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Commit 6c9c1d9d authored by Kuogee Hsieh's avatar Kuogee Hsieh Committed by Narendra Muppalla
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msm: mdss: add 8996 dsi pll support 



Implement dsi related clocks framework so that dsi
vco pll related function be called to output correct
vco rate base on byte clock rate. After that pixel
clock rate can be achieved through MND setting.

Change-Id: I819f9fcb8afd9430f131679434c4da34641ce3f8
Signed-off-by: default avatarKuogee Hsieh <khsieh@codeaurora.org>
parent ffb69645

drivers/clk/qcom/mdss/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -4,6 +4,8 @@ obj-$(CONFIG_MSM_MDSS_PLL) += mdss-dsi-pll-util.o mdss-dsi-20nm-pll-util.o 
obj-$(CONFIG_MSM_MDSS_PLL) += mdss-dsi-pll-28hpm.o

obj-$(CONFIG_MSM_MDSS_PLL) += mdss-dsi-pll-28lpm.o

obj-$(CONFIG_MSM_MDSS_PLL) += mdss-dsi-pll-20nm.o

obj-$(CONFIG_MSM_MDSS_PLL) += mdss-dsi-pll-8996.o

obj-$(CONFIG_MSM_MDSS_PLL) += mdss-dsi-pll-8996-util.o

obj-$(CONFIG_MSM_MDSS_PLL) += mdss-edp-pll-28hpm.o

obj-$(CONFIG_MSM_MDSS_PLL) += mdss-hdmi-pll-28hpm.o

obj-$(CONFIG_MSM_MDSS_PLL) += mdss-hdmi-pll-20nm.o

drivers/clk/qcom/mdss/mdss-dsi-pll-8996-util.c

0 → 100644
+737 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#define pr_fmt(fmt)	"%s: " fmt, __func__



#include <linux/kernel.h>

#include <linux/err.h>

#include <linux/iopoll.h>

#include <linux/delay.h>

#include <linux/clk/msm-clock-generic.h>



#include "mdss-pll.h"

#include "mdss-dsi-pll.h"

#include "mdss-dsi-pll-8996.h"



#define DSI_PLL_POLL_MAX_READS                  15

#define DSI_PLL_POLL_TIMEOUT_US                 1000



int set_mdss_byte_mux_sel_8996(struct mux_clk *clk, int sel)

{

	return 0;

}



int get_mdss_byte_mux_sel_8996(struct mux_clk *clk)

{

	return 0;

}



int set_mdss_pixel_mux_sel_8996(struct mux_clk *clk, int sel)

{

	return 0;

}



int get_mdss_pixel_mux_sel_8996(struct mux_clk *clk)

{

	return 0;

}



int post_n1_div_set_div(struct div_clk *clk, int div)

{

	struct mdss_pll_resources *pll = clk->priv;

	struct dsi_pll_db *pdb;

	struct dsi_pll_output *pout;



	pdb = (struct dsi_pll_db *)pll->priv;

	pout = &pdb->out;



	/*

	 * postdiv = 1/2/4/8

	 * n1div = 1 - 15

	 * fot the time being, assume postdiv = 1

	 */



	/* this is for vco/bit clock */

	pout->pll_postdiv = 1;	/* fixed, divided by 1 */

	pout->pll_n1div  = div;



	pr_debug("div=%d postdiv=%x n1div=%x\n",

			div, pout->pll_postdiv, pout->pll_n1div);



	/* registers committed at pll_db_commit_8996() */



	return 0;

}



int post_n1_div_get_div(struct div_clk *clk)

{

	u32  div;

	struct mdss_pll_resources *pll = clk->priv;

	struct dsi_pll_db *pdb;

	struct dsi_pll_output *pout;



	pdb = (struct dsi_pll_db *)pll->priv;

	pout = &pdb->out;



	/*

	 * postdiv = 1/2/4/8

	 * n1div = 1 - 15

	 * fot the time being, assume postdiv = 1

	 */



	div = pout->pll_postdiv * pout->pll_n1div;



	pr_debug("div=%d postdiv=%x n1div=%x\n",

			div, pout->pll_postdiv, pout->pll_n1div);



	return div;

}



int n2_div_set_div(struct div_clk *clk, int div)

{

	int rc;

	u32 n2div;

	struct mdss_pll_resources *pll = clk->priv;

	struct dsi_pll_db *pdb;

	struct dsi_pll_output *pout;



	rc = mdss_pll_resource_enable(pll, true);

	if (rc) {

		pr_err("Failed to enable mdss dsi pll resources\n");

		return rc;

	}



	pdb = (struct dsi_pll_db *)pll->priv;

	pout = &pdb->out;



	/* this is for pixel clock */

	n2div = MDSS_PLL_REG_R(pll->pll_base, DSIPHY_CMN_CLK_CFG0);

	n2div &= ~0xf0;	/* bits 4 to 7 */

	n2div |= (div << 4);

	MDSS_PLL_REG_W(pll->pll_base, DSIPHY_CMN_CLK_CFG0, n2div);



	pout->pll_n2div = div;



	/* set dsiclk_sel=1 so that n2div *= 2 */

	MDSS_PLL_REG_W(pll->pll_base, DSIPHY_CMN_CLK_CFG1, 1);

	pr_debug("div=%d n2div=%x\n", div, n2div);



	mdss_pll_resource_enable(pll, false);



	return rc;

}



int n2_div_get_div(struct div_clk *clk)

{

	int rc;

	u32 n2div;

	struct mdss_pll_resources *pll = clk->priv;



	rc = mdss_pll_resource_enable(pll, true);

	if (rc) {

		pr_err("Failed to enable mdss dsi pll resources\n");

		return rc;

	}



	n2div = MDSS_PLL_REG_R(pll->pll_base, DSIPHY_CMN_CLK_CFG0);

	n2div >>= 4;

	n2div &= 0x0f;



	mdss_pll_resource_enable(pll, false);



	pr_debug("div=%d\n", n2div);



	return n2div;

}



static bool pll_is_pll_locked_8996(struct mdss_pll_resources *pll)

{

	u32 status;

	bool pll_locked;



	/* poll for PLL ready status */

	if (readl_poll_timeout_atomic((pll->pll_base +

			DSIPHY_PLL_RESET_SM_READY_STATUS),

			status,

			((status & BIT(5)) > 0),

			DSI_PLL_POLL_MAX_READS,

			DSI_PLL_POLL_TIMEOUT_US)) {

		pr_debug("DSI PLL status=%x failed to Lock\n", status);

		pll_locked = false;

	} else if (readl_poll_timeout_atomic((pll->pll_base +

				DSIPHY_PLL_RESET_SM_READY_STATUS),

				status,

				((status & BIT(0)) > 0),

				DSI_PLL_POLL_MAX_READS,

				DSI_PLL_POLL_TIMEOUT_US)) {

		pr_debug("DSI PLL status=%x PLl not ready\n", status);

		pll_locked = false;

	} else {

		pll_locked = true;

	}



	return pll_locked;

}



static void dsi_pll_start_8996(void __iomem *pll_base)

{

	pr_debug("start PLL at base=%p\n", pll_base);



	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_PLL_CNTRL, 1);

}



static void dsi_pll_stop_8996(void __iomem *pll_base)

{

	pr_debug("stop PLL at base=%p\n", pll_base);



	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_PLL_CNTRL, 0);

}



int dsi_pll_enable_seq_8996(struct mdss_pll_resources *pll)

{

	int rc = 0;



	if (!pll) {

		pr_err("Invalid PLL resources\n");

		return -EINVAL;

	}



	dsi_pll_start_8996(pll->pll_base);



	/*

	 * both DSIPHY_PLL_CLKBUFLR_EN and DSIPHY_CMN_GLBL_TEST_CTRL

	 * enabled at mdss_dsi_8996_phy_config()

	 */



	if (!pll_is_pll_locked_8996(pll)) {

		pr_err("DSI PLL lock failed\n");

		rc = -EINVAL;

		goto init_lock_err;

	}



	pr_debug("DSI PLL Lock success\n");



init_lock_err:

	return rc;

}



static int dsi_pll_enable(struct clk *c)

{

	int i, rc;

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);

	struct mdss_pll_resources *pll = vco->priv;



	rc = mdss_pll_resource_enable(pll, true);

	if (rc) {

		pr_err("Failed to enable mdss dsi pll resources\n");

		return rc;

	}



	/* Try all enable sequences until one succeeds */

	for (i = 0; i < vco->pll_en_seq_cnt; i++) {

		rc = vco->pll_enable_seqs[i](pll);

		pr_debug("DSI PLL %s after sequence #%d\n",

			rc ? "unlocked" : "locked", i + 1);

		if (!rc)

			break;

	}



	if (rc) {

		mdss_pll_resource_enable(pll, false);

		pr_err("DSI PLL failed to lock\n");

	} else {

		pll->pll_on = true;

	}



	return rc;

}



static void dsi_pll_disable(struct clk *c)

{

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);

	struct mdss_pll_resources *pll = vco->priv;



	if (!pll->pll_on &&

		mdss_pll_resource_enable(pll, true)) {

		pr_err("Failed to enable mdss dsi pll resources\n");

		return;

	}



	pll->handoff_resources = false;



	dsi_pll_stop_8996(pll->pll_base);



	/* stop pll output */

	MDSS_PLL_REG_W(pll->pll_base, DSIPHY_PLL_CLKBUFLR_EN, 0);



	/* stop clk */

	MDSS_PLL_REG_W(pll->pll_base, DSIPHY_CMN_GLBL_TEST_CTRL, 0);



	mdss_pll_resource_enable(pll, false);



	pll->pll_on = false;



	pr_debug("DSI PLL Disabled\n");

}



static void mdss_dsi_pll_8996_input_init(struct dsi_pll_db *pdb)

{

	pdb->in.fref = 19200000;	/* 19.2 Mhz*/

	pdb->in.fdata = 0;		/* bit clock rate */

	pdb->in.dsiclk_sel = 1;		/* 1, reg: 0x0014 */

	pdb->in.ssc_en = 0;		/* 1, reg: 0x0494, bit 0 */

	pdb->in.ldo_en = 0;		/* 0,  reg: 0x004c, bit 0 */



	/* fixed  input */

	pdb->in.refclk_dbler_en = 0;	/* 0, reg: 0x04c0, bit 1 */

	pdb->in.vco_measure_time = 5;	/* 5, unknown */

	pdb->in.kvco_measure_time = 5;	/* 5, unknown */

	pdb->in.bandgap_timer = 4;	/* 4, reg: 0x0430, bit 3 - 5 */

	pdb->in.pll_wakeup_timer = 5;	/* 5, reg: 0x043c, bit 0 - 2 */

	pdb->in.plllock_cnt = 1;	/* 1, reg: 0x0488, bit 1 - 2 */

	pdb->in.plllock_rng = 0;	/* 0, reg: 0x0488, bit 3 - 4 */

	pdb->in.ssc_center_spread = 0;	/* 0, reg: 0x0494, bit 1 */

	pdb->in.ssc_adj_per = 37;	/* 37, reg: 0x498, bit 0 - 9 */

	pdb->in.ssc_spread = 5;		/* 0.005, 5kppm */

	pdb->in.ssc_freq = 31500;	/* 31.5 khz */



	pdb->in.pll_ie_trim = 4;	/* 4, reg: 0x0400 */

	pdb->in.pll_ip_trim = 4;	/* 4, reg: 0x0404 */

	pdb->in.pll_cpcset_cur = 1;	/* 1, reg: 0x04f0, bit 0 - 2 */

	pdb->in.pll_cpmset_cur = 1;	/* 1, reg: 0x04f0, bit 3 - 5 */

	pdb->in.pll_icpmset = 4;	/* 4, reg: 0x04fc, bit 3 - 5 */

	pdb->in.pll_icpcset = 4;	/* 4, reg: 0x04fc, bit 0 - 2 */

	pdb->in.pll_icpmset_p = 0;	/* 0, reg: 0x04f4, bit 0 - 2 */

	pdb->in.pll_icpmset_m = 0;	/* 0, reg: 0x04f4, bit 3 - 5 */

	pdb->in.pll_icpcset_p = 0;	/* 0, reg: 0x04f8, bit 0 - 2 */

	pdb->in.pll_icpcset_m = 0;	/* 0, reg: 0x04f8, bit 3 - 5 */

	pdb->in.pll_lpf_res1 = 3;	/* 3, reg: 0x0504, bit 0 - 3 */

	pdb->in.pll_lpf_cap1 = 11;	/* 11, reg: 0x0500, bit 0 - 3 */

	pdb->in.pll_lpf_cap2 = 14;	/* 14, reg: 0x0500, bit 4 - 7 */

	pdb->in.pll_iptat_trim = 7;

	pdb->in.pll_c3ctrl = 2;		/* 2 */

	pdb->in.pll_r3ctrl = 1;		/* 1 */

}



static void pll_8996_dec_frac_calc(struct dsi_pll_db *pdb,

			 s64 vco_clk_rate, s64 fref)

{

	struct dsi_pll_input *pin = &pdb->in;

	struct dsi_pll_output *pout = &pdb->out;

	s64 multiplier = BIT(20);

	s64 dec_start_multiple, dec_start, pll_comp_val;

	s32 duration, div_frac_start;



	pr_debug("vco_clk_rate=%lld ref_clk_rate=%lld\n",

				vco_clk_rate, fref);



	dec_start_multiple = div_s64(vco_clk_rate * multiplier, fref);

	div_s64_rem(dec_start_multiple, multiplier, &div_frac_start);



	dec_start = div_s64(dec_start_multiple, multiplier);



	pout->dec_start = (u32)dec_start;

	pout->div_frac_start = div_frac_start;



	if (pin->plllock_cnt == 0)

		duration = 1024;

	else if (pin->plllock_cnt == 1)

		duration = 256;

	else if (pin->plllock_cnt == 2)

		duration = 128;

	else

		duration = 32;



	pll_comp_val =  duration * dec_start_multiple;

	pll_comp_val =  div_s64(pll_comp_val, multiplier);

	pll_comp_val /= 10;



	pout->plllock_cmp = (u32)pll_comp_val;



	pout->pll_txclk_en = 1;

	pout->pll_clkbuflr_en = 1;	/* right output */

	pout->cmn_ldo_cntrl = 0x1c;

}



static u32 pll_8996_kvco_slop(u32 vrate)

{

	u32 slop = 0;



	if (vrate > 1300000000 && vrate <= 1800000000)

		slop =  600;

	else if (vrate > 1800000000 && vrate < 2300000000)

		slop = 400;

	else if (vrate > 2300000000 && vrate < 2600000000)

		slop = 280;



	return slop;

}



static void pll_8996_calc_vco_count(struct dsi_pll_db *pdb,

			 s64 vco_clk_rate, s64 fref)

{

	struct dsi_pll_input *pin = &pdb->in;

	struct dsi_pll_output *pout = &pdb->out;

	s64 data;

	u32 cnt;



	data = fref * pin->vco_measure_time;

	data /= 1000000;

	data &= 0x03ff;	/* 10 bits */

	data -= 2;

	pout->pll_vco_div_ref = data;



	data = vco_clk_rate / 1000000;	/* unit is Mhz */

	data *= pin->vco_measure_time;

	data /= 10;

	pout->pll_vco_count = data; /* reg: 0x0474, 0x0478 */



	data = fref * pin->kvco_measure_time;

	data /= 1000000;

	data &= 0x03ff;	/* 10 bits */

	data -= 1;

	pout->pll_kvco_div_ref = data;



	cnt = pll_8996_kvco_slop(vco_clk_rate);

	cnt *= 2;

	cnt /= 100;

	cnt *= pin->kvco_measure_time;

	pout->pll_kvco_count = cnt;



	pout->pll_misc1 = 16;

	pout->pll_resetsm_cntrl = 0;

	pout->pll_resetsm_cntrl2 = pin->bandgap_timer << 3;

	pout->pll_resetsm_cntrl5 = pin->pll_wakeup_timer;

	pout->pll_kvco_code = 0;

}



static void pll_db_commit_common(void __iomem *pll_base,

					struct dsi_pll_db *pdb)

{

	struct dsi_pll_input *pin = &pdb->in;

	struct dsi_pll_output *pout = &pdb->out;

	char data;



	/* confgiure the non frequency dependent pll registers */

	data = 0;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_SYSCLK_EN_RESET, data);



	/* DSIPHY_PLL_CLKBUFLR_EN updated at dsi phy */



	data = pout->pll_txclk_en;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_TXCLK_EN, data);



	data = pout->pll_resetsm_cntrl;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_RESETSM_CNTRL, data);

	data = pout->pll_resetsm_cntrl2;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_RESETSM_CNTRL2, data);

	data = pout->pll_resetsm_cntrl5;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_RESETSM_CNTRL5, data);



	data = pout->pll_vco_div_ref;

	data &= 0x0ff;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_VCO_DIV_REF1, data);

	data = (pout->pll_vco_div_ref >> 8);

	data &= 0x03;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_VCO_DIV_REF2, data);



	data = pout->pll_kvco_div_ref;

	data &= 0x0ff;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_KVCO_DIV_REF1, data);

	data = (pout->pll_kvco_div_ref >> 8);

	data &= 0x03;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_KVCO_DIV_REF2, data);



	data = pout->pll_misc1;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLL_MISC1, data);



	data = pout->pll_ie_trim;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_IE_TRIM, data);



	data = pout->pll_ip_trim;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_IP_TRIM, data);



	data = ((pin->pll_cpmset_cur << 3) | pin->pll_cpcset_cur);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_CP_SET_CUR, data);



	data = ((pin->pll_icpcset_p << 3) | pin->pll_icpcset_m);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLL_ICPCSET, data);



	data = ((pin->pll_icpmset_p << 3) | pin->pll_icpcset_m);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLL_ICPMSET, data);



	data = ((pin->pll_icpmset << 3) | pin->pll_icpcset);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLL_ICP_SET, data);



	data = ((pdb->in.pll_lpf_cap2 << 4) | pdb->in.pll_lpf_cap1);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLL_LPF1, data);



	data = pout->pll_iptat_trim;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_IPTAT_TRIM, data);



	data = (pdb->in.pll_c3ctrl | (pdb->in.pll_r3ctrl << 4));

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLL_CRCTRL, data);

}



static void pll_db_commit_8996(void __iomem *pll_base,

					struct dsi_pll_db *pdb)

{

	struct dsi_pll_input *pin = &pdb->in;

	struct dsi_pll_output *pout = &pdb->out;

	char data;



	data = pout->cmn_ldo_cntrl;

	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_LDO_CNTRL, data);



	pll_db_commit_common(pll_base, pdb);



	/* de assert pll start and apply pll sw reset */

	/* stop pll */

	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_PLL_CNTRL, 0);



	/* pll sw reset */

	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_CTRL_1, 0x20);

	wmb();	/* make sure register committed */

	udelay(10);



	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_CTRL_1, 0);

	wmb();	/* make sure register committed */



	data = pdb->in.dsiclk_sel; /* set dsiclk_sel = 1  */

	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_CLK_CFG1, data);



	data = 0xff; /* data, clk, pll normal operation */

	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_CTRL_0, data);



	/* confgiure the frequency dependent pll registers */

	data = pout->dec_start;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_DEC_START, data);



	data = pout->div_frac_start;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_DIV_FRAC_START1, data);

	data = (pout->div_frac_start >> 8);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_DIV_FRAC_START2, data);

	data = (pout->div_frac_start >> 16);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_DIV_FRAC_START3, data);



	data = pout->plllock_cmp;

	data &= 0x0ff;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLLLOCK_CMP1, data);

	data = (pout->plllock_cmp >> 8);

	data &= 0x0ff;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLLLOCK_CMP2, data);

	data = (pout->plllock_cmp >> 16);

	data &= 0x03;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLLLOCK_CMP3, data);



	data = ((pin->plllock_cnt << 1) | (pin->plllock_rng << 3));

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLLLOCK_CMP_EN, data);



	data = pout->pll_vco_count;

	data &= 0x0ff;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_VCO_COUNT1, data);

	data = (pout->pll_vco_count >> 8);

	data &= 0x0ff;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_VCO_COUNT2, data);



	data = pout->pll_kvco_count;

	data &= 0x0ff;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_KVCO_COUNT1, data);

	data = (pout->pll_kvco_count >> 8);

	data &= 0x03;

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_KVCO_COUNT2, data);



	/*

	 * tx_band = pll_postdiv

	 * 0: divided by 1 <== for now

	 * 1: divided by 2

	 * 2: divided by 4

	 * 3: divided by 8

	 */

	data = (((pout->pll_postdiv - 1) << 4) | pdb->in.pll_lpf_res1);

	MDSS_PLL_REG_W(pll_base, DSIPHY_PLL_PLL_LPF2_POSTDIV, data);



	data = (pout->pll_n1div | (pout->pll_n2div << 4));

	MDSS_PLL_REG_W(pll_base, DSIPHY_CMN_CLK_CFG0, data);



	wmb();	/* make sure register committed */

}



int pll_vco_set_rate_8996(struct clk *c, unsigned long rate)

{

	int rc;

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);

	struct mdss_pll_resources *pll = vco->priv;

	struct dsi_pll_db *pdb;



	pdb = (struct dsi_pll_db *)pll->priv;

	if (!pdb) {

		pr_err("No prov found\n");

		return -EINVAL;

	}



	rc = mdss_pll_resource_enable(pll, true);

	if (rc) {

		pr_err("Failed to enable mdss dsi pll resources\n");

		return rc;

	}



	pr_debug("%s: rate=%lu\n", __func__, rate);



	pll->vco_current_rate = rate;

	pll->vco_ref_clk_rate = vco->ref_clk_rate;



	mdss_dsi_pll_8996_input_init(pdb);



	pll_8996_dec_frac_calc(pdb, pll->vco_current_rate,

					pll->vco_ref_clk_rate);



	pll_8996_calc_vco_count(pdb, pll->vco_current_rate,

					pll->vco_ref_clk_rate);



	pll_db_commit_8996(pll->pll_base, pdb);



	mdss_pll_resource_enable(pll, false);



	return rc;

}



unsigned long pll_vco_get_rate_8996(struct clk *c)

{

	u64 vco_rate, multiplier = (1 << 20);

	s32 div_frac_start;

	u32 dec_start;

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);

	u64 ref_clk = vco->ref_clk_rate;

	int rc;

	struct mdss_pll_resources *pll = vco->priv;



	if (is_gdsc_disabled(pll))

		return 0;



	rc = mdss_pll_resource_enable(pll, true);

	if (rc) {

		pr_err("Failed to enable mdss dsi pll resources\n");

		return rc;

	}



	dec_start = MDSS_PLL_REG_R(pll->pll_base,

			DSIPHY_PLL_DEC_START);

	dec_start &= 0x0ff;

	pr_debug("dec_start = 0x%x\n", dec_start);



	div_frac_start = (MDSS_PLL_REG_R(pll->pll_base,

			DSIPHY_PLL_DIV_FRAC_START3) & 0x0ff) << 16;

	div_frac_start |= (MDSS_PLL_REG_R(pll->pll_base,

			DSIPHY_PLL_DIV_FRAC_START2) & 0x0ff) << 8;

	div_frac_start |= MDSS_PLL_REG_R(pll->pll_base,

			DSIPHY_PLL_DIV_FRAC_START1) & 0x0ff;

	pr_debug("div_frac_start = 0x%x\n", div_frac_start);



	vco_rate = ref_clk * 2 * dec_start;

	vco_rate += ((ref_clk * div_frac_start) / multiplier);



	pr_debug("returning vco rate = %lu\n", (unsigned long)vco_rate);



	mdss_pll_resource_enable(pll, false);



	return (unsigned long)vco_rate;

}



long pll_vco_round_rate_8996(struct clk *c, unsigned long rate)

{

	unsigned long rrate = rate;

	u32 div;

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);



	div = vco->min_rate / rate;

	if (div > 15) {

		/* rate < 86.67 Mhz */

		pr_err("rate=%lu NOT supportted\n", rate);

		return -EINVAL;

	}



	if (rate < vco->min_rate)

		rrate = vco->min_rate;

	if (rate > vco->max_rate)

		rrate = vco->max_rate;



	return rrate;

}



enum handoff pll_vco_handoff_8996(struct clk *c)

{

	int rc;

	enum handoff ret = HANDOFF_DISABLED_CLK;

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);

	struct mdss_pll_resources *pll = vco->priv;



	if (is_gdsc_disabled(pll))

		return HANDOFF_DISABLED_CLK;



	rc = mdss_pll_resource_enable(pll, true);

	if (rc) {

		pr_err("Failed to enable mdss dsi pll resources\n");

		return ret;

	}



	if (pll_is_pll_locked_8996(pll)) {

		pll->handoff_resources = true;

		pll->pll_on = true;

		c->rate = pll_vco_get_rate_8996(c);

		ret = HANDOFF_ENABLED_CLK;

	} else {

		mdss_pll_resource_enable(pll, false);

	}



	return ret;

}



int pll_vco_prepare_8996(struct clk *c)

{

	int rc = 0;

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);

	struct mdss_pll_resources *pll = vco->priv;



	if (!pll) {

		pr_err("Dsi pll resources are not available\n");

		return -EINVAL;

	}



	if ((pll->vco_cached_rate != 0)

	    && (pll->vco_cached_rate == c->rate)) {

		rc = c->ops->set_rate(c, pll->vco_cached_rate);

		if (rc) {

			pr_err("vco_set_rate failed. rc=%d\n", rc);

			goto error;

		}

	}



	rc = dsi_pll_enable(c);



error:

	return rc;

}



void pll_vco_unprepare_8996(struct clk *c)

{

	struct dsi_pll_vco_clk *vco = to_vco_clk(c);

	struct mdss_pll_resources *pll = vco->priv;



	if (!pll) {

		pr_err("Dsi pll resources are not available\n");

		return;

	}



	pll->vco_cached_rate = c->rate;

	dsi_pll_disable(c);

}

drivers/clk/qcom/mdss/mdss-dsi-pll-8996.c

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drivers/clk/qcom/mdss/mdss-dsi-pll-8996.h

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drivers/clk/qcom/mdss/mdss-dsi-pll.h

+3 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -56,6 +56,8 @@ int dsi_pll_clock_register_20nm(struct platform_device *pdev, 
				struct mdss_pll_resources *pll_res);

int dsi_pll_clock_register_lpm(struct platform_device *pdev,

				struct mdss_pll_resources *pll_res);

int dsi_pll_clock_register_8996(struct platform_device *pdev,

				struct mdss_pll_resources *pll_res);



int set_byte_mux_sel(struct mux_clk *clk, int sel);

int get_byte_mux_sel(struct mux_clk *clk);