ACPI: EC: Remove unnecessary delay added by previous transation patch.
Remove unnecessary delay (50 ms) while reading data from EC in interrupt mode.
Signed-off-by: Alexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index a0dcbad..b6f935d 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -100,7 +100,7 @@
struct acpi_generic_address command_addr;
struct acpi_generic_address data_addr;
unsigned long global_lock;
- unsigned int expect_event;
+ u8 expect_event;
atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
atomic_t pending_gpe;
struct semaphore sem;
@@ -121,7 +121,7 @@
};
static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event);
-static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event);
+static int acpi_ec_intr_wait(union acpi_ec *ec, u8 event);
static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command,
const u8 *wdata, unsigned wdata_len,
u8 *rdata, unsigned rdata_len);
@@ -161,6 +161,22 @@
return status;
}
+static int acpi_ec_check_status(u32 status, u8 event) {
+
+ switch (event) {
+ case ACPI_EC_EVENT_OBF:
+ if (status & ACPI_EC_FLAG_OBF)
+ return 1;
+ case ACPI_EC_EVENT_IBE:
+ if (!(status & ACPI_EC_FLAG_IBF))
+ return 1;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
static int acpi_ec_wait(union acpi_ec *ec, u8 event)
{
if (acpi_ec_poll_mode)
@@ -203,47 +219,28 @@
return -ETIME;
}
-static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event)
-{
- int result = 0;
+static int acpi_ec_intr_wait(union acpi_ec *ec, u8 event)
+{
+ long time_left;
ec->intr.expect_event = event;
- smp_mb();
- switch (event) {
- case ACPI_EC_EVENT_IBE:
- if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) {
+ if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) {
ec->intr.expect_event = 0;
return 0;
- }
- break;
- default:
- break;
}
- result = wait_event_timeout(ec->intr.wait,
- !ec->intr.expect_event,
- msecs_to_jiffies(ACPI_EC_DELAY));
+ time_left = wait_event_timeout(ec->intr.wait, !ec->intr.expect_event,
+ msecs_to_jiffies(ACPI_EC_DELAY));
ec->intr.expect_event = 0;
- smp_mb();
-
- /*
- * Verify that the event in question has actually happened by
- * querying EC status. Do the check even if operation timed-out
- * to make sure that we did not miss interrupt.
- */
- switch (event) {
- case ACPI_EC_EVENT_OBF:
- if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
- return 0;
- break;
-
- case ACPI_EC_EVENT_IBE:
- if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
- return 0;
- break;
+ if (time_left <= 0) {
+ if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) {
+ return 0;
+ }
+ } else {
+ return 0;
}
return -ETIME;
@@ -293,7 +290,7 @@
goto end;
acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
- }
+ }
atomic_set(&ec->intr.leaving_burst, 1);
return 0;
end:
@@ -333,32 +330,32 @@
acpi_hw_low_level_write(8, command, &ec->common.command_addr);
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
- if (result)
- return result;
+ for (; wdata_len > 0; wdata_len --) {
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+ if (result)
+ return result;
- for (; wdata_len > 0; wdata_len --) {
-
- acpi_hw_low_level_write(8, *(wdata++), &ec->common.data_addr);
-
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
- if (result)
- return result;
+ acpi_hw_low_level_write(8, *(wdata++), &ec->common.data_addr);
}
+ if (command == ACPI_EC_COMMAND_WRITE) {
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+ if (result)
+ return result;
+ }
- for (; rdata_len > 0; rdata_len --) {
- u32 d;
+ for (; rdata_len > 0; rdata_len --) {
+ u32 d;
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
- if (result)
- return result;
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
+ if (result)
+ return result;
- acpi_hw_low_level_read(8, &d, &ec->common.data_addr);
- *(rdata++) = (u8) d;
- }
+ acpi_hw_low_level_read(8, &d, &ec->common.data_addr);
+ *(rdata++) = (u8) d;
+ }
- return 0;
+ return 0;
}
static int acpi_ec_poll_transaction(union acpi_ec *ec, u8 command,