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Commit d822080d authored by Taniya Das's avatar Taniya Das
Browse files

clk: msm: gdsc: Add API to allow clearing CORE & PERIPH memory 



In the cases where periph and core memory bits will be required to be
retained unless modem/low-power-audio subsystem are out of reset.

The boolean property 'qcom,disallow-clear' associated with a GDSC will
allow retaining the memory bits. Once modem & lpass subsystem are out of
reset the api 'gdsc_allow_clear_retention' will be invoked for the reuqired
GDSC from the respective pil client driver.

Change-Id: I331e04c6fd4ea43b10a534d063f288431c158791
Signed-off-by: default avatarTaniya Das <tdas@codeaurora.org>
parent ec7db6c5

Documentation/devicetree/bindings/regulator/gdsc-regulator.txt

+3 −0
Original line number Diff line number Diff line
@@ -43,6 +43,9 @@ Optional properties: 
			Ex. "base", "domain_addr".

 - qcom,no-status-check-on-disable: Do not poll the status bit when GDSC

			is disabled.

 - qcom,disallow-clear: Presence denotes the periph & core memory will not be

			cleared, unless the required subsystem does not invoke

			the api which will allow clearing the bits.



Example:

	gdsc_oxili_gx: qcom,gdsc@fd8c4024 {

drivers/clk/msm/gdsc.c

+17 −4
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ struct gdsc { 
	int			root_clk_idx;

	bool			no_status_check_on_disable;

	bool			is_gdsc_enabled;

	bool			allow_clear;

	void __iomem		*domain_addr;

	void __iomem		*hw_ctrl_addr;

	void __iomem		*sw_reset_addr;
@@ -71,6 +72,14 @@ enum gdscr_status { 


static DEFINE_MUTEX(gdsc_seq_lock);



void gdsc_allow_clear_retention(struct regulator *regulator)

{

	struct gdsc *sc = regulator_get_drvdata(regulator);



	if (sc)

		sc->allow_clear = true;

}



static int poll_gdsc_status(struct gdsc *sc, enum gdscr_status status)

{

	void __iomem *gdscr;
@@ -254,9 +263,9 @@ static int gdsc_disable(struct regulator_dev *rdev) 
	for (i = sc->clock_count-1; i >= 0; i--) {

		if (unlikely(i == sc->root_clk_idx))

			continue;

		if (sc->toggle_mem)

		if (sc->toggle_mem && sc->allow_clear)

			clk_set_flags(sc->clocks[i], CLKFLAG_NORETAIN_MEM);

		if (sc->toggle_periph)

		if (sc->toggle_periph && sc->allow_clear)

			clk_set_flags(sc->clocks[i], CLKFLAG_NORETAIN_PERIPH);

	}
@@ -561,13 +570,17 @@ static int gdsc_probe(struct platform_device *pdev) 
		}

	}



	sc->allow_clear = of_property_read_bool(pdev->dev.of_node,

							"qcom,disallow-clear");

	sc->allow_clear = !sc->allow_clear;



	for (i = 0; i < sc->clock_count; i++) {

		if (retain_mem || (regval & PWR_ON_MASK))

		if (retain_mem || (regval & PWR_ON_MASK) || !sc->allow_clear)

			clk_set_flags(sc->clocks[i], CLKFLAG_RETAIN_MEM);

		else

			clk_set_flags(sc->clocks[i], CLKFLAG_NORETAIN_MEM);



		if (retain_periph || (regval & PWR_ON_MASK))

		if (retain_periph || (regval & PWR_ON_MASK) || !sc->allow_clear)

			clk_set_flags(sc->clocks[i], CLKFLAG_RETAIN_PERIPH);

		else

			clk_set_flags(sc->clocks[i], CLKFLAG_NORETAIN_PERIPH);

include/linux/clk/gdsc.h

0 → 100644
+22 −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.

 */



#ifndef __GDSC_H

#define __GDSC_H



#include <linux/regulator/consumer.h>



/* Allow the clock memories to be turned off */

void gdsc_allow_clear_retention(struct regulator *regulator);



#endif