Revert "ACPI: EC: Workaround for optimized controllers"

This reverts commit f2d68935ba08cf80f151bbdb5628381184e4a498.

drivers/acpi/ec.c

@@ -75,8 +75,7 @@ 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_NO_ADDRESS_GPE,	/* Expect GPE only for non-address event */
-	EC_FLAGS_ADDRESS,		/* Address is being written */
+	EC_FLAGS_ONLY_IBF_GPE,		/* Expect GPE only for IBF = 0 event */
 };
 
 static int acpi_ec_remove(struct acpi_device *device, int type);
@@ -167,45 +166,38 @@ 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)))
-			goto end;
+			return 0;
 		clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
 		if (acpi_ec_check_status(ec, event)) {
-			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);
+			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 {
 				/* missing GPEs, switch back to poll mode */
-				printk(KERN_INFO PREFIX "missing confirmations,"
+				printk(KERN_INFO PREFIX "missing IBF_1 confirmations,"
 					"switch off interrupt mode.\n");
 				clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
 			}
-			goto end;
+			return 0;
 		}
 	} 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))
-				goto end;
+				return 0;
 		}
 	}
 	printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
 			       " status = %d, expect_event = %d\n",
 			       acpi_ec_read_status(ec), event);
-	ret = -ETIME;
-      end:
-	clear_bit(EC_FLAGS_ADDRESS, &ec->flags);
-	return ret;
+	return -ETIME;
 }
 
 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
@@ -224,9 +216,6 @@ 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++));
 	}
@@ -242,6 +231,8 @@ 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",