ACPI: EC: fix dmesg spam regression

Return OBF_1 optimization workaround

http://bugzilla.kernel.org/show_bug.cgi?id=8459

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 97dc16155a55..8917d754020e 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -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);
@@ -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");