Hi,
* Merlijn Wajer <merlijn@xxxxxxxxxx> [191209 02:32]:
> I'm trying to figure out how I can try get my Nokia N900 to go into off
> mode.
...
> BTW, the kernel is patched with SGX support, so that may have something
> to do with it, but it seems to actually be idle, if I am reading
> pm_debug/count correctly. [2]
OK that's good to hear :)
> # cat idle.sh
> #!/bin/sh
>
> export UART_IDLE_MS=5000
> idle_uarts() {
> # Enable autosuspend
> uarts=$(find /sys/bus/platform/devices/*.serial/power/ -type d)
> for uart in ${uarts}; do
> echo -n ${UART_IDLE_MS} > ${uart}/autosuspend_delay_ms
> echo -n enabled > ${uart}/wakeup
> echo -n auto > ${uart}/control
> done
>
> # Configure wake-up from suspend
> uarts=$(find /sys/class/tty/tty[SO]*/power/ -type d 2>/dev/null)
> for uart in ${uarts}; do
> echo -n enabled > ${uart}/wakeup
> done
> }
>
> idle_uarts
>
> mount -t debugfs debugfs /sys/kernel/debug
> echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode
The above should do the right thing.
> [2] # cat /sys/kernel/debug/pm_debug/count
> usbhost_pwrdm
> (ON),OFF:0,RET:670,INA:0,ON:671,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0
> sgx_pwrdm (OFF),OFF:24,RET:0,INA:0,ON:24,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0
Yup sgx_pwrdm above looks good.
> core_pwrdm
> (ON),OFF:0,RET:0,INA:0,ON:1,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0,RET-MEMBANK2-OFF:0
> per_pwrdm (ON),OFF:0,RET:0,INA:0,ON:1,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0
Here per_pwrdm has some device(s) blocking idle for both per and core.
Below is my old debug patch that provides more info on the blocking
bits. It's probably some cm_idlest_per bit(s) that's blocking compared
to the known good 00010000 and 00000042 values.
Care to try it and reply with the cm_idlest_per and cm_idlest1_core
values you're seeing?
I've checked that n900 idles fine for me with omap2plus_defconfig
and minimal user space for v5.4.
Regards,
Tony
8< -----------------------
Allows seeing the deeper idle state blockers in
/sys/kernel/debug/pm_debug/count. For example, when
off idle is working on beaglboard xm, this is what
i see:
# sleep 5; cat /sys/kernel/debug/pm_debug/count
...
0006ffff 48005020 (fa005020) cm_idlest_per blocking bits: 00010000
e7ffffbd 48004a20 (fa004a20) cm_idlest1_core blocking bits: 00000042
0000000d 48004a28 (fa004a28) cm_idlest3_core
---
arch/arm/mach-omap2/pm-debug.c | 68 ++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -136,10 +136,78 @@ static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
return 0;
}
+#include "iomap.h"
+
+struct dregs {
+ const char *desc;
+ u32 phys;
+ void __iomem *virt;
+ u32 mask;
+};
+
+#define PER_CM_BASE 0x48005000
+#define PER_CM_REG(name, offset, mask) \
+ { name, PER_CM_BASE + offset, \
+ OMAP2_L4_IO_ADDRESS(PER_CM_BASE + offset), mask, }
+
+static struct dregs cm_per[] = {
+ PER_CM_REG("cm_idlest_per", 0x20, 0xfff80000), /* p 513 */
+ { NULL, },
+};
+
+#define CORE_CM_BASE 0x48004a00
+#define CORE_CM_REG(name, offset, mask) \
+ { name, CORE_CM_BASE + offset, \
+ OMAP2_L4_IO_ADDRESS(CORE_CM_BASE + offset), mask, }
+
+static struct dregs cm_core[] = {
+ CORE_CM_REG("cm_idlest1_core", 0x20, 0x9c800109), /* p 467 */
+ CORE_CM_REG("cm_idlest3_core", 0x28, 0xfffffffb),
+ { NULL, },
+};
+
+void __dregs_dump(struct dregs *dregs, struct seq_file *s)
+{
+ for (; dregs->desc; dregs++) {
+ u32 val, blockers;
+
+ val = __raw_readl(dregs->virt);
+
+ seq_printf(s, "%08x %08x (%p) %s",
+ val, dregs->phys, dregs->virt,
+ dregs->desc);
+
+ if (dregs->mask) {
+ blockers = ~val;
+ blockers &= ~dregs->mask;
+
+ if (blockers)
+ seq_printf(s, " blocking bits: %08x",
+ blockers);
+ }
+
+ seq_printf(s, "\n");
+ }
+}
+
+void cm_per_dump(struct seq_file *s)
+{
+ __dregs_dump(cm_per, s);
+}
+
+void cm_core_dump(struct seq_file *s)
+{
+ __dregs_dump(cm_core, s);
+}
+
static int pm_dbg_counters_show(struct seq_file *s, void *unused)
{
pwrdm_for_each(pwrdm_dbg_show_counter, s);
clkdm_for_each(clkdm_dbg_show_counter, s);
+ if (cpu_is_omap34xx()) {
+ cm_per_dump(s);
+ cm_core_dump(s);
+ }
return 0;
}
--
2.24.0
