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ACPI: EC: Remove unnecessary delay added by previous transation patch.

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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>
This commit is contained in:
Denis M. Sadykov 2006-09-26 19:50:33 +04:00 committed by Len Brown
parent d7a76e4cb3
commit 7c6db5e512
1 changed files with 50 additions and 53 deletions
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103
drivers/acpi/ec.c
View file

@ -100,7 +100,7 @@ union acpi_ec {
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 @@ union acpi_ec {
};
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 @@ static u32 acpi_ec_read_status(union acpi_ec *ec)
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 @@ static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event)
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 @@ int acpi_ec_leave_burst_mode(union acpi_ec *ec)
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 @@ static int acpi_ec_transaction_unlocked(union acpi_ec *ec, u8 command,
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,