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Commit 7c6db5e5 authored by Denis M. Sadykov's avatar Denis M. Sadykov Committed by Len Brown
Browse files

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: default avatarAlexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent d7a76e4c

drivers/acpi/ec.c

+50 −53
Original line number Diff line number Diff line
@@ -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,

	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)

	if (time_left <= 0) {

		if (acpi_ec_check_status(acpi_ec_read_status(ec), event)) {

				return 0;

		break;



	case ACPI_EC_EVENT_IBE:

		if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)

		}

	} else {

		return 0;

		break;

	}



	return -ETIME;
@@ -333,20 +330,20 @@ static int acpi_ec_transaction_unlocked(union acpi_ec *ec, u8 command, 


	acpi_hw_low_level_write(8, command, &ec->common.command_addr);



	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);

        }



	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;