @RPPX1_PARAMS_BLOCK_TYPE_LSC_PRE2: PRE2 pipe Lens Shading Correction
  * @RPPX1_PARAMS_BLOCK_TYPE_GA_HV: Human Vision Pipe Gamma Out Correction
  * @RPPX1_PARAMS_BLOCK_TYPE_GA_MV: Machine Vision Gamma Out Correction
+ * @RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE1: PRE1 pipe Linearization (Sensor De-gamma)
+ * @RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE2: PRE2 pipe Linearization (Sensor De-gamma)
  */
 enum rppx1_params_block_type {
 	RPPX1_PARAMS_BLOCK_TYPE_WBMEAS_POST,
@@ -110,6 +112,8 @@ enum rppx1_params_block_type {
 	RPPX1_PARAMS_BLOCK_TYPE_LSC_PRE2,
 	RPPX1_PARAMS_BLOCK_TYPE_GA_HV,
 	RPPX1_PARAMS_BLOCK_TYPE_GA_MV,
+	RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE1,
+	RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE2,
 };
 
 /**
@@ -561,6 +565,48 @@ struct rppx1_ga_params {
 	__u8 reserved[3];
 };
 
+/* Linearization (Sensor De-gamma) */
+#define RPPX1_LIN_SAMPLE_POINTS_NUM 16
+#define RPPX1_LIN_DEGAMMA_CURVE_NUM 17
+
+/**
+ * struct rppx1_lin_params - Linearization (Sensor De-gamma) configuration
+ *
+ * The RPP-X1 linearization module is available on the PRE1 and PRE2 pre-fusion
+ * pipes. Userspace selects which pipe to operate by setting the @header.type
+ * field to RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE1 or
+ * RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE2.
+ *
+ * The LIN module applies the per-color channel de-gamma linearization curves
+ * @curve_r, @curve_g and @curve_b defined on the input sampling points @dx.
+ *
+ * For the PRE1 pipe the de-gamma curves values are 24-bits, for the PRE2 pipe
+ * the de-gamma curve values are 12-bits.
+ *
+ * For the PRE1 pipe de-gamma module sampling points @dx values are in the range
+ * [0, 15] (4 bits). For the PRE2 pipe de-gamma module sampling points values
+ * are in the range [0, 7] (3 bits).
+ *
+ * Userspace is expected to provide the curve values and sampling points with a
+ * bit-depth matching the one of pipe in use.
+ *
+ * @header: block header (type = RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE1 or
+ *	    RPPX1_PARAMS_BLOCK_TYPE_LIN_PRE2)
+ * @curve_r: de-gamma linearization curve for red channel
+ * @curve_g: de-gamma linearization curve for green channel
+ * @curve_b: de-gamma linearization curve for blue channel
+ * @dx: input sampling points
+ * @reserved: padding
+ */
+struct rppx1_lin_params {
+	struct v4l2_isp_params_block_header header;
+	__u32 curve_r[RPPX1_LIN_DEGAMMA_CURVE_NUM];
+	__u32 curve_g[RPPX1_LIN_DEGAMMA_CURVE_NUM];
+	__u32 curve_b[RPPX1_LIN_DEGAMMA_CURVE_NUM];
+	__u8 dx[RPPX1_LIN_SAMPLE_POINTS_NUM];
+	__u32 reserved;
+};
+
 /**
  * RPPX1_PARAMS_MAX_SIZE - Maximum size of all RPP-X1 parameter blocks
  *
@@ -583,7 +629,9 @@ struct rppx1_ga_params {
 	sizeof(struct rppx1_lsc_params)				+	\
 	sizeof(struct rppx1_lsc_params)				+	\
 	sizeof(struct rppx1_ga_params)				+	\
-	sizeof(struct rppx1_ga_params))
+	sizeof(struct rppx1_ga_params)				+	\
+	sizeof(struct rppx1_lin_params)				+	\
+	sizeof(struct rppx1_lin_params))
 
 /* ---------------------------------------------------------------------------
  * Statistics Structures