ACPI: EC: Output changes to operational mode

Insert printk() for every change in operational mode.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 202db575d5db96f3913fcc201e5c79986b7d9c35..bf60b24ebf54d3d0a5167c6e85b969e548e814d7 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -173,12 +173,17 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
                        return 0;
                clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
                if (acpi_ec_check_status(ec, event)) {
-                       if (event == ACPI_EC_EVENT_OBF_1)
+                       if (event == ACPI_EC_EVENT_OBF_1) {
                                /* miss OBF = 1 GPE, don't expect it anymore */
+                               printk(KERN_INFO PREFIX "missing OBF_1 confirmation,"
+                                       "switching to degraded mode.\n");
                                set_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags);
-                       else
+                       } else {
                                /* missing GPEs, switch back to poll mode */
+                               printk(KERN_INFO PREFIX "missing IBF_1 confirmations,"
+                                       "switch off interrupt mode.\n");
                                clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
+                       }
                        return 0;
                }
        } else {
@@ -491,8 +496,12 @@ static u32 acpi_ec_gpe_handler(void *data)
                if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
                        status = acpi_os_execute(OSL_EC_BURST_HANDLER,
                                acpi_ec_gpe_query, ec);
-       } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags)))
+       } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) {
+               /* this is non-query, must be confirmation */
+               printk(KERN_INFO PREFIX "non-query interrupt received,"
+                       " switching to interrupt mode\n");
                set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
+       }
 
        return ACPI_SUCCESS(status) ?
            ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
@@ -740,6 +749,8 @@ static int acpi_ec_add(struct acpi_device *device)
        acpi_ec_add_fs(device);
        printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
                          ec->gpe, ec->command_addr, ec->data_addr);
+       printk(KERN_INFO PREFIX "driver started in %s mode\n",
+               (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
        return 0;
 }