1 files changed, 30 insertions, 13 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 06b78e5e33a1..d6ddb547f2d9 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -75,7 +75,8 @@ enum {
 	EC_FLAGS_WAIT_GPE = 0,		/* Don't check status until GPE arrives */
 	EC_FLAGS_QUERY_PENDING,		/* Query is pending */
 	EC_FLAGS_GPE_MODE,		/* Expect GPE to be sent for status change */
-	EC_FLAGS_ONLY_IBF_GPE,		/* Expect GPE only for IBF = 0 event */
+	EC_FLAGS_NO_ADDRESS_GPE,	/* Expect GPE only for non-address event */
+	EC_FLAGS_ADDRESS,		/* Address is being written */
 };
 
 static int acpi_ec_remove(struct acpi_device *device, int type);
@@ -166,38 +167,45 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
 
 static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
 {
+	int ret = 0;
+	if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) &&
+		     test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags)))
+		force_poll = 1;
 	if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) &&
 	    likely(!force_poll)) {
 		if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event),
 				       msecs_to_jiffies(ACPI_EC_DELAY)))
-			return 0;
+			goto end;
 		clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
 		if (acpi_ec_check_status(ec, event)) {
-			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);
+			if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) {
+				/* miss address GPE, don't expect it anymore */
+				printk(KERN_INFO PREFIX "missing address confirmation,"
+					"don't expect it any longer.\n");
+				set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags);
 			} else {
 				/* missing GPEs, switch back to poll mode */
-				printk(KERN_INFO PREFIX "missing IBF_1 confirmations,"
+				printk(KERN_INFO PREFIX "missing confirmations,"
 					"switch off interrupt mode.\n");
 				clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
 			}
-			return 0;
+			goto end;
 		}
 	} else {
 		unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
 		clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
 		while (time_before(jiffies, delay)) {
 			if (acpi_ec_check_status(ec, event))
-				return 0;
+				goto end;
 		}
 	}
 	printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
 			       " status = %d, expect_event = %d\n",
 			       acpi_ec_read_status(ec), event);
-	return -ETIME;
+	ret = -ETIME;
+      end:
+	clear_bit(EC_FLAGS_ADDRESS, &ec->flags);
+	return ret;
 }
 
 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
@@ -216,6 +224,9 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
 			       "write_cmd timeout, command = %d\n", command);
 			goto end;
 		}
+		/* mark the address byte written to EC */
+		if (rdata_len + wdata_len > 1)
+			set_bit(EC_FLAGS_ADDRESS, &ec->flags);
 		set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
 		acpi_ec_write_data(ec, *(wdata++));
 	}
@@ -231,8 +242,6 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
 		clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
 
 	for (; rdata_len > 0; --rdata_len) {
-		if (test_bit(EC_FLAGS_ONLY_IBF_GPE, &ec->flags))
-			force_poll = 1;
 		result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
 		if (result) {
 			printk(KERN_ERR PREFIX "read timeout, command = %d\n",
@@ -881,12 +890,20 @@ int __init acpi_ec_ecdt_probe(void)
 		boot_ec->gpe = ecdt_ptr->gpe;
 		boot_ec->handle = ACPI_ROOT_OBJECT;
 	} else {
+		/* This workaround is needed only on some broken machines,
+		 * which require early EC, but fail to provide ECDT */
+		acpi_handle x;
 		printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
 		status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
 						boot_ec, NULL);
 		/* Check that acpi_get_devices actually find something */
 		if (ACPI_FAILURE(status) || !boot_ec->handle)
 			goto error;
+		/* We really need to limit this workaround, the only ASUS,
+		 * which needs it, has fake EC._INI method, so use it as flag.
+		 */
+		if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
+			goto error;
 	}
 
 	ret = ec_install_handlers(boot_ec);