mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-19 04:39:41 +02:00
fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
237 lines
8.0 KiB
Diff
237 lines
8.0 KiB
Diff
From eaa55efc0b559abebbcf2acea6ce267cea4c26f2 Mon Sep 17 00:00:00 2001
|
|
From: Andy Green <andy@openmoko.com>
|
|
Date: Wed, 2 Jul 2008 22:41:52 +0100
|
|
Subject: [PATCH] fix-pcf50633-disable-irq-from-suspend-until-resume.patch
|
|
|
|
Disable pcf interrupt (not for wake, just as interrupt) in
|
|
suspend, re-enable it again just before we force-call the
|
|
workqueue function at end of pcf resume, which leads to
|
|
pcf interrupt source registers getting cleared so it can
|
|
signal an interrupt normally again.
|
|
|
|
This change ends the uncontrolled appearance of pcf interrupts
|
|
during resume time which previously caused the work to attempt
|
|
to use the I2C stuff before i2c host device had itself resumed.
|
|
Now the isr work is only queued, and the isr work function called,
|
|
definitively after pcf resume completes.
|
|
|
|
In suspend time, the work function may have been queued some
|
|
time before and be pending, and it could still show up at a
|
|
bad time. Therefore if the work function sees that it is
|
|
coming since the start of pcf50633 suspend function, it
|
|
aborts without attempting to read the pcf interrupt regs,
|
|
leaving them for resume to take care of.
|
|
|
|
USB current limit and no battery work functions are also made
|
|
aware of suspend state and act accordingly.
|
|
|
|
Lastly I noticed that in early resume, i2c_get_clientdata(&pcf->client)
|
|
returns NULL, presumably because i2c device is still suspended. This
|
|
could easily make trouble for async events like interrupt work,
|
|
since pcf pointer is the client data. Disabling appearance of the
|
|
work until after pcf50633 resume will also avoid that.
|
|
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
|
---
|
|
drivers/i2c/chips/pcf50633.c | 93 +++++++++++++++++++++++++++++-------------
|
|
1 files changed, 65 insertions(+), 28 deletions(-)
|
|
|
|
diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
|
|
index c014384..120fdbc 100644
|
|
--- a/drivers/i2c/chips/pcf50633.c
|
|
+++ b/drivers/i2c/chips/pcf50633.c
|
|
@@ -632,6 +632,11 @@ static void pcf50633_work_usbcurlim(struct work_struct *work)
|
|
|
|
mutex_lock(&pcf->working_lock_usb_curlimit);
|
|
|
|
+ /* just can't cope with it if we are suspending, don't reschedule */
|
|
+ if ((pcf->suspend_state == PCF50633_SS_STARTING_SUSPEND) ||
|
|
+ (pcf->suspend_state == PCF50633_SS_COMPLETED_SUSPEND))
|
|
+ goto bail;
|
|
+
|
|
dev_info(&pcf->client.dev, "pcf50633_work_usbcurlim\n");
|
|
|
|
if (!pcf->probe_completed)
|
|
@@ -663,7 +668,8 @@ bail:
|
|
reschedule:
|
|
dev_info(&pcf->client.dev, "pcf50633_work_usbcurlim rescheduling\n");
|
|
if (!schedule_work(&pcf->work_usb_curlimit))
|
|
- dev_err(&pcf->client.dev, "work item may be lost\n");
|
|
+ dev_err(&pcf->client.dev, "curlim reschedule work "
|
|
+ "already queued\n");
|
|
|
|
mutex_unlock(&pcf->working_lock_usb_curlimit);
|
|
/* don't spew, delaying whatever else is happening */
|
|
@@ -700,7 +706,7 @@ int pcf50633_notify_usb_current_limit_change(struct pcf50633_data *pcf,
|
|
pcf->pending_curlimit = ma;
|
|
|
|
if (!schedule_work(&pcf->work_usb_curlimit))
|
|
- dev_err(&pcf->client.dev, "work item may be lost\n");
|
|
+ dev_err(&pcf->client.dev, "curlim work item already queued\n");
|
|
|
|
return 0;
|
|
}
|
|
@@ -727,6 +733,9 @@ static void pcf50633_work_nobat(struct work_struct *work)
|
|
while (1) {
|
|
msleep(1000);
|
|
|
|
+ if (pcf->suspend_state != PCF50633_SS_RUNNING)
|
|
+ continue;
|
|
+
|
|
/* there's a battery in there now? */
|
|
if (reg_read(pcf, PCF50633_REG_MBCS3) & 0x40) {
|
|
|
|
@@ -761,6 +770,10 @@ static void pcf50633_work(struct work_struct *work)
|
|
mutex_lock(&pcf->working_lock);
|
|
pcf->working = 1;
|
|
|
|
+ /* sanity */
|
|
+ if (!&pcf->client.dev)
|
|
+ goto bail;
|
|
+
|
|
/*
|
|
* if we are presently suspending, we are not in a position to deal
|
|
* with pcf50633 interrupts at all.
|
|
@@ -784,42 +797,55 @@ static void pcf50633_work(struct work_struct *work)
|
|
* reloaded with their pre-suspend states yet. Therefore we will
|
|
* defer our service if we are called like that until our resume has
|
|
* completed.
|
|
+ *
|
|
+ * This shouldn't happen any more because we disable servicing this
|
|
+ * interrupt in suspend and don't re-enable it until resume is
|
|
+ * completed.
|
|
*/
|
|
|
|
- if (pcf->have_been_suspended && (pcf->have_been_suspended < 3))
|
|
+ if (pcf->suspend_state &&
|
|
+ (pcf->suspend_state != PCF50633_SS_COMPLETED_RESUME))
|
|
+ goto reschedule;
|
|
+
|
|
+ /* this is the case early in resume! Sanity check! */
|
|
+ if (i2c_get_clientdata(&pcf->client) == NULL)
|
|
goto reschedule;
|
|
|
|
/*
|
|
- * datasheet says we have to read the five IRQ
|
|
- * status regs in one transaction
|
|
- */
|
|
- ret = i2c_smbus_read_i2c_block_data(&pcf->client, PCF50633_REG_INT1, 5,
|
|
- pcfirq);
|
|
- if (ret != 5) {
|
|
+ * datasheet says we have to read the five IRQ
|
|
+ * status regs in one transaction
|
|
+ */
|
|
+ ret = i2c_smbus_read_i2c_block_data(&pcf->client,
|
|
+ PCF50633_REG_INT1,
|
|
+ sizeof(pcfirq),
|
|
+ pcfirq);
|
|
+ if (ret != sizeof(pcfirq)) {
|
|
dev_info(&pcf->client.dev,
|
|
- "Oh crap PMU IRQ register read failed -- "
|
|
- "retrying later %d\n", ret);
|
|
+ "Oh crap PMU IRQ register read failed -- "
|
|
+ "retrying later %d\n", ret);
|
|
/*
|
|
- * it shouldn't fail, we no longer attempt to use I2C while
|
|
- * it can be suspended. But we don't have much option but to
|
|
- * retry if if it ever did fail, because if we don't service
|
|
- * the interrupt to clear it, we will never see another PMU
|
|
- * interrupt edge.
|
|
+ * it shouldn't fail, we no longer attempt to use
|
|
+ * I2C while it can be suspended. But we don't have
|
|
+ * much option but to retry if if it ever did fail,
|
|
+ * because if we don't service the interrupt to clear
|
|
+ * it, we will never see another PMU interrupt edge.
|
|
*/
|
|
goto reschedule;
|
|
}
|
|
|
|
- /* hey did we just resume? */
|
|
-
|
|
- if (pcf->have_been_suspended) {
|
|
- /* resume is officially over now then */
|
|
- pcf->have_been_suspended = 0;
|
|
+ /* hey did we just resume? (because we don't get here unless we are
|
|
+ * running normally or the first call after resumption)
|
|
+ */
|
|
|
|
+ if (pcf->suspend_state != PCF50633_SS_RUNNING) {
|
|
/*
|
|
- * grab a copy of resume interrupt reasons
|
|
- * from pcf50633 POV
|
|
- */
|
|
+ * grab a copy of resume interrupt reasons
|
|
+ * from pcf50633 POV
|
|
+ */
|
|
memcpy(pcf->pcfirq_resume, pcfirq, sizeof(pcf->pcfirq_resume));
|
|
+
|
|
+ /* pcf50633 resume is really really over now then */
|
|
+ pcf->suspend_state = PCF50633_SS_RUNNING;
|
|
}
|
|
|
|
if (!pcf->coldplug_done) {
|
|
@@ -1169,6 +1195,7 @@ static void pcf50633_work(struct work_struct *work)
|
|
|
|
DEBUGPC("\n");
|
|
|
|
+bail:
|
|
pcf->working = 0;
|
|
input_sync(pcf->input_dev);
|
|
put_device(&pcf->client.dev);
|
|
@@ -1202,7 +1229,7 @@ static irqreturn_t pcf50633_irq(int irq, void *_pcf)
|
|
|
|
get_device(&pcf->client.dev);
|
|
if (!schedule_work(&pcf->work) && !pcf->working)
|
|
- dev_err(&pcf->client.dev, "work item may be lost\n");
|
|
+ dev_err(&pcf->client.dev, "pcf irq work already queued\n");
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
@@ -2310,7 +2337,7 @@ int pcf50633_report_resumers(struct pcf50633_data *pcf, char *buf)
|
|
char *end = buf;
|
|
int n;
|
|
|
|
- for (n = 0; n < 40; n++)
|
|
+ for (n = 0; n < ARRAY_SIZE(int_names); n++)
|
|
if (int_names[n]) {
|
|
if (pcf->pcfirq_resume[n >> 3] & (1 >> (n & 7)))
|
|
end += sprintf(end, " * %s\n", int_names[n]);
|
|
@@ -2359,6 +2386,15 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
|
|
|
|
mutex_lock(&pcf->lock);
|
|
|
|
+ pcf->suspend_state = PCF50633_SS_STARTING_SUSPEND;
|
|
+
|
|
+ /* we are not going to service any further interrupts until we
|
|
+ * resume. If the IRQ workqueue is still pending in the background,
|
|
+ * it will bail when it sees we set suspend state above
|
|
+ */
|
|
+
|
|
+ disable_irq(pcf->irq);
|
|
+
|
|
/* Save all registers that don't "survive" standby state */
|
|
pcf->standby_regs.ooctim2 = __reg_read(pcf, PCF50633_REG_OOCTIM2);
|
|
|
|
@@ -2502,6 +2538,8 @@ static int pcf50633_resume(struct device *dev)
|
|
|
|
pcf->suspend_state = PCF50633_SS_COMPLETED_RESUME;
|
|
|
|
+ enable_irq(pcf->irq);
|
|
+
|
|
mutex_unlock(&pcf->lock);
|
|
|
|
/* gratuitous call to PCF work function, in the case that the PCF
|
|
@@ -2511,8 +2549,7 @@ static int pcf50633_resume(struct device *dev)
|
|
*/
|
|
|
|
get_device(&pcf->client.dev);
|
|
- if (!schedule_work(&pcf->work) && !pcf->working)
|
|
- dev_err(&pcf->client.dev, "resume work item may be lost\n");
|
|
+ pcf50633_work(&pcf->work);
|
|
|
|
callback_all_resume_dependencies(&pcf->resume_dependency);
|
|
|
|
--
|
|
1.5.6.5
|
|
|