ACPI / EC: Fix regression due to conflicting firmware behavior between Samsung and...

[pandora-kernel.git] / drivers / acpi / ec.c

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 05df096..30229af 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -129,6 +129,7 @@ static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
 static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
 static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */
 static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
+static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */
 
 /* --------------------------------------------------------------------------
                              Transaction Management
@@ -206,13 +207,8 @@ static bool advance_transaction(struct acpi_ec *ec)
                }
                return wakeup;
        } else {
-               /*
-                * There is firmware refusing to respond QR_EC when SCI_EVT
-                * is not set, for which case, we complete the QR_EC
-                * without issuing it to the firmware.
-                * https://bugzilla.kernel.org/show_bug.cgi?id=86211
-                */
-               if (!(status & ACPI_EC_FLAG_SCI) &&
+               if (EC_FLAGS_QUERY_HANDSHAKE &&
+                   !(status & ACPI_EC_FLAG_SCI) &&
                    (t->command == ACPI_EC_COMMAND_QUERY)) {
                        t->flags |= ACPI_EC_COMMAND_POLL;
                        t->rdata[t->ri++] = 0x00;
@@ -986,6 +982,18 @@ static int ec_enlarge_storm_threshold(const struct dmi_system_id *id)
        return 0;
 }
 
+/*
+ * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for
+ * which case, we complete the QR_EC without issuing it to the firmware.
+ * https://bugzilla.kernel.org/show_bug.cgi?id=86211
+ */
+static int ec_flag_query_handshake(const struct dmi_system_id *id)
+{
+       pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n");
+       EC_FLAGS_QUERY_HANDSHAKE = 1;
+       return 0;
+}
+
 /*
  * On some hardware it is necessary to clear events accumulated by the EC during
  * sleep. These ECs stop reporting GPEs until they are manually polled, if too
@@ -1052,6 +1060,9 @@ static struct dmi_system_id __initdata ec_dmi_table[] = {
        {
        ec_clear_on_resume, "Samsung hardware", {
        DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL},
+       {
+       ec_flag_query_handshake, "Acer hardware", {
+       DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL},
        {},
 };