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ACPI: EC: auto select interrupt mode
Start in POLL mode, and if we receive confirmation GPE, switch to INT mode. If confirmations are not sent, switch back to POLL. Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -586,11 +586,6 @@ and is between 256 and 4096 characters. It is defined in the file
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eata= [HW,SCSI]
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ec_intr= [HW,ACPI] ACPI Embedded Controller interrupt mode
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Format: <int>
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0: polling mode
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non-0: interrupt mode (default)
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edd= [EDD]
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Format: {"of[f]" | "sk[ipmbr]"}
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See comment in arch/i386/boot/edd.S
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@ -71,14 +71,10 @@ enum ec_event {
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#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
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#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
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static enum ec_mode {
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EC_INTR = 1, /* Output buffer full */
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EC_POLL, /* Input buffer empty */
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} acpi_ec_mode = EC_INTR;
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enum {
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EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */
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EC_FLAGS_QUERY_PENDING, /* Query is pending */
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EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */
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};
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static int acpi_ec_remove(struct acpi_device *device, int type);
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@ -169,21 +165,23 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
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static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
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{
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if (unlikely(force_poll) || acpi_ec_mode == EC_POLL) {
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unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
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clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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while (time_before(jiffies, delay)) {
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if (acpi_ec_check_status(ec, event))
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return 0;
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}
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} else {
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if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) &&
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likely(!force_poll)) {
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if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event),
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msecs_to_jiffies(ACPI_EC_DELAY)))
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return 0;
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clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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if (acpi_ec_check_status(ec, event)) {
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clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
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return 0;
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}
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} else {
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unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
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clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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while (time_before(jiffies, delay)) {
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if (acpi_ec_check_status(ec, event))
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return 0;
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}
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}
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printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
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" status = %d, expect_event = %d\n",
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@ -481,18 +479,17 @@ static u32 acpi_ec_gpe_handler(void *data)
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struct acpi_ec *ec = data;
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clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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if (acpi_ec_mode == EC_INTR) {
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if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
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wake_up(&ec->wait);
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}
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if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) {
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if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
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status = acpi_os_execute(OSL_EC_BURST_HANDLER,
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acpi_ec_gpe_query, ec);
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}
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} else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags)))
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set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
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return status == AE_OK ?
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return ACPI_SUCCESS(status) ?
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ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
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}
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@ -923,20 +920,4 @@ static void __exit acpi_ec_exit(void)
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return;
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}
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#endif /* 0 */
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static int __init acpi_ec_set_intr_mode(char *str)
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{
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int intr;
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if (!get_option(&str, &intr))
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return 0;
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acpi_ec_mode = (intr) ? EC_INTR : EC_POLL;
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printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling");
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return 1;
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}
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__setup("ec_intr=", acpi_ec_set_intr_mode);
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#endif /* 0 */
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