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Commit b2e93442 authored by Abhinav Kumar's avatar Abhinav Kumar Committed by Gerrit - the friendly Code Review server
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clk: mdss: re-program PLL registers to power-on-reset value 



When the supply to PLL digital domain is turned off,
it can result in certain PLL registers to get corrupted.

Make sure to re-program the PLL registers to the
power-on-reset value before starting to program the PLL again
to ensure that it locks reliably.

Change-Id: I63cac884cf11eae60b187f83654f5922a3342d66
Signed-off-by: default avatarAbhinav Kumar <abhinavk@codeaurora.org>
parent c5751be2

drivers/clk/msm/mdss/mdss-dsi-pll-8998.c

+89 −9
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2016, The Linux Foundation. All rights reserved.

 * Copyright (c) 2016-2017, 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
@@ -38,24 +38,52 @@ 
/* Register Offsets from PLL base address */

#define PLL_ANALOG_CONTROLS_ONE			0x000

#define PLL_ANALOG_CONTROLS_TWO			0x004

#define PLL_INT_LOOP_SETTINGS			0x008

#define PLL_INT_LOOP_SETTINGS_TWO		0x00c

#define PLL_ANALOG_CONTROLS_THREE		0x010

#define PLL_ANALOG_CONTROLS_FOUR		0x014

#define PLL_INT_LOOP_CONTROLS			0x018

#define PLL_DSM_DIVIDER					0x01c

#define PLL_FEEDBACK_DIVIDER			0x020

#define PLL_SYSTEM_MUXES			0x024

#define PLL_FREQ_UPDATE_CONTROL_OVERRIDES			0x028

#define PLL_CMODE				0x02c

#define PLL_CALIBRATION_SETTINGS		0x030

#define PLL_BAND_SEL_CAL_TIMER_LOW		0x034

#define PLL_BAND_SEL_CAL_TIMER_HIGH		0x038

#define PLL_BAND_SEL_CAL_SETTINGS		0x03c

#define PLL_BAND_SEL_MIN		0x040

#define PLL_BAND_SEL_MAX		0x044

#define PLL_BAND_SEL_PFILT		0x048

#define PLL_BAND_SEL_IFILT		0x04c

#define PLL_BAND_SEL_CAL_SETTINGS_TWO		0x050

#define PLL_BAND_SEL_CAL_SETTINGS_THREE		0x054

#define PLL_BAND_SEL_CAL_SETTINGS_FOUR		0x058

#define PLL_BAND_SEL_ICODE_HIGH				0x05c

#define PLL_BAND_SEL_ICODE_LOW				0x060

#define PLL_FREQ_DETECT_SETTINGS_ONE		0x064

#define PLL_PFILT				0x07c

#define PLL_IFILT				0x080

#define PLL_GAIN				0x084

#define PLL_ICODE_LOW			0x088

#define PLL_ICODE_HIGH			0x08c

#define PLL_LOCKDET				0x090

#define PLL_OUTDIV				0x094

#define PLL_FASTLOCK_CONTROL	0x098

#define PLL_PASS_OUT_OVERRIDE_ONE		0x09c

#define PLL_PASS_OUT_OVERRIDE_TWO		0x0a0

#define PLL_CORE_OVERRIDE				0x0a4

#define PLL_CORE_INPUT_OVERRIDE			0x0a8

#define PLL_RATE_CHANGE					0x0ac

#define PLL_PLL_DIGITAL_TIMERS			0x0b0

#define PLL_PLL_DIGITAL_TIMERS_TWO		0x0b4

#define PLL_DEC_FRAC_MUXES				0x0c8

#define PLL_DECIMAL_DIV_START_1			0x0cc

#define PLL_FRAC_DIV_START_LOW_1		0x0d0

#define PLL_FRAC_DIV_START_MID_1		0x0d4

#define PLL_FRAC_DIV_START_HIGH_1		0x0d8

#define PLL_MASH_CONTROL				0x0ec

#define PLL_SSC_MUX_CONTROL				0x108

#define PLL_SSC_STEPSIZE_LOW_1			0x10c

#define PLL_SSC_STEPSIZE_HIGH_1			0x110

#define PLL_SSC_DIV_PER_LOW_1			0x114
@@ -69,9 +97,16 @@ 
#define PLL_PLL_BAND_SET_RATE_1			0x154

#define PLL_PLL_INT_GAIN_IFILT_BAND_1		0x15c

#define PLL_PLL_FL_INT_GAIN_PFILT_BAND_1	0x164

#define PLL_FASTLOCK_EN_BAND				0x16c

#define PLL_FREQ_TUNE_ACCUM_INIT_MUX		0x17c

#define PLL_PLL_LOCK_OVERRIDE				0x180

#define PLL_PLL_LOCK_DELAY					0x184

#define PLL_PLL_LOCK_MIN_DELAY				0x188

#define PLL_CLOCK_INVERTERS					0x18c

#define PLL_SPARE_AND_JPC_OVERRIDES			0x190

#define PLL_BIAS_CONTROL_1					0x194

#define PLL_BIAS_CONTROL_2					0x198

#define PLL_ALOG_OBSV_BUS_CTRL_1			0x19c

#define PLL_COMMON_STATUS_ONE				0x1a0



/* Register Offsets from PHY base address */
@@ -384,6 +419,49 @@ static void dsi_pll_config_hzindep_reg(struct dsi_pll_8998 *pll, 
	MDSS_PLL_REG_W(pll_base, PLL_IFILT, 0x3f);

}



static void dsi_pll_init_val(struct mdss_pll_resources *rsc)

{

	void __iomem *pll_base = rsc->pll_base;



	MDSS_PLL_REG_W(pll_base, PLL_CORE_INPUT_OVERRIDE, 0x10);

	MDSS_PLL_REG_W(pll_base, PLL_INT_LOOP_SETTINGS, 0x3f);

	MDSS_PLL_REG_W(pll_base, PLL_INT_LOOP_SETTINGS_TWO, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_ANALOG_CONTROLS_FOUR, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_INT_LOOP_CONTROLS, 0x80);

	MDSS_PLL_REG_W(pll_base, PLL_FREQ_UPDATE_CONTROL_OVERRIDES, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_CAL_TIMER_LOW, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_CAL_TIMER_HIGH, 0x02);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_CAL_SETTINGS, 0x82);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_MIN, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_MAX, 0xff);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_PFILT, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_IFILT, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_CAL_SETTINGS_TWO, 0x25);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_CAL_SETTINGS_FOUR, 0x4f);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_ICODE_HIGH, 0x0a);

	MDSS_PLL_REG_W(pll_base, PLL_BAND_SEL_ICODE_LOW, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_GAIN, 0x42);

	MDSS_PLL_REG_W(pll_base, PLL_ICODE_LOW, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_ICODE_HIGH, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_LOCKDET, 0x30);

	MDSS_PLL_REG_W(pll_base, PLL_FASTLOCK_CONTROL, 0x04);

	MDSS_PLL_REG_W(pll_base, PLL_PASS_OUT_OVERRIDE_ONE, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_PASS_OUT_OVERRIDE_TWO, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_RATE_CHANGE, 0x01);

	MDSS_PLL_REG_W(pll_base, PLL_PLL_DIGITAL_TIMERS, 0x08);

	MDSS_PLL_REG_W(pll_base, PLL_DEC_FRAC_MUXES, 0x00);

	MDSS_PLL_REG_W(pll_base, PLL_MASH_CONTROL, 0x03);

	MDSS_PLL_REG_W(pll_base, PLL_SSC_MUX_CONTROL, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_SSC_CONTROL, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_FASTLOCK_EN_BAND, 0x03);

	MDSS_PLL_REG_W(pll_base, PLL_FREQ_TUNE_ACCUM_INIT_MUX, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_PLL_LOCK_MIN_DELAY, 0x19);

	MDSS_PLL_REG_W(pll_base, PLL_SPARE_AND_JPC_OVERRIDES, 0x0);

	MDSS_PLL_REG_W(pll_base, PLL_BIAS_CONTROL_1, 0x40);

	MDSS_PLL_REG_W(pll_base, PLL_BIAS_CONTROL_2, 0x20);

	MDSS_PLL_REG_W(pll_base, PLL_ALOG_OBSV_BUS_CTRL_1, 0x0);

}



static void dsi_pll_commit(struct dsi_pll_8998 *pll,

			   struct mdss_pll_resources *rsc)

{
@@ -440,6 +518,8 @@ static int vco_8998_set_rate(struct clk *c, unsigned long rate) 
		return rc;

	}



	dsi_pll_init_val(rsc);



	dsi_pll_setup_config(pll, rsc);



	dsi_pll_calc_dec_frac(pll, rsc);