diff options
Diffstat (limited to 'target/linux/s3c24xx/patches/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch')
| -rwxr-xr-x | target/linux/s3c24xx/patches/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch b/target/linux/s3c24xx/patches/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch new file mode 100755 index 0000000000..13945f56b7 --- /dev/null +++ b/target/linux/s3c24xx/patches/0057-fix-pcf50606-LOWBAT-kill-init.patch.patch @@ -0,0 +1,83 @@ +From 835002d2e751c0d35b744ceec5bef726b9778b7b Mon Sep 17 00:00:00 2001 +From: mokopatches <mokopatches@openmoko.org> +Date: Fri, 25 Jul 2008 22:21:25 +0100 +Subject: [PATCH] fix-pcf50606-LOWBAT-kill-init.patch + +--- + drivers/i2c/chips/pcf50606.c | 53 ++++++++++++++++++++++++++++++++++++----- + 1 files changed, 46 insertions(+), 7 deletions(-) + +diff --git a/drivers/i2c/chips/pcf50606.c b/drivers/i2c/chips/pcf50606.c +index b530583..a1c92d3 100644 +--- a/drivers/i2c/chips/pcf50606.c ++++ b/drivers/i2c/chips/pcf50606.c +@@ -654,8 +654,20 @@ static void pcf50606_work(struct work_struct *work) + if (pcf->onkey_seconds >= + pcf->pdata->onkey_seconds_required) { + /* Ask init to do 'ctrlaltdel' */ +- DEBUGPC("SIGINT(init) "); +- kill_proc(1, SIGINT, 1); ++ /* ++ * currently Linux reacts badly to issuing a ++ * signal to PID #1 before init is started. ++ * What happens is that the next kernel thread ++ * to start, which is the JFFS2 Garbage ++ * collector in our case, gets the signal ++ * instead and proceeds to fail to fork -- ++ * which is very bad. Therefore we confirm ++ * PID #1 exists before issuing the signal ++ */ ++ if (find_task_by_pid(1)) { ++ kill_proc(1, SIGINT, 1); ++ DEBUGPC("SIGINT(init) "); ++ } + /* FIXME: what to do if userspace doesn't + * shut down? Do we want to force it? */ + } +@@ -749,11 +761,38 @@ static void pcf50606_work(struct work_struct *work) + } + /* FIXME: TSCPRES */ + if (pcfirq[2] & PCF50606_INT3_LOWBAT) { +- /* Really low battery voltage, we have 8 seconds left */ +- DEBUGPC("LOWBAT "); +- apm_queue_event(APM_LOW_BATTERY); +- DEBUGPC("SIGPWR(init) "); +- kill_proc(1, SIGPWR, 1); ++ if (__reg_read(pcf, PCF50606_REG_OOCS) & PCF50606_OOCS_EXTON) { ++ /* ++ * hey no need to freak out, we have some kind of ++ * valid charger power ++ */ ++ DEBUGPC("(NO)BAT "); ++ } else { ++ /* Really low battery voltage, we have 8 seconds left */ ++ DEBUGPC("LOWBAT "); ++ /* ++ * currently Linux reacts badly to issuing a signal to ++ * PID #1 before init is started. What happens is that ++ * the next kernel thread to start, which is the JFFS2 ++ * Garbage collector in our case, gets the signal ++ * instead and proceeds to fail to fork -- which is ++ * very bad. Therefore we confirm PID #1 exists ++ * before issuing SPIGPWR ++ */ ++ if (find_task_by_pid(1)) { ++ apm_queue_event(APM_LOW_BATTERY); ++ DEBUGPC("SIGPWR(init) "); ++ kill_proc(1, SIGPWR, 1); ++ } else ++ /* ++ * well, our situation is like this: we do not ++ * have any external power, we have a low ++ * battery and since PID #1 doesn't exist yet, ++ * we are early in the boot, likely before ++ * rootfs mount. We should just call it a day ++ */ ++ apm_queue_event(APM_CRITICAL_SUSPEND); ++ } + /* Tell PMU we are taking care of this */ + reg_set_bit_mask(pcf, PCF50606_REG_OOCC1, + PCF50606_OOCC1_TOTRST, +-- +1.5.6.3 + |