From d5c85f63672263b2f8ea12ac1c1b925e793fdd0a Mon Sep 17 00:00:00 2001 From: Feng Tang Date: Tue, 23 Oct 2012 01:29:38 +0200 Subject: ACPI / EC: Add more debug info and trivial code cleanup commit b76b51ba0cef13980813373a548a12206e3cd3c9 upstream. 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 Signed-off-by: Rafael J. Wysocki [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- drivers/acpi/ec.c | 37 +++++++++++++++++++++---------------- 1 file changed, 21 insertions(+), 16 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 392306472e5..75a12f1c0ff 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -178,30 +178,32 @@ 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->curr_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->curr_lock, flags); } @@ -311,7 +313,8 @@ 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. */ @@ -327,8 +330,9 @@ 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"); @@ -404,7 +408,7 @@ 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; @@ -643,10 +647,11 @@ 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); -- cgit v1.2.3-18-g5258