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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
135 lines
4.5 KiB
Diff
135 lines
4.5 KiB
Diff
From ac949375c7ef5882e8d3ea4f4a165b2fce943f21 Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Wed, 2 Jul 2008 22:39:56 +0100
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Subject: [PATCH] fix-pcf50633-interrupt-work-enforce-wait-on-resume-completion.patch
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Improve pcf50633 interrupt service scheduling to enforce only servicing
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when resume action is completed
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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drivers/i2c/chips/pcf50633.c | 67 ++++++++++++++++++++++++++++++------------
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1 files changed, 48 insertions(+), 19 deletions(-)
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diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
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index 4d92c84..33e2eaf 100644
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--- a/drivers/i2c/chips/pcf50633.c
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+++ b/drivers/i2c/chips/pcf50633.c
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@@ -656,6 +656,26 @@ static void pcf50633_work(struct work_struct *work)
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mutex_lock(&pcf->working_lock);
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pcf->working = 1;
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+
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+ dev_info(&pcf->client.dev, "pcf50633_work called with suspended = %d\n",
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+ pcf->have_been_suspended);
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+
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+ /*
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+ * If we are inside suspend -> resume completion time we don't attempt
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+ * service until we have fully resumed. Although we could talk to the
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+ * device as soon as I2C is up, the regs in the device which we might
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+ * choose to modify as part of the service action have not been
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+ * reloaded with their pre-suspend states yet. Therefore we will
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+ * defer our service if we are called like that until our resume has
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+ * completed.
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+ */
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+
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+ if (pcf->have_been_suspended && (pcf->have_been_suspended < 2)) {
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+ dev_info(&pcf->client.dev, "rescheduling, suspended = %d\n",
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+ pcf->have_been_suspended);
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+ goto reschedule;
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+ }
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+
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/*
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* datasheet says we have to read the five IRQ
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* status regs in one transaction
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@@ -663,30 +683,25 @@ static void pcf50633_work(struct work_struct *work)
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ret = i2c_smbus_read_i2c_block_data(&pcf->client, PCF50633_REG_INT1, 5,
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pcfirq);
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if (ret != 5) {
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- DEBUGP("Oh crap PMU IRQ register read failed -- "
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- "retrying later %d\n", ret);
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+ dev_info(&pcf->client.dev,
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+ "Oh crap PMU IRQ register read failed -- "
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+ "retrying later %d\n", ret);
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/*
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- * this situation can happen during resume, just defer
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- * handling the interrupt until enough I2C is up we can
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- * actually talk to the PMU. We can't just ignore this
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- * because we are on a falling edge interrupt and our
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- * PMU interrupt source does not clear until we read these
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- * interrupt source registers.
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+ * it shouldn't fail, we no longer attempt to use I2C while
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+ * it can be suspended. But we don't have much option but to
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+ * retry if if it ever did fail, because if we don't service
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+ * the interrupt to clear it, we will never see another PMU
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+ * interrupt edge.
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*/
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- if (!schedule_work(&pcf->work) && !pcf->working)
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- dev_dbg(&pcf->client.dev, "work item may be lost\n");
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-
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- /* we don't put the device here, hold it for next time */
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- mutex_unlock(&pcf->working_lock);
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- /* don't spew, delaying whatever else is happening */
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- msleep(1);
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- return;
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+ goto reschedule;
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}
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/* hey did we just resume? */
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if (pcf->have_been_suspended) {
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+ /* resume is officially over now then */
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pcf->have_been_suspended = 0;
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+
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/*
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* grab a copy of resume interrupt reasons
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* from pcf50633 POV
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@@ -1045,6 +1060,19 @@ static void pcf50633_work(struct work_struct *work)
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input_sync(pcf->input_dev);
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put_device(&pcf->client.dev);
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mutex_unlock(&pcf->working_lock);
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+
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+ return;
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+
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+reschedule:
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+ /* don't spew, delaying whatever else is happening */
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+ msleep(100);
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+
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+ dev_info(&pcf->client.dev, "rescheduling interrupt service\n");
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+ if (!schedule_work(&pcf->work))
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+ dev_err(&pcf->client.dev, "int service reschedule failed\n");
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+
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+ /* we don't put the device here, hold it for next time */
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+ mutex_unlock(&pcf->working_lock);
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}
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static irqreturn_t pcf50633_irq(int irq, void *_pcf)
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@@ -1052,10 +1080,11 @@ static irqreturn_t pcf50633_irq(int irq, void *_pcf)
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struct pcf50633_data *pcf = _pcf;
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DEBUGP("entering(irq=%u, pcf=%p): scheduling work\n", irq, _pcf);
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+ dev_info(&pcf->client.dev, "pcf50633_irq scheduling work\n");
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get_device(&pcf->client.dev);
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if (!schedule_work(&pcf->work) && !pcf->working)
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- dev_dbg(&pcf->client.dev, "work item may be lost\n");
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+ dev_err(&pcf->client.dev, "work item may be lost\n");
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return IRQ_HANDLED;
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}
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@@ -2244,9 +2273,9 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
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int pcf50633_ready(struct pcf50633_data *pcf)
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{
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if (!pcf)
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- return -EBUSY;
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+ return -EACCES;
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- if (pcf->have_been_suspended)
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+ if (pcf->have_been_suspended && (pcf->have_been_suspended < 3))
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return -EBUSY;
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return 0;
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--
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1.5.6.5
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