Standby current to high, rails keep enabled

[allard.potma]

I'm trying to enter standby (DDR off or on) on my custom board, containing a STM32MP151 and a STPMIC1B.

 

This is my STPMIC/suspend entry in the device tree of OPTEE:

 

&i2c4 {
	compatible = "st,stm32mp15-i2c-non-secure";
	pinctrl-names = "default";
	pinctrl-0 = <&i2c4_pins_z_mx>;
	//pinctrl-1 = <&i2c4_sleep_pins_a>;
	i2c-scl-rising-time-ns = <185>;
	i2c-scl-falling-time-ns = <20>;
	clock-frequency = <400000>;
	status = "okay";
	/* spare dmas for other usage */
	/delete-property/dmas;
	/delete-property/dma-names;

	pmic: stpmic@33 {
		compatible = "st,stpmic1";
		reg = <0x33>;
		interrupts-extended = <&gpioa 0 IRQ_TYPE_EDGE_FALLING>;
		interrupt-controller;
		#interrupt-cells = <2>;
		status = "okay";

		regulators {
			compatible = "st,stpmic1-regulators";
			buck1-supply = <&vin>;
			buck2-supply = <&vin>;
			buck3-supply = <&vin>;
			ldo3-supply = <&vdd>;
			ldo2-supply = <&vin>;
			ldo4-supply = <&bst_out>;
			boost-supply = <&vin>;
			vref_ddr-supply = <&vdd_ddr>;

			vddcore: buck1 {
				regulator-name = "vddcore";
				regulator-min-microvolt = <1200000>;
				regulator-max-microvolt = <1200000>;
				regulator-always-on;
				regulator-initial-mode = <0>;
				regulator-over-current-protection;
			};

			vdd_ddr: buck2 {
				regulator-name = "vdd_ddr";
				regulator-min-microvolt = <1200000>;
				regulator-max-microvolt = <1200000>;
				regulator-always-on;
				regulator-initial-mode = <0>;
				regulator-over-current-protection;
			};

			vdd: buck3 {
				regulator-name = "vdd";
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <1800000>;
				regulator-always-on;
				st,mask-reset;
				regulator-initial-mode = <0>;
				regulator-over-current-protection;
			};
			
			vdd_ddr_1v8: ldo3 {
				regulator-name = "vdd_ddr_1v8";
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <1800000>;
				regulator-always-on;
				regulator-over-current-protection;
			};

			vdd_emmc: ldo2 {
				regulator-name = "vdd_emmc";
				regulator-min-microvolt = <2900000>;
				regulator-max-microvolt = <2900000>;
				regulator-always-on;
				regulator-over-current-protection;
				interrupts = <IT_CURLIM_LDO2 0>;
			};
			
			bst_out: boost {
				regulator-name = "bst_out";
				interrupts = <IT_OCP_BOOST 0>;
			};
			
			vdd_usb: ldo4 {
				regulator-name = "vdd_usb";
				interrupts = <IT_CURLIM_LDO4 0>;
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
			};

			vref_ddr: vref_ddr {
				regulator-name = "vref_ddr";
				regulator-always-on;
			};
		};

		onkey {
			compatible = "st,stpmic1-onkey";
			interrupts = <IT_PONKEY_F 0>, <IT_PONKEY_R 0>;
			interrupt-names = "onkey-falling", "onkey-rising";
			power-off-time-sec = <10>;
			status = "enabled";
		};

		watchdog {
			compatible = "st,stpmic1-wdt";
			status = "disabled";
		};
	};
};

&pwr_regulators{
	status = "okay";

	/* USER CODE BEGIN pwr_regulators */
	system_suspend_supported_soc_modes = <
		STM32_PM_CSLEEP_RUN
		STM32_PM_CSTOP_ALLOW_LP_STOP
		STM32_PM_CSTOP_ALLOW_STANDBY_DDR_SR
	>;
	system_off_soc_mode = <STM32_PM_CSTOP_ALLOW_STANDBY_DDR_OFF>;
	vdd-supply = <&vdd>;
	vdd_3v3_usbfs-supply = <&vdd_usb>;
	/* USER CODE END pwr_regulators */
};

&vddcore {
	lp-stop {
		regulator-on-in-suspend;
	};
	standby-ddr-sr {
		regulator-off-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

&vdd_ddr {
	lp-stop {
		regulator-on-in-suspend;
	};
	standby-ddr-sr {
		regulator-on-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

&vdd {
	lp-stop {
		regulator-on-in-suspend;
	};
	standby-ddr-sr {
		regulator-on-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

&vdd_ddr_1v8 {
	lp-stop {
		regulator-on-in-suspend;
	};
	standby-ddr-sr {
		regulator-on-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

&vdd_emmc {
	lp-stop {
		regulator-on-in-suspend;
	};
	standby-ddr-sr {
		regulator-off-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

&bst_out {
	lp-stop {
		regulator-off-in-suspend;
	};
	standby-ddr-sr {
		regulator-off-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

&vdd_usb {
	lp-stop {
		regulator-off-in-suspend;
	};
	standby-ddr-sr {
		regulator-off-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

&vref_ddr {
	lp-stop {
		regulator-on-in-suspend;
	};
	standby-ddr-sr {
		regulator-on-in-suspend;
	};
	standby-ddr-off {
		regulator-off-in-suspend;
	};
};

 

 When I run

echo mem > /sys/power/state

 I get the following message:

 

[ 47.699035] PM: suspend entry (deep)
[ 47.797158] Filesystems sync: 0.095 seconds
[ 47.807093] Freezing user space processes
[ 47.812012] Freezing user space processes completed (elapsed 0.002 seconds)
[ 47.817707] OOM killer disabled.
[ 47.820762] Freezing remaining freezable tasks
[ 47.827030] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[ 47.833040] printk: Suspending console(s) (use no_console_suspend to debug)

 

After this i am not able to wake, and the power supply rails are not at the expected levels:

VDDCORE is at 1.2V

VDD_DDR is at 0V

VDD is at ~300mV

VDD_DDR_1V8 is at 0V

VDD_EMMC is at 2.9V

VDD_USB is at 3.3V

Questions:

- How to debug this? Why could some rails still be enabled?

- Is only the device tree of optee important for standby?

- Do I have to disable peripherals explicitly in optee device tree when they are enabled in kernel?

[PatrickF]

Hi,

some useful links (sorry if you already got it)
https://wiki.st.com/stm32mpu/wiki/Power_overview

STM32MP15x lines using low-power modes - AN5109.pdf

I'm not SW expert, but I guess all Device Tree should be aligned (or at least should not contain contradictory information).

Regards

[allard.potma]

I've read those wiki entries. When I enable 'trace and debug' I get the following log:

 

root@uptime:~# echo mem > /sys/power/state
[ 813.975319] PM: suspend entry (deep)
[ 813.989732] Filesystems sync: 0.012 seconds
F/TC:0 __clk_enable:1174 Clock 68 has been enabled
F/TC:0 __clk_disable:1187 Clock 68 has been disabled
[ 814.016977] Freezing user space processes
[ 814.023351] Freezing user space processes completed (elapsed 0.003 seconds)
[ 814.029120] OOM killer disabled.
[ 814.032077] Freezing remaining freezable tasks
[ 814.038682] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
F/TC:? 0 plat_scmi_clock_set_state:471 SCMI clock 8 disable
[ 814.176733] dwc2 49000000.usb-otg: suspending usb gadget configfs-gadget.g1
D/TC:0 pwr_scv_handler:56 PWR service: clear 0x1000000 at offset 0xc
F/TC:0 pwr_scv_handler:82 clr off c=1000000 => e0000000
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
F/TC:? 0 plat_scmi_clock_set_state:465 SCMI clock 13 enable
F/TC:0 0 __clk_enable:1174 Clock 140 has been enabled
D/TC:0 pwr_scv_handler:56 PWR service: set 0x1 at offset 0x28
F/TC:0 pwr_scv_handler:77 set off 28=1 => 1
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
F/TC:? 0 plat_scmi_clock_set_state:471 SCMI clock 13 disable
F/TC:0 0 __clk_disable:1187 Clock 140 has been disabled
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
F/TC:? 0 plat_scmi_clock_set_state:465 SCMI clock 8 enable
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
F/TC:? 0 plat_scmi_clock_set_state:471 SCMI clock 8 disable
[ 814.264928] stm32-dma 48000000.dma-controller: Suspend is prevented by Chan 0
[ 814.270618] stm32-dma 48000000.dma-controller: PM: dpm_run_callback(): platform_pm_suspend+0x0/0x48 returns -16
[ 814.280710] stm32-dma 48000000.dma-controller: PM: failed to suspend: error -16
[ 814.288042] PM: Some devices failed to suspend, or early wake event detected
D/TC:0 pwr_scv_handler:56 PWR service: set 0x1 at offset 0x28
F/TC:0 pwr_scv_handler:77 set off 28=1 => 1
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
F/TC:? 0 plat_scmi_clock_set_state:465 SCMI clock 8 enable
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
F/TC:? 0 plat_scmi_clock_set_state:465 SCMI clock 13 enable
F/TC:0 0 __clk_enable:1174 Clock 140 has been enabled
D/TC:0 pwr_scv_handler:56 PWR service: set 0x1 at offset 0x20
F/TC:0 pwr_scv_handler:77 set off 20=1 => 100
D/TC:0 pwr_scv_handler:56 PWR service: set 0x1000000 at offset 0xc
F/TC:0 pwr_scv_handler:77 set off c=1000000 => e1000000
[ 814.484889] dwc2 49000000.usb-otg: resuming usb gadget configfs-gadget.g1
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
[ 814.655228] stm32-rproc 10000000.m4: wdg irq registered
[ 814.659418] OOM killer enabled.
F/TC:? 0 pta_scmi_ocall:178 Posting MSG message on channel 0u
[ 814.662177] Restarting tasks ... done.
[ 814.688804] random: crng reseeded on system resumption
F/TC:? 0 plat_scmi_clock_set_state:471 SCMI clock 13 disable
F/TC:0 0 __clk_disable:1187 Clock 140 has been disabled
sh: write error: Device or resource busy[ 814.735200] PM: suspend exit

Somehow DMA is blocking the suspend.

[allard.potma]

I changed the device tree slightly:

 

&pwr_regulators{
	status = "okay";

	/* USER CODE BEGIN pwr_regulators */
	system_suspend_supported_soc_modes = <
		STM32_PM_CSLEEP_RUN
		STM32_PM_CSTOP_ALLOW_LP_STOP
		STM32_PM_CSTOP_ALLOW_LPLV_STOP
		STM32_PM_CSTOP_ALLOW_LPLV_STOP2
		STM32_PM_CSTOP_ALLOW_STANDBY_DDR_SR
	>;
	//system_off_soc_mode = <STM32_PM_CSTOP_ALLOW_STANDBY_DDR_OFF>;
	system_off_soc_mode = <STM32_PM_SHUTDOWN>;
	vdd-supply = <&vdd>;
	vdd_3v3_usbfs-supply = <&vdd_usb>;
	/* USER CODE END pwr_regulators */
};

 

Now the current drops to ~77uA when using 'shutdown -h now', and to ~1.2mA when using 'echo mem > /sys/power/state'. I looks like the echo mem method suspends to RAM, what I need. Unfortunately the method only works once, when I do another 'echo mem' after waking up from the previous one, the messages are there, but the current stays high, and after a couple of seconds the IWDG resets the processor.

If I enable the PM debugging, I get the DMA message again and the suspend is cancelled.