// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright © 2019-2020 Intel Corporation
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/of_graph.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>

#include "kmb_dsi.h"
#include "kmb_regs.h"

static struct mipi_dsi_host *dsi_host;
static struct mipi_dsi_device *dsi_device;
static struct drm_bridge *adv_bridge;

/* Default setting is 1080p, 4 lanes */
#define IMG_HEIGHT_LINES  1080
#define IMG_WIDTH_PX      1920
#define MIPI_TX_ACTIVE_LANES 4

static struct mipi_tx_frame_section_cfg mipi_tx_frame0_sect_cfg = {
	.width_pixels = IMG_WIDTH_PX,
	.height_lines = IMG_HEIGHT_LINES,
	.data_type = DSI_LP_DT_PPS_RGB888_24B,
	.data_mode = MIPI_DATA_MODE1,
	.dma_packed = 0
};

static struct mipi_tx_frame_cfg mipitx_frame0_cfg = {
	.sections[0] = &mipi_tx_frame0_sect_cfg,
	.sections[1] = NULL,
	.sections[2] = NULL,
	.sections[3] = NULL,
	.vsync_width = 5,
	.v_backporch = 36,
	.v_frontporch = 4,
	.hsync_width = 44,
	.h_backporch = 148,
	.h_frontporch = 88
};

static const struct mipi_tx_dsi_cfg mipitx_dsi_cfg = {
	.hfp_blank_en = 0,
	.eotp_en = 0,
	.lpm_last_vfp_line = 0,
	.lpm_first_vsa_line = 0,
	.sync_pulse_eventn = DSI_VIDEO_MODE_NO_BURST_EVENT,
	.hfp_blanking = SEND_BLANK_PACKET,
	.hbp_blanking = SEND_BLANK_PACKET,
	.hsa_blanking = SEND_BLANK_PACKET,
	.v_blanking = SEND_BLANK_PACKET,
};

static struct mipi_ctrl_cfg mipi_tx_init_cfg = {
	.active_lanes = MIPI_TX_ACTIVE_LANES,
	.lane_rate_mbps = MIPI_TX_LANE_DATA_RATE_MBPS,
	.ref_clk_khz = MIPI_TX_REF_CLK_KHZ,
	.cfg_clk_khz = MIPI_TX_CFG_CLK_KHZ,
	.tx_ctrl_cfg = {
			.frames[0] = &mipitx_frame0_cfg,
			.frames[1] = NULL,
			.frames[2] = NULL,
			.frames[3] = NULL,
			.tx_dsi_cfg = &mipitx_dsi_cfg,
			.line_sync_pkt_en = 0,
			.line_counter_active = 0,
			.frame_counter_active = 0,
			.tx_always_use_hact = 1,
			.tx_hact_wait_stop = 1,
			}
};

struct  mipi_hs_freq_range_cfg {
	u16 default_bit_rate_mbps;
	u8 hsfreqrange_code;
};

struct vco_params {
	u32 freq;
	u32 range;
	u32 divider;
};

static const struct vco_params vco_table[] = {
	{52, 0x3f, 8},
	{80, 0x39, 8},
	{105, 0x2f, 4},
	{160, 0x29, 4},
	{210, 0x1f, 2},
	{320, 0x19, 2},
	{420, 0x0f, 1},
	{630, 0x09, 1},
	{1100, 0x03, 1},
	{0xffff, 0x01, 1},
};

static const struct mipi_hs_freq_range_cfg
mipi_hs_freq_range[MIPI_DPHY_DEFAULT_BIT_RATES] = {
	{.default_bit_rate_mbps = 80, .hsfreqrange_code = 0x00},
	{.default_bit_rate_mbps = 90, .hsfreqrange_code = 0x10},
	{.default_bit_rate_mbps = 100, .hsfreqrange_code = 0x20},
	{.default_bit_rate_mbps = 110, .hsfreqrange_code = 0x30},
	{.default_bit_rate_mbps = 120, .hsfreqrange_code = 0x01},
	{.default_bit_rate_mbps = 130, .hsfreqrange_code = 0x11},
	{.default_bit_rate_mbps = 140, .hsfreqrange_code = 0x21},
	{.default_bit_rate_mbps = 150, .hsfreqrange_code = 0x31},
	{.default_bit_rate_mbps = 160, .hsfreqrange_code = 0x02},
	{.default_bit_rate_mbps = 170, .hsfreqrange_code = 0x12},
	{.default_bit_rate_mbps = 180, .hsfreqrange_code = 0x22},
	{.default_bit_rate_mbps = 190, .hsfreqrange_code = 0x32},
	{.default_bit_rate_mbps = 205, .hsfreqrange_code = 0x03},
	{.default_bit_rate_mbps = 220, .hsfreqrange_code = 0x13},
	{.default_bit_rate_mbps = 235, .hsfreqrange_code = 0x23},
	{.default_bit_rate_mbps = 250, .hsfreqrange_code = 0x33},
	{.default_bit_rate_mbps = 275, .hsfreqrange_code = 0x04},
	{.default_bit_rate_mbps = 300, .hsfreqrange_code = 0x14},
	{.default_bit_rate_mbps = 325, .hsfreqrange_code = 0x25},
	{.default_bit_rate_mbps = 350, .hsfreqrange_code = 0x35},
	{.default_bit_rate_mbps = 400, .hsfreqrange_code = 0x05},
	{.default_bit_rate_mbps = 450, .hsfreqrange_code = 0x16},
	{.default_bit_rate_mbps = 500, .hsfreqrange_code = 0x26},
	{.default_bit_rate_mbps = 550, .hsfreqrange_code = 0x37},
	{.default_bit_rate_mbps = 600, .hsfreqrange_code = 0x07},
	{.default_bit_rate_mbps = 650, .hsfreqrange_code = 0x18},
	{.default_bit_rate_mbps = 700, .hsfreqrange_code = 0x28},
	{.default_bit_rate_mbps = 750, .hsfreqrange_code = 0x39},
	{.default_bit_rate_mbps = 800, .hsfreqrange_code = 0x09},
	{.default_bit_rate_mbps = 850, .hsfreqrange_code = 0x19},
	{.default_bit_rate_mbps = 900, .hsfreqrange_code = 0x29},
	{.default_bit_rate_mbps = 1000, .hsfreqrange_code = 0x0A},
	{.default_bit_rate_mbps = 1050, .hsfreqrange_code = 0x1A},
	{.default_bit_rate_mbps = 1100, .hsfreqrange_code = 0x2A},
	{.default_bit_rate_mbps = 1150, .hsfreqrange_code = 0x3B},
	{.default_bit_rate_mbps = 1200, .hsfreqrange_code = 0x0B},
	{.default_bit_rate_mbps = 1250, .hsfreqrange_code = 0x1B},
	{.default_bit_rate_mbps = 1300, .hsfreqrange_code = 0x2B},
	{.default_bit_rate_mbps = 1350, .hsfreqrange_code = 0x3C},
	{.default_bit_rate_mbps = 1400, .hsfreqrange_code = 0x0C},
	{.default_bit_rate_mbps = 1450, .hsfreqrange_code = 0x1C},
	{.default_bit_rate_mbps = 1500, .hsfreqrange_code = 0x2C},
	{.default_bit_rate_mbps = 1550, .hsfreqrange_code = 0x3D},
	{.default_bit_rate_mbps = 1600, .hsfreqrange_code = 0x0D},
	{.default_bit_rate_mbps = 1650, .hsfreqrange_code = 0x1D},
	{.default_bit_rate_mbps = 1700, .hsfreqrange_code = 0x2E},
	{.default_bit_rate_mbps = 1750, .hsfreqrange_code = 0x3E},
	{.default_bit_rate_mbps = 1800, .hsfreqrange_code = 0x0E},
	{.default_bit_rate_mbps = 1850, .hsfreqrange_code = 0x1E},
	{.default_bit_rate_mbps = 1900, .hsfreqrange_code = 0x2F},
	{.default_bit_rate_mbps = 1950, .hsfreqrange_code = 0x3F},
	{.default_bit_rate_mbps = 2000, .hsfreqrange_code = 0x0F},
	{.default_bit_rate_mbps = 2050, .hsfreqrange_code = 0x40},
	{.default_bit_rate_mbps = 2100, .hsfreqrange_code = 0x41},
	{.default_bit_rate_mbps = 2150, .hsfreqrange_code = 0x42},
	{.default_bit_rate_mbps = 2200, .hsfreqrange_code = 0x43},
	{.default_bit_rate_mbps = 2250, .hsfreqrange_code = 0x44},
	{.default_bit_rate_mbps = 2300, .hsfreqrange_code = 0x45},
	{.default_bit_rate_mbps = 2350, .hsfreqrange_code = 0x46},
	{.default_bit_rate_mbps = 2400, .hsfreqrange_code = 0x47},
	{.default_bit_rate_mbps = 2450, .hsfreqrange_code = 0x48},
	{.default_bit_rate_mbps = 2500, .hsfreqrange_code = 0x49}
};

static void kmb_dsi_clk_disable(struct kmb_dsi *kmb_dsi)
{
	clk_disable_unprepare(kmb_dsi->clk_mipi);
	clk_disable_unprepare(kmb_dsi->clk_mipi_ecfg);
	clk_disable_unprepare(kmb_dsi->clk_mipi_cfg);
}

void kmb_dsi_host_unregister(struct kmb_dsi *kmb_dsi)
{
	kmb_dsi_clk_disable(kmb_dsi);
	mipi_dsi_host_unregister(kmb_dsi->host);
}

/*
 * This DSI can only be paired with bridges that do config through i2c
 * which is ADV 7535 in the KMB EVM
 */
static ssize_t kmb_dsi_host_transfer(struct mipi_dsi_host *host,
				     const struct mipi_dsi_msg *msg)
{
	return 0;
}

static int kmb_dsi_host_attach(struct mipi_dsi_host *host,
			       struct mipi_dsi_device *dev)
{
	return 0;
}

static int kmb_dsi_host_detach(struct mipi_dsi_host *host,
			       struct mipi_dsi_device *dev)
{
	return 0;
}

static const struct mipi_dsi_host_ops kmb_dsi_host_ops = {
	.attach = kmb_dsi_host_attach,
	.detach = kmb_dsi_host_detach,
	.transfer = kmb_dsi_host_transfer,
};

int kmb_dsi_host_bridge_init(struct device *dev)
{
	struct device_node *encoder_node, *dsi_out;

	/* Create and register MIPI DSI host */
	if (!dsi_host) {
		dsi_host = kzalloc(sizeof(*dsi_host), GFP_KERNEL);
		if (!dsi_host)
			return -ENOMEM;

		dsi_host->ops = &kmb_dsi_host_ops;

		if (!dsi_device) {
			dsi_device = kzalloc(sizeof(*dsi_device), GFP_KERNEL);
			if (!dsi_device) {
				kfree(dsi_host);
				return -ENOMEM;
			}
		}

		dsi_host->dev = dev;
		mipi_dsi_host_register(dsi_host);
	}

	/* Find ADV7535 node and initialize it */
	dsi_out = of_graph_get_endpoint_by_regs(dev->of_node, 0, 1);
	if (!dsi_out) {
		DRM_ERROR("Failed to get dsi_out node info from DT\n");
		return -EINVAL;
	}
	encoder_node = of_graph_get_remote_port_parent(dsi_out);
	if (!encoder_node) {
		of_node_put(dsi_out);
		DRM_ERROR("Failed to get bridge info from DT\n");
		return -EINVAL;
	}
	/* Locate drm bridge from the hdmi encoder DT node */
	adv_bridge = of_drm_find_bridge(encoder_node);
	of_node_put(dsi_out);
	of_node_put(encoder_node);
	if (!adv_bridge) {
		DRM_DEBUG("Wait for external bridge driver DT\n");
		return -EPROBE_DEFER;
	}

	return 0;
}

static u32 mipi_get_datatype_params(u32 data_type, u32 data_mode,
				    struct mipi_data_type_params *params)
{
	struct mipi_data_type_params data_type_param;

	switch (data_type) {
	case DSI_LP_DT_PPS_YCBCR420_12B:
		data_type_param.size_constraint_pixels = 2;
		data_type_param.size_constraint_bytes = 3;
		switch (data_mode) {
			/* Case 0 not supported according to MDK */
		case 1:
		case 2:
		case 3:
			data_type_param.pixels_per_pclk = 2;
			data_type_param.bits_per_pclk = 24;
			break;
		default:
			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
			return -EINVAL;
		};
		break;
	case DSI_LP_DT_PPS_YCBCR422_16B:
		data_type_param.size_constraint_pixels = 2;
		data_type_param.size_constraint_bytes = 4;
		switch (data_mode) {
			/* Case 0 and 1 not supported according
			 * to MDK
			 */
		case 2:
			data_type_param.pixels_per_pclk = 1;
			data_type_param.bits_per_pclk = 16;
			break;
		case 3:
			data_type_param.pixels_per_pclk = 2;
			data_type_param.bits_per_pclk = 32;
			break;
		default:
			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
			return -EINVAL;
		};
		break;
	case DSI_LP_DT_LPPS_YCBCR422_20B:
	case DSI_LP_DT_PPS_YCBCR422_24B:
		data_type_param.size_constraint_pixels = 2;
		data_type_param.size_constraint_bytes = 6;
		switch (data_mode) {
			/* Case 0 not supported according to MDK */
		case 1:
		case 2:
		case 3:
			data_type_param.pixels_per_pclk = 1;
			data_type_param.bits_per_pclk = 24;
			break;
		default:
			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
			return -EINVAL;
		};
		break;
	case DSI_LP_DT_PPS_RGB565_16B:
		data_type_param.size_constraint_pixels = 1;
		data_type_param.size_constraint_bytes = 2;
		switch (data_mode) {
		case 0:
		case 1:
			data_type_param.pixels_per_pclk = 1;
			data_type_param.bits_per_pclk = 16;
			break;
		case 2:
		case 3:
			data_type_param.pixels_per_pclk = 2;
			data_type_param.bits_per_pclk = 32;
			break;
		default:
			DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode);
			return -EINVAL;
		};
		break;
	case DSI_LP_DT_PPS_RGB666_18B:
		data_type_param.size_constraint_pixels = 4;
		data_type_param.size_constraint_bytes = 9;
		data_type_param.bits_per_pclk = 18;
		data_type_param.pixels_per_pclk = 1;
		break;
	case DSI_LP_DT_LPPS_RGB666_18B:
	case DSI_LP_DT_PPS_RGB888_24B:
		data_type_param.size_constraint_pixels = 1;
		data_type_param.size_constraint_bytes = 3;
		data_type_param.bits_per_pclk = 24;
		data_type_param.pixels_per_pclk = 1;
		break;
	case DSI_LP_DT_PPS_RGB101010_30B:
		data_type_param.size_constraint_pixels = 4;
		data_type_param.size_constraint_bytes = 15;
		data_type_param.bits_per_pclk = 30;
		data_type_param.pixels_per_pclk = 1;
		break;
	default:
		DRM_ERROR("DSI: Invalid data_type %d\n", data_type);
		return -EINVAL;
	};

	*params = data_type_param;
	return 0;
}

static u32 compute_wc(u32 width_px, u8 size_constr_p, u8 size_constr_b)
{
	/* Calculate the word count for each long packet */
	return (((width_px / size_constr_p) * size_constr_b) & 0xffff);
}

static u32 compute_unpacked_bytes(u32 wc, u8 bits_per_pclk)
{
	/* Number of PCLK cycles needed to transfer a line
	 * with each PCLK cycle, 4 Bytes are sent through the PPL module
	 */
	return ((wc * 8) / bits_per_pclk) * 4;
}

static u32 mipi_tx_fg_section_cfg_regs(struct kmb_dsi *kmb_dsi,
				       u8 frame_id, u8 section,
				       u32 height_lines, u32 unpacked_bytes,
				       struct mipi_tx_frame_sect_phcfg *ph_cfg)
{
	u32 cfg = 0;
	u32 ctrl_no = MIPI_CTRL6;
	u32 reg_adr;

	/* Frame section packet header */
	/* Word count bits [15:0] */
	cfg = (ph_cfg->wc & MIPI_TX_SECT_WC_MASK) << 0;

	/* Data type (bits [21:16]) */
	cfg |= ((ph_cfg->data_type & MIPI_TX_SECT_DT_MASK)
		<< MIPI_TX_SECT_DT_SHIFT);

	/* Virtual channel (bits [23:22]) */
	cfg |= ((ph_cfg->vchannel & MIPI_TX_SECT_VC_MASK)
		<< MIPI_TX_SECT_VC_SHIFT);

	/* Data mode (bits [24:25]) */
	cfg |= ((ph_cfg->data_mode & MIPI_TX_SECT_DM_MASK)
		<< MIPI_TX_SECT_DM_SHIFT);
	if (ph_cfg->dma_packed)
		cfg |= MIPI_TX_SECT_DMA_PACKED;

	dev_dbg(kmb_dsi->dev,
		"ctrl=%d frame_id=%d section=%d cfg=%x packed=%d\n",
		  ctrl_no, frame_id, section, cfg, ph_cfg->dma_packed);
	kmb_write_mipi(kmb_dsi,
		       (MIPI_TXm_HS_FGn_SECTo_PH(ctrl_no, frame_id, section)),
		       cfg);

	/* Unpacked bytes */

	/* There are 4 frame generators and each fg has 4 sections
	 * There are 2 registers for unpacked bytes (# bytes each
	 * section occupies in memory)
	 * REG_UNPACKED_BYTES0: [15:0]-BYTES0, [31:16]-BYTES1
	 * REG_UNPACKED_BYTES1: [15:0]-BYTES2, [31:16]-BYTES3
	 */
	reg_adr =
	    MIPI_TXm_HS_FGn_SECT_UNPACKED_BYTES0(ctrl_no,
						 frame_id) + (section / 2) * 4;
	kmb_write_bits_mipi(kmb_dsi, reg_adr, (section % 2) * 16, 16,
			    unpacked_bytes);
	dev_dbg(kmb_dsi->dev,
		"unpacked_bytes = %d, wordcount = %d\n", unpacked_bytes,
		  ph_cfg->wc);

	/* Line config */
	reg_adr = MIPI_TXm_HS_FGn_SECTo_LINE_CFG(ctrl_no, frame_id, section);
	kmb_write_mipi(kmb_dsi, reg_adr, height_lines);
	return 0;
}

static u32 mipi_tx_fg_section_cfg(struct kmb_dsi *kmb_dsi,
				  u8 frame_id, u8 section,
				  struct mipi_tx_frame_section_cfg *frame_scfg,
				  u32 *bits_per_pclk, u32 *wc)
{
	u32 ret = 0;
	u32 unpacked_bytes;
	struct mipi_data_type_params data_type_parameters;
	struct mipi_tx_frame_sect_phcfg ph_cfg;

	ret = mipi_get_datatype_params(frame_scfg->data_type,
				       frame_scfg->data_mode,
				       &data_type_parameters);
	if (ret)
		return ret;

	/* Packet width has to be a multiple of the minimum packet width
	 * (in pixels) set for each data type
	 */
	if (frame_scfg->width_pixels %
	    data_type_parameters.size_constraint_pixels != 0)
		return -EINVAL;

	*wc = compute_wc(frame_scfg->width_pixels,
			 data_type_parameters.size_constraint_pixels,
			 data_type_parameters.size_constraint_bytes);
	unpacked_bytes = compute_unpacked_bytes(*wc,
						data_type_parameters.bits_per_pclk);
	ph_cfg.wc = *wc;
	ph_cfg.data_mode = frame_scfg->data_mode;
	ph_cfg.data_type = frame_scfg->data_type;
	ph_cfg.dma_packed = frame_scfg->dma_packed;
	ph_cfg.vchannel = frame_id;

	mipi_tx_fg_section_cfg_regs(kmb_dsi, frame_id, section,
				    frame_scfg->height_lines,
				    unpacked_bytes, &ph_cfg);

	/* Caller needs bits_per_clk for additional caluclations */
	*bits_per_pclk = data_type_parameters.bits_per_pclk;

	return 0;
}

static void mipi_tx_fg_cfg_regs(struct kmb_dsi *kmb_dsi, u8 frame_gen,
				struct mipi_tx_frame_timing_cfg *fg_cfg)
{
	u32 sysclk;
	u32 ppl_llp_ratio;
	u32 ctrl_no = MIPI_CTRL6, reg_adr, val, offset;

	/* 500 Mhz system clock minus 50 to account for the difference in
	 * MIPI clock speed in RTL tests
	 */
	sysclk = kmb_dsi->sys_clk_mhz - 50;

	/* PPL-Pixel Packing Layer, LLP-Low Level Protocol
	 * Frame genartor timing parameters are clocked on the system clock,
	 * whereas as the equivalent parameters in the LLP blocks are clocked
	 * on LLP Tx clock from the D-PHY - BYTE clock
	 */

	/* Multiply by 1000 to maintain precision */
	ppl_llp_ratio = ((fg_cfg->bpp / 8) * sysclk * 1000) /
	    ((fg_cfg->lane_rate_mbps / 8) * fg_cfg->active_lanes);

	dev_dbg(kmb_dsi->dev, "ppl_llp_ratio=%d\n", ppl_llp_ratio);
	dev_dbg(kmb_dsi->dev, "bpp=%d sysclk=%d lane-rate=%d active-lanes=%d\n",
		fg_cfg->bpp, sysclk, fg_cfg->lane_rate_mbps,
		 fg_cfg->active_lanes);

	/* Frame generator number of lines */
	reg_adr = MIPI_TXm_HS_FGn_NUM_LINES(ctrl_no, frame_gen);
	kmb_write_mipi(kmb_dsi, reg_adr, fg_cfg->v_active);

	/* vsync width
	 * There are 2 registers for vsync width (VSA in lines for
	 * channels 0-3)
	 * REG_VSYNC_WIDTH0: [15:0]-VSA for channel0, [31:16]-VSA for channel1
	 * REG_VSYNC_WIDTH1: [15:0]-VSA for channel2, [31:16]-VSA for channel3
	 */
	offset = (frame_gen % 2) * 16;
	reg_adr = MIPI_TXm_HS_VSYNC_WIDTHn(ctrl_no, frame_gen / 2);
	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->vsync_width);

	/* vertical backporch (vbp) */
	reg_adr = MIPI_TXm_HS_V_BACKPORCHESn(ctrl_no, frame_gen / 2);
	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->v_backporch);

	/* vertical frontporch (vfp) */
	reg_adr = MIPI_TXm_HS_V_FRONTPORCHESn(ctrl_no, frame_gen / 2);
	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->v_frontporch);

	/* vertical active (vactive) */
	reg_adr = MIPI_TXm_HS_V_ACTIVEn(ctrl_no, frame_gen / 2);
	kmb_write_bits_mipi(kmb_dsi, reg_adr, offset, 16, fg_cfg->v_active);

	/* hsync width */
	reg_adr = MIPI_TXm_HS_HSYNC_WIDTHn(ctrl_no, frame_gen);
	kmb_write_mipi(kmb_dsi, reg_adr,
		       (fg_cfg->hsync_width * ppl_llp_ratio) / 1000);

	/* horizontal backporch (hbp) */
	reg_adr = MIPI_TXm_HS_H_BACKPORCHn(ctrl_no, frame_gen);
	kmb_write_mipi(kmb_dsi, reg_adr,
		       (fg_cfg->h_backporch * ppl_llp_ratio) / 1000);

	/* horizontal frontporch (hfp) */
	reg_adr = MIPI_TXm_HS_H_FRONTPORCHn(ctrl_no, frame_gen);
	kmb_write_mipi(kmb_dsi, reg_adr,
		       (fg_cfg->h_frontporch * ppl_llp_ratio) / 1000);

	/* horizontal active (ha) */
	reg_adr = MIPI_TXm_HS_H_ACTIVEn(ctrl_no, frame_gen);

	/* convert h_active which is wc in bytes to cycles */
	val = (fg_cfg->h_active * sysclk * 1000) /
	    ((fg_cfg->lane_rate_mbps / 8) * fg_cfg->active_lanes);
	val /= 1000;
	kmb_write_mipi(kmb_dsi, reg_adr, val);

	/* llp hsync width */
	reg_adr = MIPI_TXm_HS_LLP_HSYNC_WIDTHn(ctrl_no, frame_gen);
	kmb_write_mipi(kmb_dsi, reg_adr, fg_cfg->hsync_width * (fg_cfg->bpp / 8));

	/* llp h backporch */
	reg_adr = MIPI_TXm_HS_LLP_H_BACKPORCHn(ctrl_no, frame_gen);
	kmb_write_mipi(kmb_dsi, reg_adr, fg_cfg->h_backporch * (fg_cfg->bpp / 8));

	/* llp h frontporch */
	reg_adr = MIPI_TXm_HS_LLP_H_FRONTPORCHn(ctrl_no, frame_gen);
	kmb_write_mipi(kmb_dsi, reg_adr,
		       fg_cfg->h_frontporch * (fg_cfg->bpp / 8));
}

static void mipi_tx_fg_cfg(struct kmb_dsi *kmb_dsi, u8 frame_gen,
			   u8 active_lanes, u32 bpp, u32 wc,
			   u32 lane_rate_mbps, struct mipi_tx_frame_cfg *fg_cfg)
{
	u32 i, fg_num_lines = 0;
	struct mipi_tx_frame_timing_cfg fg_t_cfg;

	/* Calculate the total frame generator number of
	 * lines based on it's active sections
	 */
	for (i = 0; i < MIPI_TX_FRAME_GEN_SECTIONS; i++) {
		if (fg_cfg->sections[i])
			fg_num_lines += fg_cfg->sections[i]->height_lines;
	}

	fg_t_cfg.bpp = bpp;
	fg_t_cfg.lane_rate_mbps = lane_rate_mbps;
	fg_t_cfg.hsync_width = fg_cfg->hsync_width;
	fg_t_cfg.h_backporch = fg_cfg->h_backporch;
	fg_t_cfg.h_frontporch = fg_cfg->h_frontporch;
	fg_t_cfg.h_active = wc;
	fg_t_cfg.vsync_width = fg_cfg->vsync_width;
	fg_t_cfg.v_backporch = fg_cfg->v_backporch;
	fg_t_cfg.v_frontporch = fg_cfg->v_frontporch;
	fg_t_cfg.v_active = fg_num_lines;
	fg_t_cfg.active_lanes = active_lanes;

	/* Apply frame generator timing setting */
	mipi_tx_fg_cfg_regs(kmb_dsi, frame_gen, &fg_t_cfg);
}

static void mipi_tx_multichannel_fifo_cfg(struct kmb_dsi *kmb_dsi,
					  u8 active_lanes, u8 vchannel_id)
{
	u32 fifo_size, fifo_rthreshold;
	u32 ctrl_no = MIPI_CTRL6;

	/* Clear all mc fifo channel sizes and thresholds */
	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_CTRL_EN, 0);
	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_CHAN_ALLOC0, 0);
	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_CHAN_ALLOC1, 0);
	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_RTHRESHOLD0, 0);
	kmb_write_mipi(kmb_dsi, MIPI_TX_HS_MC_FIFO_RTHRESHOLD1, 0);

	fifo_size = ((active_lanes > MIPI_D_LANES_PER_DPHY) ?
		     MIPI_CTRL_4LANE_MAX_MC_FIFO_LOC :
		     MIPI_CTRL_2LANE_MAX_MC_FIFO_LOC) - 1;

	/* MC fifo size for virtual channels 0-3
	 * REG_MC_FIFO_CHAN_ALLOC0: [8:0]-channel0, [24:16]-channel1
	 * REG_MC_FIFO_CHAN_ALLOC1: [8:0]-2, [24:16]-channel3
	 */
	SET_MC_FIFO_CHAN_ALLOC(kmb_dsi, ctrl_no, vchannel_id, fifo_size);

	/* Set threshold to half the fifo size, actual size=size*16 */
	fifo_rthreshold = ((fifo_size) * 8) & BIT_MASK_16;
	SET_MC_FIFO_RTHRESHOLD(kmb_dsi, ctrl_no, vchannel_id, fifo_rthreshold);

	/* Enable the MC FIFO channel corresponding to the Virtual Channel */
	kmb_set_bit_mipi(kmb_dsi, MIPI_TXm_HS_MC_FIFO_CTRL_EN(ctrl_no),
			 vchannel_id);
}

static void mipi_tx_ctrl_cfg(struct kmb_dsi *kmb_dsi, u8 fg_id,
			     struct mipi_ctrl_cfg *ctrl_cfg)
{
	u32 sync_cfg = 0, ctrl = 0, fg_en;
	u32 ctrl_no = MIPI_CTRL6;

	/* MIPI_TX_HS_SYNC_CFG */
	if (ctrl_cfg->tx_ctrl_cfg.line_sync_pkt_en)
		sync_cfg |= LINE_SYNC_PKT_ENABLE;
	if (ctrl_cfg->tx_ctrl_cfg.frame_counter_active)
		sync_cfg |= FRAME_COUNTER_ACTIVE;
	if (ctrl_cfg->tx_ctrl_cfg.line_counter_active)
		sync_cfg |= LINE_COUNTER_ACTIVE;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->v_blanking)
		sync_cfg |= DSI_V_BLANKING;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hsa_blanking)
		sync_cfg |= DSI_HSA_BLANKING;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hbp_blanking)
		sync_cfg |= DSI_HBP_BLANKING;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hfp_blanking)
		sync_cfg |= DSI_HFP_BLANKING;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->sync_pulse_eventn)
		sync_cfg |= DSI_SYNC_PULSE_EVENTN;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->lpm_first_vsa_line)
		sync_cfg |= DSI_LPM_FIRST_VSA_LINE;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->lpm_last_vfp_line)
		sync_cfg |= DSI_LPM_LAST_VFP_LINE;

	/* Enable frame generator */
	fg_en = 1 << fg_id;
	sync_cfg |= FRAME_GEN_EN(fg_en);

	if (ctrl_cfg->tx_ctrl_cfg.tx_always_use_hact)
		sync_cfg |= ALWAYS_USE_HACT(fg_en);
	if (ctrl_cfg->tx_ctrl_cfg.tx_hact_wait_stop)
		sync_cfg |= HACT_WAIT_STOP(fg_en);

	dev_dbg(kmb_dsi->dev, "sync_cfg=%d fg_en=%d\n", sync_cfg, fg_en);

	/* MIPI_TX_HS_CTRL */

	/* type:DSI, source:LCD */
	ctrl = HS_CTRL_EN | TX_SOURCE;
	ctrl |= LCD_VC(fg_id);
	ctrl |= ACTIVE_LANES(ctrl_cfg->active_lanes - 1);
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->eotp_en)
		ctrl |= DSI_EOTP_EN;
	if (ctrl_cfg->tx_ctrl_cfg.tx_dsi_cfg->hfp_blank_en)
		ctrl |= DSI_CMD_HFP_EN;

	/*67 ns stop time */
	ctrl |= HSEXIT_CNT(0x43);

	kmb_write_mipi(kmb_dsi, MIPI_TXm_HS_SYNC_CFG(ctrl_no), sync_cfg);
	kmb_write_mipi(kmb_dsi, MIPI_TXm_HS_CTRL(ctrl_no), ctrl);
}

static u32 mipi_tx_init_cntrl(struct kmb_dsi *kmb_dsi,
			      struct mipi_ctrl_cfg *ctrl_cfg)
{
	u32 ret = 0;
	u8 active_vchannels = 0;
	u8 frame_id, sect;
	u32 bits_per_pclk = 0;
	u32 word_count = 0;
	struct mipi_tx_frame_cfg *frame;

	/* This is the order to initialize MIPI TX:
	 * 1. set frame section parameters
	 * 2. set frame specific parameters
	 * 3. connect lcd to mipi
	 * 4. multi channel fifo cfg
	 * 5. set mipitxcctrlcfg
	 */

	for (frame_id = 0; frame_id < 4; frame_id++) {
		frame = ctrl_cfg->tx_ctrl_cfg.frames[frame_id];

		/* Find valid frame, assume only one valid frame */
		if (!frame)
			continue;

		/* Frame Section configuration */
		/* TODO - assume there is only one valid section in a frame,
		 * so bits_per_pclk and word_count are only set once
		 */
		for (sect = 0; sect < MIPI_CTRL_VIRTUAL_CHANNELS; sect++) {
			if (!frame->sections[sect])
				continue;

			ret = mipi_tx_fg_section_cfg(kmb_dsi, frame_id, sect,
						     frame->sections[sect],
						     &bits_per_pclk,
						     &word_count);
			if (ret)
				return ret;
		}

		/* Set frame specific parameters */
		mipi_tx_fg_cfg(kmb_dsi, frame_id, ctrl_cfg->active_lanes,
			       bits_per_pclk, word_count,
			       ctrl_cfg->lane_rate_mbps, frame);

		active_vchannels++;

		/* Stop iterating as only one virtual channel
		 * shall be used for LCD connection
		 */
		break;
	}

	if (active_vchannels == 0)
		return -EINVAL;
	/* Multi-Channel FIFO Configuration */
	mipi_tx_multichannel_fifo_cfg(kmb_dsi, ctrl_cfg->active_lanes, frame_id);

	/* Frame Generator Enable */
	mipi_tx_ctrl_cfg(kmb_dsi, frame_id, ctrl_cfg);

	return ret;
}

static void test_mode_send(struct kmb_dsi *kmb_dsi, u32 dphy_no,
			   u32 test_code, u32 test_data)
{
	/* Steps to send test code:
	 * - set testclk HIGH
	 * - set testdin with test code
	 * - set testen HIGH
	 * - set testclk LOW
	 * - set testen LOW
	 */

	/* Set testclk high */
	SET_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);

	/* Set testdin */
	SET_TEST_DIN0_3(kmb_dsi, dphy_no, test_code);

	/* Set testen high */
	SET_DPHY_TEST_CTRL1_EN(kmb_dsi, dphy_no);

	/* Set testclk low */
	CLR_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);

	/* Set testen low */
	CLR_DPHY_TEST_CTRL1_EN(kmb_dsi, dphy_no);

	if (test_code) {
		/*  Steps to send test data:
		 * - set testen LOW
		 * - set testclk LOW
		 * - set testdin with data
		 * - set testclk HIGH
		 */

		/* Set testen low */
		CLR_DPHY_TEST_CTRL1_EN(kmb_dsi, dphy_no);

		/* Set testclk low */
		CLR_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);

		/* Set data in testdin */
		kmb_write_mipi(kmb_dsi,
			       DPHY_TEST_DIN0_3 + ((dphy_no / 0x4) * 0x4),
			       test_data << ((dphy_no % 4) * 8));

		/* Set testclk high */
		SET_DPHY_TEST_CTRL1_CLK(kmb_dsi, dphy_no);
	}
}

static inline void
	set_test_mode_src_osc_freq_target_low_bits(struct kmb_dsi *kmb_dsi,
						   u32 dphy_no,
						   u32 freq)
{
	/* Typical rise/fall time=166, refer Table 1207 databook,
	 * sr_osc_freq_target[7:0]
	 */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES,
		       (freq & 0x7f));
}

static inline void
	set_test_mode_src_osc_freq_target_hi_bits(struct kmb_dsi *kmb_dsi,
						  u32 dphy_no,
						  u32 freq)
{
	u32 data;

	/* Flag this as high nibble */
	data = ((freq >> 6) & 0x1f) | (1 << 7);

	/* Typical rise/fall time=166, refer Table 1207 databook,
	 * sr_osc_freq_target[11:7]
	 */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES, data);
}

static void mipi_tx_get_vco_params(struct vco_params *vco)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(vco_table); i++) {
		if (vco->freq < vco_table[i].freq) {
			*vco = vco_table[i];
			return;
		}
	}

	WARN_ONCE(1, "Invalid vco freq = %u for PLL setup\n", vco->freq);
}

static void mipi_tx_pll_setup(struct kmb_dsi *kmb_dsi, u32 dphy_no,
			      u32 ref_clk_mhz, u32 target_freq_mhz)
{
	u32 best_n = 0, best_m = 0;
	u32 n = 0, m = 0, div = 0, delta, freq = 0, t_freq;
	u32 best_freq_delta = 3000;

	/* pll_ref_clk: - valid range: 2~64 MHz; Typically 24 MHz
	 * Fvco: - valid range: 320~1250 MHz (Gen3 D-PHY)
	 * Fout: - valid range: 40~1250 MHz (Gen3 D-PHY)
	 * n: - valid range [0 15]
	 * N: - N = n + 1
	 *      -valid range: [1 16]
	 *      -conditions: - (pll_ref_clk / N) >= 2 MHz
	 *             -(pll_ref_clk / N) <= 8 MHz
	 * m: valid range [62 623]
	 * M: - M = m + 2
	 *      -valid range [64 625]
	 *      -Fvco = (M/N) * pll_ref_clk
	 */
	struct vco_params vco_p = {
		.range = 0,
		.divider = 1,
	};

	vco_p.freq = target_freq_mhz;
	mipi_tx_get_vco_params(&vco_p);

	/* Search pll n parameter */
	for (n = PLL_N_MIN; n <= PLL_N_MAX; n++) {
		/* Calculate the pll input frequency division ratio
		 * multiply by 1000 for precision -
		 * no floating point, add n for rounding
		 */
		div = ((ref_clk_mhz * 1000) + n) / (n + 1);

		/* Found a valid n parameter */
		if ((div < 2000 || div > 8000))
			continue;

		/* Search pll m parameter */
		for (m = PLL_M_MIN; m <= PLL_M_MAX; m++) {
			/* Calculate the Fvco(DPHY PLL output frequency)
			 * using the current n,m params
			 */
			freq = div * (m + 2);
			freq /= 1000;

			/* Trim the potential pll freq to max supported */
			if (freq > PLL_FVCO_MAX)
				continue;

			delta = abs(freq - target_freq_mhz);

			/* Select the best (closest to target pll freq)
			 * n,m parameters so far
			 */
			if (delta < best_freq_delta) {
				best_n = n;
				best_m = m;
				best_freq_delta = delta;
			}
		}
	}

	/* Program vco_cntrl parameter
	 * PLL_VCO_Control[5:0] = pll_vco_cntrl_ovr,
	 * PLL_VCO_Control[6]   = pll_vco_cntrl_ovr_en
	 */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_VCO_CTRL, (vco_p.range
								| (1 << 6)));

	/* Program m, n pll parameters */
	dev_dbg(kmb_dsi->dev, "m = %d n = %d\n", best_m, best_n);

	/* PLL_Input_Divider_Ratio[3:0] = pll_n_ovr */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_INPUT_DIVIDER,
		       (best_n & 0x0f));

	/* m - low nibble PLL_Loop_Divider_Ratio[4:0]
	 * pll_m_ovr[4:0]
	 */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_FEEDBACK_DIVIDER,
		       (best_m & 0x1f));

	/* m - high nibble PLL_Loop_Divider_Ratio[4:0]
	 * pll_m_ovr[9:5]
	 */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_FEEDBACK_DIVIDER,
		       ((best_m >> 5) & 0x1f) | PLL_FEEDBACK_DIVIDER_HIGH);

	/* Enable overwrite of n,m parameters :pll_n_ovr_en, pll_m_ovr_en */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_OUTPUT_CLK_SEL,
		       (PLL_N_OVR_EN | PLL_M_OVR_EN));

	/* Program Charge-Pump parameters */

	/* pll_prop_cntrl-fixed values for prop_cntrl from DPHY doc */
	t_freq = target_freq_mhz * vco_p.divider;
	test_mode_send(kmb_dsi, dphy_no,
		       TEST_CODE_PLL_PROPORTIONAL_CHARGE_PUMP_CTRL,
		       ((t_freq > 1150) ? 0x0C : 0x0B));

	/* pll_int_cntrl-fixed value for int_cntrl from DPHY doc */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_INTEGRAL_CHARGE_PUMP_CTRL,
		       0x00);

	/* pll_gmp_cntrl-fixed value for gmp_cntrl from DPHY doci */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_GMP_CTRL, 0x10);

	/* pll_cpbias_cntrl-fixed value for cpbias_cntrl from DPHY doc */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_CHARGE_PUMP_BIAS, 0x10);

	/* pll_th1 -Lock Detector Phase error threshold,
	 * document gives fixed value
	 */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_PHASE_ERR_CTRL, 0x02);

	/* PLL Lock Configuration */

	/* pll_th2 - Lock Filter length, document gives fixed value */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_LOCK_FILTER, 0x60);

	/* pll_th3- PLL Unlocking filter, document gives fixed value */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_UNLOCK_FILTER, 0x03);

	/* pll_lock_sel-PLL Lock Detector Selection,
	 * document gives fixed value
	 */
	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_PLL_LOCK_DETECTOR, 0x02);
}

static void set_slewrate_gt_1500(struct kmb_dsi *kmb_dsi, u32 dphy_no)
{
	u32 test_code = 0, test_data = 0;
	/* Bypass slew rate calibration algorithm
	 * bits[1:0} srcal_en_ovr_en, srcal_en_ovr
	 */
	test_code = TEST_CODE_SLEW_RATE_OVERRIDE_CTRL;
	test_data = 0x02;
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Disable slew rate calibration */
	test_code = TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL;
	test_data = 0x00;
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
}

static void set_slewrate_gt_1000(struct kmb_dsi *kmb_dsi, u32 dphy_no)
{
	u32 test_code = 0, test_data = 0;

	/* BitRate: > 1 Gbps && <= 1.5 Gbps: - slew rate control ON
	 * typical rise/fall times: 166 ps
	 */

	/* Do not bypass slew rate calibration algorithm
	 * bits[1:0}=srcal_en_ovr_en, srcal_en_ovr, bit[6]=sr_range
	 */
	test_code = TEST_CODE_SLEW_RATE_OVERRIDE_CTRL;
	test_data = (0x03 | (1 << 6));
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Enable slew rate calibration */
	test_code = TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL;
	test_data = 0x01;
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Set sr_osc_freq_target[6:0] low nibble
	 * typical rise/fall time=166, refer Table 1207 databook
	 */
	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
	test_data = (0x72f & 0x7f);
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Set sr_osc_freq_target[11:7] high nibble
	 * Typical rise/fall time=166, refer Table 1207 databook
	 */
	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
	test_data = ((0x72f >> 6) & 0x1f) | (1 << 7);
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
}

static void set_slewrate_lt_1000(struct kmb_dsi *kmb_dsi, u32 dphy_no)
{
	u32 test_code = 0, test_data = 0;

	/* lane_rate_mbps <= 1000 Mbps
	 * BitRate:  <= 1 Gbps:
	 * - slew rate control ON
	 * - typical rise/fall times: 225 ps
	 */

	/* Do not bypass slew rate calibration algorithm */
	test_code = TEST_CODE_SLEW_RATE_OVERRIDE_CTRL;
	test_data = (0x03 | (1 << 6));
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Enable slew rate calibration */
	test_code = TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL;
	test_data = 0x01;
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Typical rise/fall time=255, refer Table 1207 databook */
	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
	test_data = (0x523 & 0x7f);
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Set sr_osc_freq_target[11:7] high nibble */
	test_code = TEST_CODE_SLEW_RATE_DDL_CYCLES;
	test_data = ((0x523 >> 6) & 0x1f) | (1 << 7);
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
}

static void setup_pll(struct kmb_dsi *kmb_dsi, u32 dphy_no,
		      struct mipi_ctrl_cfg *cfg)
{
	u32 test_code = 0, test_data = 0;

	/* Set PLL regulator in bypass */
	test_code = TEST_CODE_PLL_ANALOG_PROG;
	test_data = 0x01;
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* PLL Parameters Setup */
	mipi_tx_pll_setup(kmb_dsi, dphy_no, cfg->ref_clk_khz / 1000,
			  cfg->lane_rate_mbps / 2);

	/* Set clksel */
	kmb_write_bits_mipi(kmb_dsi, DPHY_INIT_CTRL1, PLL_CLKSEL_0, 2, 0x01);

	/* Set pll_shadow_control */
	kmb_set_bit_mipi(kmb_dsi, DPHY_INIT_CTRL1, PLL_SHADOW_CTRL);
}

static void set_lane_data_rate(struct kmb_dsi *kmb_dsi, u32 dphy_no,
			       struct mipi_ctrl_cfg *cfg)
{
	u32 i, test_code = 0, test_data = 0;

	for (i = 0; i < MIPI_DPHY_DEFAULT_BIT_RATES; i++) {
		if (mipi_hs_freq_range[i].default_bit_rate_mbps <
		    cfg->lane_rate_mbps)
			continue;

		/* Send the test code and data */
		/* bit[6:0] = hsfreqrange_ovr bit[7] = hsfreqrange_ovr_en */
		test_code = TEST_CODE_HS_FREQ_RANGE_CFG;
		test_data = (mipi_hs_freq_range[i].hsfreqrange_code & 0x7f) |
		    (1 << 7);
		test_mode_send(kmb_dsi, dphy_no, test_code, test_data);
		break;
	}
}

static void dphy_init_sequence(struct kmb_dsi *kmb_dsi,
			       struct mipi_ctrl_cfg *cfg, u32 dphy_no,
			       int active_lanes, enum dphy_mode mode)
{
	u32 test_code = 0, test_data = 0, val;

	/* Set D-PHY in shutdown mode */
	/* Assert RSTZ signal */
	CLR_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, RESETZ);

	/* Assert SHUTDOWNZ signal */
	CLR_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, SHUTDOWNZ);
	val = kmb_read_mipi(kmb_dsi, DPHY_INIT_CTRL0);

	/* Init D-PHY_n
	 * Pulse testclear signal to make sure the d-phy configuration
	 * starts from a clean base
	 */
	CLR_DPHY_TEST_CTRL0(kmb_dsi, dphy_no);
	ndelay(15);
	SET_DPHY_TEST_CTRL0(kmb_dsi, dphy_no);
	ndelay(15);
	CLR_DPHY_TEST_CTRL0(kmb_dsi, dphy_no);
	ndelay(15);

	/* Set mastermacro bit - Master or slave mode */
	test_code = TEST_CODE_MULTIPLE_PHY_CTRL;

	/* DPHY has its own clock lane enabled (master) */
	if (mode == MIPI_DPHY_MASTER)
		test_data = 0x01;
	else
		test_data = 0x00;

	/* Send the test code and data */
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Set the lane data rate */
	set_lane_data_rate(kmb_dsi, dphy_no, cfg);

	/* High-Speed Tx Slew Rate Calibration
	 * BitRate: > 1.5 Gbps && <= 2.5 Gbps: slew rate control OFF
	 */
	if (cfg->lane_rate_mbps > 1500)
		set_slewrate_gt_1500(kmb_dsi, dphy_no);
	else if (cfg->lane_rate_mbps > 1000)
		set_slewrate_gt_1000(kmb_dsi, dphy_no);
	else
		set_slewrate_lt_1000(kmb_dsi, dphy_no);

	/* Set cfgclkfreqrange */
	val = (((cfg->cfg_clk_khz / 1000) - 17) * 4) & 0x3f;
	SET_DPHY_FREQ_CTRL0_3(kmb_dsi, dphy_no, val);

	/* Enable config clk for the corresponding d-phy */
	kmb_set_bit_mipi(kmb_dsi, DPHY_CFG_CLK_EN, dphy_no);

	/* PLL setup */
	if (mode == MIPI_DPHY_MASTER)
		setup_pll(kmb_dsi, dphy_no, cfg);

	/* Send NORMAL OPERATION test code */
	test_code = 0x0;
	test_data = 0x0;
	test_mode_send(kmb_dsi, dphy_no, test_code, test_data);

	/* Configure BASEDIR for data lanes
	 * NOTE: basedir only applies to LANE_0 of each D-PHY.
	 * The other lanes keep their direction based on the D-PHY type,
	 * either Rx or Tx.
	 * bits[5:0]  - BaseDir: 1 = Rx
	 * bits[9:6] - BaseDir: 0 = Tx
	 */
	kmb_write_bits_mipi(kmb_dsi, DPHY_INIT_CTRL2, 0, 9, 0x03f);
	ndelay(15);

	/* Enable CLOCK LANE
	 * Clock lane should be enabled regardless of the direction
	 * set for the D-PHY (Rx/Tx)
	 */
	kmb_set_bit_mipi(kmb_dsi, DPHY_INIT_CTRL2, 12 + dphy_no);

	/* Enable DATA LANES */
	kmb_write_bits_mipi(kmb_dsi, DPHY_ENABLE, dphy_no * 2, 2,
			    ((1 << active_lanes) - 1));

	ndelay(15);

	/* Take D-PHY out of shutdown mode */
	/* Deassert SHUTDOWNZ signal */
	SET_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, SHUTDOWNZ);
	ndelay(15);

	/* Deassert RSTZ signal */
	SET_DPHY_INIT_CTRL0(kmb_dsi, dphy_no, RESETZ);
}

static void dphy_wait_fsm(struct kmb_dsi *kmb_dsi, u32 dphy_no,
			  enum dphy_tx_fsm fsm_state)
{
	enum dphy_tx_fsm val = DPHY_TX_POWERDWN;
	int i = 0;
	int status = 1;

	do {
		test_mode_send(kmb_dsi, dphy_no, TEST_CODE_FSM_CONTROL, 0x80);

		val = GET_TEST_DOUT4_7(kmb_dsi, dphy_no);
		i++;
		if (i > TIMEOUT) {
			status = 0;
			break;
		}
	} while (val != fsm_state);

	dev_dbg(kmb_dsi->dev, "%s: dphy %d val = %x", __func__, dphy_no, val);
	dev_dbg(kmb_dsi->dev, "* DPHY %d WAIT_FSM %s *",
		dphy_no, status ? "SUCCESS" : "FAILED");
}

static void wait_init_done(struct kmb_dsi *kmb_dsi, u32 dphy_no,
			   u32 active_lanes)
{
	u32 stopstatedata = 0;
	u32 data_lanes = (1 << active_lanes) - 1;
	int i = 0;
	int status = 1;

	do {
		stopstatedata = GET_STOPSTATE_DATA(kmb_dsi, dphy_no)
				& data_lanes;

		/* TODO-need to add a time out and return failure */
		i++;

		if (i > TIMEOUT) {
			status = 0;
			dev_dbg(kmb_dsi->dev,
				"! WAIT_INIT_DONE: TIMING OUT!(err_stat=%d)",
				kmb_read_mipi(kmb_dsi, MIPI_DPHY_ERR_STAT6_7));
			break;
		}
	} while (stopstatedata != data_lanes);

	dev_dbg(kmb_dsi->dev, "* DPHY %d INIT - %s *",
		dphy_no, status ? "SUCCESS" : "FAILED");
}

static void wait_pll_lock(struct kmb_dsi *kmb_dsi, u32 dphy_no)
{
	int i = 0;
	int status = 1;

	do {
		/* TODO-need to add a time out and return failure */
		i++;
		if (i > TIMEOUT) {
			status = 0;
			dev_dbg(kmb_dsi->dev, "%s: timing out", __func__);
			break;
		}
	} while (!GET_PLL_LOCK(kmb_dsi, dphy_no));

	dev_dbg(kmb_dsi->dev, "* PLL Locked for DPHY %d - %s *",
		dphy_no, status ? "SUCCESS" : "FAILED");
}

static u32 mipi_tx_init_dphy(struct kmb_dsi *kmb_dsi,
			     struct mipi_ctrl_cfg *cfg)
{
	u32 dphy_no = MIPI_DPHY6;

	/* Multiple D-PHYs needed */
	if (cfg->active_lanes > MIPI_DPHY_D_LANES) {
		/*
		 *Initialization for Tx aggregation mode is done according to
		 *a. start init PHY1
		 *b. poll for PHY1 FSM state LOCK
		 *   b1. reg addr 0x03[3:0] - state_main[3:0] == 5 (LOCK)
		 *c. poll for PHY1 calibrations done :
		 *   c1. termination calibration lower section: addr 0x22[5]
		 *   - rescal_done
		 *   c2. slewrate calibration (if data rate < = 1500 Mbps):
		 *     addr 0xA7[3:2] - srcal_done, sr_finished
		 *d. start init PHY0
		 *e. poll for PHY0 stopstate
		 *f. poll for PHY1 stopstate
		 */
		/* PHY #N+1 ('slave') */

		dphy_init_sequence(kmb_dsi, cfg, dphy_no + 1,
				   (cfg->active_lanes - MIPI_DPHY_D_LANES),
				   MIPI_DPHY_SLAVE);
		dphy_wait_fsm(kmb_dsi, dphy_no + 1, DPHY_TX_LOCK);

		/* PHY #N master */
		dphy_init_sequence(kmb_dsi, cfg, dphy_no, MIPI_DPHY_D_LANES,
				   MIPI_DPHY_MASTER);

		/* Wait for DPHY init to complete */
		wait_init_done(kmb_dsi, dphy_no, MIPI_DPHY_D_LANES);
		wait_init_done(kmb_dsi, dphy_no + 1,
			       cfg->active_lanes - MIPI_DPHY_D_LANES);
		wait_pll_lock(kmb_dsi, dphy_no);
		wait_pll_lock(kmb_dsi, dphy_no + 1);
		dphy_wait_fsm(kmb_dsi, dphy_no, DPHY_TX_IDLE);
	} else {		/* Single DPHY */
		dphy_init_sequence(kmb_dsi, cfg, dphy_no, cfg->active_lanes,
				   MIPI_DPHY_MASTER);
		dphy_wait_fsm(kmb_dsi, dphy_no, DPHY_TX_IDLE);
		wait_init_done(kmb_dsi, dphy_no, cfg->active_lanes);
		wait_pll_lock(kmb_dsi, dphy_no);
	}

	return 0;
}

static void connect_lcd_to_mipi(struct kmb_dsi *kmb_dsi)
{
	struct regmap *msscam;

	msscam = syscon_regmap_lookup_by_compatible("intel,keembay-msscam");
	if (IS_ERR(msscam)) {
		dev_dbg(kmb_dsi->dev, "failed to get msscam syscon");
		return;
	}

	/* DISABLE MIPI->CIF CONNECTION */
	regmap_write(msscam, MSS_MIPI_CIF_CFG, 0);

	/* ENABLE LCD->MIPI CONNECTION */
	regmap_write(msscam, MSS_LCD_MIPI_CFG, 1);
	/* DISABLE LCD->CIF LOOPBACK */
	regmap_write(msscam, MSS_LOOPBACK_CFG, 1);
}

int kmb_dsi_mode_set(struct kmb_dsi *kmb_dsi, struct drm_display_mode *mode,
		     int sys_clk_mhz)
{
	u64 data_rate;

	kmb_dsi->sys_clk_mhz = sys_clk_mhz;
	mipi_tx_init_cfg.active_lanes = MIPI_TX_ACTIVE_LANES;

	mipi_tx_frame0_sect_cfg.width_pixels = mode->crtc_hdisplay;
	mipi_tx_frame0_sect_cfg.height_lines = mode->crtc_vdisplay;
	mipitx_frame0_cfg.vsync_width =
		mode->crtc_vsync_end - mode->crtc_vsync_start;
	mipitx_frame0_cfg.v_backporch =
		mode->crtc_vtotal - mode->crtc_vsync_end;
	mipitx_frame0_cfg.v_frontporch =
		mode->crtc_vsync_start - mode->crtc_vdisplay;
	mipitx_frame0_cfg.hsync_width =
		mode->crtc_hsync_end - mode->crtc_hsync_start;
	mipitx_frame0_cfg.h_backporch =
		mode->crtc_htotal - mode->crtc_hsync_end;
	mipitx_frame0_cfg.h_frontporch =
		mode->crtc_hsync_start - mode->crtc_hdisplay;

	/* Lane rate = (vtotal*htotal*fps*bpp)/4 / 1000000
	 * to convert to Mbps
	 */
	data_rate = ((((u32)mode->crtc_vtotal *	(u32)mode->crtc_htotal) *
			(u32)(drm_mode_vrefresh(mode)) *
			MIPI_TX_BPP) / mipi_tx_init_cfg.active_lanes) /	1000000;

	dev_dbg(kmb_dsi->dev, "data_rate=%u active_lanes=%d\n",
		(u32)data_rate, mipi_tx_init_cfg.active_lanes);

	/* When late rate < 800, modeset fails with 4 lanes,
	 * so switch to 2 lanes
	 */
	if (data_rate < 800) {
		mipi_tx_init_cfg.active_lanes = 2;
		mipi_tx_init_cfg.lane_rate_mbps = data_rate * 2;
	} else {
		mipi_tx_init_cfg.lane_rate_mbps = data_rate;
	}

	kmb_write_mipi(kmb_dsi, DPHY_ENABLE, 0);
	kmb_write_mipi(kmb_dsi, DPHY_INIT_CTRL0, 0);
	kmb_write_mipi(kmb_dsi, DPHY_INIT_CTRL1, 0);
	kmb_write_mipi(kmb_dsi, DPHY_INIT_CTRL2, 0);

	/* Initialize mipi controller */
	mipi_tx_init_cntrl(kmb_dsi, &mipi_tx_init_cfg);

	/* Dphy initialization */
	mipi_tx_init_dphy(kmb_dsi, &mipi_tx_init_cfg);

	connect_lcd_to_mipi(kmb_dsi);
	dev_info(kmb_dsi->dev, "mipi hw initialized");

	return 0;
}

struct kmb_dsi *kmb_dsi_init(struct platform_device *pdev)
{
	struct kmb_dsi *kmb_dsi;
	struct device *dev = get_device(&pdev->dev);

	kmb_dsi = devm_kzalloc(dev, sizeof(*kmb_dsi), GFP_KERNEL);
	if (!kmb_dsi) {
		dev_err(dev, "failed to allocate kmb_dsi\n");
		return ERR_PTR(-ENOMEM);
	}

	kmb_dsi->host = dsi_host;
	kmb_dsi->host->ops = &kmb_dsi_host_ops;

	dsi_device->host = kmb_dsi->host;
	kmb_dsi->device = dsi_device;

	return kmb_dsi;
}

int kmb_dsi_encoder_init(struct drm_device *dev, struct kmb_dsi *kmb_dsi)
{
	struct drm_encoder *encoder;
	struct drm_connector *connector;
	int ret = 0;

	encoder = &kmb_dsi->base;
	encoder->possible_crtcs = 1;
	encoder->possible_clones = 0;

	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DSI);
	if (ret) {
		dev_err(kmb_dsi->dev, "Failed to init encoder %d\n", ret);
		return ret;
	}

	/* Link drm_bridge to encoder */
	ret = drm_bridge_attach(encoder, adv_bridge, NULL,
				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
	if (ret) {
		DRM_ERROR("failed to attach bridge to MIPI\n");
		drm_encoder_cleanup(encoder);
		return ret;
	}
	drm_info(dev, "Bridge attached : SUCCESS");
	connector = drm_bridge_connector_init(dev, encoder);
	if (IS_ERR(connector)) {
		DRM_ERROR("Unable to create bridge connector");
		drm_encoder_cleanup(encoder);
		return PTR_ERR(connector);
	}
	drm_connector_attach_encoder(connector, encoder);
	return 0;
}

int kmb_dsi_map_mmio(struct kmb_dsi *kmb_dsi)
{
	struct resource *res;
	struct device *dev = kmb_dsi->dev;

	res = platform_get_resource_byname(kmb_dsi->pdev, IORESOURCE_MEM,
					   "mipi");
	if (!res) {
		dev_err(dev, "failed to get resource for mipi");
		return -ENOMEM;
	}
	kmb_dsi->mipi_mmio = devm_ioremap_resource(dev, res);
	if (IS_ERR(kmb_dsi->mipi_mmio)) {
		dev_err(dev, "failed to ioremap mipi registers");
		return PTR_ERR(kmb_dsi->mipi_mmio);
	}
	return 0;
}

static int kmb_dsi_clk_enable(struct kmb_dsi *kmb_dsi)
{
	int ret;
	struct device *dev = kmb_dsi->dev;

	ret = clk_prepare_enable(kmb_dsi->clk_mipi);
	if (ret) {
		dev_err(dev, "Failed to enable MIPI clock: %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(kmb_dsi->clk_mipi_ecfg);
	if (ret) {
		dev_err(dev, "Failed to enable MIPI_ECFG clock: %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(kmb_dsi->clk_mipi_cfg);
	if (ret) {
		dev_err(dev, "Failed to enable MIPI_CFG clock: %d\n", ret);
		return ret;
	}

	dev_info(dev, "SUCCESS : enabled MIPI clocks\n");
	return 0;
}

int kmb_dsi_clk_init(struct kmb_dsi *kmb_dsi)
{
	struct device *dev = kmb_dsi->dev;
	unsigned long clk;

	kmb_dsi->clk_mipi = devm_clk_get(dev, "clk_mipi");
	if (IS_ERR(kmb_dsi->clk_mipi)) {
		dev_err(dev, "devm_clk_get() failed clk_mipi\n");
		return PTR_ERR(kmb_dsi->clk_mipi);
	}

	kmb_dsi->clk_mipi_ecfg = devm_clk_get(dev, "clk_mipi_ecfg");
	if (IS_ERR(kmb_dsi->clk_mipi_ecfg)) {
		dev_err(dev, "devm_clk_get() failed clk_mipi_ecfg\n");
		return PTR_ERR(kmb_dsi->clk_mipi_ecfg);
	}

	kmb_dsi->clk_mipi_cfg = devm_clk_get(dev, "clk_mipi_cfg");
	if (IS_ERR(kmb_dsi->clk_mipi_cfg)) {
		dev_err(dev, "devm_clk_get() failed clk_mipi_cfg\n");
		return PTR_ERR(kmb_dsi->clk_mipi_cfg);
	}
	/* Set MIPI clock to 24 Mhz */
	clk_set_rate(kmb_dsi->clk_mipi, KMB_MIPI_DEFAULT_CLK);
	if (clk_get_rate(kmb_dsi->clk_mipi) != KMB_MIPI_DEFAULT_CLK) {
		dev_err(dev, "failed to set to clk_mipi to %d\n",
			KMB_MIPI_DEFAULT_CLK);
		return -1;
	}
	dev_dbg(dev, "clk_mipi = %ld\n", clk_get_rate(kmb_dsi->clk_mipi));

	clk = clk_get_rate(kmb_dsi->clk_mipi_ecfg);
	if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
		/* Set MIPI_ECFG clock to 24 Mhz */
		clk_set_rate(kmb_dsi->clk_mipi_ecfg, KMB_MIPI_DEFAULT_CFG_CLK);
		clk = clk_get_rate(kmb_dsi->clk_mipi_ecfg);
		if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
			dev_err(dev, "failed to set to clk_mipi_ecfg to %d\n",
				KMB_MIPI_DEFAULT_CFG_CLK);
			return -1;
		}
	}

	clk = clk_get_rate(kmb_dsi->clk_mipi_cfg);
	if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
		/* Set MIPI_CFG clock to 24 Mhz */
		clk_set_rate(kmb_dsi->clk_mipi_cfg, 24000000);
		clk = clk_get_rate(kmb_dsi->clk_mipi_cfg);
		if (clk != KMB_MIPI_DEFAULT_CFG_CLK) {
			dev_err(dev, "failed to set clk_mipi_cfg to %d\n",
				KMB_MIPI_DEFAULT_CFG_CLK);
			return -1;
		}
	}

	return kmb_dsi_clk_enable(kmb_dsi);
}