Pull bugzilla-8459 into release branch

drivers/acpi/ec.c

@@ -26,6 +26,9 @@
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */
 
+/* Uncomment next line to get verbose print outs*/
+/* #define DEBUG */
+
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -47,9 +50,6 @@
 #undef PREFIX
 #define PREFIX				"ACPI: EC: "
 
-/* Uncomment next line to get verbose print outs*/
-/* #define DEBUG */
-
 /* EC status register */
 #define ACPI_EC_FLAG_OBF	0x01	/* Output buffer full */
 #define ACPI_EC_FLAG_IBF	0x02	/* Input buffer full */
@@ -82,6 +82,7 @@ enum {
 	EC_FLAGS_ADDRESS,		/* Address is being written */
 	EC_FLAGS_NO_WDATA_GPE,		/* Don't expect WDATA GPE event */
 	EC_FLAGS_WDATA,			/* Data is being written */
+	EC_FLAGS_NO_OBF1_GPE,		/* Don't expect GPE before read */
 };
 
 static int acpi_ec_remove(struct acpi_device *device, int type);
@@ -138,26 +139,26 @@ static struct acpi_ec {
 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
 {
 	u8 x = inb(ec->command_addr);
-	pr_debug(PREFIX "---> status = 0x%2x\n", x);
+	pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
 	return x;
 }
 
 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
 {
 	u8 x = inb(ec->data_addr);
-	pr_debug(PREFIX "---> data = 0x%2x\n", x);
+	pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
 	return inb(ec->data_addr);
 }
 
 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
 {
-	pr_debug(PREFIX "<--- command = 0x%2x\n", command);
+	pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
 	outb(command, ec->command_addr);
 }
 
 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
 {
-	pr_debug(PREFIX "<--- data = 0x%2x\n", data);
+	pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
 	outb(data, ec->data_addr);
 }
 
@@ -179,6 +180,10 @@ 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(event == ACPI_EC_EVENT_OBF_1 &&
+		     test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags)))
+		force_poll = 1;
 	if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) &&
 		     test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags)))
 		force_poll = 1;
@@ -192,7 +197,12 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
 			goto end;
 		clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
 		if (acpi_ec_check_status(ec, event)) {
-			if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) {
+			if (event == ACPI_EC_EVENT_OBF_1) {
+				/* miss OBF_1 GPE, don't expect it */
+				pr_info(PREFIX "missing OBF confirmation, "
+					"don't expect it any longer.\n");
+				set_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags);
+			} else if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) {
 				/* miss address GPE, don't expect it anymore */
 				pr_info(PREFIX "missing address confirmation, "
 					"don't expect it any longer.\n");