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Commit fbf34e78 authored by Raghavendra Rao Ananta's avatar Raghavendra Rao Ananta
Browse files

power: reset: Add force warm reboot support 



Some entities, such as PCIe on the LE pltforms, do not want
to lose the communication link on a system reboot. As a result,
add support to force warm reboot of the system and preserve the
link.

Change-Id: Ib0c3435f92393eae31afee9c144d2aaf2abcb512
Signed-off-by: default avatarRaghavendra Rao Ananta <rananta@codeaurora.org>
parent 55c3d32b

Documentation/devicetree/bindings/power/reset/msm-poweroff.txt

+4 −0
Original line number Diff line number Diff line
@@ -9,6 +9,10 @@ Required Properties: 
-compatible: "qcom,pshold"

-reg: Specifies the physical address of the ps-hold register



Optional Properties:

-qcom,force-warm-reboot: Issue a warm reboot, even for the traditional cases

				where hard reboot is issued.



Example:



	restart@fc4ab000 {

drivers/power/reset/msm-poweroff.c

+10 −2
Original line number Diff line number Diff line 
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.

/* Copyright (c) 2013-2018, 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
@@ -83,6 +83,8 @@ static void *kaslr_imem_addr; 
#endif

static bool scm_dload_supported;



static bool force_warm_reboot;



static int dload_set(const char *val, const struct kernel_param *kp);

/* interface for exporting attributes */

struct reset_attribute {
@@ -286,8 +288,11 @@ static void msm_restart_prepare(const char *cmd) 
				(cmd != NULL && cmd[0] != '\0'));

	}



	if (force_warm_reboot)

		pr_info("Forcing a warm reset of the system\n");



	/* Hard reset the PMIC unless memory contents must be maintained. */

	if (need_warm_reset)

	if (force_warm_reboot || need_warm_reset)

		qpnp_pon_system_pwr_off(PON_POWER_OFF_WARM_RESET);

	else

		qpnp_pon_system_pwr_off(PON_POWER_OFF_HARD_RESET);
@@ -649,6 +654,9 @@ static int msm_restart_probe(struct platform_device *pdev) 
	if (!download_mode)

		scm_disable_sdi();



	force_warm_reboot = of_property_read_bool(dev->of_node,

						"qcom,force-warm-reboot");



	return 0;



err_restart_reason: