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ACPI / EC: Add more debug info and trivial code cleanup

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Add more debug info for EC transaction debugging, like the interrupt
status register value, the detail info of a EC transaction.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Feng Tang 2012-10-23 01:29:38 +02:00 committed by Rafael J. Wysocki
parent f351d027ee
commit b76b51ba0c
1 changed files with 21 additions and 16 deletions
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37
drivers/acpi/ec.c
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@ -175,30 +175,32 @@ static void start_transaction(struct acpi_ec *ec)
static void advance_transaction(struct acpi_ec *ec, u8 status)
{
unsigned long flags;
struct transaction *t = ec->curr;
spin_lock_irqsave(&ec->lock, flags);
if (!ec->curr)
if (!t)
goto unlock;
if (ec->curr->wlen > ec->curr->wi) {
if (t->wlen > t->wi) {
if ((status & ACPI_EC_FLAG_IBF) == 0)
acpi_ec_write_data(ec,
ec->curr->wdata[ec->curr->wi++]);
t->wdata[t->wi++]);
else
goto err;
} else if (ec->curr->rlen > ec->curr->ri) {
} else if (t->rlen > t->ri) {
if ((status & ACPI_EC_FLAG_OBF) == 1) {
ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
if (ec->curr->rlen == ec->curr->ri)
ec->curr->done = true;
t->rdata[t->ri++] = acpi_ec_read_data(ec);
if (t->rlen == t->ri)
t->done = true;
} else
goto err;
} else if (ec->curr->wlen == ec->curr->wi &&
} else if (t->wlen == t->wi &&
(status & ACPI_EC_FLAG_IBF) == 0)
ec->curr->done = true;
t->done = true;
goto unlock;
err:
/* false interrupt, state didn't change */
if (in_interrupt())
++ec->curr->irq_count;
++t->irq_count;
unlock:
spin_unlock_irqrestore(&ec->lock, flags);
}
@ -310,7 +312,8 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
status = -ETIME;
goto end;
}
pr_debug(PREFIX "transaction start\n");
pr_debug(PREFIX "transaction start (cmd=0x%02x, addr=0x%02x)\n",
t->command, t->wdata ? t->wdata[0] : 0);
/* disable GPE during transaction if storm is detected */
if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
/* It has to be disabled, so that it doesn't trigger. */
@ -326,8 +329,9 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
/* It is safe to enable the GPE outside of the transaction. */
acpi_enable_gpe(NULL, ec->gpe);
} else if (t->irq_count > ec_storm_threshold) {
pr_info(PREFIX "GPE storm detected, "
"transactions will use polling mode\n");
pr_info(PREFIX "GPE storm detected(%d GPEs), "
"transactions will use polling mode\n",
t->irq_count);
set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
}
pr_debug(PREFIX "transaction end\n");
@ -403,7 +407,7 @@ int ec_burst_disable(void)
EXPORT_SYMBOL(ec_burst_disable);
int ec_read(u8 addr, u8 * val)
int ec_read(u8 addr, u8 *val)
{
int err;
u8 temp_data;
@ -622,10 +626,11 @@ static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
u32 gpe_number, void *data)
{
struct acpi_ec *ec = data;
u8 status = acpi_ec_read_status(ec);
pr_debug(PREFIX "~~~> interrupt\n");
pr_debug(PREFIX "~~~> interrupt, status:0x%02x\n", status);
advance_transaction(ec, acpi_ec_read_status(ec));
advance_transaction(ec, status);
if (ec_transaction_done(ec) &&
(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
wake_up(&ec->wait);