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Commit 47fbd0b9 authored by Tharun Raj Soma's avatar Tharun Raj Soma
Browse files

drm/msm/dsi-staging: add support for change in minimum voltage of regulator 



Some regulators require change in their minimum voltage level
before the client removes its vote. This change checks if there is
a change in the minimum voltage level required and updates the
corresponding level before the regulator is disabled.

Change-Id: Ib62027a01c21ed12bab5cd221f39e089a3b054bb
Signed-off-by: default avatarTharun Raj Soma <tsoma@codeaurora.org>
parent 70f35db1

Documentation/devicetree/bindings/drm/msm/sde-dsi.txt

+1 −0
Original line number Diff line number Diff line
@@ -83,6 +83,7 @@ Optional properties: 
					-- qcom,supply-max-voltage: maximum voltage level (uV)

					-- qcom,supply-enable-load: load drawn (uA) from enabled supply

					-- qcom,supply-disable-load: load drawn (uA) from disabled supply

					-- qcom,supply-off-min-voltage: minimum voltage level (uV) when turned off

					-- qcom,supply-pre-on-sleep: time to sleep (ms) before turning on

					-- qcom,supply-post-on-sleep: time to sleep (ms) after turning on

					-- qcom,supply-pre-off-sleep: time to sleep (ms) before turning off

drivers/gpu/drm/msm/dsi-staging/dsi_pwr.c

+14 −1
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2016-2019, 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
@@ -73,6 +73,14 @@ static int dsi_pwr_parse_supply_node(struct dsi_parser_utils *utils, 
		regs->vregs[i].disable_load = tmp;



		/* Optional values */

		rc = utils->read_u32(node, "qcom,supply-off-min-voltage", &tmp);

		if (rc) {

			pr_debug("off-min-voltage not specified\n");

			rc = 0;

		} else {

			regs->vregs[i].off_min_voltage = tmp;

		}



		rc = utils->read_u32(node, "qcom,supply-pre-on-sleep", &tmp);

		if (rc) {

			pr_debug("pre-on-sleep not specified\n");
@@ -167,6 +175,11 @@ static int dsi_pwr_enable_vregs(struct dsi_regulator_info *regs, bool enable) 
			if (regs->vregs[i].pre_off_sleep)

				msleep(regs->vregs[i].pre_off_sleep);



			if (regs->vregs[i].off_min_voltage)

				(void)regulator_set_voltage(regs->vregs[i].vreg,

						regs->vregs[i].off_min_voltage,

						regs->vregs[i].max_voltage);



			(void)regulator_set_load(regs->vregs[i].vreg,

						regs->vregs[i].disable_load);

			(void)regulator_disable(regs->vregs[i].vreg);

drivers/gpu/drm/msm/dsi-staging/dsi_pwr.h

+3 −1
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2016-2019, 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
@@ -30,6 +30,7 @@ struct dsi_parser_utils; 
 * @max_voltage:     Maximum voltage in uV.

 * @enable_load:     Load, in uA, when enabled.

 * @disable_load:    Load, in uA, when disabled.

 * @off_min_voltage: Minimum voltage in uV when regulator is disabled.

 * @pre_on_sleep:    Sleep, in ms, before enabling the regulator.

 * @post_on_sleep:   Sleep, in ms, after enabling the regulator.

 * @pre_off_sleep:   Sleep, in ms, before disabling the regulator.
@@ -42,6 +43,7 @@ struct dsi_vreg { 
	u32 max_voltage;

	u32 enable_load;

	u32 disable_load;

	u32 off_min_voltage;

	u32 pre_on_sleep;

	u32 post_on_sleep;

	u32 pre_off_sleep;