src/soc/qualcomm/sc7180/display/dsi_phy.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <console/console.h>
#include <delay.h>
#include <device/mmio.h>
#include <edid.h>
#include <lib.h>
#include <soc/clock.h>
#include <soc/display/dsi_phy.h>
#include <soc/display/mdssreg.h>
#include <soc/display/display_resources.h>
#include <string.h>
#include <timer.h>

#define HAL_DSI_PHY_PLL_READY_TIMEOUT_MS               150           /* ~15 ms */
#define HAL_DSI_PHY_REFGEN_TIMEOUT_MS                  150           /* ~15 ms */

#define DSI_MAX_REFRESH_RATE       95
#define DSI_MIN_REFRESH_RATE       15

#define HAL_DSI_PLL_VCO_MIN_MHZ_2_2_0               1000

#define S_DIV_ROUND_UP(n, d)	\
	(((n) >= 0) ? (((n) + (d) - 1) / (d)) : (((n) - (d) + 1) / (d)))

#define mult_frac(x, numer, denom)(			\
{							\
	typeof(x) quot = (x) / (denom);			\
	typeof(x) rem  = (x) % (denom);			\
	(quot * (numer)) + ((rem * (numer)) / (denom));	\
}							\
)

struct dsi_phy_divider_lut_entry_type {
	uint16_t        pll_post_div;
	uint16_t        phy_post_div;
};

/* PLL divider LUTs */
static struct dsi_phy_divider_lut_entry_type pll_dividerlut_dphy[] = {
/* pll post div will always be power of 2 */
	{ 2, 11 },
	{ 4, 5 },
	{ 2, 9 },
	{ 8, 2 },
	{ 1, 15 },
	{ 2, 7 },
	{ 1, 13 },
	{ 4, 3 },
	{ 1, 11 },
	{ 2, 5 },
	{ 1, 9 },
	{ 8, 1 },
	{ 1, 7 },
	{ 2, 3 },
	{ 1, 5 },
	{ 4, 1 },
	{ 1, 3 },
	{ 2, 1 },
	{ 1, 1 }
};

enum dsi_laneid_type {
	DSI_LANEID_0 = 0,
	DSI_LANEID_1,
	DSI_LANEID_2,
	DSI_LANEID_3,
	DSI_LANEID_CLK,
	DSI_LANEID_MAX,
	DSI_LANEID_FORCE_32BIT = 0x7FFFFFFF
};

struct dsi_phy_configtype {
	uint32_t desired_bitclk_freq;
	uint32_t bits_per_pixel;
	uint32_t num_data_lanes;
	uint32_t pclk_divnumerator;
	uint32_t pclk_divdenominator;

	/* pixel clk source select */
	uint32_t phy_post_div;
	uint32_t pll_post_div;
};

static inline s32 linear_inter(s32 tmax, s32 tmin, s32 percent,
				s32 min_result, bool even)
{
	s32 v;

	v = (tmax - tmin) * percent;
	v = S_DIV_ROUND_UP(v, 100) + tmin;
	if (even && (v & 0x1))
		return MAX(min_result, v - 1);

	return MAX(min_result, v);
}

static void mdss_dsi_phy_reset(void)
{
	write32(&dsi0_phy->phy_cmn_ctrl1, 0x40);
	udelay(100);
	write32(&dsi0_phy->phy_cmn_ctrl1, 0x0);
}

static void mdss_dsi_power_down(void)
{
	/* power up DIGTOP & PLL */
	write32(&dsi0_phy->phy_cmn_ctrl0, 0x60);

	/* Disable PLL */
	write32(&dsi0_phy->phy_cmn_pll_ctrl, 0x0);

	/* Resync re-time FIFO OFF*/
	write32(&dsi0_phy->phy_cmn_rbuf_ctrl, 0x0);
}

static void mdss_dsi_phy_setup_lanephy(enum dsi_laneid_type lane)
{
	uint32_t reg_val = 0;
	uint32_t lprx_ctrl = 0;
	uint32_t hstx_strength = 0x88;
	uint32_t data_strength_lp_n = 0x5;
	uint32_t data_strength_lp_p = 0x5;
	uint32_t pemph_bottom = 0;
	uint32_t pemph_top = 0;
	uint32_t strength_override = 0;
	uint32_t clk_lane = 0;

	if (lane == DSI_LANEID_CLK)
		clk_lane = 1;
	else
		clk_lane = 0;

	if (lane == DSI_LANEID_0)
		lprx_ctrl = 3;

	/*
	 * DSIPHY_STR_LP_N
	 * DSIPHY_STR_LP_P
	 */
	reg_val = ((data_strength_lp_n << 0x4) & 0xf0) |
		   (data_strength_lp_p & 0x0f);

	write32(&dsi0_phy->phy_ln_regs[lane].dln0_lptx_str_ctrl, reg_val);

	/*
	 * DSIPHY_LPRX_EN
	 * DSIPHY_CDRX_EN
	 * Transition from 0 to 1 for DLN0-3 CLKLN stays 0
	 */
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_lprx_ctrl, 0x0);
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_lprx_ctrl, lprx_ctrl);

	/* Pin Swap */
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_pin_swap, 0x0);

	/*
	 * DSIPHY_HSTX_STR_HSTOP
	 * DSIPHY_HSTX_STR_HSBOT
	 */
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_hstx_str_ctrl, hstx_strength);

	/* PGM Delay */
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_cfg[0], 0x0);

	/* DLN0_CFG1 */
	reg_val = (strength_override << 0x5) & 0x20;
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_cfg[1], reg_val);

	/* DLN0_CFG2 */
	reg_val = ((pemph_bottom << 0x04) & 0xf0) |
		   (pemph_top & 0x0f);

	write32(&dsi0_phy->phy_ln_regs[lane].dln0_cfg[2], reg_val);
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_offset_top_ctrl, 0x0);
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_offset_bot_ctrl, 0x0);

	/*
	 * DSIPHY_LPRX_DLY
	 * IS_CKLANE
	 */
	reg_val = (clk_lane << 0x07) & 0x80;
	write32(&dsi0_phy->phy_ln_regs[lane].dln0_cfg[3], reg_val);

	reg_val = 0;
	if (lane == DSI_LANEID_CLK)
		reg_val = 1;

	write32(&dsi0_phy->phy_ln_regs[lane].dln0_tx_dctrl, reg_val);
}

static void mdss_dsi_calculate_phy_timings(struct msm_dsi_phy_ctrl *timing,
					   struct dsi_phy_configtype *phy_cfg)
{
	const unsigned long bit_rate = phy_cfg->desired_bitclk_freq;
	s32 ui, ui_x8;
	s32 tmax, tmin;
	s32 pcnt0 = 50;
	s32 pcnt1 = 50;
	s32 pcnt2 = 10;
	s32 pcnt3 = 30;
	s32 pcnt4 = 10;
	s32 pcnt5 = 2;
	s32 coeff = 1000; /* Precision, should avoid overflow */
	s32 hb_en, hb_en_ckln;
	s32 temp;

	if (!bit_rate)
		return;

	hb_en = 0;
	timing->half_byte_clk_en = 0;
	hb_en_ckln = 0;

	ui = mult_frac(1000000, coeff, bit_rate / 1000);
	ui_x8 = ui << 3;

	temp = S_DIV_ROUND_UP(38 * coeff, ui_x8);
	tmin = MAX(temp, 0);
	temp = (95 * coeff) / ui_x8;
	tmax = MAX(temp, 0);
	timing->clk_prepare = linear_inter(tmax, tmin, pcnt0, 0, false);

	temp = 300 * coeff - (timing->clk_prepare << 3) * ui;
	tmin = S_DIV_ROUND_UP(temp, ui_x8) - 1;
	tmax = (tmin > 255) ? 511 : 255;
	timing->clk_zero = linear_inter(tmax, tmin, pcnt5, 0, false);

	tmin = DIV_ROUND_UP(60 * coeff + 3 * ui, ui_x8);
	temp = 105 * coeff + 12 * ui - 20 * coeff;
	tmax = (temp + 3 * ui) / ui_x8;
	timing->clk_trail = linear_inter(tmax, tmin, pcnt3, 0, false);

	temp = S_DIV_ROUND_UP(40 * coeff + 4 * ui, ui_x8);
	tmin = MAX(temp, 0);
	temp = (85 * coeff + 6 * ui) / ui_x8;
	tmax = MAX(temp, 0);
	timing->hs_prepare = linear_inter(tmax, tmin, pcnt1, 0, false);

	temp = 145 * coeff + 10 * ui - (timing->hs_prepare << 3) * ui;
	tmin = S_DIV_ROUND_UP(temp, ui_x8) - 1;
	tmax = 255;
	timing->hs_zero = linear_inter(tmax, tmin, pcnt4, 0, false);

	tmin = DIV_ROUND_UP(60 * coeff + 4 * ui, ui_x8) - 1;
	temp = 105 * coeff + 12 * ui - 20 * coeff;
	tmax = (temp / ui_x8) - 1;
	timing->hs_trail = linear_inter(tmax, tmin, pcnt3, 0, false);

	temp = 50 * coeff + ((hb_en << 2) - 8) * ui;
	timing->hs_rqst = S_DIV_ROUND_UP(temp, ui_x8);

	tmin = DIV_ROUND_UP(100 * coeff, ui_x8) - 1;
	tmax = 255;
	timing->hs_exit = linear_inter(tmax, tmin, pcnt2, 0, false);

	temp = 50 * coeff + ((hb_en_ckln << 2) - 8) * ui;
	timing->hs_rqst = S_DIV_ROUND_UP(temp, ui_x8);

	temp = 60 * coeff + 52 * ui - 43 * ui;
	tmin = DIV_ROUND_UP(temp, ui_x8) - 1;
	tmax = 63;
	timing->clk_post = linear_inter(tmax, tmin, pcnt2, 0, false);

	temp = 8 * ui + (timing->clk_prepare << 3) * ui;
	temp += (((timing->clk_zero + 3) << 3) + 11) * ui;
	temp += hb_en_ckln ? (((timing->hs_rqst << 3) + 4) * ui) :
			(((timing->hs_rqst << 3) + 8) * ui);
	tmin = S_DIV_ROUND_UP(temp, ui_x8) - 1;
	tmax = 63;
	if (tmin > tmax) {
		temp = linear_inter(tmax << 1, tmin, pcnt2, 0, false);
		timing->clk_pre = temp >> 1;
		timing->clk_pre_inc_by_2 = 1;
	} else {
		timing->clk_pre = linear_inter(tmax, tmin, pcnt2, 0, false);
		timing->clk_pre_inc_by_2 = 0;
	}

	timing->ta_go = 3;
	timing->ta_sure = 0;
	timing->ta_get = 4;

	printk(BIOS_INFO, "PHY timings: %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d\n",
		timing->clk_pre, timing->clk_post,
		timing->clk_pre_inc_by_2, timing->clk_zero,
		timing->clk_trail, timing->clk_prepare, timing->hs_exit,
		timing->hs_zero, timing->hs_prepare, timing->hs_trail,
		timing->hs_rqst);
}

static enum cb_err mdss_dsi_phy_timings(struct msm_dsi_phy_ctrl *phy_timings)
{
	uint32_t reg_val = 0;

	/*
	 * Step 4 Common block including GlobalTiming Parameters
	 * BYTECLK_SEL
	 */
	reg_val = (0x02 << 3) & 0x18;
	write32(&dsi0_phy->phy_cmn_glbl_ctrl, reg_val);

	/* VREG_CTRL */
	write32(&dsi0_phy->phy_cmn_vreg_ctrl, 0x59);

	/*HALFBYTECLK_EN*/
	write32(&dsi0_phy->phy_cmn_timing_ctrl[0], phy_timings->half_byte_clk_en);

	/* T_CLK_ZERO */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[1], phy_timings->clk_zero);

	/* T_CLK_PREPARE */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[2], phy_timings->clk_prepare);

	/* T_CLK_TRAIL */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[3], phy_timings->clk_trail);

	/* T_HS_EXIT */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[4], phy_timings->hs_exit);

	/* T_HS_ZERO */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[5], phy_timings->hs_zero);

	/* T_HS_PREPARE */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[6], phy_timings->hs_prepare);

	/* T_HS_TRAIL */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[7], phy_timings->hs_trail);

	/* T_HS_RQST */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[8], phy_timings->hs_rqst);

	/* T_TA_GO & T_TA_SURE */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[9],
			phy_timings->ta_sure << 3 | phy_timings->ta_go);

	/* T_TA_GET */
	write32(&dsi0_phy->phy_cmn_timing_ctrl[10], phy_timings->ta_get);

	/*DSIPHY_TRIG3_CMD*/
	write32(&dsi0_phy->phy_cmn_timing_ctrl[11], 0x0);

	/* DSI clock out timing ctrl T_CLK_PRE & T_CLK_POST*/
	reg_val = ((phy_timings->clk_post << 8) | phy_timings->clk_pre);
	write32(&dsi0->clkout_timing_ctrl, reg_val);

	/* DCTRL */
	write32(&dsi0_phy->phy_cmn_ctrl2, 0x40);

	return CB_SUCCESS;
}

static enum cb_err dsi_phy_waitforrefgen(void)
{
	uint32_t timeout = HAL_DSI_PHY_REFGEN_TIMEOUT_MS;
	uint32_t refgen  = 0;
	enum cb_err ret = CB_SUCCESS;

	while (!refgen) {
		refgen = (read32(&dsi0_phy->phy_cmn_phy_status) & 0x1);
		if (!refgen) {
			udelay(100);
			timeout--;
			if (!timeout) {
				/* timeout while polling the lock status */
				ret = CB_ERR;
				break;
			}
		}
	}

	return ret;
}

static enum cb_err mdss_dsi_phy_commit(void)
{
	enum cb_err ret = CB_SUCCESS;

	ret = dsi_phy_waitforrefgen();
	if (ret) {
		printk(BIOS_ERR, "%s: waitforrefgen error\n", __func__);
		return ret;
	}

	mdss_dsi_power_down();

	/* Remove PLL, DIG and all lanes from pwrdn */
	write32(&dsi0_phy->phy_cmn_ctrl0, 0x7F);

	/* Lane enable */
	write32(&dsi0_phy->phy_cmn_dsi_lane_ctrl0, 0x1F);

	mdss_dsi_phy_setup_lanephy(DSI_LANEID_0);
	mdss_dsi_phy_setup_lanephy(DSI_LANEID_1);
	mdss_dsi_phy_setup_lanephy(DSI_LANEID_2);
	mdss_dsi_phy_setup_lanephy(DSI_LANEID_3);
	mdss_dsi_phy_setup_lanephy(DSI_LANEID_CLK);

	return ret;
}

static void mdss_dsi_phy_setup(void)
{
	/* First reset phy */
	mdss_dsi_phy_reset();

	/* commit phy settings */
	mdss_dsi_phy_commit();
}

static void dsi_phy_resync_fifo(void)
{
	/* Resync FIFO*/
	write32(&dsi0_phy->phy_cmn_rbuf_ctrl, 0x1);
}

static void dsi_phy_pll_global_clk_enable(bool enable)
{
	uint32_t clk_cfg = read32(&dsi0_phy->phy_cmn_clk_cfg1);
	uint32_t clk_enable = 0;

	/* Set CLK_EN */
	if (enable)
		clk_enable = 1;

	clk_cfg &= ~0x20;
	clk_cfg |= ((clk_enable << 0x5) & 0x20);

	/* clk cfg1 */
	write32(&dsi0_phy->phy_cmn_clk_cfg1, clk_cfg);
}

static enum cb_err dsi_phy_pll_lock_detect(void)
{
	enum cb_err ret = CB_SUCCESS;

	/* Enable PLL */
	write32(&dsi0_phy->phy_cmn_pll_ctrl, 0x1);

	/* Wait for Lock */
	if (!wait_us(15000, read32(&phy_pll_qlink->pll_common_status_one) & 0x1)) {
		/* timeout while polling the lock status */
		ret = CB_ERR;
		printk(BIOS_ERR, "dsi pll lock detect timedout, error.\n");
	}

	return ret;
}

static void dsi_phy_toggle_dln3_tx_dctrl(void)
{
	uint32_t reg_val = 0;

	reg_val = read32(&dsi0_phy->phy_ln_regs[DSI_LANEID_3].dln0_tx_dctrl);

	/* clear bit 0 and keep all other bits including bit 2 */
	reg_val &= ~0x01;

	/* toggle bit 0 */
	write32(&dsi0_phy->phy_ln_regs[DSI_LANEID_3].dln0_tx_dctrl, (0x01 | reg_val));
	write32(&dsi0_phy->phy_ln_regs[DSI_LANEID_3].dln0_tx_dctrl, 0x4);
}

static void dsi_phy_pll_set_source(void)
{
	uint32_t clk_cfg = read32(&dsi0_phy->phy_cmn_clk_cfg1);
	uint32_t dsi_clksel = 1;

	clk_cfg &= ~0x03;
	clk_cfg |= ((dsi_clksel) & 0x3);

	/* clk cfg1 */
	write32(&dsi0_phy->phy_cmn_clk_cfg1, clk_cfg);
}

static void dsi_phy_pll_bias_enable(bool enable)
{
	uint32_t reg_val = 0;

	/* Set BIAS_EN_MUX, BIAS_EN */
	if (enable)
		reg_val = (0x01 << 6) | (0x01 << 7);

	/* pll system muxes */
	write32(&phy_pll_qlink->pll_system_muxes, reg_val);

}

static void dsi_phy_mnd_divider(struct dsi_phy_configtype *phy_cfg)
{
	uint32_t m_val = 1;
	uint32_t n_val = 1;

	if (phy_cfg->bits_per_pixel == 18) {
		switch (phy_cfg->num_data_lanes) {
		case 1:
		case 2:
			m_val = 2;
			n_val = 3;
			break;
		case 4:
			m_val = 4;
			n_val = 9;
			break;
		default:
			break;
		}
	} else if ((phy_cfg->bits_per_pixel == 16) &&
			(phy_cfg->num_data_lanes == 3)) {
		m_val = 3;
		n_val = 8;
	} else if ((phy_cfg->bits_per_pixel == 30) &&
			(phy_cfg->num_data_lanes == 4)) {
		m_val = 2;
		n_val = 3;
	}

	/*Save M/N info */
	phy_cfg->pclk_divnumerator = m_val;
	phy_cfg->pclk_divdenominator = n_val;
}

static uint32_t dsi_phy_dsiclk_divider(struct dsi_phy_configtype *phy_cfg)
{
	uint32_t m_val = phy_cfg->pclk_divnumerator;
	uint32_t n_val = phy_cfg->pclk_divdenominator;
	uint32_t div_ctrl = 0;

	div_ctrl = (m_val * phy_cfg->bits_per_pixel) /
	       (n_val * phy_cfg->num_data_lanes * 2);

	return div_ctrl;
}


static unsigned long dsi_phy_calc_clk_divider(struct dsi_phy_configtype *phy_cfg)
{
	bool div_found = false;
	uint32_t m_val = 1;
	uint32_t n_val = 1;
	uint32_t div_ctrl = 0;
	uint32_t reg_val = 0;
	uint32_t pll_post_div = 0;
	uint32_t phy_post_div = 0;
	uint64_t vco_freq_hz = 0;
	uint64_t fval = 0;
	uint64_t pll_output_freq_hz;
	uint64_t desired_bitclk_hz;
	uint64_t min_vco_freq_hz = 0;
	uint32_t lut_max;
	int i;
	struct dsi_phy_divider_lut_entry_type *lut;

	/* use 1000Mhz */
	min_vco_freq_hz = (HAL_DSI_PLL_VCO_MIN_MHZ_2_2_0 * 1000000);

	dsi_phy_mnd_divider(phy_cfg);

	m_val = phy_cfg->pclk_divnumerator;
	n_val = phy_cfg->pclk_divdenominator;

	/* Desired clock in MHz */
	desired_bitclk_hz = (uint64_t)phy_cfg->desired_bitclk_freq;

	/* D Phy */
	lut = pll_dividerlut_dphy;
	lut_max = ARRAY_SIZE(pll_dividerlut_dphy);
	lut += (lut_max - 1);

	/* PLL Post Div - from LUT
	 * Check the LUT in reverse order
	 */
	for (i = lut_max - 1; i >= 0; i--, lut--) {
		fval = (uint64_t)lut->phy_post_div *
				(uint64_t)lut->pll_post_div;
		if (fval) {
			if ((desired_bitclk_hz * fval) > min_vco_freq_hz) {
				/* Range found */
				pll_post_div = lut->pll_post_div;
				phy_post_div = lut->phy_post_div;
				div_found = true;
				break;
			}
		}
	}

	if (div_found) {
		phy_cfg->pll_post_div = pll_post_div;
		phy_cfg->phy_post_div = phy_post_div;

		/*div_ctrl_7_4 */
		div_ctrl = dsi_phy_dsiclk_divider(phy_cfg);

		/* DIV_CTRL_7_4 DIV_CTRL_3_0
		 * (DIV_CTRL_3_0 = PHY post divider ratio)
		 */
		reg_val = (div_ctrl << 0x04) & 0xf0;
		reg_val |= (phy_post_div & 0x0f);
		write32(&dsi0_phy->phy_cmn_clk_cfg0, reg_val);

		/* PLL output frequency = desired_bitclk_hz * phy_post_div */
		pll_output_freq_hz = desired_bitclk_hz * phy_post_div;

		/* VCO output freq*/
		vco_freq_hz = pll_output_freq_hz * pll_post_div;

	}

	return (unsigned long)vco_freq_hz;
}

static void dsi_phy_pll_outputdiv_rate(struct dsi_phy_configtype *pll_cfg)
{
	/* Output divider */
	uint32_t pll_post_div = 0;
	uint32_t reg_val = 0;

	pll_post_div = log2(pll_cfg->pll_post_div);
	reg_val = pll_post_div & 0x3;
	write32(&phy_pll_qlink->pll_outdiv_rate, reg_val);
}

static enum cb_err dsi_phy_pll_calcandcommit(struct dsi_phy_configtype *phy_cfg)
{
	unsigned long vco_freq_hz;
	enum cb_err ret = CB_SUCCESS;

	/* validate input parameters */
	if (!phy_cfg) {
		return CB_ERR;
	} else if ((phy_cfg->bits_per_pixel != 16) &&
		   (phy_cfg->bits_per_pixel != 18) &&
		   (phy_cfg->bits_per_pixel != 24)) {
		/* Unsupported pixel bit depth */
		return CB_ERR;
	} else if ((phy_cfg->num_data_lanes == 0) ||
		   (phy_cfg->num_data_lanes > 4)) {
		/* Illegal number of DSI data lanes */
		return CB_ERR;
	}

	vco_freq_hz = dsi_phy_calc_clk_divider(phy_cfg);
	if (!vco_freq_hz) {
		/* bitclock too low  - unsupported */
		printk(BIOS_ERR, "vco_freq_hz is 0, unsupported\n");
		return CB_ERR;
	}

	/* Enable PLL bias */
	dsi_phy_pll_bias_enable(true);

	/* Set byte clk source */
	dsi_phy_pll_set_source();

	dsi_phy_pll_outputdiv_rate(phy_cfg);
	dsi_phy_pll_vco_10nm_set_rate(vco_freq_hz);
	dsi_phy_toggle_dln3_tx_dctrl();

	/* Steps 6,7 Start PLL & Lock */
	if (ret == CB_SUCCESS)
		ret = dsi_phy_pll_lock_detect();

	/* Step 8 - Resync Data Paths */
	if (ret == CB_SUCCESS) {
		/* Global clock enable */
		dsi_phy_pll_global_clk_enable(true);

		/* Resync FIFOs */
		dsi_phy_resync_fifo();
	}

	return ret;
}

static uint32_t dsi_calc_desired_bitclk(struct edid *edid, uint32_t num_lines, uint32_t bpp)
{
	uint64_t desired_bclk = 0;
	uint32_t pixel_clock_in_hz;

	pixel_clock_in_hz = edid->mode.pixel_clock * KHz;
	if (num_lines) {
		desired_bclk = pixel_clock_in_hz * (uint64_t)bpp;
		desired_bclk = desired_bclk/(uint64_t)(num_lines);
	}

	printk(BIOS_INFO, "Desired bitclock: %uHz\n", (uint32_t)desired_bclk);
	return (uint32_t)desired_bclk;
}

static enum cb_err mdss_dsi_phy_pll_setup(struct edid *edid,
					  uint32_t num_of_lanes, uint32_t bpp)
{
	struct dsi_phy_configtype phy_cfg;
	struct msm_dsi_phy_ctrl phy_timings;
	enum cb_err ret;

	/* Setup the PhyStructure */
	memset(&phy_cfg, 0, sizeof(struct dsi_phy_configtype));
	memset(&phy_timings, 0, sizeof(struct msm_dsi_phy_ctrl));

	phy_cfg.bits_per_pixel = bpp;
	phy_cfg.num_data_lanes = num_of_lanes;

	/* desired DSI PLL bit clk freq in Hz */
	phy_cfg.desired_bitclk_freq = dsi_calc_desired_bitclk(edid, num_of_lanes, bpp);

	ret = dsi_phy_pll_calcandcommit(&phy_cfg);
	if (ret)
		return ret;
	mdss_dsi_calculate_phy_timings(&phy_timings, &phy_cfg);
	ret = mdss_dsi_phy_timings(&phy_timings);

	return ret;
}

static enum cb_err enable_dsi_clk(void)
{
	enum cb_err ret;
	uint32_t i = 0;
	struct mdp_external_clock_entry clks[] = {
		{.clk_type = MDSS_CLK_ESC0, .clk_secondary_source = 1},
		{.clk_type = MDSS_CLK_PCLK0, .clk_source = 1},
		{.clk_type = MDSS_CLK_BYTE0, .clk_source = 1},
		{.clk_type = MDSS_CLK_BYTE0_INTF, .clk_source = 1,
				.clk_div = 2, .source_div = 2},
	};

	for (i = 0; i < ARRAY_SIZE(clks); i++) {
		/* Set Ext Source */
		ret = mdss_clock_configure(clks[i].clk_type,
				   clks[i].clk_source,
				   clks[i].clk_div,
				   clks[i].clk_pll_m,
				   clks[i].clk_pll_n,
				   clks[i].clk_pll_2d);
		if (ret) {
			printk(BIOS_ERR,
			       "mdss_clock_configure failed for %u\n",
			       clks[i].clk_type);
			return CB_ERR;
		}

		ret = mdss_clock_enable(clks[i].clk_type);
		if (ret) {
			printk(BIOS_ERR,
			       "mdss_clock_enable failed for %u\n",
			       clks[i].clk_type);
			return CB_ERR;
		}
	}

	return ret;
}

enum cb_err mdss_dsi_phy_10nm_init(struct edid *edid, uint32_t num_of_lanes, uint32_t bpp)
{
	enum cb_err ret;

	/* Phy set up */
	mdss_dsi_phy_setup();
	ret = mdss_dsi_phy_pll_setup(edid, num_of_lanes, bpp);
	enable_dsi_clk();

	return ret;
}