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author | Alexey Starikovskiy <astarikovskiy@suse.de> | 2007-10-22 14:18:43 +0400 |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2007-10-25 16:31:31 -0400 |
commit | 7843932ac42899b936085beaea8620d4489b8b3f (patch) | |
tree | 6a3edbf8fc9d14c29c635f6759ca960088ee226f /drivers/acpi/ec.c | |
parent | 0c5d31f48e54b2e56e9cef8d49ffedaef1e0ea52 (diff) | |
download | kernel_samsung_smdk4412-7843932ac42899b936085beaea8620d4489b8b3f.zip kernel_samsung_smdk4412-7843932ac42899b936085beaea8620d4489b8b3f.tar.gz kernel_samsung_smdk4412-7843932ac42899b936085beaea8620d4489b8b3f.tar.bz2 |
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>
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r-- | drivers/acpi/ec.c | 51 |
1 files changed, 16 insertions, 35 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 5ce90ce..50d55fe 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -71,14 +71,10 @@ enum ec_event { #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ -static enum ec_mode { - EC_INTR = 1, /* Output buffer full */ - EC_POLL, /* Input buffer empty */ -} acpi_ec_mode = EC_INTR; - enum { EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ EC_FLAGS_QUERY_PENDING, /* Query is pending */ + EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */ }; static int acpi_ec_remove(struct acpi_device *device, int type); @@ -169,21 +165,23 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event) static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) { - if (unlikely(force_poll) || acpi_ec_mode == EC_POLL) { - unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); - clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); - while (time_before(jiffies, delay)) { - if (acpi_ec_check_status(ec, event)) - return 0; - } - } else { + if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) && + likely(!force_poll)) { if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event), msecs_to_jiffies(ACPI_EC_DELAY))) return 0; clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); if (acpi_ec_check_status(ec, event)) { + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); return 0; } + } else { + unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); + clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); + while (time_before(jiffies, delay)) { + if (acpi_ec_check_status(ec, event)) + return 0; + } } printk(KERN_ERR PREFIX "acpi_ec_wait timeout," " status = %d, expect_event = %d\n", @@ -481,18 +479,17 @@ static u32 acpi_ec_gpe_handler(void *data) struct acpi_ec *ec = data; clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags); - - if (acpi_ec_mode == EC_INTR) { + if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) wake_up(&ec->wait); - } if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) { if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); - } + } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) + set_bit(EC_FLAGS_GPE_MODE, &ec->flags); - return status == AE_OK ? + return ACPI_SUCCESS(status) ? ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; } @@ -923,20 +920,4 @@ static void __exit acpi_ec_exit(void) return; } -#endif /* 0 */ - -static int __init acpi_ec_set_intr_mode(char *str) -{ - int intr; - - if (!get_option(&str, &intr)) - return 0; - - acpi_ec_mode = (intr) ? EC_INTR : EC_POLL; - - printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling"); - - return 1; -} - -__setup("ec_intr=", acpi_ec_set_intr_mode); +#endif /* 0 */ |