media: rppx1: ga: Add support for gamma out correction

Extend the RPPX1 driver to allow setting the gamma out correction
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: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Co-developed-by: Jai Luthra <jai.luthra+renesas@ideasonboard.com>
Signed-off-by: Jai Luthra <jai.luthra+renesas@ideasonboard.com>
Co-developed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

1 files changed, 54 insertions, 1 deletions

diff --git a/include/uapi/linux/media/dreamchip/rppx1-config.h b/include/uapi/linux/media/dreamchip/rppx1-config.h
index eec8a9c50bbe..aa8a078493af 100644
--- a/include/uapi/linux/media/dreamchip/rppx1-config.h
+++ b/include/uapi/linux/media/dreamchip/rppx1-config.h
@@ -90,6 +90,8 @@ enum rppx1_meas_chan {
  * @RPPX1_PARAMS_BLOCK_TYPE_CCOR_POST: POST pipe Color Correction
  * @RPPX1_PARAMS_BLOCK_TYPE_LSC_PRE1: PRE1 pipe Lens Shading Correction
  * @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
  */
 enum rppx1_params_block_type {
 	RPPX1_PARAMS_BLOCK_TYPE_WBMEAS_POST,
@@ -106,6 +108,8 @@ enum rppx1_params_block_type {
 	RPPX1_PARAMS_BLOCK_TYPE_CCOR_POST,
 	RPPX1_PARAMS_BLOCK_TYPE_LSC_PRE1,
 	RPPX1_PARAMS_BLOCK_TYPE_LSC_PRE2,
+	RPPX1_PARAMS_BLOCK_TYPE_GA_HV,
+	RPPX1_PARAMS_BLOCK_TYPE_GA_MV,
 };
 
 /**
@@ -510,6 +514,53 @@ struct rppx1_lsc_params {
 	__u16 y_sect_size[RPPX1_LSC_NUM_SECTORS];
 };
 
+/* Gamma Out */
+#define RPPX1_GA_MAX_SAMPLES 17
+
+/**
+ * enum rppx1_ga_seg_mode - Gamma out curve segmentation mode
+ *
+ * Segmentation mode of the 16 input sampling points for the Gamma Out
+ * Correction module.
+ *
+ * @RPPX1_GA_SEG_MODE_LOGARITHMIC: logarithmic-like segmentation mode
+ * @RPPX1_GA_SEG_MODE_EQUIDISTANT: equidistant segmentation mode
+ */
+enum rppx1_ga_seg_mode {
+	RPPX1_GA_SEG_MODE_LOGARITHMIC,
+	RPPX1_GA_SEG_MODE_EQUIDISTANT
+};
+
+/**
+ * struct rppx1_ga_params - Gamma Out Correction configuration
+ *
+ * The Gamma Out Correction module is available on the Human Vision Output
+ * Pipe (HV) and the Machine Vision Output Pipe (MV). Userspace selects
+ * which pipe to operate by setting the @header.type field to
+ * RPPX1_PARAMS_BLOCK_TYPE_GA_HV or RPPX1_PARAMS_BLOCK_TYPE_GA_MV.
+ *
+ * The module allows to apply a @gamma_y gamma correction curve to RGB data
+ * represented as a table of 16 entries. The 16 input sampling points can be
+ * equidistant or segmented using a logarithmic scale according to the value of
+ * @mode.
+ *
+ * The gamma curve values are 12 bits on the HV output pipe and 24 bits on the
+ * MV output pipe. Userspace is expected to provide the curve values with a
+ * bit-depth matching the one of pipe in use.
+ *
+ * @header: block header (type = RPPX1_PARAMS_BLOCK_TYPE_GA_HV or
+ *	    type = RPPX1_PARAMS_BLOCK_TYPE_GA_MV)
+ * @gamma_y: gamma out curve y-axis values
+ * @mode: gamma curve input segmentation mode (see rppx1_ga_seg_mode)
+ * @reserved: padding
+ */
+struct rppx1_ga_params {
+	struct v4l2_isp_params_block_header header;
+	__u32 gamma_y[RPPX1_GA_MAX_SAMPLES];
+	__u8 mode;
+	__u8 reserved[3];
+};
+
 /**
  * RPPX1_PARAMS_MAX_SIZE - Maximum size of all RPP-X1 parameter blocks
  *
@@ -530,7 +581,9 @@ struct rppx1_lsc_params {
 	sizeof(struct rppx1_bls_params)				+	\
 	sizeof(struct rppx1_ccor_params)			+	\
 	sizeof(struct rppx1_lsc_params)				+	\
-	sizeof(struct rppx1_lsc_params))
+	sizeof(struct rppx1_lsc_params)				+	\
+	sizeof(struct rppx1_ga_params)				+	\
+	sizeof(struct rppx1_ga_params))
 
 /* ---------------------------------------------------------------------------
  * Statistics Structures