Used a custom board. Operating system Linux. Processor AM3352ZCZ60. Linux 3.2 kernel from TI.
Post is a continuation of: http://e2e.ti.com/support/arm/sitara_arm/f/791/p/341374/1226448.aspx
Periodically observed hovering board when you enter standby sleep. Managed to locate the place where it happens:
Below is a transition function which transfers control code translates processor in sleep mode.
file: arch/arm/mach-omap2/pm33xx.c
static int am33xx_do_sram_idle(long unsigned int state)
{
+ int i;
">>>>>>>>>>am33xx_do_sram_idle-100"
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
+ /* dump sram */
+// for(i=0; i<16; i++) {
+// pr_warn(">>>>>>>>>> 0x%lx\n", *(((unsigned long *)am33xx_do_wfi_sram) + i));
+// };
+
+ /* calculate crc */
+ size_t size = am33xx_do_wfi_sz/sizeof(unsigned long);
+ unsigned long *p = (unsigned long *) am33xx_do_wfi_sram;
+ unsigned long summ = 0;
+ for(i = 0; i < size; i++) {
+ summ += *p++;
+ }
+
">>>>>>>>>> sram summ = 0xa789f63f"
+ pr_warn(">>>>>>>>>> sram summ = 0x%lx\n", summ);
am33xx_do_wfi_sram(&suspend_cfg_param_list[0]);
-
return 0;
}
Also added logging sleep and wake:
@@ -117,11 +133,11 @@ static int am33xx_pm_suspend(void)
{
int state, ret = 0;
unsigned int retval;
struct omap_hwmod *gpmc_oh, *usb_oh, *gpio1_oh;
-
>>>>>>>>>>am33xx_pm_suspend-138
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
usb_oh = omap_hwmod_lookup("usb_otg_hs");
gpmc_oh = omap_hwmod_lookup("gpmc");
gpio1_oh = omap_hwmod_lookup("gpio1"); /* WKUP domain GPIO */
omap_hwmod_enable(usb_oh);
@@ -169,11 +185,11 @@ static int am33xx_pm_suspend(void)
* Keep Touchscreen module enabled during standby
* to enable wakeup from standby.
*/
if (suspend_state == PM_SUSPEND_STANDBY)
writel(0x2, AM33XX_CM_WKUP_ADC_TSC_CLKCTRL);
-
>>>>>>>>>>am33xx_pm_suspend-190
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
/* DMTimer wakeup from standby */
if (suspend_state == PM_SUSPEND_STANDBY) {
writel(0x2, AM33XX_CM_PER_TIMER7_CLKCTRL);
standby_dmtmr.stndby_tmr = omap_dm_timer_request_specific(7);
@@ -215,13 +231,17 @@ err_out:
pr_err("Could not program GFX to low power state\n");
omap3_intc_suspend();
writel(0x0, AM33XX_CM_MPU_MPU_CLKCTRL);
>>>>>>>>>>am33xx_pm_suspend-240
+ pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
ret = cpu_suspend(0, am33xx_do_sram_idle);
>>>>>>>>>>am33xx_pm_suspend-242
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
Added logging gpio in functions "am33xx_do_vfi" (performed in the built SRAM):
.align 3
ENTRY(am33xx_do_wfi)
stmfd sp!, {r4 - r11, lr} @ save registers on stack
.macro pll_bypass, name, clk_mode_addr, idlest_addr, pll_mode
@@ -119,21 +120,41 @@ wait_sc_\num:
bne wait_sc_\num
.endm
mov r8, r0 @ same arg list passed to us
- /* EMIF config for low power mode */
- ldr r0, emif_addr_func
- blx r0
-
- str r0, emif_addr_virt
Set pin in LO state
+#if 1
+/* debug 0 START */
+ /* Drive GPIO0_7 LOW */
+ ldr r0, gpio0_addr_func
+ blx r0
+ ldr r1, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+ mov r2, #(1 << 7)
+ str r2, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+/* debug 0 END */
+#endif
ldr r0, gpio0_addr_func
blx r0
-
str r0, gpio0_addr_virt
+#if 0
+/* debug 0 START */
+ /* Drive GPIO0_7 LOW */
+ ldr r0, gpio0_addr_virt
+ ldr r1, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+ mov r2, #(1 << 7)
+ str r2, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+/* debug 0 END */
+#endif
+
+ /* EMIF config for low power mode */
+ ldr r0, emif_addr_func
+ blx r0
+
+ str r0, emif_addr_virt
Options in the kernel use the following parameters: no_console_suspend.
Log output in normal mode:
file: arch/arm/mach-omap2/pm33xx.c
static int am33xx_do_sram_idle(long unsigned int state)
{
+ int i;
">>>>>>>>>>am33xx_do_sram_idle-100"
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
+ /* dump sram */
+// for(i=0; i<16; i++) {
+// pr_warn(">>>>>>>>>> 0x%lx\n", *(((unsigned long *)am33xx_do_wfi_sram) + i));
+// };
+
+ /* calculate crc */
+ size_t size = am33xx_do_wfi_sz/sizeof(unsigned long);
+ unsigned long *p = (unsigned long *) am33xx_do_wfi_sram;
+ unsigned long summ = 0;
+ for(i = 0; i < size; i++) {
+ summ += *p++;
+ }
+
">>>>>>>>>> sram summ = 0xa789f63f"
+ pr_warn(">>>>>>>>>> sram summ = 0x%lx\n", summ);
am33xx_do_wfi_sram(&suspend_cfg_param_list[0]);
-
return 0;
}
Also added logging sleep and wake:
@@ -117,11 +133,11 @@ static int am33xx_pm_suspend(void)
{
int state, ret = 0;
unsigned int retval;
struct omap_hwmod *gpmc_oh, *usb_oh, *gpio1_oh;
-
>>>>>>>>>>am33xx_pm_suspend-138
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
usb_oh = omap_hwmod_lookup("usb_otg_hs");
gpmc_oh = omap_hwmod_lookup("gpmc");
gpio1_oh = omap_hwmod_lookup("gpio1"); /* WKUP domain GPIO */
omap_hwmod_enable(usb_oh);
@@ -169,11 +185,11 @@ static int am33xx_pm_suspend(void)
* Keep Touchscreen module enabled during standby
* to enable wakeup from standby.
*/
if (suspend_state == PM_SUSPEND_STANDBY)
writel(0x2, AM33XX_CM_WKUP_ADC_TSC_CLKCTRL);
-
>>>>>>>>>>am33xx_pm_suspend-190
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
/* DMTimer wakeup from standby */
if (suspend_state == PM_SUSPEND_STANDBY) {
writel(0x2, AM33XX_CM_PER_TIMER7_CLKCTRL);
standby_dmtmr.stndby_tmr = omap_dm_timer_request_specific(7);
@@ -215,13 +231,17 @@ err_out:
pr_err("Could not program GFX to low power state\n");
omap3_intc_suspend();
writel(0x0, AM33XX_CM_MPU_MPU_CLKCTRL);
>>>>>>>>>>am33xx_pm_suspend-240
+ pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
ret = cpu_suspend(0, am33xx_do_sram_idle);
>>>>>>>>>>am33xx_pm_suspend-242
+pr_warn(">>>>>>>>>>%s-%d\n", __func__, __LINE__);
Added logging gpio in functions "am33xx_do_vfi" (performed in the built SRAM):
.align 3
ENTRY(am33xx_do_wfi)
stmfd sp!, {r4 - r11, lr} @ save registers on stack
.macro pll_bypass, name, clk_mode_addr, idlest_addr, pll_mode
@@ -119,21 +120,41 @@ wait_sc_\num:
bne wait_sc_\num
.endm
mov r8, r0 @ same arg list passed to us
- /* EMIF config for low power mode */
- ldr r0, emif_addr_func
- blx r0
-
- str r0, emif_addr_virt
Set pin in LO state
+#if 1
+/* debug 0 START */
+ /* Drive GPIO0_7 LOW */
+ ldr r0, gpio0_addr_func
+ blx r0
+ ldr r1, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+ mov r2, #(1 << 7)
+ str r2, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+/* debug 0 END */
+#endif
ldr r0, gpio0_addr_func
blx r0
-
str r0, gpio0_addr_virt
+#if 0
+/* debug 0 START */
+ /* Drive GPIO0_7 LOW */
+ ldr r0, gpio0_addr_virt
+ ldr r1, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+ mov r2, #(1 << 7)
+ str r2, [r0, #OMAP4_GPIO_CLEARDATAOUT]
+/* debug 0 END */
+#endif
+
+ /* EMIF config for low power mode */
+ ldr r0, emif_addr_func
+ blx r0
+
+ str r0, emif_addr_virt
Options in the kernel use the following parameters: no_console_suspend.
Log output in normal mode:
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
wlcore: down
Switching WLAN power to off
omap_hwmod: gpmc: _wait_target_disable failed
PM: suspend of devices complete after 146.606 msecs
PM: suspend devices took 0.150 seconds
PM: late suspend of devices complete after 1.525 msecs
>>>>>>>>>>am33xx_pm_suspend-138
omap_hwmod: gpmc: _wait_target_disable failed
>>>>>>>>>>am33xx_pm_suspend-190
>>>>>>>>>>am33xx_pm_suspend-240
>>>>>>>>>>am33xx_do_sram_idle-100
>>>>>>>>>> sram summ = 0xa789f63f
>>>>>>>>>>am33xx_pm_suspend-242
GFX domain entered low power state
Successfully transitioned all domains to low power state
PM: early resume of devices complete after 0.976 msecs
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
wlcore: down
Switching WLAN power to off
omap_hwmod: gpmc: _wait_target_disable failed
PM: suspend of devices complete after 146.606 msecs
PM: suspend devices took 0.150 seconds
PM: late suspend of devices complete after 1.525 msecs
>>>>>>>>>>am33xx_pm_suspend-138
omap_hwmod: gpmc: _wait_target_disable failed
>>>>>>>>>>am33xx_pm_suspend-190
>>>>>>>>>>am33xx_pm_suspend-240
>>>>>>>>>>am33xx_do_sram_idle-100
>>>>>>>>>> sram summ = 0xa789f63f
>>>>>>>>>>am33xx_pm_suspend-242
GFX domain entered low power state
Successfully transitioned all domains to low power state
PM: early resume of devices complete after 0.976 msecs
To the log when hanging:
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
wlcore: down
Switching WLAN power to off
omap_hwmod: gpmc: _wait_target_disable failed
PM: suspend of devices complete after 146.575 msecs
PM: suspend devices took 0.150 seconds
PM: late suspend of devices complete after 1.525 msecs
>>>>>>>>>>am33xx_pm_suspend-138
omap_hwmod: gpmc: _wait_target_disable failed
>>>>>>>>>>am33xx_pm_suspend-190
>>>>>>>>>>am33xx_pm_suspend-240
>>>>>>>>>>am33xx_do_sram_idle-100
>>>>>>>>>> sram summ = 0xa789f63f
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
wlcore: down
Switching WLAN power to off
omap_hwmod: gpmc: _wait_target_disable failed
PM: suspend of devices complete after 146.575 msecs
PM: suspend devices took 0.150 seconds
PM: late suspend of devices complete after 1.525 msecs
>>>>>>>>>>am33xx_pm_suspend-138
omap_hwmod: gpmc: _wait_target_disable failed
>>>>>>>>>>am33xx_pm_suspend-190
>>>>>>>>>>am33xx_pm_suspend-240
>>>>>>>>>>am33xx_do_sram_idle-100
>>>>>>>>>> sram summ = 0xa789f63f
When hanging pin still in a high state, from which it may be concluded problemme code execution in SRAM. Probable that fails SRAM. So were added capacity in supply chain VDDS_SRAM_CORE_BG (according to specification on the processor), it did not give a positive result.
Can you have any ideas?
