path: root/drivers/gpu/drm/i915/display/intel_vdsc.c

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2018 Intel Corporation
 *
 * Author: Gaurav K Singh <gaurav.k.singh@intel.com>
 *         Manasi Navare <manasi.d.navare@intel.com>
 */

#include "i915_drv.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dsi.h"
#include "intel_vdsc.h"

enum ROW_INDEX_BPP {
	ROW_INDEX_6BPP = 0,
	ROW_INDEX_8BPP,
	ROW_INDEX_10BPP,
	ROW_INDEX_12BPP,
	ROW_INDEX_15BPP,
	MAX_ROW_INDEX
};

enum COLUMN_INDEX_BPC {
	COLUMN_INDEX_8BPC = 0,
	COLUMN_INDEX_10BPC,
	COLUMN_INDEX_12BPC,
	COLUMN_INDEX_14BPC,
	COLUMN_INDEX_16BPC,
	MAX_COLUMN_INDEX
};

/* From DSC_v1.11 spec, rc_parameter_Set syntax element typically constant */
static const u16 rc_buf_thresh[] = {
	896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
	7744, 7872, 8000, 8064
};

struct rc_parameters {
	u16 initial_xmit_delay;
	u8 first_line_bpg_offset;
	u16 initial_offset;
	u8 flatness_min_qp;
	u8 flatness_max_qp;
	u8 rc_quant_incr_limit0;
	u8 rc_quant_incr_limit1;
	struct drm_dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
};

/*
 * Selected Rate Control Related Parameter Recommended Values
 * from DSC_v1.11 spec & C Model release: DSC_model_20161212
 */
static const struct rc_parameters rc_parameters[][MAX_COLUMN_INDEX] = {
{
	/* 6BPP/8BPC */
	{ 768, 15, 6144, 3, 13, 11, 11, {
		{ 0, 4, 0 }, { 1, 6, -2 }, { 3, 8, -2 }, { 4, 8, -4 },
		{ 5, 9, -6 }, { 5, 9, -6 }, { 6, 9, -6 }, { 6, 10, -8 },
		{ 7, 11, -8 }, { 8, 12, -10 }, { 9, 12, -10 }, { 10, 12, -12 },
		{ 10, 12, -12 }, { 11, 12, -12 }, { 13, 14, -12 }
		}
	},
	/* 6BPP/10BPC */
	{ 768, 15, 6144, 7, 17, 15, 15, {
		{ 0, 8, 0 }, { 3, 10, -2 }, { 7, 12, -2 }, { 8, 12, -4 },
		{ 9, 13, -6 }, { 9, 13, -6 }, { 10, 13, -6 }, { 10, 14, -8 },
		{ 11, 15, -8 }, { 12, 16, -10 }, { 13, 16, -10 },
		{ 14, 16, -12 }, { 14, 16, -12 }, { 15, 16, -12 },
		{ 17, 18, -12 }
		}
	},
	/* 6BPP/12BPC */
	{ 768, 15, 6144, 11, 21, 19, 19, {
		{ 0, 12, 0 }, { 5, 14, -2 }, { 11, 16, -2 }, { 12, 16, -4 },
		{ 13, 17, -6 }, { 13, 17, -6 }, { 14, 17, -6 }, { 14, 18, -8 },
		{ 15, 19, -8 }, { 16, 20, -10 }, { 17, 20, -10 },
		{ 18, 20, -12 }, { 18, 20, -12 }, { 19, 20, -12 },
		{ 21, 22, -12 }
		}
	},
	/* 6BPP/14BPC */
	{ 768, 15, 6144, 15, 25, 23, 27, {
		{ 0, 16, 0 }, { 7, 18, -2 }, { 15, 20, -2 }, { 16, 20, -4 },
		{ 17, 21, -6 }, { 17, 21, -6 }, { 18, 21, -6 }, { 18, 22, -8 },
		{ 19, 23, -8 }, { 20, 24, -10 }, { 21